/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/loops-crafted-1/vnew2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 00:24:53,080 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 00:24:53,082 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 00:24:53,100 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-03-31 00:24:53,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 00:24:53,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 00:24:53,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 00:24:53,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 00:24:53,109 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 00:24:53,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 00:24:53,110 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 00:24:53,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 00:24:53,112 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 00:24:53,113 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 00:24:53,114 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 00:24:53,114 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 00:24:53,117 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 00:24:53,122 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 00:24:53,123 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 00:24:53,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 00:24:53,124 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 [2023-03-31 00:24:53,137 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 00:24:53,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 00:24:53,138 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 00:24:53,138 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 00:24:53,138 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 00:24:53,138 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 00:24:53,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-03-31 00:24:53,139 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-03-31 00:24:53,139 INFO L138 SettingsManager]: * Use SBE=true [2023-03-31 00:24:53,139 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 00:24:53,139 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 00:24:53,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 00:24:53,139 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 00:24:53,140 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 00:24:53,141 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 00:24:53,141 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-03-31 00:24:53,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 00:24:53,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 00:24:53,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 00:24:53,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 00:24:53,141 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-03-31 00:24:53,142 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-03-31 00:24:53,142 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2023-03-31 00:24:53,325 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 00:24:53,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 00:24:53,351 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 00:24:53,351 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 00:24:53,353 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 00:24:53,354 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/vnew2.c [2023-03-31 00:24:54,441 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 00:24:54,559 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 00:24:54,560 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/vnew2.c [2023-03-31 00:24:54,563 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53a420b01/09809d816e5d491c88329d26f151d752/FLAGa9c6df5a4 [2023-03-31 00:24:54,572 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53a420b01/09809d816e5d491c88329d26f151d752 [2023-03-31 00:24:54,574 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 00:24:54,575 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 00:24:54,575 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 00:24:54,576 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 00:24:54,578 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 00:24:54,578 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,579 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d11c4b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54, skipping insertion in model container [2023-03-31 00:24:54,579 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,583 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 00:24:54,591 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 00:24:54,699 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/loops-crafted-1/vnew2.c[403,416] [2023-03-31 00:24:54,711 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 00:24:54,720 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 00:24:54,730 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/loops-crafted-1/vnew2.c[403,416] [2023-03-31 00:24:54,732 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 00:24:54,745 INFO L208 MainTranslator]: Completed translation [2023-03-31 00:24:54,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54 WrapperNode [2023-03-31 00:24:54,745 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 00:24:54,746 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 00:24:54,746 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 00:24:54,746 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 00:24:54,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,759 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,760 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,771 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,773 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,777 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,778 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,779 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 00:24:54,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 00:24:54,780 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 00:24:54,780 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 00:24:54,781 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (1/1) ... [2023-03-31 00:24:54,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 00:24:54,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 00:24:54,804 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) [2023-03-31 00:24:54,821 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 [2023-03-31 00:24:54,834 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 00:24:54,834 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 00:24:54,834 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 00:24:54,834 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 00:24:54,835 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 00:24:54,835 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 00:24:54,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 00:24:54,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 00:24:54,836 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 00:24:54,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 00:24:54,877 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 00:24:54,878 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 00:24:54,971 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 00:24:54,991 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 00:24:54,991 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 00:24:54,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 12:24:54 BoogieIcfgContainer [2023-03-31 00:24:54,992 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 00:24:54,993 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 00:24:54,994 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 00:24:54,996 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 00:24:54,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 12:24:54" (1/3) ... [2023-03-31 00:24:54,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7749d62c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 12:24:54, skipping insertion in model container [2023-03-31 00:24:54,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 12:24:54" (2/3) ... [2023-03-31 00:24:54,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7749d62c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 12:24:54, skipping insertion in model container [2023-03-31 00:24:54,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 12:24:54" (3/3) ... [2023-03-31 00:24:54,997 INFO L112 eAbstractionObserver]: Analyzing ICFG vnew2.c [2023-03-31 00:24:55,009 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 00:24:55,009 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 00:24:55,039 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 00:24:55,043 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;@205096cd, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-03-31 00:24:55,043 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 00:24:55,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 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) [2023-03-31 00:24:55,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-03-31 00:24:55,050 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 00:24:55,050 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 00:24:55,051 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 00:24:55,054 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 00:24:55,054 INFO L85 PathProgramCache]: Analyzing trace with hash -818707046, now seen corresponding path program 1 times [2023-03-31 00:24:55,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-03-31 00:24:55,060 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125076442] [2023-03-31 00:24:55,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 00:24:55,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 00:24:55,165 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 00:24:55,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1050132875] [2023-03-31 00:24:55,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 00:24:55,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 00:24:55,166 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 00:24:55,168 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) [2023-03-31 00:24:55,169 