./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c --full-output --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --witnessprinter.yaml.format.version 2.1 --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 04d6fb36 Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/automizer/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/automizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/automizer/data -tc /storage/repos/certificate-witnesses-artifact/automizer/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c -s /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/certificate-witnesses-artifact/automizer --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 4b6ae28789704f5fd465d11d450ce27cd9b971ac76fe8e36268d0ace5b5b057f --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --witnessprinter.yaml.format.version 2.1 --- Real Ultimate output --- This is Ultimate 0.2.4-tmp.dk.referee-eval-04d6fb3-m [2024-09-15 19:42:16,292 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-15 19:42:16,372 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-09-15 19:42:16,378 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-15 19:42:16,379 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-15 19:42:16,407 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-15 19:42:16,407 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-15 19:42:16,408 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-15 19:42:16,408 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-15 19:42:16,410 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-15 19:42:16,410 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-15 19:42:16,411 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-15 19:42:16,411 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-15 19:42:16,414 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-15 19:42:16,414 INFO L153 SettingsManager]: * Use SBE=true [2024-09-15 19:42:16,414 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-15 19:42:16,415 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-15 19:42:16,415 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-15 19:42:16,415 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-09-15 19:42:16,415 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-15 19:42:16,416 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-15 19:42:16,416 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-15 19:42:16,416 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-15 19:42:16,417 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-15 19:42:16,417 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-15 19:42:16,417 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-15 19:42:16,417 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-15 19:42:16,417 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-15 19:42:16,418 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-15 19:42:16,418 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-15 19:42:16,418 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-15 19:42:16,418 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-15 19:42:16,418 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-15 19:42:16,418 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-15 19:42:16,419 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-15 19:42:16,419 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-15 19:42:16,419 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-09-15 19:42:16,419 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-09-15 19:42:16,419 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-15 19:42:16,420 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-15 19:42:16,420 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-15 19:42:16,422 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-15 19:42:16,422 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/certificate-witnesses-artifact/automizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/certificate-witnesses-artifact/automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4b6ae28789704f5fd465d11d450ce27cd9b971ac76fe8e36268d0ace5b5b057f Applying setting for plugin de.uni_freiburg.informatik.ultimate.boogie.procedureinliner: Inline calls to implemented procedures -> NEVER Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> All Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: YAML Format version -> 2.1 [2024-09-15 19:42:16,762 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-15 19:42:16,785 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-15 19:42:16,787 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-15 19:42:16,788 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-15 19:42:16,789 INFO L274 PluginConnector]: CDTParser initialized [2024-09-15 19:42:16,790 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/automizer/../sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c [2024-09-15 19:42:18,359 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-15 19:42:18,524 INFO L384 CDTParser]: Found 1 translation units. [2024-09-15 19:42:18,525 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c [2024-09-15 19:42:18,532 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/automizer/data/2395a01e7/b513d14b950146e2ae0a621583bdd751/FLAGbb580977e [2024-09-15 19:42:18,918 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/automizer/data/2395a01e7/b513d14b950146e2ae0a621583bdd751 [2024-09-15 19:42:18,920 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-15 19:42:18,921 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-09-15 19:42:18,922 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-15 19:42:18,922 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-15 19:42:18,927 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-15 19:42:18,927 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.09 07:42:18" (1/1) ... [2024-09-15 19:42:18,929 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31b4e9f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:18, skipping insertion in model container [2024-09-15 19:42:18,929 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.09 07:42:18" (1/1) ... [2024-09-15 19:42:18,947 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-15 19:42:19,088 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c[520,533] [2024-09-15 19:42:19,112 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-15 19:42:19,124 INFO L200 MainTranslator]: Completed pre-run [2024-09-15 19:42:19,134 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/sqrt1-ll_unwindbound20.c[520,533] [2024-09-15 19:42:19,144 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-15 19:42:19,160 INFO L204 MainTranslator]: Completed translation [2024-09-15 19:42:19,160 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19 WrapperNode [2024-09-15 19:42:19,161 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-09-15 19:42:19,162 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-09-15 19:42:19,162 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-09-15 19:42:19,162 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-09-15 19:42:19,169 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,175 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,181 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2024-09-15 19:42:19,182 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-09-15 19:42:19,183 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-09-15 19:42:19,183 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-09-15 19:42:19,183 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-09-15 