./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/unreach-call.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4a390ef5 Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 698c604312f3eb09bef7f8f6e092d43de99877a411ec8f3c76598811466d02b7 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4a390ef-m [2024-10-24 00:07:28,675 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-24 00:07:28,742 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-10-24 00:07:28,748 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-24 00:07:28,751 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-24 00:07:28,781 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-24 00:07:28,781 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-24 00:07:28,782 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-24 00:07:28,782 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-10-24 00:07:28,783 INFO L153 SettingsManager]: * Use memory slicer=true [2024-10-24 00:07:28,783 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-24 00:07:28,783 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-24 00:07:28,784 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-24 00:07:28,784 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-24 00:07:28,785 INFO L153 SettingsManager]: * Use SBE=true [2024-10-24 00:07:28,785 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-24 00:07:28,785 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-24 00:07:28,786 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-24 00:07:28,786 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-24 00:07:28,786 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-24 00:07:28,787 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-24 00:07:28,787 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-24 00:07:28,788 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-24 00:07:28,788 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-24 00:07:28,788 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-24 00:07:28,789 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-24 00:07:28,789 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-24 00:07:28,789 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-24 00:07:28,790 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-24 00:07:28,790 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-24 00:07:28,791 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-10-24 00:07:28,791 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-24 00:07:28,791 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 00:07:28,792 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-24 00:07:28,792 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-24 00:07:28,792 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-24 00:07:28,793 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-24 00:07:28,793 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-24 00:07:28,793 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-24 00:07:28,794 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-24 00:07:28,794 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-24 00:07:28,795 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-24 00:07:28,795 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 698c604312f3eb09bef7f8f6e092d43de99877a411ec8f3c76598811466d02b7 [2024-10-24 00:07:29,131 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-24 00:07:29,153 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-24 00:07:29,156 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-24 00:07:29,157 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-24 00:07:29,157 INFO L274 PluginConnector]: CDTParser initialized [2024-10-24 00:07:29,159 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i [2024-10-24 00:07:30,864 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-24 00:07:31,058 INFO L384 CDTParser]: Found 1 translation units. [2024-10-24 00:07:31,059 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i [2024-10-24 00:07:31,066 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/997597ccc/4e0692cad3fb4c5d81dcebbbff17844a/FLAGd571a6f69 [2024-10-24 00:07:31,448 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/997597ccc/4e0692cad3fb4c5d81dcebbbff17844a [2024-10-24 00:07:31,451 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-24 00:07:31,452 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-24 00:07:31,454 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-24 00:07:31,454 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-24 00:07:31,459 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-24 00:07:31,460 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,461 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ea75e83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31, skipping insertion in model container [2024-10-24 00:07:31,461 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,481 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-24 00:07:31,632 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i[951,964] [2024-10-24 00:07:31,645 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 00:07:31,656 INFO L200 MainTranslator]: Completed pre-run [2024-10-24 00:07:31,673 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound50.i[951,964] [2024-10-24 00:07:31,681 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 00:07:31,714 INFO L204 MainTranslator]: Completed translation [2024-10-24 00:07:31,714 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31 WrapperNode [2024-10-24 00:07:31,715 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-24 00:07:31,716 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-24 00:07:31,719 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-24 00:07:31,719 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-24 00:07:31,730 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,736 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,761 INFO L138 Inliner]: procedures = 16, calls = 9, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2024-10-24 00:07:31,761 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-24 00:07:31,762 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-24 00:07:31,762 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-24 00:07:31,762 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-24 00:07:31,777 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,777 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,783 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,810 INFO L175 MemorySlicer]: Split 2 memory accesses to 1 slices as follows [2]. 100 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2]. The 0 writes are split as follows [0]. [2024-10-24 00:07:31,811 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,812 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,820 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,824 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,825 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,826 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,828 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-24 00:07:31,828 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-24 00:07:31,829 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-24 00:07:31,829 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-24 00:07:31,830 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (1/1) ... [2024-10-24 00:07:31,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 00:07:31,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 00:07:31,865 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-10-24 00:07:31,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-10-24 00:07:31,946 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-24 00:07:31,947 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-10-24 00:07:31,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-24 00:07:31,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-24 00:07:31,947 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-10-24 00:07:31,947 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-10-24 00:07:32,079 INFO L238 CfgBuilder]: Building ICFG [2024-10-24 00:07:32,082 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-24 