./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 826ab2ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 05:39:12,625 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 05:39:12,716 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 05:39:12,725 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 05:39:12,726 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 05:39:12,759 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 05:39:12,760 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 05:39:12,760 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 05:39:12,761 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 05:39:12,761 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 05:39:12,761 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 05:39:12,762 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 05:39:12,762 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 05:39:12,762 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 05:39:12,762 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 05:39:12,763 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 05:39:12,763 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 05:39:12,763 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 05:39:12,764 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 05:39:12,764 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 05:39:12,765 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 05:39:12,765 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E 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 ! call(reach_error())) ) 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 -> d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d [2024-11-14 05:39:13,084 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 05:39:13,096 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 05:39:13,099 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 05:39:13,101 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 05:39:13,102 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 05:39:13,103 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c Unable to find full path for "g++" [2024-11-14 05:39:15,026 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 05:39:15,239 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 05:39:15,240 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c [2024-11-14 05:39:15,247 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/data/6b6c50a21/1579319597c94145a7804f75049575e8/FLAG678f29255 [2024-11-14 05:39:15,261 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/data/6b6c50a21/1579319597c94145a7804f75049575e8 [2024-11-14 05:39:15,264 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 05:39:15,265 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 05:39:15,266 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 05:39:15,267 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 05:39:15,270 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 05:39:15,271 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,271 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7064913 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15, skipping insertion in model container [2024-11-14 05:39:15,272 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,285 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 05:39:15,434 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2024-11-14 05:39:15,437 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 05:39:15,446 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 05:39:15,460 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2024-11-14 05:39:15,460 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 05:39:15,472 INFO L204 MainTranslator]: Completed translation [2024-11-14 05:39:15,472 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15 WrapperNode [2024-11-14 05:39:15,472 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 05:39:15,473 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 05:39:15,473 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 05:39:15,473 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 05:39:15,479 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,485 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,499 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 20 [2024-11-14 05:39:15,499 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 05:39:15,500 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 05:39:15,500 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 05:39:15,500 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 05:39:15,506 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,507 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,507 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,508 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,510 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,512 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,513 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,513 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,514 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 05:39:15,515 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 05:39:15,515 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 05:39:15,515 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 05:39:15,516 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (1/1) ... [2024-11-14 05:39:15,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 05:39:15,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:15,548 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 05:39:15,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 05:39:15,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 05:39:15,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 05:39:15,581 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2024-11-14 05:39:15,581 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2024-11-14 05:39:15,582 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2024-11-14 05:39:15,582 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2024-11-14 05:39:15,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 05:39:15,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 05:39:15,655 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 05:39:15,657 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 05:39:15,817 INFO L? ?]: Removed 8 outVars from TransFormulas that were not future-live. [2024-11-14 05:39:15,817 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 05:39:15,838 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 05:39:15,838 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-14 05:39:15,838 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 05:39:15 BoogieIcfgContainer [2024-11-14 05:39:15,839 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 05:39:15,843 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 05:39:15,844 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 05:39:15,850 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 05:39:15,850 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 05:39:15" (1/3) ... [2024-11-14 05:39:15,851 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b195a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 05:39:15, skipping insertion in model container [2024-11-14 05:39:15,851 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 05:39:15" (2/3) ... [2024-11-14 05:39:15,852 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b195a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 05:39:15, skipping insertion in model container [2024-11-14 05:39:15,852 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 05:39:15" (3/3) ... [2024-11-14 05:39:15,854 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_15-2.c [2024-11-14 05:39:15,871 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 05:39:15,873 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG fibo_2calls_15-2.c that has 3 procedures, 26 locations, 1 initial locations, 0 loop locations, and 1 error locations. [2024-11-14 05:39:15,939 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 05:39:15,957 INFO L333 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, 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;@496d4953, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 05:39:15,957 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 05:39:15,961 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-14 05:39:15,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-14 05:39:15,969 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:15,970 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:15,970 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:15,976 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:15,978 INFO L85 PathProgramCache]: Analyzing trace with hash -389521846, now seen corresponding path program 1 times [2024-11-14 05:39:15,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:15,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085973419] [2024-11-14 05:39:15,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:15,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:16,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 05:39:16,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:16,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085973419] [2024-11-14 05:39:16,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085973419] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:39:16,196 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:39:16,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 05:39:16,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959351408] [2024-11-14 05:39:16,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:39:16,202 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:39:16,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:16,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:39:16,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:39:16,223 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:39:16,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:16,331 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2024-11-14 05:39:16,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:39:16,334 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2024-11-14 05:39:16,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:16,340 INFO L225 Difference]: With dead ends: 36 [2024-11-14 05:39:16,341 INFO L226 Difference]: Without dead ends: 28 [2024-11-14 05:39:16,343 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:39:16,346 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 9 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:16,347 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 80 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:39:16,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-14 05:39:16,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2024-11-14 05:39:16,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2024-11-14 05:39:16,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2024-11-14 05:39:16,383 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2024-11-14 05:39:16,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:16,384 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2024-11-14 05:39:16,384 INFO L472 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:39:16,384 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2024-11-14 05:39:16,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-14 05:39:16,386 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:16,386 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:16,386 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 05:39:16,386 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:16,387 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:16,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1524884472, now seen corresponding path program 1 times [2024-11-14 05:39:16,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:16,387 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329306629] [2024-11-14 05:39:16,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:16,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:16,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:16,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 05:39:16,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:16,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329306629] [2024-11-14 05:39:16,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329306629] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:39:16,460 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 05:39:16,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 05:39:16,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64430481] [2024-11-14 05:39:16,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:39:16,461 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 05:39:16,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:16,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 05:39:16,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:39:16,462 INFO L87 Difference]: Start difference. First operand 26 states and 33 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:39:16,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:16,558 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2024-11-14 05:39:16,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 05:39:16,559 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2024-11-14 05:39:16,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:16,560 INFO L225 Difference]: With dead ends: 32 [2024-11-14 05:39:16,560 INFO L226 Difference]: Without dead ends: 28 [2024-11-14 05:39:16,560 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 05:39:16,561 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:16,562 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:39:16,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-14 05:39:16,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2024-11-14 05:39:16,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2024-11-14 05:39:16,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2024-11-14 05:39:16,578 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2024-11-14 05:39:16,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:16,578 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2024-11-14 05:39:16,579 INFO L472 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-11-14 05:39:16,579 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2024-11-14 05:39:16,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2024-11-14 05:39:16,580 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:16,580 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:16,580 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 05:39:16,580 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:16,580 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:16,581 INFO L85 PathProgramCache]: Analyzing trace with hash 741502751, now seen corresponding path program 1 times [2024-11-14 05:39:16,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:16,582 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270978219] [2024-11-14 05:39:16,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:16,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:16,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:16,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-14 05:39:16,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:16,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270978219] [2024-11-14 05:39:16,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270978219] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:16,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024451580] [2024-11-14 05:39:16,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:16,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:16,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:16,797 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:16,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 05:39:16,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:16,883 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-11-14 05:39:16,890 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:17,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-14 05:39:17,029 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:17,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-14 05:39:17,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024451580] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:17,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1435219743] [2024-11-14 05:39:17,304 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-14 05:39:17,305 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:17,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 05:39:17,313 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 05:39:17,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 05:39:17,422 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 35 for LOIs [2024-11-14 05:39:17,498 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 35 for LOIs [2024-11-14 05:39:17,541 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 05:39:17,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1435219743] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:39:17,858 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:17,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2024-11-14 05:39:17,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493866456] [2024-11-14 05:39:17,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:39:17,860 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 05:39:17,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:17,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 05:39:17,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2024-11-14 05:39:17,862 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-14 05:39:18,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:18,008 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2024-11-14 05:39:18,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-14 05:39:18,009 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2024-11-14 05:39:18,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:18,011 INFO L225 Difference]: With dead ends: 68 [2024-11-14 05:39:18,011 INFO L226 Difference]: Without dead ends: 44 [2024-11-14 05:39:18,012 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2024-11-14 05:39:18,012 INFO L432 NwaCegarLoop]: 28 mSDtfsCounter, 16 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:18,014 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 101 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 05:39:18,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-14 05:39:18,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2024-11-14 05:39:18,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-11-14 05:39:18,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2024-11-14 05:39:18,033 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2024-11-14 05:39:18,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:18,033 INFO L471 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2024-11-14 05:39:18,034 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-14 05:39:18,034 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2024-11-14 05:39:18,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2024-11-14 05:39:18,037 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:18,037 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:18,058 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-14 05:39:18,238 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:18,238 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:18,238 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:18,238 INFO L85 PathProgramCache]: Analyzing trace with hash -1754399412, now seen corresponding