19:42:19,192 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,192 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,197 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,216 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]. [2024-09-15 19:42:19,216 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,216 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,223 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,226 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,228 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,229 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,230 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-09-15 19:42:19,232 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-09-15 19:42:19,233 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-09-15 19:42:19,233 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-09-15 19:42:19,234 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (1/1) ... [2024-09-15 19:42:19,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-15 19:42:19,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:19,267 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-09-15 19:42:19,271 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-09-15 19:42:19,323 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-09-15 19:42:19,323 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-09-15 19:42:19,323 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-09-15 19:42:19,323 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-09-15 19:42:19,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-09-15 19:42:19,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-09-15 19:42:19,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-09-15 19:42:19,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-09-15 19:42:19,324 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-09-15 19:42:19,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-09-15 19:42:19,397 INFO L242 CfgBuilder]: Building ICFG [2024-09-15 19:42:19,399 INFO L268 CfgBuilder]: Building CFG for each procedure with an implementation [2024-09-15 19:42:19,577 INFO L? ?]: Removed 4 outVars from TransFormulas that were not future-live. [2024-09-15 19:42:19,577 INFO L291 CfgBuilder]: Performing block encoding [2024-09-15 19:42:19,605 INFO L313 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-09-15 19:42:19,606 INFO L318 CfgBuilder]: Removed 1 assume(true) statements. [2024-09-15 19:42:19,606 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.09 07:42:19 BoogieIcfgContainer [2024-09-15 19:42:19,607 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-09-15 19:42:19,609 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-09-15 19:42:19,609 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-09-15 19:42:19,612 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-09-15 19:42:19,613 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.09 07:42:18" (1/3) ... [2024-09-15 19:42:19,613 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e3d1c9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.09 07:42:19, skipping insertion in model container [2024-09-15 19:42:19,613 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 07:42:19" (2/3) ... [2024-09-15 19:42:19,614 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e3d1c9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.09 07:42:19, skipping insertion in model container [2024-09-15 19:42:19,614 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.09 07:42:19" (3/3) ... [2024-09-15 19:42:19,615 INFO L112 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound20.c [2024-09-15 19:42:19,632 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:All NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-09-15 19:42:19,633 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-09-15 19:42:19,701 INFO L335 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-09-15 19:42:19,713 INFO L336 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=All, 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;@5d285c62, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-09-15 19:42:19,714 INFO L337 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-09-15 19:42:19,718 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2024-09-15 19:42:19,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-09-15 19:42:19,726 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:19,726 INFO L216 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:19,727 INFO L399 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:19,732 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:19,735 INFO L85 PathProgramCache]: Analyzing trace with hash -97680429, now seen corresponding path program 1 times [2024-09-15 19:42:19,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:19,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681911352] [2024-09-15 19:42:19,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:19,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:19,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:19,883 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-15 19:42:19,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:19,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-15 19:42:19,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:19,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681911352] [2024-09-15 19:42:19,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681911352] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-15 19:42:19,896 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-15 19:42:19,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-09-15 19:42:19,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647494058] [2024-09-15 19:42:19,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:19,902 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-09-15 19:42:19,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:19,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-09-15 19:42:19,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-09-15 19:42:19,935 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:20,013 INFO L93 Difference]: Finished difference Result 44 states and 67 transitions. [2024-09-15 19:42:20,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-09-15 19:42:20,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2024-09-15 19:42:20,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:20,022 INFO L225 Difference]: With dead ends: 44 [2024-09-15 19:42:20,022 INFO L226 Difference]: Without dead ends: 21 [2024-09-15 19:42:20,025 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-09-15 19:42:20,028 INFO L434 NwaCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:20,029 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 29 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-09-15 19:42:20,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2024-09-15 19:42:20,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2024-09-15 19:42:20,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-09-15 19:42:20,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2024-09-15 19:42:20,076 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 10 [2024-09-15 19:42:20,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:20,078 INFO L474 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2024-09-15 19:42:20,078 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,079 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,079 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2024-09-15 