00:07:32,249 INFO L? ?]: Removed 7 outVars from TransFormulas that were not future-live. [2024-10-24 00:07:32,249 INFO L287 CfgBuilder]: Performing block encoding [2024-10-24 00:07:32,273 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-24 00:07:32,277 INFO L314 CfgBuilder]: Removed 2 assume(true) statements. [2024-10-24 00:07:32,278 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:07:32 BoogieIcfgContainer [2024-10-24 00:07:32,278 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-24 00:07:32,279 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-24 00:07:32,280 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-24 00:07:32,283 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-24 00:07:32,286 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:07:31" (1/3) ... [2024-10-24 00:07:32,287 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e46b5b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:07:32, skipping insertion in model container [2024-10-24 00:07:32,288 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:07:31" (2/3) ... [2024-10-24 00:07:32,288 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e46b5b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:07:32, skipping insertion in model container [2024-10-24 00:07:32,289 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:07:32" (3/3) ... [2024-10-24 00:07:32,291 INFO L112 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound50.i [2024-10-24 00:07:32,308 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-24 00:07:32,309 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-10-24 00:07:32,360 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-24 00:07:32,368 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=PETRI_NET, 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;@4210862e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-24 00:07:32,368 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-10-24 00:07:32,372 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 00:07:32,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-10-24 00:07:32,378 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:07:32,379 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 00:07:32,380 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:07:32,384 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:07:32,384 INFO L85 PathProgramCache]: Analyzing trace with hash 334653711, now seen corresponding path program 1 times [2024-10-24 00:07:32,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:07:32,393 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130043800] [2024-10-24 00:07:32,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:32,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:07:32,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:07:32,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 00:07:32,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:07:32,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130043800] [2024-10-24 00:07:32,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130043800] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 00:07:32,529 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 00:07:32,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-24 00:07:32,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355748104] [2024-10-24 00:07:32,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 00:07:32,535 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-10-24 00:07:32,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:07:32,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-10-24 00:07:32,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-24 00:07:32,556 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 00:07:32,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 00:07:32,580 INFO L93 Difference]: Finished difference Result 34 states and 53 transitions. [2024-10-24 00:07:32,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-10-24 00:07:32,587 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2024-10-24 00:07:32,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 00:07:32,601 INFO L225 Difference]: With dead ends: 34 [2024-10-24 00:07:32,601 INFO L226 Difference]: Without dead ends: 16 [2024-10-24 00:07:32,608 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-24 00:07:32,615 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-10-24 00:07:32,616 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-10-24 00:07:32,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2024-10-24 00:07:32,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2024-10-24 00:07:32,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 00:07:32,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2024-10-24 00:07:32,657 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2024-10-24 00:07:32,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 00:07:32,657 INFO L471 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2024-10-24 00:07:32,657 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 00:07:32,658 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2024-10-24 00:07:32,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-10-24 00:07:32,658 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:07:32,658 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 00:07:32,659 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-24 00:07:32,659 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:07:32,660 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:07:32,660 INFO L85 PathProgramCache]: Analyzing trace with hash -401566674, now seen corresponding path program 1 times [2024-10-24 00:07:32,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:07:32,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076966921] [2024-10-24 00:07:32,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:32,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:07:32,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 00:07:32,683 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1156535379] [2024-10-24 00:07:32,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:32,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:07:32,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 00:07:32,689 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 00:07:32,690 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-10-24 00:07:32,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:07:32,738 INFO L255 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-10-24 00:07:32,743 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 00:07:32,902 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 00:07:32,905 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-10-24 00:07:32,906 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:07:32,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076966921] [2024-10-24 00:07:32,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 00:07:32,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156535379] [2024-10-24 00:07:32,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156535379] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 00:07:32,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 00:07:32,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-10-24 00:07:32,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064314811] [2024-10-24 00:07:32,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 00:07:32,913 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-10-24 00:07:32,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:07:32,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-10-24 00:07:32,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-10-24 00:07:32,914 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 00:07:32,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 00:07:32,985 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2024-10-24 00:07:32,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-10-24 00:07:32,986 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2024-10-24 00:07:32,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 00:07:32,987 INFO L225 Difference]: With dead ends: 27 [2024-10-24 00:07:32,987 INFO L226 Difference]: Without dead ends: 24 [2024-10-24 00:07:32,988 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-10-24 00:07:32,989 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-10-24 00:07:32,990 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 37 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-10-24 00:07:32,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-10-24 00:07:32,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-10-24 00:07:32,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 00:07:32,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2024-10-24 00:07:32,997 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 10 [2024-10-24 00:07:32,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 00:07:32,997 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2024-10-24 00:07:32,998 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 00:07:33,001 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2024-10-24 00:07:33,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-10-24 00:07:33,004 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:07:33,004 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 00:07:33,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-10-24 00:07:33,205 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:07:33,206 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:07:33,208 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:07:33,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1989427041, now seen corresponding path program 1 times [2024-10-24 00:07:33,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:07:33,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262839524] [2024-10-24 00:07:33,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:33,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:07:33,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:07:33,497 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 00:07:33,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:07:33,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 00:07:33,509 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:07:33,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262839524] [2024-10-24 00:07:33,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262839524] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 00:07:33,510 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 00:07:33,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-10-24 00:07:33,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959207625] [2024-10-24 00:07:33,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 00:07:33,511 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 00:07:33,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:07:33,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 00:07:33,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 00:07:33,512 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 00:07:33,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 00:07:33,531 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2024-10-24 00:07:33,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 00:07:33,531 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2024-10-24 00:07:33,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 00:07:33,532 INFO L225 Difference]: With dead ends: 48 [2024-10-24 00:07:33,532 INFO L226 Difference]: Without dead ends: 26 [2024-10-24 00:07:33,533 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 00:07:33,534 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-10-24 00:07:33,534 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-10-24 00:07:33,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-10-24 00:07:33,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-10-24 00:07:33,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 00:07:33,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2024-10-24 00:07:33,540 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 18 [2024-10-24 00:07:33,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 00:07:33,540 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2024-10-24 00:07:33,540 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 00:07:33,540 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2024-10-24 00:07:33,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-10-24 00:07:33,541 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:07:33,541 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 00:07:33,542 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-10-24 00:07:33,542 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:07:33,542 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:07:33,542 INFO L85 PathProgramCache]: Analyzing trace with hash -989864836, now seen corresponding path program 1 times [2024-10-24 00:07:33,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:07:33,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713169511] [2024-10-24 00:07:33,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:33,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:07:33,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 00:07:33,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [841836432] [2024-10-24 00:07:33,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:33,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:07:33,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 00:07:33,576 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 00:07:33,582 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-10-24 00:07:33,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:07:33,695 INFO L255 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-10-24 00:07:33,698 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 00:07:34,146 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-10-24 00:07:34,146 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 00:07:59,191 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:07:59,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713169511] [2024-10-24 00:07:59,192 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 00:07:59,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841836432] [2024-10-24 00:07:59,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841836432] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 00:07:59,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-24 00:07:59,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2024-10-24 00:07:59,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616017895] [2024-10-24 00:07:59,193 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-24 00:07:59,193 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-10-24 00:07:59,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:07:59,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-10-24 00:07:59,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=165, Unknown=6, NotChecked=0, Total=210 [2024-10-24 00:07:59,195 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 00:07:59,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 00:07:59,358 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2024-10-24 00:07:59,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-10-24 00:07:59,358 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2024-10-24 00:07:59,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 00:07:59,359 INFO L225 Difference]: With dead ends: 36 [2024-10-24 00:07:59,359 INFO L226 Difference]: Without dead ends: 33 [2024-10-24 00:07:59,360 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=45, Invalid=189, Unknown=6, NotChecked=0, Total=240 [2024-10-24 00:07:59,361 INFO L432 NwaCegarLoop]: 8 mSDtfsCounter, 18 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 00:07:59,361 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 48 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 00:07:59,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2024-10-24 00:07:59,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2024-10-24 00:07:59,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.2) internal successors, (30), 26 states have internal predecessors, (30), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 00:07:59,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2024-10-24 00:07:59,372 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 20 [2024-10-24 00:07:59,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 00:07:59,372 INFO L471 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2024-10-24 00:07:59,372 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 00:07:59,373 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2024-10-24 00:07:59,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-10-24 00:07:59,373 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:07:59,373 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 00:07:59,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-10-24 00:07:59,574 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2024-10-24 00:07:59,575 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:07:59,575 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:07:59,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1620400559, now seen corresponding path program 2 times [2024-10-24 00:07:59,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:07:59,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746424590] [2024-10-24 00:07:59,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:07:59,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:07:59,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:08:00,119 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-10-24 00:08:00,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:08:00,136 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2024-10-24 00:08:00,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 00:08:00,145 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 00:08:00,146 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:08:00,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746424590] [2024-10-24 00:08:00,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746424590] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 00:08:00,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239401872] [2024-10-24 00:08:00,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-24 00:08:00,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:08:00,147 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 00:08:00,149 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 00:08:00,151 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-10-24 00:08:00,249 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-24 00:08:00,249 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-24 00:08:00,250 INFO L255 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-10-24 00:08:00,252 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 00:08:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 00:08:00,381 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 00:08:00,662 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 00:08:00,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239401872] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 00:08:00,663 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 00:08:00,663 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 15 [2024-10-24 00:08:00,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537391664] [2024-10-24 00:08:00,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 00:08:00,664 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-10-24 00:08:00,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:08:00,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-10-24 00:08:00,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2024-10-24 00:08:00,665 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-24 00:08:00,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 00:08:00,805 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2024-10-24 00:08:00,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-10-24 00:08:00,805 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 28 [2024-10-24 00:08:00,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 00:08:00,806 INFO L225 Difference]: With dead ends: 71 [2024-10-24 00:08:00,806 INFO L226 Difference]: Without dead ends: 38 [2024-10-24 00:08:00,807 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2024-10-24 00:08:00,808 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 00:08:00,808 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 93 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 00:08:00,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-10-24 00:08:00,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2024-10-24 00:08:00,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 00:08:00,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2024-10-24 00:08:00,816 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 28 [2024-10-24 00:08:00,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 00:08:00,816 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2024-10-24 00:08:00,817 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-24 00:08:00,817 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2024-10-24 00:08:00,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-10-24 00:08:00,817 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 00:08:00,817 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2024-10-24 00:08:00,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-10-24 00:08:01,021 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:08:01,022 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 00:08:01,023 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 00:08:01,023 INFO L85 PathProgramCache]: Analyzing trace with hash -620785398, now seen corresponding path program 3 times [2024-10-24 00:08:01,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 00:08:01,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166163373] [2024-10-24 00:08:01,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 00:08:01,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 00:08:01,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 00:08:01,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [138493822] [2024-10-24 00:08:01,066 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-10-24 00:08:01,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 00:08:01,066 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 00:08:01,068 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 00:08:01,069 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-10-24 00:08:24,340 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-10-24 00:08:24,340 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-24 00:08:24,345 WARN L253 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-10-24 00:08:24,347 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 00:08:25,055 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 00:08:25,056 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 00:09:04,684 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 00:09:04,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 00:09:04,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166163373] [2024-10-24 00:09:04,685 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 00:09:04,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138493822] [2024-10-24 00:09:04,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138493822] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 00:09:04,685 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 00:09:04,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12] total 25 [2024-10-24 00:09:04,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540673045] [2024-10-24 00:09:04,685 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 00:09:04,686 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-24 00:09:04,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 00:09:04,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-24 00:09:04,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=484, Unknown=2, NotChecked=0, Total=600 [2024-10-24 00:09:04,688 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 25 states, 25 states have (on average 1.8) internal successors, (45), 23 states have internal predecessors, (45), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)