path program 1 times [2024-11-14 05:39:18,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:18,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104116507] [2024-11-14 05:39:18,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:18,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:18,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:18,431 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 05:39:18,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:18,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104116507] [2024-11-14 05:39:18,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104116507] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:18,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970269749] [2024-11-14 05:39:18,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:18,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:18,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:18,435 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:18,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 05:39:18,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:18,498 INFO L255 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 05:39:18,500 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:18,617 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-11-14 05:39:18,619 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:19,074 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 05:39:19,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970269749] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:19,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808675296] [2024-11-14 05:39:19,079 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:19,080 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:19,082 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:19,087 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:19,087 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2024-11-14 05:39:19,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007219164] [2024-11-14 05:39:19,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:19,088 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 05:39:19,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:19,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 05:39:19,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2024-11-14 05:39:19,089 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2024-11-14 05:39:19,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:19,333 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2024-11-14 05:39:19,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-14 05:39:19,334 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2024-11-14 05:39:19,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:19,335 INFO L225 Difference]: With dead ends: 85 [2024-11-14 05:39:19,335 INFO L226 Difference]: Without dead ends: 53 [2024-11-14 05:39:19,336 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2024-11-14 05:39:19,337 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:19,337 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 140 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:39:19,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-14 05:39:19,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2024-11-14 05:39:19,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2024-11-14 05:39:19,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2024-11-14 05:39:19,357 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2024-11-14 05:39:19,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:19,357 INFO L471 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2024-11-14 05:39:19,357 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2024-11-14 05:39:19,357 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2024-11-14 05:39:19,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2024-11-14 05:39:19,358 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:19,358 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:19,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-14 05:39:19,562 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:19,564 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:19,565 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:19,565 INFO L85 PathProgramCache]: Analyzing trace with hash 2101254926, now seen corresponding path program 1 times [2024-11-14 05:39:19,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:19,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578227268] [2024-11-14 05:39:19,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:19,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:19,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:19,792 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 05:39:19,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:19,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578227268] [2024-11-14 05:39:19,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578227268] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:19,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509578264] [2024-11-14 05:39:19,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:19,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:19,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:19,796 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:19,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 05:39:19,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:19,858 INFO L255 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 05:39:19,860 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:19,976 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 05:39:19,977 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:20,397 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-14 05:39:20,398 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509578264] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:20,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051232429] [2024-11-14 05:39:20,400 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:20,400 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:20,401 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:20,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:20,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2024-11-14 05:39:20,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467709551] [2024-11-14 05:39:20,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:20,402 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-14 05:39:20,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:20,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-14 05:39:20,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2024-11-14 05:39:20,404 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2024-11-14 05:39:20,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:20,865 INFO L93 Difference]: Finished difference Result 123 states and 210 transitions. [2024-11-14 05:39:20,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 05:39:20,866 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2024-11-14 05:39:20,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:20,868 INFO L225 Difference]: With dead ends: 123 [2024-11-14 05:39:20,869 INFO L226 Difference]: Without dead ends: 79 [2024-11-14 05:39:20,870 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2024-11-14 05:39:20,874 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 43 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:20,875 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 225 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 05:39:20,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2024-11-14 05:39:20,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 63. [2024-11-14 05:39:20,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2024-11-14 05:39:20,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2024-11-14 05:39:20,901 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2024-11-14 05:39:20,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:20,904 INFO L471 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2024-11-14 05:39:20,904 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2024-11-14 05:39:20,904 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2024-11-14 05:39:20,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-14 05:39:20,908 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:20,908 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:20,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-14 05:39:21,109 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:21,109 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:21,109 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:21,109 INFO L85 PathProgramCache]: Analyzing trace with hash 644290867, now seen corresponding path program 1 times [2024-11-14 05:39:21,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:21,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251311048] [2024-11-14 05:39:21,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:21,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:21,249 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-14 05:39:21,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:21,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251311048] [2024-11-14 05:39:21,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251311048] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:21,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905192078] [2024-11-14 05:39:21,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:21,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:21,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:21,253 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:21,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 05:39:21,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:21,325 INFO L255 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-14 05:39:21,327 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:21,429 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-14 05:39:21,431 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:22,051 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 05:39:22,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905192078] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:22,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6932018] [2024-11-14 05:39:22,054 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:22,054 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:22,055 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:22,057 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:22,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2024-11-14 05:39:22,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873701681] [2024-11-14 05:39:22,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:22,058 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-14 05:39:22,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:22,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-14 05:39:22,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2024-11-14 05:39:22,059 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2024-11-14 05:39:22,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:22,332 INFO L93 Difference]: Finished difference Result 121 states and 210 transitions. [2024-11-14 05:39:22,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-14 05:39:22,333 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2024-11-14 05:39:22,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:22,335 INFO L225 Difference]: With dead ends: 121 [2024-11-14 05:39:22,335 INFO L226 Difference]: Without dead ends: 99 [2024-11-14 05:39:22,336 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2024-11-14 05:39:22,337 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:22,337 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 147 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:39:22,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2024-11-14 05:39:22,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 72. [2024-11-14 05:39:22,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2024-11-14 05:39:22,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2024-11-14 05:39:22,367 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2024-11-14 05:39:22,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:22,371 INFO L471 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2024-11-14 05:39:22,371 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2024-11-14 05:39:22,371 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2024-11-14 05:39:22,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2024-11-14 05:39:22,377 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:22,377 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:22,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-14 05:39:22,577 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-11-14 05:39:22,578 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:22,578 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:22,578 INFO L85 PathProgramCache]: Analyzing trace with hash -988387816, now seen corresponding path program 1 times [2024-11-14 05:39:22,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:22,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335155780] [2024-11-14 05:39:22,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:22,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:22,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:22,812 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 59 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2024-11-14 05:39:22,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:22,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335155780] [2024-11-14 05:39:22,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335155780] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:22,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104779041] [2024-11-14 05:39:22,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:22,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:22,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:22,814 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:22,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 05:39:22,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:22,892 INFO L255 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 05:39:22,894 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:23,060 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2024-11-14 05:39:23,060 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:24,076 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 102 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 05:39:24,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104779041] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:24,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563194670] [2024-11-14 05:39:24,078 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:24,081 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:24,081 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:24,083 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:24,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2024-11-14 05:39:24,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90237498] [2024-11-14 05:39:24,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:24,084 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-14 05:39:24,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:24,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-14 05:39:24,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2024-11-14 05:39:24,088 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2024-11-14 05:39:24,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:24,785 INFO L93 Difference]: Finished difference Result 206 states and 415 transitions. [2024-11-14 05:39:24,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 05:39:24,786 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) Word has length 92 [2024-11-14 05:39:24,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:24,789 INFO L225 Difference]: With dead ends: 206 [2024-11-14 05:39:24,789 INFO L226 Difference]: Without dead ends: 117 [2024-11-14 05:39:24,791 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 05:39:24,792 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 73 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:24,792 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 346 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 542 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:39:24,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2024-11-14 05:39:24,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 100. [2024-11-14 05:39:24,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (51), 23 states have call predecessors, (51), 19 states have call successors, (51) [2024-11-14 05:39:24,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 146 transitions. [2024-11-14 05:39:24,825 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 146 transitions. Word has length 92 [2024-11-14 05:39:24,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:24,825 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 146 transitions. [2024-11-14 05:39:24,825 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2024-11-14 05:39:24,825 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 146 transitions. [2024-11-14 05:39:24,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2024-11-14 05:39:24,837 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:24,837 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:24,856 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-14 05:39:25,037 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-14 05:39:25,038 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:25,038 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:25,038 INFO L85 PathProgramCache]: Analyzing trace with hash -280847514, now seen corresponding path program 2 times [2024-11-14 05:39:25,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:25,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372994829] [2024-11-14 05:39:25,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:25,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:25,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:25,208 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 39 proven. 