19:42:20,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-09-15 19:42:20,079 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:20,080 INFO L216 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:20,080 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-09-15 19:42:20,080 INFO L399 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:20,082 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,082 INFO L85 PathProgramCache]: Analyzing trace with hash 801118595, now seen corresponding path program 1 times [2024-09-15 19:42:20,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:20,084 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575170566] [2024-09-15 19:42:20,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:20,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:20,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:20,269 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-15 19:42:20,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:20,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-15 19:42:20,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:20,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575170566] [2024-09-15 19:42:20,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575170566] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-15 19:42:20,301 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-15 19:42:20,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-09-15 19:42:20,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554756615] [2024-09-15 19:42:20,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:20,302 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-09-15 19:42:20,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:20,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-09-15 19:42:20,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-09-15 19:42:20,305 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:20,419 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2024-09-15 19:42:20,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-09-15 19:42:20,420 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2024-09-15 19:42:20,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:20,421 INFO L225 Difference]: With dead ends: 31 [2024-09-15 19:42:20,421 INFO L226 Difference]: Without dead ends: 22 [2024-09-15 19:42:20,422 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-09-15 19:42:20,423 INFO L434 NwaCegarLoop]: 18 mSDtfsCounter, 6 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:20,425 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-15 19:42:20,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2024-09-15 19:42:20,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2024-09-15 19:42:20,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-09-15 19:42:20,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2024-09-15 19:42:20,438 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 11 [2024-09-15 19:42:20,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:20,438 INFO L474 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2024-09-15 19:42:20,438 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,439 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,439 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2024-09-15 19:42:20,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-09-15 19:42:20,440 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:20,440 INFO L216 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:20,440 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-09-15 19:42:20,441 INFO L399 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:20,442 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,442 INFO L85 PathProgramCache]: Analyzing trace with hash 802786891, now seen corresponding path program 1 times [2024-09-15 19:42:20,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:20,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411383923] [2024-09-15 19:42:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:20,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:20,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:20,621 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-15 19:42:20,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:20,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-15 19:42:20,630 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:20,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411383923] [2024-09-15 19:42:20,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411383923] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-15 19:42:20,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-15 19:42:20,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-09-15 19:42:20,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145007542] [2024-09-15 19:42:20,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:20,631 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-09-15 19:42:20,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:20,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-09-15 19:42:20,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2024-09-15 19:42:20,636 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:20,764 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2024-09-15 19:42:20,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-09-15 19:42:20,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2024-09-15 19:42:20,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:20,765 INFO L225 Difference]: With dead ends: 35 [2024-09-15 19:42:20,765 INFO L226 Difference]: Without dead ends: 33 [2024-09-15 19:42:20,766 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2024-09-15 19:42:20,767 INFO L434 NwaCegarLoop]: 16 mSDtfsCounter, 13 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:20,767 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 53 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-15 19:42:20,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2024-09-15 19:42:20,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2024-09-15 19:42:20,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 17 states have internal predecessors, (19), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2024-09-15 19:42:20,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2024-09-15 19:42:20,785 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 11 [2024-09-15 19:42:20,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:20,786 INFO L474 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2024-09-15 19:42:20,786 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-15 19:42:20,787 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,787 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2024-09-15 19:42:20,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-09-15 19:42:20,788 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:20,789 INFO L216 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:20,790 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-09-15 19:42:20,790 INFO L399 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:20,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:20,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1280493866, now seen corresponding path program 1 times [2024-09-15 19:42:20,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:20,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955348728] [2024-09-15 19:42:20,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:20,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:20,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-15 