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 00:24:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 00:24:55,221 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 00:24:55,224 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 00:24:55,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 00:24:55,303 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 00:24:55,303 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-03-31 00:24:55,303 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125076442] [2023-03-31 00:24:55,304 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 00:24:55,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050132875] [2023-03-31 00:24:55,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050132875] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 00:24:55,304 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 00:24:55,304 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 00:24:55,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260979137] [2023-03-31 00:24:55,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 00:24:55,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 00:24:55,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-03-31 00:24:55,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 00:24:55,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-03-31 00:24:55,333 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 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 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2023-03-31 00:24:55,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 00:24:55,402 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2023-03-31 00:24:55,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 00:24:55,405 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2023-03-31 00:24:55,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 00:24:55,409 INFO L225 Difference]: With dead ends: 42 [2023-03-31 00:24:55,409 INFO L226 Difference]: Without dead ends: 15 [2023-03-31 00:24:55,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-03-31 00:24:55,415 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 00:24:55,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 59 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 00:24:55,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-03-31 00:24:55,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-03-31 00:24:55,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 00:24:55,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-03-31 00:24:55,444 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2023-03-31 00:24:55,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 00:24:55,444 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-03-31 00:24:55,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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) [2023-03-31 00:24:55,445 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-03-31 00:24:55,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 00:24:55,445 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 00:24:55,445 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 00:24:55,453 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 00:24:55,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-03-31 00:24:55,651 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 00:24:55,655 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 00:24:55,655 INFO L85 PathProgramCache]: Analyzing trace with hash 1914943323, now seen corresponding path program 1 times [2023-03-31 00:24:55,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-03-31 00:24:55,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662422066] [2023-03-31 00:24:55,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 00:24:55,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 00:24:55,678 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 00:24:55,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1292472076] [2023-03-31 00:24:55,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 00:24:55,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 00:24:55,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 00:24:55,680 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) [2023-03-31 00:24:55,718 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 00:24:55,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 00:24:55,737 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 22 conjunts are in the unsatisfiable core [2023-03-31 00:24:55,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 00:24:55,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 00:24:55,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 00:24:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 00:24:56,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-03-31 00:24:56,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662422066] [2023-03-31 00:24:56,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 00:24:56,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292472076] [2023-03-31 00:24:56,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292472076] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 00:24:56,134 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 00:24:56,135 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2023-03-31 00:24:56,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443790161] [2023-03-31 00:24:56,135 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 00:24:56,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-03-31 00:24:56,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-03-31 00:24:56,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-03-31 00:24:56,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2023-03-31 00:24:56,137 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 00:24:58,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 00:24:58,901 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2023-03-31 00:24:58,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 00:24:58,901 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-03-31 00:24:58,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 00:24:58,902 INFO L225 Difference]: With dead ends: 28 [2023-03-31 00:24:58,902 INFO L226 Difference]: Without dead ends: 18 [2023-03-31 00:24:58,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=105, Invalid=315, Unknown=0, NotChecked=0, Total=420 [2023-03-31 00:24:58,904 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-03-31 00:24:58,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 48 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-03-31 00:24:58,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-03-31 00:24:58,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-03-31 00:24:58,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 00:24:58,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2023-03-31 00:24:58,908 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2023-03-31 00:24:58,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 00:24:58,908 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2023-03-31 00:24:58,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 12 states have internal predecessors, (19), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 00:24:58,909 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2023-03-31 00:24:58,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-03-31 00:24:58,909 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 00:24:58,909 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 00:24:58,914 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 00:24:59,113 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-03-31 00:24:59,114 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 00:24:59,114 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 00:24:59,114 INFO L85 PathProgramCache]: Analyzing trace with hash 580021722, now seen corresponding path program 2 times [2023-03-31 00:24:59,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-03-31 00:24:59,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880467066] [2023-03-31 00:24:59,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 00:24:59,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 00:24:59,130 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 00:24:59,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1648839868] [2023-03-31 00:24:59,130 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-03-31 00:24:59,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 00:24:59,130 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 00:24:59,131 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) [2023-03-31 00:24:59,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 00:24:59,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-03-31 00:24:59,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 00:24:59,195 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 41 conjunts are in the unsatisfiable core [2023-03-31 00:24:59,196 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 00:24:59,337 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 00:24:59,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 00:24:59,840 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 00:24:59,841 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-03-31 00:24:59,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880467066] [2023-03-31 00:24:59,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 00:24:59,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648839868] [2023-03-31 00:24:59,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648839868] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 00:24:59,841 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 00:24:59,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2023-03-31 00:24:59,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361498816] [2023-03-31 00:24:59,841 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 00:24:59,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 00:24:59,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-03-31 00:24:59,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 00:24:59,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=292, Unknown=0, NotChecked=0, Total=380 [2023-03-31 00:24:59,843 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 17 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2)