116 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2024-11-14 05:39:25,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:25,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372994829] [2024-11-14 05:39:25,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372994829] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:25,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166995569] [2024-11-14 05:39:25,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:39:25,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:25,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:25,210 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:25,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 05:39:25,288 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-14 05:39:25,288 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:39:25,290 INFO L255 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-14 05:39:25,293 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:25,334 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2024-11-14 05:39:25,334 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 05:39:25,334 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166995569] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 05:39:25,334 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-14 05:39:25,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2024-11-14 05:39:25,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543861250] [2024-11-14 05:39:25,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 05:39:25,335 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-14 05:39:25,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:25,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-14 05:39:25,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:39:25,336 INFO L87 Difference]: Start difference. First operand 100 states and 146 transitions. Second operand has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2024-11-14 05:39:25,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:25,398 INFO L93 Difference]: Finished difference Result 190 states and 311 transitions. [2024-11-14 05:39:25,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 05:39:25,399 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 142 [2024-11-14 05:39:25,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:25,400 INFO L225 Difference]: With dead ends: 190 [2024-11-14 05:39:25,402 INFO L226 Difference]: Without dead ends: 100 [2024-11-14 05:39:25,403 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2024-11-14 05:39:25,403 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 8 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:25,403 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 99 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 05:39:25,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2024-11-14 05:39:25,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2024-11-14 05:39:25,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2024-11-14 05:39:25,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2024-11-14 05:39:25,429 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 142 [2024-11-14 05:39:25,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:25,430 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2024-11-14 05:39:25,434 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 6 states have internal predecessors, (32), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2024-11-14 05:39:25,434 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2024-11-14 05:39:25,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2024-11-14 05:39:25,438 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:25,439 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 11, 11, 11, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:25,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-14 05:39:25,639 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:25,639 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:25,640 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:25,640 INFO L85 PathProgramCache]: Analyzing trace with hash 175421652, now seen corresponding path program 3 times [2024-11-14 05:39:25,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:25,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479740536] [2024-11-14 05:39:25,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:25,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:25,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:25,987 INFO L134 CoverageAnalysis]: Checked inductivity of 791 backedges. 54 proven. 198 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2024-11-14 05:39:25,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:25,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479740536] [2024-11-14 05:39:25,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479740536] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:25,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301851002] [2024-11-14 05:39:25,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:39:25,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:25,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:25,990 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:25,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 05:39:26,091 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:39:26,092 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:39:26,093 INFO L255 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 05:39:26,096 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:26,192 INFO L134 CoverageAnalysis]: Checked inductivity of 791 backedges. 315 proven. 6 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2024-11-14 05:39:26,196 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 791 backedges. 69 proven. 184 refuted. 0 times theorem prover too weak. 538 trivial. 0 not checked. [2024-11-14 05:39:26,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301851002] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:26,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914803568] [2024-11-14 05:39:26,999 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:27,000 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:27,000 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java: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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:27,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:27,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2024-11-14 05:39:27,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160582284] [2024-11-14 05:39:27,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:27,002 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-14 05:39:27,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:27,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-14 05:39:27,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2024-11-14 05:39:27,003 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2024-11-14 05:39:27,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:27,547 INFO L93 Difference]: Finished difference Result 222 states and 343 transitions. [2024-11-14 05:39:27,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-14 05:39:27,548 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) Word has length 172 [2024-11-14 05:39:27,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:27,550 INFO L225 Difference]: With dead ends: 222 [2024-11-14 05:39:27,550 INFO L226 Difference]: Without dead ends: 132 [2024-11-14 05:39:27,552 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 335 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2024-11-14 05:39:27,552 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 74 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:27,552 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 237 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 05:39:27,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2024-11-14 05:39:27,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 95. [2024-11-14 05:39:27,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 62 states have (on average 1.1774193548387097) internal successors, (73), 64 states have internal predecessors, (73), 19 states have call successors, (19), 8 states have call predecessors, (19), 13 states have return successors, (43), 22 states have call predecessors, (43), 19 states have call successors, (43) [2024-11-14 05:39:27,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 135 transitions. [2024-11-14 05:39:27,570 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 135 transitions. Word has length 172 [2024-11-14 05:39:27,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:27,570 INFO L471 AbstractCegarLoop]: Abstraction has 95 states and 135 transitions. [2024-11-14 05:39:27,571 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2024-11-14 05:39:27,571 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 135 transitions. [2024-11-14 05:39:27,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2024-11-14 05:39:27,573 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:27,573 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 10, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:27,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-14 05:39:27,777 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:27,777 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:27,777 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:27,778 INFO L85 PathProgramCache]: Analyzing trace with hash -225787115, now seen corresponding path program 1 times [2024-11-14 05:39:27,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:27,778 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341010834] [2024-11-14 05:39:27,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:27,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:27,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:28,037 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 67 proven. 171 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2024-11-14 05:39:28,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:28,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341010834] [2024-11-14 05:39:28,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341010834] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:28,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962714273] [2024-11-14 05:39:28,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:28,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:28,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:28,039 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:28,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 05:39:28,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:28,154 INFO L255 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 05:39:28,166 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:28,355 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 30 proven. 250 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2024-11-14 05:39:28,355 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:29,904 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 30 proven. 266 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2024-11-14 05:39:29,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962714273] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:29,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1827901284] [2024-11-14 05:39:29,908 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:29,912 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:29,912 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:29,912 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:29,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 25 [2024-11-14 05:39:29,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840065596] [2024-11-14 05:39:29,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:29,913 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-14 05:39:29,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:29,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-14 05:39:29,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2024-11-14 05:39:29,915 INFO L87 Difference]: Start difference. First operand 95 states and 135 transitions. Second operand has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2024-11-14 05:39:30,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:30,638 INFO L93 Difference]: Finished difference Result 250 states and 437 transitions. [2024-11-14 05:39:30,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 05:39:30,639 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) Word has length 160 [2024-11-14 05:39:30,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:30,641 INFO L225 Difference]: With dead ends: 250 [2024-11-14 05:39:30,643 INFO L226 Difference]: Without dead ends: 135 [2024-11-14 05:39:30,645 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 300 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=321, Invalid=1571, Unknown=0, NotChecked=0, Total=1892 [2024-11-14 05:39:30,646 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 104 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:30,646 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 362 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:39:30,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2024-11-14 05:39:30,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 115. [2024-11-14 05:39:30,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 76 states have (on average 1.2105263157894737) internal successors, (92), 78 states have internal predecessors, (92), 23 states have call successors, (23), 11 states have call predecessors, (23), 15 states have return successors, (56), 25 states have call predecessors, (56), 23 states have call successors, (56) [2024-11-14 05:39:30,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 171 transitions. [2024-11-14 05:39:30,681 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 171 transitions. Word has length 160 [2024-11-14 05:39:30,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:30,681 INFO L471 AbstractCegarLoop]: Abstraction has 115 states and 171 transitions. [2024-11-14 05:39:30,681 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2024-11-14 05:39:30,681 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 171 transitions. [2024-11-14 05:39:30,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2024-11-14 05:39:30,689 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:30,689 INFO L215 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 15, 14, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 5, 5, 3, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:30,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-14 05:39:30,889 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-14 05:39:30,890 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:30,890 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:30,890 INFO L85 PathProgramCache]: Analyzing trace with hash -1601843718, now seen corresponding path program 4 times [2024-11-14 05:39:30,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:30,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392121228] [2024-11-14 05:39:30,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:30,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:30,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:31,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 138 proven. 287 refuted. 0 times theorem prover too weak. 1355 trivial. 0 not checked. [2024-11-14 05:39:31,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:31,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392121228] [2024-11-14 05:39:31,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392121228] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:31,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970602703] [2024-11-14 05:39:31,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:39:31,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:31,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:31,368 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:31,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 05:39:31,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:31,530 INFO L255 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 05:39:31,534 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:31,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 89 proven. 482 refuted. 0 times theorem prover too weak. 1209 trivial. 0 not checked. [2024-11-14 05:39:31,678 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:33,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 89 proven. 506 refuted. 0 times theorem prover too weak. 1185 trivial. 0 not checked. [2024-11-14 05:39:33,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970602703] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:33,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1863425444] [2024-11-14 05:39:33,839 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:33,840 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:33,840 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:33,840 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:33,840 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 17] total 23 [2024-11-14 05:39:33,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124065337] [2024-11-14 05:39:33,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:33,841 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-14 05:39:33,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:33,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-14 05:39:33,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2024-11-14 05:39:33,843 INFO L87 Difference]: Start difference. First operand 115 states and 171 transitions. Second operand has 23 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 23 states have internal predecessors, (77), 19 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2024-11-14 05:39:34,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:34,204 INFO L93 Difference]: Finished difference Result 165 states and 290 transitions. [2024-11-14 05:39:34,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 05:39:34,204 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 23 states have internal predecessors, (77), 19 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) Word has length 254 [2024-11-14 05:39:34,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:34,210 INFO L225 Difference]: With dead ends: 165 [2024-11-14 05:39:34,210 INFO L226 Difference]: Without dead ends: 141 [2024-11-14 05:39:34,211 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 491 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2024-11-14 05:39:34,212 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 57 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:34,213 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 157 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:39:34,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2024-11-14 05:39:34,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 126. [2024-11-14 05:39:34,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 83 states have (on average 1.1927710843373494) internal successors, (99), 85 states have internal predecessors, (99), 24 states have call successors, (24), 11 states have call predecessors, (24), 18 states have return successors, (65), 29 states have call predecessors, (65), 24 states have call successors, (65) [2024-11-14 05:39:34,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 188 transitions. [2024-11-14 05:39:34,240 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 188 transitions. Word has length 254 [2024-11-14 05:39:34,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:34,240 INFO L471 AbstractCegarLoop]: Abstraction has 126 states and 188 transitions. [2024-11-14 05:39:34,240 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 23 states have internal predecessors, (77), 19 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2024-11-14 05:39:34,241 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 188 transitions. [2024-11-14 05:39:34,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 717 [2024-11-14 05:39:34,258 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:34,258 INFO L215 NwaCegarLoop]: trace histogram [54, 54, 51, 51, 42, 41, 27, 27, 27, 27, 27, 27, 27, 25, 25, 25, 25, 25, 25, 25, 17, 14, 12, 10, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:34,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-14 05:39:34,462 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-14 05:39:34,462 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:34,463 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:34,463 INFO L85 PathProgramCache]: Analyzing trace with hash -529100490, now seen corresponding path program 5 times [2024-11-14 05:39:34,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:34,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468927457] [2024-11-14 05:39:34,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:34,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:34,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:35,972 INFO L134 CoverageAnalysis]: Checked inductivity of 15109 backedges. 273 proven. 1874 refuted. 0 times theorem prover too weak. 12962 trivial. 0 not checked. [2024-11-14 05:39:35,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:35,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468927457] [2024-11-14 05:39:35,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468927457] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:35,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064038605] [2024-11-14 05:39:35,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:39:35,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:35,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:35,975 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:35,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 05:39:36,159 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 05:39:36,159 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:39:36,161 INFO L255 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 05:39:36,175 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:36,351 INFO L134 CoverageAnalysis]: Checked inductivity of 15109 backedges. 2505 proven. 34 refuted. 0 times theorem prover too weak. 12570 trivial. 0 not checked. [2024-11-14 05:39:36,351 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:39,110 INFO L134 CoverageAnalysis]: Checked inductivity of 15109 backedges. 1749 proven. 73 refuted. 0 times theorem prover too weak. 13287 trivial. 0 not checked. [2024-11-14 05:39:39,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064038605] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:39,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1073664583] [2024-11-14 05:39:39,113 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:39,113 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:39,113 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:39,114 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:39,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2024-11-14 05:39:39,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727715653] [2024-11-14 05:39:39,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:39,116 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-14 05:39:39,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:39,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-14 05:39:39,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2024-11-14 05:39:39,117 INFO L87 Difference]: Start difference. First operand 126 states and 188 transitions. Second operand has 24 states, 23 states have (on average 4.086956521739131) internal successors, (94), 24 states have internal predecessors, (94), 19 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (37), 14 states have call predecessors, (37), 19 states have call successors, (37) [2024-11-14 05:39:40,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:40,114 INFO L93 Difference]: Finished difference Result 310 states and 567 transitions. [2024-11-14 05:39:40,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-14 05:39:40,115 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.086956521739131) internal successors, (94), 24 states have internal predecessors, (94), 19 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (37), 14 states have call predecessors, (37), 19 states have call successors, (37) Word has length 716 [2024-11-14 05:39:40,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:40,118 INFO L225 Difference]: With dead ends: 310 [2024-11-14 05:39:40,122 INFO L226 Difference]: Without dead ends: 182 [2024-11-14 05:39:40,124 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1476 GetRequests, 1421 SyntacticMatches, 6 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=395, Invalid=2155, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 05:39:40,124 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 130 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:40,125 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 260 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 05:39:40,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2024-11-14 05:39:40,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 155. [2024-11-14 05:39:40,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 104 states have (on average 1.1730769230769231) internal successors, (122), 105 states have internal predecessors, (122), 31 states have call successors, (31), 17 states have call predecessors, (31), 19 states have return successors, (96), 32 states have call predecessors, (96), 31 states have call successors, (96) [2024-11-14 05:39:40,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 249 transitions. [2024-11-14 05:39:40,166 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 249 transitions. Word has length 716 [2024-11-14 05:39:40,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:40,167 INFO L471 AbstractCegarLoop]: Abstraction has 155 states and 249 transitions. [2024-11-14 05:39:40,167 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.086956521739131) internal successors, (94), 24 states have internal predecessors, (94), 19 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (37), 14 states have call predecessors, (37), 19 states have call successors, (37) [2024-11-14 05:39:40,168 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 249 transitions. [2024-11-14 05:39:40,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 732 [2024-11-14 05:39:40,190 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:40,191 INFO L215 NwaCegarLoop]: trace histogram [57, 57, 50, 50, 43, 43, 28, 28, 28, 28, 28, 28, 28, 25, 25, 25, 25, 25, 25, 25, 18, 15, 14, 7, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:40,211 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-14 05:39:40,395 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-14 05:39:40,395 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:40,395 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:40,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1703630143, now seen corresponding path program 6 times [2024-11-14 05:39:40,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:40,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722118590] [2024-11-14 05:39:40,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:40,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:40,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:41,746 INFO L134 CoverageAnalysis]: Checked inductivity of 15802 backedges. 389 proven. 1546 refuted. 0 times theorem prover too weak. 13867 trivial. 0 not checked. [2024-11-14 05:39:41,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:41,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722118590] [2024-11-14 05:39:41,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722118590] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:41,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836540142] [2024-11-14 05:39:41,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:39:41,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:41,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:41,753 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:41,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 05:39:42,080 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:39:42,080 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:39:42,085 INFO L255 TraceCheckSpWp]: Trace formula consists of 1300 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 05:39:42,097 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:42,269 INFO L134 CoverageAnalysis]: Checked inductivity of 15802 backedges. 3872 proven. 68 refuted. 0 times theorem prover too weak. 11862 trivial. 0 not checked. [2024-11-14 05:39:42,269 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:45,509 INFO L134 CoverageAnalysis]: Checked inductivity of 15802 backedges. 437 proven. 1961 refuted. 0 times theorem prover too weak. 13404 trivial. 0 not checked. [2024-11-14 05:39:45,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836540142] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:45,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200024201] [2024-11-14 05:39:45,511 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:45,512 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:45,513 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:45,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:45,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 25 [2024-11-14 05:39:45,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944846067] [2024-11-14 05:39:45,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:45,518 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-14 05:39:45,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:45,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-14 05:39:45,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2024-11-14 05:39:45,520 INFO L87 Difference]: Start difference. First operand 155 states and 249 transitions. Second operand has 25 states, 24 states have (on average 4.125) internal successors, (99), 25 states have internal predecessors, (99), 20 states have call successors, (30), 2 states have call predecessors, (30), 13 states have return successors, (38), 13 states have call predecessors, (38), 20 states have call successors, (38) [2024-11-14 05:39:46,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:46,438 INFO L93 Difference]: Finished difference Result 353 states and 669 transitions. [2024-11-14 05:39:46,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-14 05:39:46,441 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.125) internal successors, (99), 25 states have internal predecessors, (99), 20 states have call successors, (30), 2 states have call predecessors, (30), 13 states have return successors, (38), 13 states have call predecessors, (38), 20 states have call successors, (38) Word has length 731 [2024-11-14 05:39:46,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:46,445 INFO L225 Difference]: With dead ends: 353 [2024-11-14 05:39:46,445 INFO L226 Difference]: Without dead ends: 208 [2024-11-14 05:39:46,447 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1505 GetRequests, 1447 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=428, Invalid=2328, Unknown=0, NotChecked=0, Total=2756 [2024-11-14 05:39:46,448 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 109 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:46,448 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 336 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 05:39:46,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2024-11-14 05:39:46,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 164. [2024-11-14 05:39:46,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 111 states have (on average 1.162162162162162) internal successors, (129), 111 states have internal predecessors, (129), 32 states have call successors, (32), 19 states have call predecessors, (32), 20 states have return successors, (90), 33 states have call predecessors, (90), 32 states have call successors, (90) [2024-11-14 05:39:46,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 251 transitions. [2024-11-14 05:39:46,473 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 251 transitions. Word has length 731 [2024-11-14 05:39:46,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:46,473 INFO L471 AbstractCegarLoop]: Abstraction has 164 states and 251 transitions. [2024-11-14 05:39:46,474 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.125) internal successors, (99), 25 states have internal predecessors, (99), 20 states have call successors, (30), 2 states have call predecessors, (30), 13 states have return successors, (38), 13 states have call predecessors, (38), 20 states have call successors, (38) [2024-11-14 05:39:46,474 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 251 transitions. [2024-11-14 05:39:46,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 624 [2024-11-14 05:39:46,479 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:46,479 INFO L215 NwaCegarLoop]: trace histogram [47, 47, 44, 44, 38, 36, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 16, 13, 9, 8, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:46,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-11-14 05:39:46,683 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:46,683 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:46,683 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:46,684 INFO L85 PathProgramCache]: Analyzing trace with hash -177719005, now seen corresponding path program 7 times [2024-11-14 05:39:46,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:46,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513864609] [2024-11-14 05:39:46,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:46,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:46,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:47,618 INFO L134 CoverageAnalysis]: Checked inductivity of 11377 backedges. 395 proven. 1229 refuted. 0 times theorem prover too weak. 9753 trivial. 0 not checked. [2024-11-14 05:39:47,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:47,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513864609] [2024-11-14 05:39:47,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513864609] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:47,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35062836] [2024-11-14 05:39:47,619 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:39:47,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:47,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:47,621 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:47,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 05:39:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:47,952 INFO L255 TraceCheckSpWp]: Trace formula consists of 1404 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 05:39:47,966 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:48,147 INFO L134 CoverageAnalysis]: Checked inductivity of 11377 backedges. 279 proven. 1784 refuted. 0 times theorem prover too weak. 9314 trivial. 0 not checked. [2024-11-14 05:39:48,148 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:39:52,992 INFO L134 CoverageAnalysis]: Checked inductivity of 11377 backedges. 279 proven. 1828 refuted. 0 times theorem prover too weak. 9270 trivial. 0 not checked. [2024-11-14 05:39:52,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35062836] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:39:52,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064342517] [2024-11-14 05:39:52,995 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:39:52,995 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:39:52,995 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:39:52,996 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:39:52,996 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 21] total 28 [2024-11-14 05:39:52,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126007403] [2024-11-14 05:39:52,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:39:52,998 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-14 05:39:52,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:39:52,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-14 05:39:52,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=626, Unknown=0, NotChecked=0, Total=756 [2024-11-14 05:39:52,999 INFO L87 Difference]: Start difference. First operand 164 states and 251 transitions. Second operand has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 24 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (39), 15 states have call predecessors, (39), 24 states have call successors, (39) [2024-11-14 05:39:53,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:39:53,420 INFO L93 Difference]: Finished difference Result 226 states and 425 transitions. [2024-11-14 05:39:53,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-14 05:39:53,420 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 24 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (39), 15 states have call predecessors, (39), 24 states have call successors, (39) Word has length 623 [2024-11-14 05:39:53,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:39:53,425 INFO L225 Difference]: With dead ends: 226 [2024-11-14 05:39:53,425 INFO L226 Difference]: Without dead ends: 202 [2024-11-14 05:39:53,426 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1226 SyntacticMatches, 9 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=292, Invalid=1268, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 05:39:53,427 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 47 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:39:53,428 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 221 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:39:53,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2024-11-14 05:39:53,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 187. [2024-11-14 05:39:53,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 125 states have (on average 1.144) internal successors, (143), 125 states have internal predecessors, (143), 36 states have call successors, (36), 19 states have call predecessors, (36), 25 states have return successors, (128), 42 states have call predecessors, (128), 36 states have call successors, (128) [2024-11-14 05:39:53,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 307 transitions. [2024-11-14 05:39:53,463 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 307 transitions. Word has length 623 [2024-11-14 05:39:53,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:39:53,465 INFO L471 AbstractCegarLoop]: Abstraction has 187 states and 307 transitions. [2024-11-14 05:39:53,466 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 28 states have internal predecessors, (92), 24 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (39), 15 states have call predecessors, (39), 24 states have call successors, (39) [2024-11-14 05:39:53,466 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 307 transitions. [2024-11-14 05:39:53,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1236 [2024-11-14 05:39:53,479 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:39:53,480 INFO L215 NwaCegarLoop]: trace histogram [91, 91, 90, 90, 74, 72, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 29, 27, 18, 17, 1, 1, 1, 1, 1, 1] [2024-11-14 05:39:53,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-14 05:39:53,680 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-14 05:39:53,680 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:39:53,680 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:39:53,680 INFO L85 PathProgramCache]: Analyzing trace with hash -473978396, now seen corresponding path program 8 times [2024-11-14 05:39:53,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:39:53,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66162520] [2024-11-14 05:39:53,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:39:53,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:39:53,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:39:56,052 INFO L134 CoverageAnalysis]: Checked inductivity of 45577 backedges. 799 proven. 3040 refuted. 0 times theorem prover too weak. 41738 trivial. 0 not checked. [2024-11-14 05:39:56,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:39:56,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66162520] [2024-11-14 05:39:56,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66162520] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:39:56,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698579622] [2024-11-14 05:39:56,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:39:56,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:39:56,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:39:56,055 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:39:56,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 05:39:56,411 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2024-11-14 05:39:56,411 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:39:56,415 INFO L255 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 05:39:56,429 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:39:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 45577 backedges. 