19:42:20,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [209518089] [2024-09-15 19:42:20,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:20,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:20,815 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:20,817 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-09-15 19:42:20,819 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-09-15 19:42:20,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:20,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-09-15 19:42:20,876 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-15 19:42:20,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-15 19:42:20,945 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-09-15 19:42:20,945 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:20,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955348728] [2024-09-15 19:42:20,945 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-15 19:42:20,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209518089] [2024-09-15 19:42:20,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209518089] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-15 19:42:20,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-15 19:42:20,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-09-15 19:42:20,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172853213] [2024-09-15 19:42:20,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:20,948 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-09-15 19:42:20,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:20,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-09-15 19:42:20,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-09-15 19:42:20,949 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-09-15 19:42:21,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:21,004 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2024-09-15 19:42:21,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-09-15 19:42:21,005 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2024-09-15 19:42:21,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:21,006 INFO L225 Difference]: With dead ends: 39 [2024-09-15 19:42:21,006 INFO L226 Difference]: Without dead ends: 37 [2024-09-15 19:42:21,006 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-09-15 19:42:21,007 INFO L434 NwaCegarLoop]: 22 mSDtfsCounter, 4 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:21,008 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 78 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-09-15 19:42:21,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2024-09-15 19:42:21,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2024-09-15 19:42:21,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 20 states have internal predecessors, (22), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2024-09-15 19:42:21,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2024-09-15 19:42:21,017 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 16 [2024-09-15 19:42:21,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:21,017 INFO L474 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2024-09-15 19:42:21,018 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-09-15 19:42:21,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:21,018 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2024-09-15 19:42:21,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-09-15 19:42:21,019 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:21,019 INFO L216 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:21,038 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-09-15 19:42:21,220 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:21,220 INFO L399 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:21,221 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:21,221 INFO L85 PathProgramCache]: Analyzing trace with hash 925975787, now seen corresponding path program 1 times [2024-09-15 19:42:21,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:21,221 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135699865] [2024-09-15 19:42:21,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:21,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:21,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-15 19:42:21,234 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [131561870] [2024-09-15 19:42:21,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:21,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:21,234 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:21,236 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-09-15 19:42:21,237 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-09-15 19:42:21,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-09-15 19:42:21,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-15 19:42:21,351 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-09-15 19:42:21,352 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-09-15 19:42:21,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:21,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135699865] [2024-09-15 19:42:21,353 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-15 19:42:21,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131561870] [2024-09-15 19:42:21,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131561870] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-15 19:42:21,353 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-15 19:42:21,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-09-15 19:42:21,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082825061] [2024-09-15 19:42:21,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:21,354 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-09-15 19:42:21,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:21,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-09-15 19:42:21,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-09-15 19:42:21,356 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-09-15 19:42:21,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:21,412 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2024-09-15 19:42:21,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-09-15 19:42:21,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2024-09-15 19:42:21,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:21,414 INFO L225 Difference]: With dead ends: 43 [2024-09-15 19:42:21,414 INFO L226 Difference]: Without dead ends: 38 [2024-09-15 19:42:21,415 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-09-15 19:42:21,416 INFO L434 NwaCegarLoop]: 27 mSDtfsCounter, 4 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:21,416 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 93 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-09-15 19:42:21,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-09-15 19:42:21,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2024-09-15 19:42:21,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-09-15 19:42:21,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2024-09-15 19:42:21,426 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 21 [2024-09-15 19:42:21,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:21,426 INFO L474 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2024-09-15 19:42:21,427 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-09-15 19:42:21,427 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:21,427 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2024-09-15 19:42:21,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2024-09-15 19:42:21,428 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:21,428 INFO L216 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:21,444 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-09-15 19:42:21,629 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:21,629 INFO L399 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:21,630 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:21,630 INFO L85 PathProgramCache]: Analyzing trace with hash 1435580062, now seen corresponding path program 1 times [2024-09-15 19:42:21,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:21,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619493895] [2024-09-15 19:42:21,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:21,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:21,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,745 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-15 19:42:21,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,755 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2024-09-15 19:42:21,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,760 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2024-09-15 19:42:21,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,766 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2024-09-15 19:42:21,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,776 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-15 19:42:21,777 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:21,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619493895] [2024-09-15 19:42:21,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619493895] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-15 19:42:21,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282593576] [2024-09-15 19:42:21,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:21,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:21,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:21,781 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-09-15 19:42:21,782 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-09-15 19:42:21,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:21,823 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-09-15 19:42:21,825 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-15 19:42:21,886 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-15 19:42:21,886 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-15 19:42:21,976 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-15 19:42:21,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282593576] provided 0 perfect and 2 imperfect interpolant sequences [2024-09-15 19:42:21,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-09-15 19:42:21,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 11 [2024-09-15 19:42:21,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316301182] [2024-09-15 19:42:21,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-09-15 19:42:21,977 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-09-15 19:42:21,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:21,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-09-15 19:42:21,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2024-09-15 19:42:21,979 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (12), 5 states have call predecessors, (12), 3 states have call successors, (12) [2024-09-15 19:42:22,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:22,199 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2024-09-15 19:42:22,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-09-15 19:42:22,199 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (12), 5 states have call predecessors, (12), 3 states have call successors, (12) Word has length 29 [2024-09-15 19:42:22,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:22,201 INFO L225 Difference]: With dead ends: 79 [2024-09-15 19:42:22,201 INFO L226 Difference]: Without dead ends: 70 [2024-09-15 19:42:22,202 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2024-09-15 19:42:22,202 INFO L434 NwaCegarLoop]: 13 mSDtfsCounter, 45 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:22,206 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 49 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-15 19:42:22,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2024-09-15 19:42:22,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2024-09-15 19:42:22,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 35 states have (on average 1.2) internal successors, (42), 38 states have internal predecessors, (42), 23 states have call successors, (23), 8 states have call predecessors, (23), 7 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2024-09-15 19:42:22,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 84 transitions. [2024-09-15 19:42:22,228 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 84 transitions. Word has length 29 [2024-09-15 19:42:22,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:22,228 INFO L474 AbstractCegarLoop]: Abstraction has 66 states and 84 transitions. [2024-09-15 19:42:22,229 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (12), 5 states have call predecessors, (12), 3 states have call successors, (12) [2024-09-15 19:42:22,229 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:22,229 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 84 transitions. [2024-09-15 19:42:22,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2024-09-15 19:42:22,230 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:22,230 INFO L216 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:22,250 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-09-15 19:42:22,430 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-09-15 19:42:22,431 INFO L399 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:22,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:22,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1437248358, now seen corresponding path program 1 times [2024-09-15 19:42:22,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:22,432 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435185772] [2024-09-15 19:42:22,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:22,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:22,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,585 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-15 19:42:22,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,589 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2024-09-15 19:42:22,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,599 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2024-09-15 19:42:22,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,606 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2024-09-15 19:42:22,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,614 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-15 19:42:22,615 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:22,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435185772] [2024-09-15 19:42:22,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435185772] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-15 19:42:22,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659235483] [2024-09-15 19:42:22,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:22,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:22,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:22,618 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-09-15 19:42:22,620 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-09-15 19:42:22,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-15 19:42:22,667 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-09-15 19:42:22,669 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-15 19:42:22,754 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-15 19:42:22,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-15 19:42:22,816 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-09-15 19:42:22,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659235483] provided 1 perfect and 1 imperfect interpolant sequences [2024-09-15 19:42:22,817 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-09-15 19:42:22,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 6] total 10 [2024-09-15 19:42:22,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407081371] [2024-09-15 19:42:22,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-15 19:42:22,818 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-09-15 19:42:22,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:22,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-09-15 19:42:22,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2024-09-15 19:42:22,819 INFO L87 Difference]: Start difference. First operand 66 states and 84 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2024-09-15 19:42:22,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:22,915 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2024-09-15 19:42:22,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-09-15 19:42:22,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2024-09-15 19:42:22,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:22,917 INFO L225 Difference]: With dead ends: 80 [2024-09-15 19:42:22,917 INFO L226 Difference]: Without dead ends: 78 [2024-09-15 19:42:22,917 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2024-09-15 19:42:22,918 INFO L434 NwaCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:22,918 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 66 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-15 19:42:22,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2024-09-15 19:42:22,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2024-09-15 19:42:22,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 47 states have internal predecessors, (51), 23 states have call successors, (23), 11 states have call predecessors, (23), 10 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2024-09-15 19:42:22,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2024-09-15 19:42:22,936 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 29 [2024-09-15 19:42:22,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:22,936 INFO L474 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2024-09-15 19:42:22,937 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2024-09-15 19:42:22,937 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:22,937 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2024-09-15 19:42:22,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-09-15 19:42:22,938 INFO L208 NwaCegarLoop]: Found error trace [2024-09-15 19:42:22,938 INFO L216 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:22,954 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-09-15 19:42:23,138 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:23,139 INFO L399 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-15 19:42:23,139 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:23,139 INFO L85 PathProgramCache]: Analyzing trace with hash 857281179, now seen corresponding path program 2 times [2024-09-15 19:42:23,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-15 19:42:23,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893528628] [2024-09-15 19:42:23,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-15 19:42:23,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-15 19:42:23,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-15 19:42:23,158 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2146366434] [2024-09-15 19:42:23,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-09-15 19:42:23,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-15 19:42:23,159 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-15 19:42:23,160 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-09-15 19:42:23,162 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-09-15 19:42:23,213 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-09-15 19:42:23,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-15 19:42:23,215 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-09-15 19:42:23,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-15 19:42:23,322 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 7 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-09-15 19:42:23,322 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-15 19:42:23,474 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-09-15 19:42:23,474 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-15 19:42:23,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893528628] [2024-09-15 19:42:23,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-15 19:42:23,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146366434] [2024-09-15 19:42:23,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146366434] provided 0 perfect and 2 imperfect interpolant sequences [2024-09-15 19:42:23,475 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-09-15 19:42:23,475 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2024-09-15 19:42:23,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414823521] [2024-09-15 19:42:23,476 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-09-15 19:42:23,476 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-09-15 19:42:23,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-15 19:42:23,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-09-15 19:42:23,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2024-09-15 19:42:23,478 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2024-09-15 19:42:23,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-15 19:42:23,672 INFO L93 Difference]: Finished difference Result 78 states and 93 transitions. [2024-09-15 19:42:23,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-09-15 19:42:23,673 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) Word has length 34 [2024-09-15 19:42:23,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-15 19:42:23,674 INFO L225 Difference]: With dead ends: 78 [2024-09-15 19:42:23,675 INFO L226 Difference]: Without dead ends: 0 [2024-09-15 19:42:23,676 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2024-09-15 19:42:23,677 INFO L434 NwaCegarLoop]: 19 mSDtfsCounter, 15 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-15 19:42:23,677 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 143 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-15 19:42:23,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2024-09-15 19:42:23,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2024-09-15 19:42:23,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-09-15 19:42:23,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2024-09-15 19:42:23,678 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 34 [2024-09-15 19:42:23,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-15 19:42:23,678 INFO L474 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2024-09-15 19:42:23,678 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2024-09-15 19:42:23,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-15 19:42:23,680 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2024-09-15 19:42:23,680 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2024-09-15 19:42:23,682 INFO L785 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2024-09-15 19:42:23,698 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-09-15 19:42:23,886 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-09-15 19:42:23,889 INFO L408 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1, 1, 1] [2024-09-15 19:42:23,892 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2024-09-15 19:42:24,542 INFO L165 ceAbstractionStarter]: Computing trace abstraction results [2024-09-15 19:42:24,564 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.09 07:42:24 BoogieIcfgContainer [2024-09-15 19:42:24,564 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2024-09-15 19:42:24,565 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2024-09-15 19:42:24,565 INFO L270 PluginConnector]: Initializing Witness Printer... [2024-09-15 19:42:24,565 INFO L274 PluginConnector]: Witness Printer initialized [2024-09-15 19:42:24,565 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.09 07:42:19" (3/4) ... [2024-09-15 19:42:24,568 INFO L139 WitnessPrinter]: Generating witness for correct program [2024-09-15 19:42:24,571 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2024-09-15 19:42:24,572 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2024-09-15 19:42:24,572 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2024-09-15 19:42:24,576 INFO L896 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2024-09-15 19:42:24,576 INFO L896 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2024-09-15 19:42:24,576 INFO L896 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2024-09-15 19:42:24,576 INFO L896 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2024-09-15 19:42:24,596 WARN L216 nessWitnessGenerator]: Not writing invariant because ACSL is forbidden: (((((((__int128) a * 2) + ((__int128) a * a)) + 1) == s) && (\old(counter) == 0)) && (t == (((__int128) a * 2) + 1))) [2024-09-15 19:42:24,650 INFO L149 WitnessManager]: Wrote witness to /storage/repos/certificate-witnesses-artifact/automizer/witness.graphml [2024-09-15 19:42:24,651 INFO L149 WitnessManager]: Wrote witness to /storage/repos/certificate-witnesses-artifact/automizer/witness.yml [2024-09-15 19:42:24,651 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2024-09-15 19:42:24,651 INFO L158 Benchmark]: Toolchain (without parser) took 5730.39ms. Allocated memory was 56.6MB in the beginning and 88.1MB in the end (delta: 31.5MB). Free memory was 27.1MB in the beginning and 54.2MB in the end (delta: -27.1MB). Peak memory consumption was 5.7MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,651 INFO L158 Benchmark]: CDTParser took 1.32ms. Allocated memory is still 44.0MB. Free memory was 20.4MB in the beginning and 20.4MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. [2024-09-15 19:42:24,652 INFO L158 Benchmark]: CACSL2BoogieTranslator took 239.21ms. Allocated memory is still 56.6MB. Free memory was 26.9MB in the beginning and 29.2MB in the end (delta: -2.3MB). Peak memory consumption was 7.0MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,652 INFO L158 Benchmark]: Boogie Procedure Inliner took 20.47ms. Allocated memory is still 56.6MB. Free memory was 29.2MB in the beginning and 28.1MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2024-09-15 19:42:24,652 INFO L158 Benchmark]: Boogie Preprocessor took 49.01ms. Allocated memory is still 56.6MB. Free memory was 28.1MB in the beginning and 26.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,653 INFO L158 Benchmark]: RCFGBuilder took 374.83ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 26.3MB in the beginning and 44.6MB in the end (delta: -18.2MB). Peak memory consumption was 5.6MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,653 INFO L158 Benchmark]: TraceAbstraction took 4955.34ms. Allocated memory was 73.4MB in the beginning and 88.1MB in the end (delta: 14.7MB). Free memory was 43.9MB in the beginning and 58.4MB in the end (delta: -14.5MB). Peak memory consumption was 31.4MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,653 INFO L158 Benchmark]: Witness Printer took 86.00ms. Allocated memory is still 88.1MB. Free memory was 58.4MB in the beginning and 54.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2024-09-15 19:42:24,656 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.32ms. Allocated memory is still 44.0MB. Free memory was 20.4MB in the beginning and 20.4MB in the end (delta: 42.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 239.21ms. Allocated memory is still 56.6MB. Free memory was 26.9MB in the beginning and 29.2MB in the end (delta: -2.3MB). Peak memory consumption was 7.0MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 20.47ms. Allocated memory is still 56.6MB. Free memory was 29.2MB in the beginning and 28.1MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 49.01ms. Allocated memory is still 56.6MB. Free memory was 28.1MB in the beginning and 26.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 374.83ms. Allocated memory was 56.6MB in the beginning and 73.4MB in the end (delta: 16.8MB). Free memory was 26.3MB in the beginning and 44.6MB in the end (delta: -18.2MB). Peak memory consumption was 5.6MB. Max. memory is 16.1GB. * TraceAbstraction took 4955.34ms. Allocated memory was 73.4MB in the beginning and 88.1MB in the end (delta: 14.7MB). Free memory was 43.9MB in the beginning and 58.4MB in the end (delta: -14.5MB). Peak memory consumption was 31.4MB. Max. memory is 16.1GB. * Witness Printer took 86.00ms. Allocated memory is still 88.1MB. Free memory was 58.4MB in the beginning and 54.2MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 14]: a call to reach_error is unreachable For all program executions holds that a call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 4.2s, OverallIterations: 8, TraceHistogramMax: 5, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 119 SdHoareTripleChecker+Valid, 0.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 98 mSDsluCounter, 554 SdHoareTripleChecker+Invalid, 0.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 397 mSDsCounter, 99 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 449 IncrementalHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 99 mSolverCounterUnsat, 157 mSDtfsCounter, 449 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 279 GetRequests, 219 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=7, InterpolantAutomatonStates: 53, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 290 NumberOfCodeBlocks, 290 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 298 ConstructedInterpolants, 0 QuantifiedInterpolants, 912 SizeOfPredicates, 7 NumberOfNonLiveVariables, 433 ConjunctsInSsa, 55 ConjunctsInUnsatCore, 13 InterpolantComputations, 6 PerfectInterpolantSequences, 168/205 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: (((((((__int128) a * 2) + ((__int128) a * a)) + 1) == s) && (\old(counter) == 0)) && (t == (((__int128) a * 2) + 1))) - ProcedureContractResult [Line: 21]: Procedure Contract for main Derived contract for procedure main. Requires: (counter == 0) Ensures: (\old(counter) == 0) - ProcedureContractResult [Line: 11]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert. Requires: (\old(cond) != 0) Ensures: (\old(cond) != 0) RESULT: Ultimate proved your program to be correct! [2024-09-15 19:42:24,675 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE