/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml -i ../sv-benchmarks/c/array-examples/standard_partition_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 18:32:07,646 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 18:32:07,649 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 18:32:07,693 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-04-01 18:32:07,741 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 18:32:07,742 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 18:32:07,742 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 18:32:07,746 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2023-04-01 18:32:07,776 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 18:32:07,776 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 18:32:07,776 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 18:32:07,777 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 18:32:07,778 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 18:32:07,778 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 18:32:07,779 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-04-01 18:32:07,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-04-01 18:32:07,779 INFO L138 SettingsManager]: * Use SBE=true [2023-04-01 18:32:07,779 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 18:32:07,780 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 18:32:07,781 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 18:32:07,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 18:32:07,781 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-04-01 18:32:07,782 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 18:32:07,783 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-04-01 18:32:07,783 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-04-01 18:32:07,783 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-04-01 18:32:07,783 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2023-04-01 18:32:08,026 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 18:32:08,046 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 18:32:08,048 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 18:32:08,049 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 18:32:08,050 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 18:32:08,051 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_partition_ground-2.i [2023-04-01 18:32:09,209 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 18:32:09,380 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 18:32:09,381 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_partition_ground-2.i [2023-04-01 18:32:09,385 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/327ac6467/72d1cf8436304dfaa0fcc55c39032bc5/FLAG2ff0fb067 [2023-04-01 18:32:09,399 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/327ac6467/72d1cf8436304dfaa0fcc55c39032bc5 [2023-04-01 18:32:09,401 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 18:32:09,402 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 18:32:09,403 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 18:32:09,403 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 18:32:09,408 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 18:32:09,409 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,410 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@544d277d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09, skipping insertion in model container [2023-04-01 18:32:09,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,417 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 18:32:09,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 18:32:09,562 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_partition_ground-2.i[820,833] [2023-04-01 18:32:09,583 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 18:32:09,592 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 18:32:09,607 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_partition_ground-2.i[820,833] [2023-04-01 18:32:09,626 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 18:32:09,638 INFO L208 MainTranslator]: Completed translation [2023-04-01 18:32:09,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09 WrapperNode [2023-04-01 18:32:09,639 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 18:32:09,640 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 18:32:09,640 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 18:32:09,640 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 18:32:09,650 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,650 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,657 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,671 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,677 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,684 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,685 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,686 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 18:32:09,687 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 18:32:09,687 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 18:32:09,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 18:32:09,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (1/1) ... [2023-04-01 18:32:09,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 18:32:09,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:09,723 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 18:32:09,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 18:32:09,764 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 18:32:09,764 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 18:32:09,764 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 18:32:09,764 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 18:32:09,764 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 18:32:09,764 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 18:32:09,764 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 18:32:09,765 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 18:32:09,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 18:32:09,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 18:32:09,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 18:32:09,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 18:32:09,827 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 18:32:09,828 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 18:32:09,947 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 18:32:09,952 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 18:32:09,953 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 18:32:09,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:32:09 BoogieIcfgContainer [2023-04-01 18:32:09,955 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 18:32:09,956 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 18:32:09,956 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 18:32:09,959 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 18:32:09,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 06:32:09" (1/3) ... [2023-04-01 18:32:09,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61dde2ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:32:09, skipping insertion in model container [2023-04-01 18:32:09,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:32:09" (2/3) ... [2023-04-01 18:32:09,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61dde2ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:32:09, skipping insertion in model container [2023-04-01 18:32:09,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:32:09" (3/3) ... [2023-04-01 18:32:09,961 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_partition_ground-2.i [2023-04-01 18:32:10,000 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 18:32:10,001 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 18:32:10,066 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 18:32:10,073 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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;@1201f5d8, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-04-01 18:32:10,073 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 18:32:10,077 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 18:32:10,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 18:32:10,083 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:10,083 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:10,084 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:10,088 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:10,089 INFO L85 PathProgramCache]: Analyzing trace with hash -561863510, now seen corresponding path program 1 times [2023-04-01 18:32:10,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:10,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255716935] [2023-04-01 18:32:10,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:10,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:10,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:10,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 18:32:10,286 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:10,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255716935] [2023-04-01 18:32:10,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255716935] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 18:32:10,287 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 18:32:10,287 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 18:32:10,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479088907] [2023-04-01 18:32:10,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 18:32:10,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 18:32:10,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:10,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 18:32:10,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 18:32:10,337 INFO L87 Difference]: Start difference. First operand has 31 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2023-04-01 18:32:10,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:10,465 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2023-04-01 18:32:10,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 18:32:10,472 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 16 [2023-04-01 18:32:10,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:10,477 INFO L225 Difference]: With dead ends: 54 [2023-04-01 18:32:10,477 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 18:32:10,479 INFO L412 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 [2023-04-01 18:32:10,483 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 28 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:10,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 10 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 18:32:10,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 18:32:10,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-01 18:32:10,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:10,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2023-04-01 18:32:10,518 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2023-04-01 18:32:10,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:10,518 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2023-04-01 18:32:10,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2023-04-01 18:32:10,519 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2023-04-01 18:32:10,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 18:32:10,520 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:10,520 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:10,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 18:32:10,520 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:10,521 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:10,521 INFO L85 PathProgramCache]: Analyzing trace with hash 2146741530, now seen corresponding path program 1 times [2023-04-01 18:32:10,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:10,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184314381] [2023-04-01 18:32:10,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:10,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:10,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:10,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 18:32:10,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:10,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184314381] [2023-04-01 18:32:10,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184314381] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 18:32:10,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 18:32:10,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 18:32:10,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317459719] [2023-04-01 18:32:10,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 18:32:10,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 18:32:10,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:10,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 18:32:10,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 18:32:10,615 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2023-04-01 18:32:10,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:10,681 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2023-04-01 18:32:10,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 18:32:10,682 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 16 [2023-04-01 18:32:10,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:10,683 INFO L225 Difference]: With dead ends: 46 [2023-04-01 18:32:10,684 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 18:32:10,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-01 18:32:10,686 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 28 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:10,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 12 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 18:32:10,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 18:32:10,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2023-04-01 18:32:10,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:10,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2023-04-01 18:32:10,695 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2023-04-01 18:32:10,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:10,695 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2023-04-01 18:32:10,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2023-04-01 18:32:10,696 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2023-04-01 18:32:10,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 18:32:10,696 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:10,696 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:10,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 18:32:10,697 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:10,697 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:10,698 INFO L85 PathProgramCache]: Analyzing trace with hash 347717308, now seen corresponding path program 1 times [2023-04-01 18:32:10,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:10,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556752054] [2023-04-01 18:32:10,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:10,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:10,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:10,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 18:32:10,795 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:10,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556752054] [2023-04-01 18:32:10,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556752054] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 18:32:10,795 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 18:32:10,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 18:32:10,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212770347] [2023-04-01 18:32:10,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 18:32:10,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 18:32:10,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:10,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 18:32:10,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 18:32:10,798 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2023-04-01 18:32:10,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:10,893 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2023-04-01 18:32:10,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 18:32:10,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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 18 [2023-04-01 18:32:10,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:10,894 INFO L225 Difference]: With dead ends: 48 [2023-04-01 18:32:10,895 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 18:32:10,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-01 18:32:10,896 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 39 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:10,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 12 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 18:32:10,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 18:32:10,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2023-04-01 18:32:10,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:10,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2023-04-01 18:32:10,904 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 18 [2023-04-01 18:32:10,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:10,904 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2023-04-01 18:32:10,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 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) [2023-04-01 18:32:10,904 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2023-04-01 18:32:10,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 18:32:10,905 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:10,905 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:10,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 18:32:10,905 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:10,906 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:10,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1595161568, now seen corresponding path program 1 times [2023-04-01 18:32:10,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:10,907 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026353267] [2023-04-01 18:32:10,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:10,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:10,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:11,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:11,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 18:32:11,049 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:11,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026353267] [2023-04-01 18:32:11,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026353267] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:11,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259218130] [2023-04-01 18:32:11,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:11,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:11,050 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:11,053 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:11,069 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 18:32:11,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:11,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 18:32:11,121 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:11,161 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 18:32:11,161 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:11,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 18:32:11,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259218130] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:11,191 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:11,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2023-04-01 18:32:11,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940635337] [2023-04-01 18:32:11,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:11,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 18:32:11,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:11,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 18:32:11,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-04-01 18:32:11,194 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:11,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:11,318 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2023-04-01 18:32:11,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 18:32:11,318 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-04-01 18:32:11,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:11,319 INFO L225 Difference]: With dead ends: 55 [2023-04-01 18:32:11,320 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 18:32:11,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2023-04-01 18:32:11,331 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 34 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:11,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 22 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 18:32:11,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 18:32:11,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-01 18:32:11,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:11,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2023-04-01 18:32:11,342 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 24 [2023-04-01 18:32:11,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:11,342 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2023-04-01 18:32:11,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:11,343 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2023-04-01 18:32:11,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 18:32:11,343 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:11,344 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:11,351 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 18:32:11,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:11,545 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:11,546 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:11,546 INFO L85 PathProgramCache]: Analyzing trace with hash -2143213242, now seen corresponding path program 2 times [2023-04-01 18:32:11,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:11,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538902891] [2023-04-01 18:32:11,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:11,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:11,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:11,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:11,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:11,692 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-01 18:32:11,692 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:11,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538902891] [2023-04-01 18:32:11,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538902891] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:11,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953674262] [2023-04-01 18:32:11,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-04-01 18:32:11,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:11,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:11,694 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:11,703 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 18:32:11,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2023-04-01 18:32:11,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:32:11,766 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 18:32:11,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:11,835 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 18:32:11,835 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 18:32:11,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953674262] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 18:32:11,836 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 18:32:11,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2023-04-01 18:32:11,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240617765] [2023-04-01 18:32:11,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 18:32:11,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 18:32:11,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:11,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 18:32:11,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-04-01 18:32:11,840 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:11,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:11,859 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2023-04-01 18:32:11,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 18:32:11,860 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2023-04-01 18:32:11,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:11,863 INFO L225 Difference]: With dead ends: 55 [2023-04-01 18:32:11,863 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 18:32:11,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-04-01 18:32:11,864 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:11,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 68 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 18:32:11,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 18:32:11,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2023-04-01 18:32:11,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:11,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2023-04-01 18:32:11,881 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 30 [2023-04-01 18:32:11,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:11,881 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2023-04-01 18:32:11,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:11,882 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2023-04-01 18:32:11,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 18:32:11,883 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:11,883 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:11,891 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:12,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:12,088 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:12,089 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:12,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1132095992, now seen corresponding path program 1 times [2023-04-01 18:32:12,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:12,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194866633] [2023-04-01 18:32:12,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:12,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:12,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:12,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:12,214 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-04-01 18:32:12,214 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:12,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194866633] [2023-04-01 18:32:12,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194866633] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:12,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146427581] [2023-04-01 18:32:12,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:12,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:12,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:12,217 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:12,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 18:32:12,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:12,283 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 18:32:12,288 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 18:32:12,346 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:12,423 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 18:32:12,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146427581] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:12,424 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:12,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2023-04-01 18:32:12,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247512566] [2023-04-01 18:32:12,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:12,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 18:32:12,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:12,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 18:32:12,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2023-04-01 18:32:12,427 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:12,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:12,701 INFO L93 Difference]: Finished difference Result 86 states and 110 transitions. [2023-04-01 18:32:12,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 18:32:12,703 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2023-04-01 18:32:12,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:12,705 INFO L225 Difference]: With dead ends: 86 [2023-04-01 18:32:12,705 INFO L226 Difference]: Without dead ends: 64 [2023-04-01 18:32:12,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=449, Unknown=0, NotChecked=0, Total=702 [2023-04-01 18:32:12,707 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 72 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:12,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 32 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 18:32:12,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-01 18:32:12,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2023-04-01 18:32:12,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:12,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2023-04-01 18:32:12,715 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 30 [2023-04-01 18:32:12,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:12,716 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2023-04-01 18:32:12,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:12,716 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2023-04-01 18:32:12,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-01 18:32:12,717 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:12,717 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:12,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:12,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:12,924 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:12,924 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:12,924 INFO L85 PathProgramCache]: Analyzing trace with hash -2132878100, now seen corresponding path program 1 times [2023-04-01 18:32:12,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:12,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835486415] [2023-04-01 18:32:12,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:12,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:13,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:13,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:13,178 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:13,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:13,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835486415] [2023-04-01 18:32:13,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835486415] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:13,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868816998] [2023-04-01 18:32:13,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:13,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:13,179 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:13,180 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:13,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 18:32:13,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:13,272 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 18:32:13,283 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:13,332 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:13,332 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:13,549 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:13,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868816998] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:13,549 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:13,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2023-04-01 18:32:13,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303976223] [2023-04-01 18:32:13,550 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:13,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 18:32:13,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:13,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 18:32:13,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2023-04-01 18:32:13,551 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:13,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:13,982 INFO L93 Difference]: Finished difference Result 109 states and 136 transitions. [2023-04-01 18:32:13,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-01 18:32:13,983 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2023-04-01 18:32:13,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:13,984 INFO L225 Difference]: With dead ends: 109 [2023-04-01 18:32:13,984 INFO L226 Difference]: Without dead ends: 80 [2023-04-01 18:32:13,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=853, Invalid=1403, Unknown=0, NotChecked=0, Total=2256 [2023-04-01 18:32:13,986 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 70 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:13,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 22 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 18:32:13,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-04-01 18:32:13,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-04-01 18:32:13,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.1216216216216217) internal successors, (83), 74 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:13,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2023-04-01 18:32:13,995 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 48 [2023-04-01 18:32:13,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:13,996 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2023-04-01 18:32:13,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:13,996 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2023-04-01 18:32:13,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-01 18:32:13,997 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:13,997 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:14,003 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:14,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:14,198 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:14,198 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:14,198 INFO L85 PathProgramCache]: Analyzing trace with hash -410849404, now seen corresponding path program 2 times [2023-04-01 18:32:14,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:14,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467277686] [2023-04-01 18:32:14,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:14,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:14,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:14,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:14,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:14,818 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:14,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:14,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467277686] [2023-04-01 18:32:14,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467277686] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:14,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460126384] [2023-04-01 18:32:14,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-04-01 18:32:14,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:14,819 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:14,821 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:14,843 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 18:32:14,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-04-01 18:32:14,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:32:14,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 18:32:14,944 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:15,023 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:15,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:15,733 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:15,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1460126384] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:15,733 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:15,733 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 50 [2023-04-01 18:32:15,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687595191] [2023-04-01 18:32:15,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:15,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-04-01 18:32:15,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:15,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-04-01 18:32:15,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2023-04-01 18:32:15,737 INFO L87 Difference]: Start difference. First operand 80 states and 88 transitions. Second operand has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:16,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:16,903 INFO L93 Difference]: Finished difference Result 157 states and 196 transitions. [2023-04-01 18:32:16,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-04-01 18:32:16,903 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2023-04-01 18:32:16,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:16,904 INFO L225 Difference]: With dead ends: 157 [2023-04-01 18:32:16,905 INFO L226 Difference]: Without dead ends: 128 [2023-04-01 18:32:16,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1420 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3433, Invalid=5687, Unknown=0, NotChecked=0, Total=9120 [2023-04-01 18:32:16,910 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 118 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:16,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 27 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 18:32:16,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-04-01 18:32:16,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2023-04-01 18:32:16,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 122 states have (on average 1.0737704918032787) internal successors, (131), 122 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:16,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 136 transitions. [2023-04-01 18:32:16,927 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 136 transitions. Word has length 72 [2023-04-01 18:32:16,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:16,928 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 136 transitions. [2023-04-01 18:32:16,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:16,928 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 136 transitions. [2023-04-01 18:32:16,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-04-01 18:32:16,934 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:16,934 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:16,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:17,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:17,141 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:17,142 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:17,142 INFO L85 PathProgramCache]: Analyzing trace with hash -110478156, now seen corresponding path program 3 times [2023-04-01 18:32:17,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:17,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893469587] [2023-04-01 18:32:17,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:17,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:17,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:18,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:18,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:18,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 18:32:18,969 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:18,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893469587] [2023-04-01 18:32:18,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893469587] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:18,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708767740] [2023-04-01 18:32:18,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 18:32:18,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:18,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:18,973 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:18,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 18:32:19,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 18:32:19,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:32:19,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 18:32:19,097 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:19,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2121 trivial. 0 not checked. [2023-04-01 18:32:19,287 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2121 trivial. 0 not checked. [2023-04-01 18:32:19,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708767740] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:19,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:19,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 5, 5] total 56 [2023-04-01 18:32:19,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281254365] [2023-04-01 18:32:19,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:19,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-04-01 18:32:19,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:19,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-04-01 18:32:19,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=1875, Unknown=0, NotChecked=0, Total=3080 [2023-04-01 18:32:19,482 INFO L87 Difference]: Start difference. First operand 128 states and 136 transitions. Second operand has 56 states, 56 states have (on average 2.392857142857143) internal successors, (134), 55 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:21,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:21,197 INFO L93 Difference]: Finished difference Result 198 states and 234 transitions. [2023-04-01 18:32:21,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-04-01 18:32:21,198 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.392857142857143) internal successors, (134), 55 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2023-04-01 18:32:21,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:21,199 INFO L225 Difference]: With dead ends: 198 [2023-04-01 18:32:21,199 INFO L226 Difference]: Without dead ends: 169 [2023-04-01 18:32:21,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1701 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=4173, Invalid=7599, Unknown=0, NotChecked=0, Total=11772 [2023-04-01 18:32:21,202 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 209 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:21,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 57 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 18:32:21,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2023-04-01 18:32:21,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 166. [2023-04-01 18:32:21,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 160 states have (on average 1.13125) internal successors, (181), 160 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:21,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 186 transitions. [2023-04-01 18:32:21,215 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 186 transitions. Word has length 120 [2023-04-01 18:32:21,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:21,215 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 186 transitions. [2023-04-01 18:32:21,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.392857142857143) internal successors, (134), 55 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:21,216 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 186 transitions. [2023-04-01 18:32:21,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-04-01 18:32:21,217 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:21,217 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:21,229 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:21,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:21,429 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:21,430 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:21,430 INFO L85 PathProgramCache]: Analyzing trace with hash 250678614, now seen corresponding path program 4 times [2023-04-01 18:32:21,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:21,430 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599028018] [2023-04-01 18:32:21,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:21,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:21,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:23,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:23,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:23,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2311 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-04-01 18:32:23,170 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:23,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599028018] [2023-04-01 18:32:23,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599028018] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:23,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033783328] [2023-04-01 18:32:23,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 18:32:23,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:23,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:23,177 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:23,197 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 18:32:23,369 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 18:32:23,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:32:23,373 INFO L262 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 18:32:23,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:32:23,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2311 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 2260 trivial. 0 not checked. [2023-04-01 18:32:23,548 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:32:23,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2311 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 2260 trivial. 0 not checked. [2023-04-01 18:32:23,765 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1033783328] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:32:23,765 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:32:23,765 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 9, 9] total 65 [2023-04-01 18:32:23,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748759467] [2023-04-01 18:32:23,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:32:23,768 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-04-01 18:32:23,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:32:23,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-04-01 18:32:23,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1346, Invalid=2814, Unknown=0, NotChecked=0, Total=4160 [2023-04-01 18:32:23,771 INFO L87 Difference]: Start difference. First operand 166 states and 186 transitions. Second operand has 65 states, 65 states have (on average 2.5076923076923077) internal successors, (163), 64 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:25,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:32:25,836 INFO L93 Difference]: Finished difference Result 308 states and 388 transitions. [2023-04-01 18:32:25,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2023-04-01 18:32:25,837 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.5076923076923077) internal successors, (163), 64 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2023-04-01 18:32:25,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:32:25,838 INFO L225 Difference]: With dead ends: 308 [2023-04-01 18:32:25,838 INFO L226 Difference]: Without dead ends: 243 [2023-04-01 18:32:25,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2611 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=5376, Invalid=10626, Unknown=0, NotChecked=0, Total=16002 [2023-04-01 18:32:25,843 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 538 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 539 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 18:32:25,843 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [539 Valid, 52 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 18:32:25,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2023-04-01 18:32:25,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 240. [2023-04-01 18:32:25,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 234 states have (on average 1.1923076923076923) internal successors, (279), 234 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:32:25,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 284 transitions. [2023-04-01 18:32:25,859 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 284 transitions. Word has length 146 [2023-04-01 18:32:25,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:32:25,859 INFO L495 AbstractCegarLoop]: Abstraction has 240 states and 284 transitions. [2023-04-01 18:32:25,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.5076923076923077) internal successors, (163), 64 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:32:25,859 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 284 transitions. [2023-04-01 18:32:25,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2023-04-01 18:32:25,861 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:32:25,861 INFO L195 NwaCegarLoop]: trace histogram [48, 48, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:32:25,869 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 18:32:26,069 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:26,070 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:32:26,070 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:32:26,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1550990216, now seen corresponding path program 5 times [2023-04-01 18:32:26,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:32:26,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209164921] [2023-04-01 18:32:26,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:32:26,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:32:26,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:27,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:32:27,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:32:27,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2878 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2023-04-01 18:32:27,898 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:32:27,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209164921] [2023-04-01 18:32:27,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209164921] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:32:27,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335383229] [2023-04-01 18:32:27,898 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-04-01 18:32:27,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:32:27,898 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:32:27,901 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:32:27,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 18:33:18,802 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2023-04-01 18:33:18,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:33:18,834 INFO L262 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 18:33:18,838 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:33:19,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2878 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 2591 trivial. 0 not checked. [2023-04-01 18:33:19,326 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:33:19,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2878 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 2591 trivial. 0 not checked. [2023-04-01 18:33:19,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335383229] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:33:19,959 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:33:19,959 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 17, 17] total 82 [2023-04-01 18:33:19,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375308246] [2023-04-01 18:33:19,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:33:19,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2023-04-01 18:33:19,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:33:19,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2023-04-01 18:33:19,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=4870, Unknown=0, NotChecked=0, Total=6642 [2023-04-01 18:33:19,964 INFO L87 Difference]: Start difference. First operand 240 states and 284 transitions. Second operand has 82 states, 82 states have (on average 2.5609756097560976) internal successors, (210), 81 states have internal predecessors, (210), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:22,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:33:22,920 INFO L93 Difference]: Finished difference Result 526 states and 694 transitions. [2023-04-01 18:33:22,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2023-04-01 18:33:22,920 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.5609756097560976) internal successors, (210), 81 states have internal predecessors, (210), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 196 [2023-04-01 18:33:22,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:33:22,922 INFO L225 Difference]: With dead ends: 526 [2023-04-01 18:33:22,922 INFO L226 Difference]: Without dead ends: 389 [2023-04-01 18:33:22,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4660 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=8250, Invalid=17510, Unknown=0, NotChecked=0, Total=25760 [2023-04-01 18:33:22,929 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 683 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 18:33:22,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [684 Valid, 47 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 18:33:22,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2023-04-01 18:33:22,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 386. [2023-04-01 18:33:22,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 380 states have (on average 1.2447368421052631) internal successors, (473), 380 states have internal predecessors, (473), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 18:33:22,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 478 transitions. [2023-04-01 18:33:22,949 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 478 transitions. Word has length 196 [2023-04-01 18:33:22,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:33:22,949 INFO L495 AbstractCegarLoop]: Abstraction has 386 states and 478 transitions. [2023-04-01 18:33:22,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.5609756097560976) internal successors, (210), 81 states have internal predecessors, (210), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:22,950 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 478 transitions. [2023-04-01 18:33:22,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2023-04-01 18:33:22,953 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:33:22,953 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 30, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:33:22,974 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 18:33:23,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-01 18:33:23,169 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:33:23,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:33:23,170 INFO L85 PathProgramCache]: Analyzing trace with hash -455688934, now seen corresponding path program 6 times [2023-04-01 18:33:23,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:33:23,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618183420] [2023-04-01 18:33:23,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:33:23,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:33:23,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:25,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:33:25,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:25,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5071 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:25,364 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:33:25,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618183420] [2023-04-01 18:33:25,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618183420] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:33:25,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965543382] [2023-04-01 18:33:25,364 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-04-01 18:33:25,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:33:25,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:33:25,366 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:33:25,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 18:33:25,553 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2023-04-01 18:33:25,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:33:25,555 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 18:33:25,561 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:33:25,852 INFO L321 Elim1Store]: treesize reduction 25, result has 47.9 percent of original size [2023-04-01 18:33:25,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 37 [2023-04-01 18:33:26,041 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 18:33:26,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5071 backedges. 29 proven. 59 refuted. 0 times theorem prover too weak. 4983 trivial. 0 not checked. [2023-04-01 18:33:26,113 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:33:26,475 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 18:33:26,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 39 [2023-04-01 18:33:26,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-04-01 18:33:26,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2023-04-01 18:33:26,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5071 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 4983 trivial. 0 not checked. [2023-04-01 18:33:26,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965543382] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:33:26,684 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:33:26,684 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 9, 9] total 64 [2023-04-01 18:33:26,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961801826] [2023-04-01 18:33:26,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:33:26,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2023-04-01 18:33:26,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:33:26,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2023-04-01 18:33:26,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1356, Invalid=2676, Unknown=0, NotChecked=0, Total=4032 [2023-04-01 18:33:26,689 INFO L87 Difference]: Start difference. First operand 386 states and 478 transitions. Second operand has 64 states, 63 states have (on average 2.2857142857142856) internal successors, (144), 61 states have internal predecessors, (144), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:28,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:33:28,765 INFO L93 Difference]: Finished difference Result 861 states and 1107 transitions. [2023-04-01 18:33:28,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-04-01 18:33:28,765 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.2857142857142856) internal successors, (144), 61 states have internal predecessors, (144), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 294 [2023-04-01 18:33:28,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:33:28,769 INFO L225 Difference]: With dead ends: 861 [2023-04-01 18:33:28,769 INFO L226 Difference]: Without dead ends: 580 [2023-04-01 18:33:28,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 578 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2370 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4155, Invalid=10607, Unknown=0, NotChecked=0, Total=14762 [2023-04-01 18:33:28,772 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 165 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 18:33:28,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 73 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 18:33:28,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2023-04-01 18:33:28,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 573. [2023-04-01 18:33:28,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 573 states, 565 states have (on average 1.2707964601769912) internal successors, (718), 566 states have internal predecessors, (718), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 18:33:28,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 725 transitions. [2023-04-01 18:33:28,806 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 725 transitions. Word has length 294 [2023-04-01 18:33:28,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:33:28,806 INFO L495 AbstractCegarLoop]: Abstraction has 573 states and 725 transitions. [2023-04-01 18:33:28,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.2857142857142856) internal successors, (144), 61 states have internal predecessors, (144), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:28,806 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 725 transitions. [2023-04-01 18:33:28,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2023-04-01 18:33:28,810 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:33:28,810 INFO L195 NwaCegarLoop]: trace histogram [50, 50, 30, 30, 30, 30, 30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:33:28,820 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 18:33:29,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:33:29,016 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:33:29,016 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:33:29,016 INFO L85 PathProgramCache]: Analyzing trace with hash -220932226, now seen corresponding path program 7 times [2023-04-01 18:33:29,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:33:29,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795355126] [2023-04-01 18:33:29,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:33:29,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:33:29,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:31,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:33:31,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:31,077 INFO L134 CoverageAnalysis]: Checked inductivity of 5170 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:31,077 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:33:31,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795355126] [2023-04-01 18:33:31,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795355126] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:33:31,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712525251] [2023-04-01 18:33:31,077 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 18:33:31,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:33:31,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:33:31,079 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:33:31,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 18:33:31,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:31,343 INFO L262 TraceCheckSpWp]: Trace formula consists of 1062 conjuncts, 52 conjunts are in the unsatisfiable core [2023-04-01 18:33:31,347 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:33:31,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5170 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:31,501 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:33:34,172 INFO L134 CoverageAnalysis]: Checked inductivity of 5170 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:34,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712525251] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:33:34,172 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:33:34,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 106 [2023-04-01 18:33:34,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073826331] [2023-04-01 18:33:34,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:33:34,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2023-04-01 18:33:34,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:33:34,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2023-04-01 18:33:34,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5462, Invalid=5668, Unknown=0, NotChecked=0, Total=11130 [2023-04-01 18:33:34,177 INFO L87 Difference]: Start difference. First operand 573 states and 725 transitions. Second operand has 106 states, 106 states have (on average 2.1226415094339623) internal successors, (225), 105 states have internal predecessors, (225), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:37,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:33:37,979 INFO L93 Difference]: Finished difference Result 1143 states and 1498 transitions. [2023-04-01 18:33:37,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2023-04-01 18:33:37,979 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.1226415094339623) internal successors, (225), 105 states have internal predecessors, (225), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 296 [2023-04-01 18:33:37,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:33:37,983 INFO L225 Difference]: With dead ends: 1143 [2023-04-01 18:33:37,983 INFO L226 Difference]: Without dead ends: 677 [2023-04-01 18:33:37,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 542 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6726 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=16173, Invalid=26883, Unknown=0, NotChecked=0, Total=43056 [2023-04-01 18:33:37,989 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 230 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 18:33:37,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 32 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 18:33:37,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2023-04-01 18:33:38,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 677. [2023-04-01 18:33:38,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 677 states, 669 states have (on average 1.2286995515695067) internal successors, (822), 670 states have internal predecessors, (822), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 18:33:38,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 829 transitions. [2023-04-01 18:33:38,021 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 829 transitions. Word has length 296 [2023-04-01 18:33:38,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:33:38,021 INFO L495 AbstractCegarLoop]: Abstraction has 677 states and 829 transitions. [2023-04-01 18:33:38,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.1226415094339623) internal successors, (225), 105 states have internal predecessors, (225), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:33:38,021 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 829 transitions. [2023-04-01 18:33:38,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2023-04-01 18:33:38,026 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:33:38,027 INFO L195 NwaCegarLoop]: trace histogram [102, 102, 30, 30, 30, 30, 30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:33:38,037 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 18:33:38,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 18:33:38,234 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:33:38,234 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:33:38,235 INFO L85 PathProgramCache]: Analyzing trace with hash 147316070, now seen corresponding path program 8 times [2023-04-01 18:33:38,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:33:38,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317824061] [2023-04-01 18:33:38,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:33:38,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:33:38,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:44,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:33:44,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:33:44,634 INFO L134 CoverageAnalysis]: Checked inductivity of 13074 backedges. 0 proven. 10404 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:44,634 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:33:44,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317824061] [2023-04-01 18:33:44,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317824061] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:33:44,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546119302] [2023-04-01 18:33:44,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-04-01 18:33:44,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:33:44,635 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:33:44,636 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:33:44,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 18:33:44,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-04-01 18:33:44,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:33:45,000 INFO L262 TraceCheckSpWp]: Trace formula consists of 1530 conjuncts, 104 conjunts are in the unsatisfiable core [2023-04-01 18:33:45,005 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:33:45,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13074 backedges. 0 proven. 10404 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:45,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:33:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 13074 backedges. 0 proven. 10404 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:33:55,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546119302] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:33:55,061 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:33:55,061 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 105, 105] total 210 [2023-04-01 18:33:55,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265178047] [2023-04-01 18:33:55,062 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:33:55,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 210 states [2023-04-01 18:33:55,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:33:55,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 210 interpolants. [2023-04-01 18:33:55,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21738, Invalid=22152, Unknown=0, NotChecked=0, Total=43890 [2023-04-01 18:33:55,072 INFO L87 Difference]: Start difference. First operand 677 states and 829 transitions. Second operand has 210 states, 210 states have (on average 2.0619047619047617) internal successors, (433), 209 states have internal predecessors, (433), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:34:09,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:34:09,307 INFO L93 Difference]: Finished difference Result 1351 states and 1758 transitions. [2023-04-01 18:34:09,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2023-04-01 18:34:09,308 INFO L78 Accepts]: Start accepts. Automaton has has 210 states, 210 states have (on average 2.0619047619047617) internal successors, (433), 209 states have internal predecessors, (433), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 400 [2023-04-01 18:34:09,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:34:09,312 INFO L225 Difference]: With dead ends: 1351 [2023-04-01 18:34:09,312 INFO L226 Difference]: Without dead ends: 885 [2023-04-01 18:34:09,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1112 GetRequests, 698 SyntacticMatches, 0 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26980 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=64793, Invalid=107847, Unknown=0, NotChecked=0, Total=172640 [2023-04-01 18:34:09,322 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 438 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 18:34:09,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [439 Valid, 27 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 18:34:09,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 885 states. [2023-04-01 18:34:09,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 885 to 885. [2023-04-01 18:34:09,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 885 states, 877 states have (on average 1.1744583808437856) internal successors, (1030), 878 states have internal predecessors, (1030), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 18:34:09,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 885 states to 885 states and 1037 transitions. [2023-04-01 18:34:09,365 INFO L78 Accepts]: Start accepts. Automaton has 885 states and 1037 transitions. Word has length 400 [2023-04-01 18:34:09,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:34:09,366 INFO L495 AbstractCegarLoop]: Abstraction has 885 states and 1037 transitions. [2023-04-01 18:34:09,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 210 states, 210 states have (on average 2.0619047619047617) internal successors, (433), 209 states have internal predecessors, (433), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:34:09,367 INFO L276 IsEmpty]: Start isEmpty. Operand 885 states and 1037 transitions. [2023-04-01 18:34:09,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2023-04-01 18:34:09,376 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:34:09,376 INFO L195 NwaCegarLoop]: trace histogram [206, 206, 30, 30, 30, 30, 30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:34:09,387 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 18:34:09,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-01 18:34:09,587 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:34:09,588 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:34:09,588 INFO L85 PathProgramCache]: Analyzing trace with hash -165277386, now seen corresponding path program 9 times [2023-04-01 18:34:09,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:34:09,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820902016] [2023-04-01 18:34:09,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:34:09,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:34:09,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:34:33,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:34:33,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:34:33,625 INFO L134 CoverageAnalysis]: Checked inductivity of 45106 backedges. 0 proven. 42436 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:34:33,625 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:34:33,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820902016] [2023-04-01 18:34:33,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820902016] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:34:33,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866760292] [2023-04-01 18:34:33,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 18:34:33,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:34:33,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:34:33,629 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:34:33,643 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 18:34:33,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 18:34:33,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 18:34:33,979 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 15 conjunts are in the unsatisfiable core [2023-04-01 18:34:33,988 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:34:33,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-01 18:34:34,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2023-04-01 18:34:35,501 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 18:34:35,501 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 15 [2023-04-01 18:34:35,777 INFO L134 CoverageAnalysis]: Checked inductivity of 45106 backedges. 29 proven. 147 refuted. 0 times theorem prover too weak. 44930 trivial. 0 not checked. [2023-04-01 18:34:35,777 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 18:34:37,159 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-04-01 18:34:37,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 33 [2023-04-01 18:34:37,740 INFO L134 CoverageAnalysis]: Checked inductivity of 45106 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 44930 trivial. 0 not checked. [2023-04-01 18:34:37,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866760292] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 18:34:37,741 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 18:34:37,741 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [210, 10, 10] total 223 [2023-04-01 18:34:37,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19640231] [2023-04-01 18:34:37,741 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 18:34:37,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 223 states [2023-04-01 18:34:37,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-04-01 18:34:37,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 223 interpolants. [2023-04-01 18:34:37,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21790, Invalid=27716, Unknown=0, NotChecked=0, Total=49506 [2023-04-01 18:34:37,748 INFO L87 Difference]: Start difference. First operand 885 states and 1037 transitions. Second operand has 223 states, 223 states have (on average 2.071748878923767) internal successors, (462), 222 states have internal predecessors, (462), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:35:02,046 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 18:35:02,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 18:35:02,735 INFO L93 Difference]: Finished difference Result 1886 states and 2313 transitions. [2023-04-01 18:35:02,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 224 states. [2023-04-01 18:35:02,735 INFO L78 Accepts]: Start accepts. Automaton has has 223 states, 223 states have (on average 2.071748878923767) internal successors, (462), 222 states have internal predecessors, (462), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 608 [2023-04-01 18:35:02,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 18:35:02,741 INFO L225 Difference]: With dead ends: 1886 [2023-04-01 18:35:02,741 INFO L226 Difference]: Without dead ends: 1420 [2023-04-01 18:35:02,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1203 SyntacticMatches, 2 SemanticMatches, 442 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 27871 ImplicationChecksByTransitivity, 33.9s TimeCoverageRelationStatistics Valid=67720, Invalid=128972, Unknown=0, NotChecked=0, Total=196692 [2023-04-01 18:35:02,755 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 1795 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 28 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1795 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-04-01 18:35:02,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1795 Valid, 59 Invalid, 816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 783 Invalid, 5 Unknown, 0 Unchecked, 4.4s Time] [2023-04-01 18:35:02,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2023-04-01 18:35:02,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1075. [2023-04-01 18:35:02,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1075 states, 1067 states have (on average 1.203373945641987) internal successors, (1284), 1068 states have internal predecessors, (1284), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 18:35:02,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1291 transitions. [2023-04-01 18:35:02,834 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1291 transitions. Word has length 608 [2023-04-01 18:35:02,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 18:35:02,835 INFO L495 AbstractCegarLoop]: Abstraction has 1075 states and 1291 transitions. [2023-04-01 18:35:02,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 223 states, 223 states have (on average 2.071748878923767) internal successors, (462), 222 states have internal predecessors, (462), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 18:35:02,836 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1291 transitions. [2023-04-01 18:35:02,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 611 [2023-04-01 18:35:02,840 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 18:35:02,840 INFO L195 NwaCegarLoop]: trace histogram [207, 207, 30, 30, 30, 30, 29, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 18:35:02,849 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 18:35:03,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-01 18:35:03,047 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 18:35:03,047 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 18:35:03,047 INFO L85 PathProgramCache]: Analyzing trace with hash -251532070, now seen corresponding path program 1 times [2023-04-01 18:35:03,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-04-01 18:35:03,047 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106084655] [2023-04-01 18:35:03,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:35:03,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 18:35:03,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:35:27,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2023-04-01 18:35:27,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:35:27,586 INFO L134 CoverageAnalysis]: Checked inductivity of 45519 backedges. 0 proven. 42849 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:35:27,586 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-04-01 18:35:27,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106084655] [2023-04-01 18:35:27,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106084655] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 18:35:27,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191875761] [2023-04-01 18:35:27,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 18:35:27,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 18:35:27,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 18:35:27,587 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 18:35:27,589 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 18:35:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 18:35:28,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 2470 conjuncts, 209 conjunts are in the unsatisfiable core [2023-04-01 18:35:28,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 18:35:28,757 INFO L134 CoverageAnalysis]: Checked inductivity of 45519 backedges. 0 proven. 42849 refuted. 0 times theorem prover too weak. 2670 trivial. 0 not checked. [2023-04-01 18:35:28,757 INFO L327 TraceCheckSpWp]: Computing backward predicates...