3778 proven. 146 refuted. 0 times theorem prover too weak. 41653 trivial. 0 not checked. [2024-11-14 05:39:56,660 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:40:01,157 INFO L134 CoverageAnalysis]: Checked inductivity of 45577 backedges. 3778 proven. 152 refuted. 0 times theorem prover too weak. 41647 trivial. 0 not checked. [2024-11-14 05:40:01,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698579622] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:40:01,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [413304224] [2024-11-14 05:40:01,159 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:40:01,159 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:40:01,160 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:40:01,160 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:40:01,160 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 17] total 28 [2024-11-14 05:40:01,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822526529] [2024-11-14 05:40:01,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:40:01,163 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-14 05:40:01,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:40:01,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-14 05:40:01,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=666, Unknown=0, NotChecked=0, Total=756 [2024-11-14 05:40:01,164 INFO L87 Difference]: Start difference. First operand 187 states and 307 transitions. Second operand has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 19 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (39), 20 states have call predecessors, (39), 19 states have call successors, (39) [2024-11-14 05:40:02,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:40:02,303 INFO L93 Difference]: Finished difference Result 532 states and 1110 transitions. [2024-11-14 05:40:02,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 05:40:02,304 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 19 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (39), 20 states have call predecessors, (39), 19 states have call successors, (39) Word has length 1235 [2024-11-14 05:40:02,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:40:02,311 INFO L225 Difference]: With dead ends: 532 [2024-11-14 05:40:02,311 INFO L226 Difference]: Without dead ends: 344 [2024-11-14 05:40:02,314 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2519 GetRequests, 2453 SyntacticMatches, 8 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=523, Invalid=3017, Unknown=0, NotChecked=0, Total=3540 [2024-11-14 05:40:02,315 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 144 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 1058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-14 05:40:02,315 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 342 Invalid, 1058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 886 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-14 05:40:02,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2024-11-14 05:40:02,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 257. [2024-11-14 05:40:02,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 175 states have (on average 1.1371428571428572) internal successors, (199), 173 states have internal predecessors, (199), 52 states have call successors, (52), 32 states have call predecessors, (52), 29 states have return successors, (207), 51 states have call predecessors, (207), 52 states have call successors, (207) [2024-11-14 05:40:02,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 458 transitions. [2024-11-14 05:40:02,355 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 458 transitions. Word has length 1235 [2024-11-14 05:40:02,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:40:02,356 INFO L471 AbstractCegarLoop]: Abstraction has 257 states and 458 transitions. [2024-11-14 05:40:02,356 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 19 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (39), 20 states have call predecessors, (39), 19 states have call successors, (39) [2024-11-14 05:40:02,356 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 458 transitions. [2024-11-14 05:40:02,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1619 [2024-11-14 05:40:02,403 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:40:02,403 INFO L215 NwaCegarLoop]: trace histogram [122, 122, 115, 115, 98, 95, 61, 61, 61, 61, 61, 61, 61, 57, 57, 57, 57, 57, 57, 57, 41, 34, 24, 20, 1, 1, 1, 1, 1, 1] [2024-11-14 05:40:02,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 05:40:02,607 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-14 05:40:02,607 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:40:02,608 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:40:02,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1492490114, now seen corresponding path program 9 times [2024-11-14 05:40:02,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:40:02,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362501859] [2024-11-14 05:40:02,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:40:02,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:40:02,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:40:05,692 INFO L134 CoverageAnalysis]: Checked inductivity of 78666 backedges. 790 proven. 4309 refuted. 0 times theorem prover too weak. 73567 trivial. 0 not checked. [2024-11-14 05:40:05,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:40:05,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362501859] [2024-11-14 05:40:05,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362501859] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:40:05,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417402925] [2024-11-14 05:40:05,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:40:05,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:40:05,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:40:05,696 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:40:05,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 05:40:06,260 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:40:06,260 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:40:06,268 INFO L255 TraceCheckSpWp]: Trace formula consists of 2879 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-14 05:40:06,285 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:40:06,521 INFO L134 CoverageAnalysis]: Checked inductivity of 78666 backedges. 13887 proven. 176 refuted. 0 times theorem prover too weak. 64603 trivial. 0 not checked. [2024-11-14 05:40:06,521 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:40:13,131 INFO L134 CoverageAnalysis]: Checked inductivity of 78666 backedges. 856 proven. 5993 refuted. 0 times theorem prover too weak. 71817 trivial. 0 not checked. [2024-11-14 05:40:13,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417402925] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:40:13,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [888186651] [2024-11-14 05:40:13,133 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:40:13,134 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:40:13,134 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:40:13,135 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:40:13,135 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 19] total 29 [2024-11-14 05:40:13,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568005074] [2024-11-14 05:40:13,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:40:13,138 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 05:40:13,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:40:13,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 05:40:13,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2024-11-14 05:40:13,139 INFO L87 Difference]: Start difference. First operand 257 states and 458 transitions. Second operand has 29 states, 28 states have (on average 3.9642857142857144) internal successors, (111), 29 states have internal predecessors, (111), 24 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (44), 15 states have call predecessors, (44), 24 states have call successors, (44) [2024-11-14 05:40:14,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:40:14,195 INFO L93 Difference]: Finished difference Result 668 states and 1628 transitions. [2024-11-14 05:40:14,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2024-11-14 05:40:14,196 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.9642857142857144) internal successors, (111), 29 states have internal predecessors, (111), 24 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (44), 15 states have call predecessors, (44), 24 states have call successors, (44) Word has length 1618 [2024-11-14 05:40:14,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:40:14,204 INFO L225 Difference]: With dead ends: 668 [2024-11-14 05:40:14,204 INFO L226 Difference]: Without dead ends: 421 [2024-11-14 05:40:14,210 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3288 GetRequests, 3217 SyntacticMatches, 9 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=597, Invalid=3435, Unknown=0, NotChecked=0, Total=4032 [2024-11-14 05:40:14,210 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 145 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 829 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 05:40:14,210 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 400 Invalid, 990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 829 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 05:40:14,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2024-11-14 05:40:14,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 367. [2024-11-14 05:40:14,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 256 states have (on average 1.1015625) internal successors, (282), 247 states have internal predecessors, (282), 75 states have call successors, (75), 55 states have call predecessors, (75), 35 states have return successors, (359), 64 states have call predecessors, (359), 75 states have call successors, (359) [2024-11-14 05:40:14,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 716 transitions. [2024-11-14 05:40:14,268 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 716 transitions. Word has length 1618 [2024-11-14 05:40:14,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:40:14,269 INFO L471 AbstractCegarLoop]: Abstraction has 367 states and 716 transitions. [2024-11-14 05:40:14,269 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.9642857142857144) internal successors, (111), 29 states have internal predecessors, (111), 24 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (44), 15 states have call predecessors, (44), 24 states have call successors, (44) [2024-11-14 05:40:14,269 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 716 transitions. [2024-11-14 05:40:14,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1822 [2024-11-14 05:40:14,297 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:40:14,298 INFO L215 NwaCegarLoop]: trace histogram [135, 135, 132, 132, 109, 107, 67, 67, 67, 67, 67, 67, 67, 66, 66, 66, 66, 66, 66, 66, 42, 41, 28, 23, 1, 1, 1, 1, 1, 1] [2024-11-14 05:40:14,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-11-14 05:40:14,498 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-14 05:40:14,499 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:40:14,499 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:40:14,499 INFO L85 PathProgramCache]: Analyzing trace with hash 234508513, now seen corresponding path program 10 times [2024-11-14 05:40:14,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:40:14,500 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10713130] [2024-11-14 05:40:14,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:40:14,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:40:14,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:40:18,608 INFO L134 CoverageAnalysis]: Checked inductivity of 99745 backedges. 879 proven. 6322 refuted. 0 times theorem prover too weak. 92544 trivial. 0 not checked. [2024-11-14 05:40:18,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:40:18,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10713130] [2024-11-14 05:40:18,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10713130] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:40:18,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507418337] [2024-11-14 05:40:18,609 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:40:18,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:40:18,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:40:18,610 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:40:18,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 05:40:19,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:40:19,389 INFO L255 TraceCheckSpWp]: Trace formula consists of 4064 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-14 05:40:19,410 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:40:19,568 INFO L134 CoverageAnalysis]: Checked inductivity of 99745 backedges. 879 proven. 6322 refuted. 0 times theorem prover too weak. 92544 trivial. 0 not checked. [2024-11-14 05:40:19,568 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:40:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 99745 backedges. 879 proven. 6378 refuted. 0 times theorem prover too weak. 92488 trivial. 0 not checked. [2024-11-14 05:40:28,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507418337] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:40:28,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457743706] [2024-11-14 05:40:28,851 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:40:28,851 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:40:28,851 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:40:28,851 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:40:28,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 26 [2024-11-14 05:40:28,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036232849] [2024-11-14 05:40:28,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:40:28,857 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 05:40:28,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:40:28,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 05:40:28,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2024-11-14 05:40:28,858 INFO L87 Difference]: Start difference. First operand 367 states and 716 transitions. Second operand has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) [2024-11-14 05:40:29,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:40:29,245 INFO L93 Difference]: Finished difference Result 399 states and 808 transitions. [2024-11-14 05:40:29,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 05:40:29,246 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) Word has length 1821 [2024-11-14 05:40:29,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:40:29,256 INFO L225 Difference]: With dead ends: 399 [2024-11-14 05:40:29,256 INFO L226 Difference]: Without dead ends: 385 [2024-11-14 05:40:29,258 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3672 GetRequests, 3629 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=223, Invalid=967, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 05:40:29,258 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 57 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:40:29,258 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 237 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 05:40:29,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2024-11-14 05:40:29,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 367. [2024-11-14 05:40:29,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 256 states have (on average 1.1015625) internal successors, (282), 247 states have internal predecessors, (282), 75 states have call successors, (75), 55 states have call predecessors, (75), 35 states have return successors, (359), 64 states have call predecessors, (359), 75 states have call successors, (359) [2024-11-14 05:40:29,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 716 transitions. [2024-11-14 05:40:29,312 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 716 transitions. Word has length 1821 [2024-11-14 05:40:29,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:40:29,313 INFO L471 AbstractCegarLoop]: Abstraction has 367 states and 716 transitions. [2024-11-14 05:40:29,314 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 26 states have internal predecessors, (86), 23 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 11 states have call predecessors, (33), 23 states have call successors, (33) [2024-11-14 05:40:29,314 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 716 transitions. [2024-11-14 05:40:29,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1509 [2024-11-14 05:40:29,334 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:40:29,334 INFO L215 NwaCegarLoop]: trace histogram [112, 112, 109, 109, 91, 88, 56, 56, 56, 56, 56, 56, 56, 54, 54, 54, 54, 54, 54, 54, 37, 32, 21, 21, 1, 1, 1, 1, 1, 1] [2024-11-14 05:40:29,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 05:40:29,535 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-14 05:40:29,535 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:40:29,536 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:40:29,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1444832826, now seen corresponding path program 11 times [2024-11-14 05:40:29,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:40:29,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584811982] [2024-11-14 05:40:29,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:40:29,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:40:29,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:40:32,105 INFO L134 CoverageAnalysis]: Checked inductivity of 68215 backedges. 917 proven. 4402 refuted. 0 times theorem prover too weak. 62896 trivial. 0 not checked. [2024-11-14 05:40:32,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:40:32,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584811982] [2024-11-14 05:40:32,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584811982] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:40:32,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901946844] [2024-11-14 05:40:32,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:40:32,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:40:32,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:40:32,108 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:40:32,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 05:40:32,663 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2024-11-14 05:40:32,664 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:40:32,667 INFO L255 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 05:40:32,676 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:40:32,867 INFO L134 CoverageAnalysis]: Checked inductivity of 68215 backedges. 23672 proven. 157 refuted. 0 times theorem prover too weak. 44386 trivial. 0 not checked. [2024-11-14 05:40:32,867 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:40:37,827 INFO L134 CoverageAnalysis]: Checked inductivity of 68215 backedges. 3770 proven. 904 refuted. 0 times theorem prover too weak. 63541 trivial. 0 not checked. [2024-11-14 05:40:37,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901946844] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:40:37,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1987732249] [2024-11-14 05:40:37,829 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:40:37,829 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:40:37,829 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:40:37,830 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:40:37,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15] total 28 [2024-11-14 05:40:37,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703930004] [2024-11-14 05:40:37,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:40:37,836 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-14 05:40:37,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:40:37,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-14 05:40:37,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2024-11-14 05:40:37,838 INFO L87 Difference]: Start difference. First operand 367 states and 716 transitions. Second operand has 28 states, 27 states have (on average 4.111111111111111) internal successors, (111), 28 states have internal predecessors, (111), 19 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2024-11-14 05:40:39,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:40:39,161 INFO L93 Difference]: Finished difference Result 867 states and 1958 transitions. [2024-11-14 05:40:39,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2024-11-14 05:40:39,162 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.111111111111111) internal successors, (111), 28 states have internal predecessors, (111), 19 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) Word has length 1508 [2024-11-14 05:40:39,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:40:39,171 INFO L225 Difference]: With dead ends: 867 [2024-11-14 05:40:39,171 INFO L226 Difference]: Without dead ends: 479 [2024-11-14 05:40:39,178 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3070 GetRequests, 3002 SyntacticMatches, 7 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 915 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=631, Invalid=3275, Unknown=0, NotChecked=0, Total=3906 [2024-11-14 05:40:39,179 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 153 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 1015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-14 05:40:39,179 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 351 Invalid, 1015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-14 05:40:39,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2024-11-14 05:40:39,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 385. [2024-11-14 05:40:39,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 269 states have (on average 1.0929368029739777) internal successors, (294), 263 states have internal predecessors, (294), 82 states have call successors, (82), 60 states have call predecessors, (82), 33 states have return successors, (355), 61 states have call predecessors, (355), 82 states have call successors, (355) [2024-11-14 05:40:39,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 731 transitions. [2024-11-14 05:40:39,240 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 731 transitions. Word has length 1508 [2024-11-14 05:40:39,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:40:39,242 INFO L471 AbstractCegarLoop]: Abstraction has 385 states and 731 transitions. [2024-11-14 05:40:39,242 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.111111111111111) internal successors, (111), 28 states have internal predecessors, (111), 19 states have call successors, (36), 2 states have call predecessors, (36), 16 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2024-11-14 05:40:39,242 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 731 transitions. [2024-11-14 05:40:39,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2395 [2024-11-14 05:40:39,284 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:40:39,285 INFO L215 NwaCegarLoop]: trace histogram [181, 181, 170, 170, 143, 142, 90, 90, 90, 90, 90, 90, 90, 85, 85, 85, 85, 85, 85, 85, 58, 52, 38, 28, 1, 1, 1, 1, 1, 1] [2024-11-14 05:40:39,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-14 05:40:39,485 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 05:40:39,488 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:40:39,488 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:40:39,488 INFO L85 PathProgramCache]: Analyzing trace with hash 546347021, now seen corresponding path program 12 times [2024-11-14 05:40:39,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:40:39,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116949482] [2024-11-14 05:40:39,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:40:39,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:40:40,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:40:47,011 INFO L134 CoverageAnalysis]: Checked inductivity of 173084 backedges. 2537 proven. 9779 refuted. 0 times theorem prover too weak. 160768 trivial. 0 not checked. [2024-11-14 05:40:47,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:40:47,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116949482] [2024-11-14 05:40:47,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116949482] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:40:47,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426120885] [2024-11-14 05:40:47,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:40:47,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:40:47,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:40:47,013 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:40:47,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-14 05:40:47,865 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:40:47,865 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:40:47,878 INFO L255 TraceCheckSpWp]: Trace formula consists of 4260 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-14 05:40:47,893 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:40:48,161 INFO L134 CoverageAnalysis]: Checked inductivity of 173084 backedges. 62317 proven. 1753 refuted. 0 times theorem prover too weak. 109014 trivial. 0 not checked. [2024-11-14 05:40:48,162 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:41:02,188 INFO L134 CoverageAnalysis]: Checked inductivity of 173084 backedges. 2157 proven. 13335 refuted. 0 times theorem prover too weak. 157592 trivial. 0 not checked. [2024-11-14 05:41:02,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426120885] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:41:02,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905789998] [2024-11-14 05:41:02,190 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:41:02,191 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:41:02,193 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:41:02,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:41:02,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 31] total 42 [2024-11-14 05:41:02,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769276184] [2024-11-14 05:41:02,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:41:02,198 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2024-11-14 05:41:02,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:41:02,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2024-11-14 05:41:02,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1541, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 05:41:02,199 INFO L87 Difference]: Start difference. First operand 385 states and 731 transitions. Second operand has 42 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 42 states have internal predecessors, (145), 35 states have call successors, (46), 2 states have call predecessors, (46), 19 states have return successors, (62), 21 states have call predecessors, (62), 35 states have call successors, (62) [2024-11-14 05:41:04,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:41:04,270 INFO L93 Difference]: Finished difference Result 820 states and 1714 transitions. [2024-11-14 05:41:04,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2024-11-14 05:41:04,271 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 42 states have internal predecessors, (145), 35 states have call successors, (46), 2 states have call predecessors, (46), 19 states have return successors, (62), 21 states have call predecessors, (62), 35 states have call successors, (62) Word has length 2394 [2024-11-14 05:41:04,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:41:04,278 INFO L225 Difference]: With dead ends: 820 [2024-11-14 05:41:04,278 INFO L226 Difference]: Without dead ends: 437 [2024-11-14 05:41:04,284 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4865 GetRequests, 4758 SyntacticMatches, 15 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2505 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1176, Invalid=7566, Unknown=0, NotChecked=0, Total=8742 [2024-11-14 05:41:04,285 INFO L432 NwaCegarLoop]: 54 mSDtfsCounter, 247 mSDsluCounter, 790 mSDsCounter, 0 mSdLazyCounter, 1710 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 844 SdHoareTripleChecker+Invalid, 1955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 1710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-14 05:41:04,285 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 844 Invalid, 1955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 1710 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-14 05:41:04,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2024-11-14 05:41:04,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 306. [2024-11-14 05:41:04,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 213 states have (on average 1.0751173708920188) internal successors, (229), 211 states have internal predecessors, (229), 66 states have call successors, (66), 46 states have call predecessors, (66), 26 states have return successors, (182), 48 states have call predecessors, (182), 66 states have call successors, (182) [2024-11-14 05:41:04,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 477 transitions. [2024-11-14 05:41:04,329 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 477 transitions. Word has length 2394 [2024-11-14 05:41:04,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:41:04,330 INFO L471 AbstractCegarLoop]: Abstraction has 306 states and 477 transitions. [2024-11-14 05:41:04,331 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 42 states have internal predecessors, (145), 35 states have call successors, (46), 2 states have call predecessors, (46), 19 states have return successors, (62), 21 states have call predecessors, (62), 35 states have call successors, (62) [2024-11-14 05:41:04,331 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 477 transitions. [2024-11-14 05:41:04,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2026 [2024-11-14 05:41:04,361 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:41:04,362 INFO L215 NwaCegarLoop]: trace histogram [151, 151, 146, 146, 120, 120, 75, 75, 75, 75, 75, 75, 75, 73, 73, 73, 73, 73, 73, 73, 47, 45, 31, 26, 1, 1, 1, 1, 1, 1] [2024-11-14 05:41:04,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-14 05:41:04,562 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:41:04,563 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:41:04,563 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:41:04,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1757131278, now seen corresponding path program 13 times [2024-11-14 05:41:04,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:41:04,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791847737] [2024-11-14 05:41:04,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:41:04,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:41:04,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:41:10,647 INFO L134 CoverageAnalysis]: Checked inductivity of 123532 backedges. 2830 proven. 9429 refuted. 0 times theorem prover too weak. 111273 trivial. 0 not checked. [2024-11-14 05:41:10,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:41:10,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791847737] [2024-11-14 05:41:10,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791847737] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:41:10,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105382042] [2024-11-14 05:41:10,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:41:10,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:41:10,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:41:10,649 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:41:10,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-14 05:41:11,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:41:11,583 INFO L255 TraceCheckSpWp]: Trace formula consists of 4517 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-14 05:41:11,594 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:41:11,830 INFO L134 CoverageAnalysis]: Checked inductivity of 123532 backedges. 971 proven. 7883 refuted. 0 times theorem prover too weak. 114678 trivial. 0 not checked. [2024-11-14 05:41:11,831 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:41:24,123 INFO L134 CoverageAnalysis]: Checked inductivity of 123532 backedges. 971 proven. 7953 refuted. 0 times theorem prover too weak. 114608 trivial. 0 not checked. [2024-11-14 05:41:24,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105382042] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:41:24,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137238362] [2024-11-14 05:41:24,125 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:41:24,126 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:41:24,126 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:41:24,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:41:24,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 16, 25] total 43 [2024-11-14 05:41:24,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23450196] [2024-11-14 05:41:24,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:41:24,129 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2024-11-14 05:41:24,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:41:24,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2024-11-14 05:41:24,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1618, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 05:41:24,131 INFO L87 Difference]: Start difference. First operand 306 states and 477 transitions. Second operand has 43 states, 41 states have (on average 3.292682926829268) internal successors, (135), 43 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 22 states have return successors, (59), 23 states have call predecessors, (59), 37 states have call successors, (59) [2024-11-14 05:41:26,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:41:26,684 INFO L93 Difference]: Finished difference Result 784 states and 1470 transitions. [2024-11-14 05:41:26,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2024-11-14 05:41:26,685 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 3.292682926829268) internal successors, (135), 43 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 22 states have return successors, (59), 23 states have call predecessors, (59), 37 states have call successors, (59) Word has length 2025 [2024-11-14 05:41:26,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:41:26,693 INFO L225 Difference]: With dead ends: 784 [2024-11-14 05:41:26,694 INFO L226 Difference]: Without dead ends: 448 [2024-11-14 05:41:26,699 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4135 GetRequests, 4029 SyntacticMatches, 11 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2632 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1196, Invalid=8116, Unknown=0, NotChecked=0, Total=9312 [2024-11-14 05:41:26,699 INFO L432 NwaCegarLoop]: 61 mSDtfsCounter, 220 mSDsluCounter, 1005 mSDsCounter, 0 mSdLazyCounter, 2194 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 1066 SdHoareTripleChecker+Invalid, 2457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 2194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:41:26,700 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 1066 Invalid, 2457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 2194 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2024-11-14 05:41:26,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2024-11-14 05:41:26,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 314. [2024-11-14 05:41:26,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 218 states have (on average 1.0596330275229358) internal successors, (231), 216 states have internal predecessors, (231), 67 states have call successors, (67), 46 states have call predecessors, (67), 28 states have return successors, (192), 51 states have call predecessors, (192), 67 states have call successors, (192) [2024-11-14 05:41:26,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 490 transitions. [2024-11-14 05:41:26,758 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 490 transitions. Word has length 2025 [2024-11-14 05:41:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:41:26,758 INFO L471 AbstractCegarLoop]: Abstraction has 314 states and 490 transitions. [2024-11-14 05:41:26,759 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 3.292682926829268) internal successors, (135), 43 states have internal predecessors, (135), 37 states have call successors, (43), 1 states have call predecessors, (43), 22 states have return successors, (59), 23 states have call predecessors, (59), 37 states have call successors, (59) [2024-11-14 05:41:26,759 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 490 transitions. [2024-11-14 05:41:26,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3388 [2024-11-14 05:41:26,836 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:41:26,837 INFO L215 NwaCegarLoop]: trace histogram [251, 251, 246, 246, 202, 200, 125, 125, 125, 125, 125, 125, 125, 123, 123, 123, 123, 123, 123, 123, 77, 77, 51, 44, 1, 1, 1, 1, 1, 1] [2024-11-14 05:41:26,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-14 05:41:27,037 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:41:27,038 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:41:27,038 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:41:27,039 INFO L85 PathProgramCache]: Analyzing trace with hash 1495652926, now seen corresponding path program 14 times [2024-11-14 05:41:27,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:41:27,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787994610] [2024-11-14 05:41:27,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:41:27,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:41:27,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:41:38,022 INFO L134 CoverageAnalysis]: Checked inductivity of 347253 backedges. 1873 proven. 11776 refuted. 0 times theorem prover too weak. 333604 trivial. 0 not checked. [2024-11-14 05:41:38,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:41:38,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787994610] [2024-11-14 05:41:38,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787994610] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:41:38,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309411826] [2024-11-14 05:41:38,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:41:38,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:41:38,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:41:38,025 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:41:38,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-14 05:41:38,851 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2024-11-14 05:41:38,851 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:41:38,856 INFO L255 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 05:41:38,879 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:41:39,208 INFO L134 CoverageAnalysis]: Checked inductivity of 347253 backedges. 13563 proven. 300 refuted. 0 times theorem prover too weak. 333390 trivial. 0 not checked. [2024-11-14 05:41:39,208 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:41:52,399 INFO L134 CoverageAnalysis]: Checked inductivity of 347253 backedges. 13565 proven. 313 refuted. 0 times theorem prover too weak. 333375 trivial. 0 not checked. [2024-11-14 05:41:52,399 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309411826] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:41:52,399 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621346659] [2024-11-14 05:41:52,401 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:41:52,402 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:41:52,402 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java: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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:41:52,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:41:52,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 21] total 36 [2024-11-14 05:41:52,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234465074] [2024-11-14 05:41:52,404 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:41:52,406 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-14 05:41:52,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:41:52,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-14 05:41:52,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 05:41:52,408 INFO L87 Difference]: Start difference. First operand 314 states and 490 transitions. Second operand has 36 states, 35 states have (on average 3.4571428571428573) internal successors, (121), 36 states have internal predecessors, (121), 26 states have call successors, (36), 1 states have call predecessors, (36), 21 states have return successors, (51), 25 states have call predecessors, (51), 26 states have call successors, (51) [2024-11-14 05:41:54,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:41:54,371 INFO L93 Difference]: Finished difference Result 804 states and 1381 transitions. [2024-11-14 05:41:54,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2024-11-14 05:41:54,372 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.4571428571428573) internal successors, (121), 36 states have internal predecessors, (121), 26 states have call successors, (36), 1 states have call predecessors, (36), 21 states have return successors, (51), 25 states have call predecessors, (51), 26 states have call successors, (51) Word has length 3387 [2024-11-14 05:41:54,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:41:54,382 INFO L225 Difference]: With dead ends: 804 [2024-11-14 05:41:54,382 INFO L226 Difference]: Without dead ends: 479 [2024-11-14 05:41:54,387 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6846 GetRequests, 6751 SyntacticMatches, 10 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2086 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1013, Invalid=6469, Unknown=0, NotChecked=0, Total=7482 [2024-11-14 05:41:54,388 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 169 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 1444 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 1588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 1444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-14 05:41:54,388 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 608 Invalid, 1588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 1444 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-14 05:41:54,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2024-11-14 05:41:54,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 367. [2024-11-14 05:41:54,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 257 states have (on average 1.0622568093385214) internal successors, (273), 254 states have internal predecessors, (273), 79 states have call successors, (79), 57 states have call predecessors, (79), 30 states have return successors, (256), 55 states have call predecessors, (256), 79 states have call successors, (256) [2024-11-14 05:41:54,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 608 transitions. [2024-11-14 05:41:54,518 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 608 transitions. Word has length 3387 [2024-11-14 05:41:54,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:41:54,520 INFO L471 AbstractCegarLoop]: Abstraction has 367 states and 608 transitions. [2024-11-14 05:41:54,520 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.4571428571428573) internal successors, (121), 36 states have internal predecessors, (121), 26 states have call successors, (36), 1 states have call predecessors, (36), 21 states have return successors, (51), 25 states have call predecessors, (51), 26 states have call successors, (51) [2024-11-14 05:41:54,520 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 608 transitions. [2024-11-14 05:41:54,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5594 [2024-11-14 05:41:54,729 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:41:54,731 INFO L215 NwaCegarLoop]: trace histogram [411, 411, 410, 410, 333, 331, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 128, 126, 80, 77, 1, 1, 1, 1, 1, 1] [2024-11-14 05:41:54,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-14 05:41:54,931 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:41:54,932 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:41:54,932 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:41:54,933 INFO L85 PathProgramCache]: Analyzing trace with hash 896323614, now seen corresponding path program 15 times [2024-11-14 05:41:54,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:41:54,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558807119] [2024-11-14 05:41:54,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:41:54,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:41:56,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:42:25,555 INFO L134 CoverageAnalysis]: Checked inductivity of 949573 backedges. 3941 proven. 18798 refuted. 0 times theorem prover too weak. 926834 trivial. 0 not checked. [2024-11-14 05:42:25,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:42:25,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558807119] [2024-11-14 05:42:25,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558807119] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:42:25,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445536127] [2024-11-14 05:42:25,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:42:25,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:42:25,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:42:25,557 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:42:25,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-14 05:42:27,542 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:42:27,542 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:42:27,577 INFO L255 TraceCheckSpWp]: Trace formula consists of 9953 conjuncts, 34 conjuncts are in the unsatisfiable core [2024-11-14 05:42:27,613 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:42:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 949573 backedges. 289183 proven. 3727 refuted. 0 times theorem prover too weak. 656663 trivial. 0 not checked. [2024-11-14 05:42:28,056 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:42:56,714 INFO L134 CoverageAnalysis]: Checked inductivity of 949573 backedges. 4215 proven. 35941 refuted. 0 times theorem prover too weak. 909417 trivial. 0 not checked. [2024-11-14 05:42:56,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445536127] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:42:56,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [760621750] [2024-11-14 05:42:56,716 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:42:56,717 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:42:56,717 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:42:56,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:42:56,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23, 35] total 43 [2024-11-14 05:42:56,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284284029] [2024-11-14 05:42:56,719 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:42:56,723 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2024-11-14 05:42:56,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:42:56,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2024-11-14 05:42:56,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 05:42:56,724 INFO L87 Difference]: Start difference. First operand 367 states and 608 transitions. Second operand has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 38 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 21 states have call predecessors, (64), 38 states have call successors, (64) [2024-11-14 05:42:59,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:42:59,209 INFO L93 Difference]: Finished difference Result 705 states and 1262 transitions. [2024-11-14 05:42:59,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2024-11-14 05:42:59,210 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 38 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 21 states have call predecessors, (64), 38 states have call successors, (64) Word has length 5593 [2024-11-14 05:42:59,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:42:59,219 INFO L225 Difference]: With dead ends: 705 [2024-11-14 05:42:59,219 INFO L226 Difference]: Without dead ends: 360 [2024-11-14 05:42:59,224 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 11267 GetRequests, 11149 SyntacticMatches, 17 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2847 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1388, Invalid=9118, Unknown=0, NotChecked=0, Total=10506 [2024-11-14 05:42:59,225 INFO L432 NwaCegarLoop]: 58 mSDtfsCounter, 245 mSDsluCounter, 849 mSDsCounter, 0 mSdLazyCounter, 1805 mSolverCounterSat, 298 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 907 SdHoareTripleChecker+Invalid, 2103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 298 IncrementalHoareTripleChecker+Valid, 1805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2024-11-14 05:42:59,227 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 907 Invalid, 2103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [298 Valid, 1805 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2024-11-14 05:42:59,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2024-11-14 05:42:59,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 311. [2024-11-14 05:42:59,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 219 states have (on average 1.0410958904109588) internal successors, (228), 216 states have internal predecessors, (228), 66 states have call successors, (66), 50 states have call predecessors, (66), 25 states have return successors, (178), 44 states have call predecessors, (178), 66 states have call successors, (178) [2024-11-14 05:42:59,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 472 transitions. [2024-11-14 05:42:59,285 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 472 transitions. Word has length 5593 [2024-11-14 05:42:59,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:42:59,286 INFO L471 AbstractCegarLoop]: Abstraction has 311 states and 472 transitions. [2024-11-14 05:42:59,287 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 38 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 21 states have call predecessors, (64), 38 states have call successors, (64) [2024-11-14 05:42:59,287 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 472 transitions. [2024-11-14 05:42:59,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3919 [2024-11-14 05:42:59,465 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:42:59,466 INFO L215 NwaCegarLoop]: trace histogram [290, 290, 285, 285, 233, 232, 145, 145, 145, 145, 145, 145, 145, 142, 142, 142, 142, 142, 142, 142, 90, 88, 58, 52, 1, 1, 1, 1, 1, 1] [2024-11-14 05:42:59,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-14 05:42:59,666 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:42:59,666 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:42:59,669 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:42:59,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1042157483, now seen corresponding path program 16 times [2024-11-14 05:42:59,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:42:59,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30610137] [2024-11-14 05:42:59,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:42:59,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:43:00,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:43:23,351 INFO L134 CoverageAnalysis]: Checked inductivity of 465128 backedges. 6265 proven. 21173 refuted. 0 times theorem prover too weak. 437690 trivial. 0 not checked. [2024-11-14 05:43:23,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:43:23,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30610137] [2024-11-14 05:43:23,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30610137] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:43:23,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656851608] [2024-11-14 05:43:23,351 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:43:23,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:43:23,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:43:23,353 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:43:23,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-14 05:43:25,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:43:25,177 INFO L255 TraceCheckSpWp]: Trace formula consists of 8720 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-14 05:43:25,202 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:43:25,509 INFO L134 CoverageAnalysis]: Checked inductivity of 465128 backedges. 1907 proven. 17156 refuted. 0 times theorem prover too weak. 446065 trivial. 0 not checked. [2024-11-14 05:43:25,509 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:43:46,653 INFO L134 CoverageAnalysis]: Checked inductivity of 465128 backedges. 1907 proven. 17241 refuted. 0 times theorem prover too weak. 445980 trivial. 0 not checked. [2024-11-14 05:43:46,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656851608] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:43:46,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422976981] [2024-11-14 05:43:46,656 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:43:46,656 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:43:46,656 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:43:46,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:43:46,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 17, 27] total 46 [2024-11-14 05:43:46,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360781630] [2024-11-14 05:43:46,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:43:46,662 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2024-11-14 05:43:46,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:43:46,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2024-11-14 05:43:46,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2024-11-14 05:43:46,664 INFO L87 Difference]: Start difference. First operand 311 states and 472 transitions. Second operand has 46 states, 44 states have (on average 3.272727272727273) internal successors, (144), 46 states have internal predecessors, (144), 40 states have call successors, (46), 1 states have call predecessors, (46), 24 states have return successors, (64), 25 states have call predecessors, (64), 40 states have call successors, (64) [2024-11-14 05:43:49,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:43:49,248 INFO L93 Difference]: Finished difference Result 758 states and 1375 transitions. [2024-11-14 05:43:49,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2024-11-14 05:43:49,249 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 44 states have (on average 3.272727272727273) internal successors, (144), 46 states have internal predecessors, (144), 40 states have call successors, (46), 1 states have call predecessors, (46), 24 states have return successors, (64), 25 states have call predecessors, (64), 40 states have call successors, (64) Word has length 3918 [2024-11-14 05:43:49,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:43:49,258 INFO L225 Difference]: With dead ends: 758 [2024-11-14 05:43:49,258 INFO L226 Difference]: Without dead ends: 430 [2024-11-14 05:43:49,263 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7931 GetRequests, 7815 SyntacticMatches, 12 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3214 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1397, Invalid=9733, Unknown=0, NotChecked=0, Total=11130 [2024-11-14 05:43:49,264 INFO L432 NwaCegarLoop]: 66 mSDtfsCounter, 299 mSDsluCounter, 1046 mSDsCounter, 0 mSdLazyCounter, 2324 mSolverCounterSat, 363 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 1112 SdHoareTripleChecker+Invalid, 2687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 363 IncrementalHoareTripleChecker+Valid, 2324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:43:49,264 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 1112 Invalid, 2687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [363 Valid, 2324 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2024-11-14 05:43:49,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2024-11-14 05:43:49,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 390. [2024-11-14 05:43:49,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 278 states have (on average 1.039568345323741) internal successors, (289), 272 states have internal predecessors, (289), 84 states have call successors, (84), 68 states have call predecessors, (84), 27 states have return successors, (228), 49 states have call predecessors, (228), 84 states have call successors, (228) [2024-11-14 05:43:49,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 601 transitions. [2024-11-14 05:43:49,333 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 601 transitions. Word has length 3918 [2024-11-14 05:43:49,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:43:49,334 INFO L471 AbstractCegarLoop]: Abstraction has 390 states and 601 transitions. [2024-11-14 05:43:49,335 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 44 states have (on average 3.272727272727273) internal successors, (144), 46 states have internal predecessors, (144), 40 states have call successors, (46), 1 states have call predecessors, (46), 24 states have return successors, (64), 25 states have call predecessors, (64), 40 states have call successors, (64) [2024-11-14 05:43:49,335 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 601 transitions. [2024-11-14 05:43:49,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3919 [2024-11-14 05:43:49,448 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:43:49,449 INFO L215 NwaCegarLoop]: trace histogram [288, 288, 287, 287, 233, 232, 144, 144, 144, 144, 144, 144, 144, 143, 143, 143, 143, 143, 143, 143, 90, 88, 55, 55, 1, 1, 1, 1, 1, 1] [2024-11-14 05:43:49,488 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-14 05:43:49,649 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:43:49,650 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:43:49,650 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:43:49,651 INFO L85 PathProgramCache]: Analyzing trace with hash -521285565, now seen corresponding path program 17 times [2024-11-14 05:43:49,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:43:49,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331259106] [2024-11-14 05:43:49,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:43:49,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:43:51,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:44:06,294 INFO L134 CoverageAnalysis]: Checked inductivity of 465096 backedges. 9048 proven. 8401 refuted. 0 times theorem prover too weak. 447647 trivial. 0 not checked. [2024-11-14 05:44:06,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:44:06,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331259106] [2024-11-14 05:44:06,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331259106] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:44:06,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631173228] [2024-11-14 05:44:06,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 05:44:06,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:44:06,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:44:06,296 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:44:06,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-14 05:44:07,652 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2024-11-14 05:44:07,652 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:44:07,661 INFO L255 TraceCheckSpWp]: Trace formula consists of 1784 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 05:44:07,685 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:44:07,932 INFO L134 CoverageAnalysis]: Checked inductivity of 465096 backedges. 2499 proven. 18156 refuted. 0 times theorem prover too weak. 444441 trivial. 0 not checked. [2024-11-14 05:44:07,932 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:44:31,158 INFO L134 CoverageAnalysis]: Checked inductivity of 465096 backedges. 2499 proven. 18258 refuted. 0 times theorem prover too weak. 444339 trivial. 0 not checked. [2024-11-14 05:44:31,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631173228] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:44:31,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392702924] [2024-11-14 05:44:31,161 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:44:31,161 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:44:31,161 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:44:31,162 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:44:31,163 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 29] total 34 [2024-11-14 05:44:31,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266702050] [2024-11-14 05:44:31,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:44:31,169 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2024-11-14 05:44:31,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:44:31,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2024-11-14 05:44:31,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=943, Unknown=0, NotChecked=0, Total=1122 [2024-11-14 05:44:31,171 INFO L87 Difference]: Start difference. First operand 390 states and 601 transitions. Second operand has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 16 states have return successors, (47), 17 states have call predecessors, (47), 30 states have call successors, (47) [2024-11-14 05:44:31,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:44:31,844 INFO L93 Difference]: Finished difference Result 433 states and 732 transitions. [2024-11-14 05:44:31,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 05:44:31,845 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 16 states have return successors, (47), 17 states have call predecessors, (47), 30 states have call successors, (47) Word has length 3918 [2024-11-14 05:44:31,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:44:31,854 INFO L225 Difference]: With dead ends: 433 [2024-11-14 05:44:31,855 INFO L226 Difference]: Without dead ends: 411 [2024-11-14 05:44:31,856 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7873 GetRequests, 7814 SyntacticMatches, 13 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=410, Invalid=1846, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 05:44:31,857 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 70 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 05:44:31,857 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 247 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 05:44:31,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2024-11-14 05:44:31,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 396. [2024-11-14 05:44:31,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 282 states have (on average 1.0390070921985815) internal successors, (293), 276 states have internal predecessors, (293), 84 states have call successors, (84), 68 states have call predecessors, (84), 29 states have return successors, (241), 51 states have call predecessors, (241), 84 states have call successors, (241) [2024-11-14 05:44:31,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 618 transitions. [2024-11-14 05:44:31,932 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 618 transitions. Word has length 3918 [2024-11-14 05:44:31,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:44:31,933 INFO L471 AbstractCegarLoop]: Abstraction has 396 states and 618 transitions. [2024-11-14 05:44:31,934 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 3.4375) internal successors, (110), 34 states have internal predecessors, (110), 30 states have call successors, (34), 1 states have call predecessors, (34), 16 states have return successors, (47), 17 states have call predecessors, (47), 30 states have call successors, (47) [2024-11-14 05:44:31,934 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 618 transitions. [2024-11-14 05:44:32,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7555 [2024-11-14 05:44:32,253 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:44:32,255 INFO L215 NwaCegarLoop]: trace histogram [557, 557, 552, 552, 450, 447, 278, 278, 278, 278, 278, 278, 278, 276, 276, 276, 276, 276, 276, 276, 174, 169, 107, 105, 1, 1, 1, 1, 1, 1] [2024-11-14 05:44:32,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-14 05:44:32,455 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:44:32,455 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:44:32,455 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:44:32,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1969747590, now seen corresponding path program 18 times [2024-11-14 05:44:32,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:44:32,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866550896] [2024-11-14 05:44:32,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:44:32,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:44:37,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:45:39,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1734206 backedges. 10696 proven. 26435 refuted. 0 times theorem prover too weak. 1697075 trivial. 0 not checked. [2024-11-14 05:45:39,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:45:39,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866550896] [2024-11-14 05:45:39,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866550896] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:45:39,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186065032] [2024-11-14 05:45:39,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 05:45:39,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:45:39,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:45:39,977 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:45:39,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-14 05:45:42,860 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 05:45:42,860 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 05:45:42,910 INFO L255 TraceCheckSpWp]: Trace formula consists of 13443 conjuncts, 42 conjuncts are in the unsatisfiable core [2024-11-14 05:45:42,964 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:45:43,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1734206 backedges. 807899 proven. 13038 refuted. 0 times theorem prover too weak. 913269 trivial. 0 not checked. [2024-11-14 05:45:43,635 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:46:30,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1734206 backedges. 11579 proven. 55443 refuted. 0 times theorem prover too weak. 1667184 trivial. 0 not checked. [2024-11-14 05:46:30,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186065032] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:46:30,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37221992] [2024-11-14 05:46:30,696 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:46:30,696 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:46:30,696 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:46:30,697 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:46:30,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27, 43] total 51 [2024-11-14 05:46:30,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111176168] [2024-11-14 05:46:30,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:46:30,709 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-14 05:46:30,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:46:30,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-14 05:46:30,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=2311, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 05:46:30,711 INFO L87 Difference]: Start difference. First operand 396 states and 618 transitions. Second operand has 51 states, 50 states have (on average 3.54) internal successors, (177), 51 states have internal predecessors, (177), 46 states have call successors, (56), 2 states have call predecessors, (56), 25 states have return successors, (76), 25 states have call predecessors, (76), 46 states have call successors, (76) [2024-11-14 05:46:34,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:46:34,783 INFO L93 Difference]: Finished difference Result 929 states and 1696 transitions. [2024-11-14 05:46:34,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2024-11-14 05:46:34,784 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 3.54) internal successors, (177), 51 states have internal predecessors, (177), 46 states have call successors, (56), 2 states have call predecessors, (56), 25 states have return successors, (76), 25 states have call predecessors, (76), 46 states have call successors, (76) Word has length 7554 [2024-11-14 05:46:34,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:46:34,794 INFO L225 Difference]: With dead ends: 929 [2024-11-14 05:46:34,794 INFO L226 Difference]: Without dead ends: 555 [2024-11-14 05:46:34,799 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 15209 GetRequests, 15063 SyntacticMatches, 21 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4591 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2027, Invalid=13975, Unknown=0, NotChecked=0, Total=16002 [2024-11-14 05:46:34,800 INFO L432 NwaCegarLoop]: 69 mSDtfsCounter, 296 mSDsluCounter, 1201 mSDsCounter, 0 mSdLazyCounter, 3008 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 1270 SdHoareTripleChecker+Invalid, 3346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 3008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2024-11-14 05:46:34,800 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 1270 Invalid, 3346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 3008 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2024-11-14 05:46:34,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2024-11-14 05:46:34,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 380. [2024-11-14 05:46:34,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 267 states have (on average 1.0411985018726593) internal successors, (278), 263 states have internal predecessors, (278), 81 states have call successors, (81), 61 states have call predecessors, (81), 31 states have return successors, (226), 55 states have call predecessors, (226), 81 states have call successors, (226) [2024-11-14 05:46:34,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 585 transitions. [2024-11-14 05:46:34,883 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 585 transitions. Word has length 7554 [2024-11-14 05:46:34,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:46:34,886 INFO L471 AbstractCegarLoop]: Abstraction has 380 states and 585 transitions. [2024-11-14 05:46:34,887 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 3.54) internal successors, (177), 51 states have internal predecessors, (177), 46 states have call successors, (56), 2 states have call predecessors, (56), 25 states have return successors, (76), 25 states have call predecessors, (76), 46 states have call successors, (76) [2024-11-14 05:46:34,887 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 585 transitions. [2024-11-14 05:46:35,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8767 [2024-11-14 05:46:35,390 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:46:35,392 INFO L215 NwaCegarLoop]: trace histogram [645, 645, 642, 642, 521, 520, 322, 322, 322, 322, 322, 322, 322, 321, 321, 321, 321, 321, 321, 321, 200, 198, 124, 122, 1, 1, 1, 1, 1, 1] [2024-11-14 05:46:35,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-14 05:46:35,592 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-14 05:46:35,592 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:46:35,593 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:46:35,594 INFO L85 PathProgramCache]: Analyzing trace with hash -532658115, now seen corresponding path program 19 times [2024-11-14 05:46:35,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:46:35,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176254178] [2024-11-14 05:46:35,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:46:35,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:46:42,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:48:54,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2336368 backedges. 16749 proven. 60161 refuted. 0 times theorem prover too weak. 2259458 trivial. 0 not checked. [2024-11-14 05:48:54,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 05:48:54,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176254178] [2024-11-14 05:48:54,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176254178] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 05:48:54,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427895984] [2024-11-14 05:48:54,439 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 05:48:54,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 05:48:54,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 05:48:54,444 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 05:48:54,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-14 05:48:58,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 05:48:59,009 INFO L255 TraceCheckSpWp]: Trace formula consists of 19484 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-14 05:48:59,067 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 05:48:59,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2336368 backedges. 4601 proven. 45889 refuted. 0 times theorem prover too weak. 2285878 trivial. 0 not checked. [2024-11-14 05:48:59,609 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 05:49:51,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2336368 backedges. 4601 proven. 46009 refuted. 0 times theorem prover too weak. 2285758 trivial. 0 not checked. [2024-11-14 05:49:51,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427895984] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 05:49:51,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542704376] [2024-11-14 05:49:51,653 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 05:49:51,653 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 05:49:51,653 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:429) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:315) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:276) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-14 05:49:51,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 05:49:51,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 19, 31] total 51 [2024-11-14 05:49:51,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859405588] [2024-11-14 05:49:51,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 05:49:51,665 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2024-11-14 05:49:51,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 05:49:51,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2024-11-14 05:49:51,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=2288, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 05:49:51,668 INFO L87 Difference]: Start difference. First operand 380 states and 585 transitions. Second operand has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) [2024-11-14 05:49:55,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 05:49:55,803 INFO L93 Difference]: Finished difference Result 919 states and 1728 transitions. [2024-11-14 05:49:55,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2024-11-14 05:49:55,804 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) Word has length 8766 [2024-11-14 05:49:55,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 05:49:55,815 INFO L225 Difference]: With dead ends: 919 [2024-11-14 05:49:55,815 INFO L226 Difference]: Without dead ends: 513 [2024-11-14 05:49:55,820 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 17647 GetRequests, 17511 SyntacticMatches, 15 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4539 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1832, Invalid=13174, Unknown=0, NotChecked=0, Total=15006 [2024-11-14 05:49:55,820 INFO L432 NwaCegarLoop]: 76 mSDtfsCounter, 293 mSDsluCounter, 1543 mSDsCounter, 0 mSdLazyCounter, 3674 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 1619 SdHoareTripleChecker+Invalid, 4017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 3674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2024-11-14 05:49:55,821 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 1619 Invalid, 4017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 3674 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2024-11-14 05:49:55,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2024-11-14 05:49:55,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 455. [2024-11-14 05:49:55,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 324 states have (on average 1.0339506172839505) internal successors, (335), 318 states have internal predecessors, (335), 98 states have call successors, (98), 79 states have call predecessors, (98), 32 states have return successors, (307), 57 states have call predecessors, (307), 98 states have call successors, (307) [2024-11-14 05:49:55,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 740 transitions. [2024-11-14 05:49:55,916 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 740 transitions. Word has length 8766 [2024-11-14 05:49:55,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 05:49:55,918 INFO L471 AbstractCegarLoop]: Abstraction has 455 states and 740 transitions. [2024-11-14 05:49:55,918 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) [2024-11-14 05:49:55,919 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 740 transitions. [2024-11-14 05:49:57,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15399 [2024-11-14 05:49:57,362 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 05:49:57,364 INFO L215 NwaCegarLoop]: trace histogram [1132, 1132, 1129, 1129, 916, 913, 566, 566, 566, 566, 566, 566, 566, 564, 564, 564, 564, 564, 564, 564, 352, 347, 216, 216, 1, 1, 1, 1, 1, 1] [2024-11-14 05:49:57,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2024-11-14 05:49:57,565 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54744646-ff68-4acb-8699-3a476d3d874f/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-14 05:49:57,565 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 05:49:57,568 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 05:49:57,569 INFO L85 PathProgramCache]: Analyzing trace with hash -498177522, now seen corresponding path program 20 times [2024-11-14 05:49:57,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 05:49:57,570 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611275519] [2024-11-14 05:49:57,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 05:49:57,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 05:50:18,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat