/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --traceabstraction.cegar.restart.behaviour ONE_CEGAR_PER_ERROR_LOCATION --traceabstraction.trace.refinement.strategy BADGER -s ../../../trunk/examples/settings/gemcutter/NewStatesSleep.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/boogie-benchmarks-from-svcomp-memsafety-concurrent/chunk25/divinefifo-bug_1w1r.line394.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.2-wip.dk.por-optimizations-e57bdd3-m [2022-10-24 11:12:30,672 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-24 11:12:30,675 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-24 11:12:30,718 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-24 11:12:30,719 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-24 11:12:30,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-24 11:12:30,725 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-24 11:12:30,730 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-24 11:12:30,734 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-24 11:12:30,739 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-24 11:12:30,740 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-24 11:12:30,742 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-24 11:12:30,742 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-24 11:12:30,748 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-24 11:12:30,750 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-24 11:12:30,751 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-24 11:12:30,751 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-24 11:12:30,752 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-24 11:12:30,755 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-24 11:12:30,763 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-24 11:12:30,764 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-24 11:12:30,766 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-24 11:12:30,767 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-24 11:12:30,769 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-24 11:12:30,777 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-24 11:12:30,778 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-24 11:12:30,778 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-24 11:12:30,780 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-24 11:12:30,781 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-24 11:12:30,784 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-24 11:12:30,784 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-24 11:12:30,785 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-24 11:12:30,787 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-24 11:12:30,788 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-24 11:12:30,789 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-24 11:12:30,789 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-24 11:12:30,789 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-24 11:12:30,790 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-24 11:12:30,790 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-24 11:12:30,791 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-24 11:12:30,791 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-24 11:12:30,792 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/gemcutter/NewStatesSleep.epf [2022-10-24 11:12:30,846 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-24 11:12:30,847 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-24 11:12:30,847 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-24 11:12:30,847 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-24 11:12:30,848 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-24 11:12:30,849 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-24 11:12:30,851 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-10-24 11:12:30,851 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-10-24 11:12:30,851 INFO L138 SettingsManager]: * Use SBE=true [2022-10-24 11:12:30,851 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-24 11:12:30,852 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-24 11:12:30,852 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-24 11:12:30,852 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-24 11:12:30,853 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-24 11:12:30,854 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-24 11:12:30,854 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-24 11:12:30,854 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-10-24 11:12:30,854 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-10-24 11:12:30,854 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-24 11:12:30,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-24 11:12:30,855 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-24 11:12:30,855 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-24 11:12:30,855 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-24 11:12:30,855 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-10-24 11:12:30,855 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-24 11:12:30,855 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-10-24 11:12:30,856 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PARTIAL_ORDER_FA [2022-10-24 11:12:30,856 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-24 11:12:30,856 INFO L138 SettingsManager]: * Partial Order Reduction in concurrent analysis=SLEEP_NEW_STATES [2022-10-24 11:12:30,856 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: CEGAR restart behaviour -> ONE_CEGAR_PER_ERROR_LOCATION Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> BADGER [2022-10-24 11:12:31,229 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-24 11:12:31,255 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-24 11:12:31,258 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-24 11:12:31,259 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2022-10-24 11:12:31,261 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2022-10-24 11:12:31,262 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/boogie-benchmarks-from-svcomp-memsafety-concurrent/chunk25/divinefifo-bug_1w1r.line394.bpl [2022-10-24 11:12:31,263 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/boogie-benchmarks-from-svcomp-memsafety-concurrent/chunk25/divinefifo-bug_1w1r.line394.bpl' [2022-10-24 11:12:31,348 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-24 11:12:31,350 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-10-24 11:12:31,351 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-24 11:12:31,351 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-24 11:12:31,351 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-24 11:12:31,362 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,410 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,419 INFO L138 Inliner]: procedures = 2, calls = 1, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2022-10-24 11:12:31,420 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-24 11:12:31,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-24 11:12:31,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-24 11:12:31,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-24 11:12:31,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,448 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,503 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,517 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-24 11:12:31,532 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-24 11:12:31,532 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-24 11:12:31,532 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-24 11:12:31,534 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/1) ... [2022-10-24 11:12:31,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-24 11:12:31,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-10-24 11:12:31,564 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) [2022-10-24 11:12:31,580 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 [2022-10-24 11:12:31,630 INFO L130 BoogieDeclarations]: Found specification of procedure pusher [2022-10-24 11:12:31,630 INFO L138 BoogieDeclarations]: Found implementation of procedure pusher [2022-10-24 11:12:31,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-24 11:12:31,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-24 11:12:31,633 WARN L208 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-10-24 11:12:31,859 INFO L234 CfgBuilder]: Building ICFG [2022-10-24 11:12:31,860 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-24 11:12:33,130 INFO L275 CfgBuilder]: Performing block encoding [2022-10-24 11:12:33,165 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-24 11:12:33,165 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2022-10-24 11:12:33,169 INFO L202 PluginConnector]: Adding new model divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:12:33 BoogieIcfgContainer [2022-10-24 11:12:33,169 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-24 11:12:33,171 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-24 11:12:33,171 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-24 11:12:33,174 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-24 11:12:33,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.10 11:12:31" (1/2) ... [2022-10-24 11:12:33,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23e8a1c8 and model type divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:12:33, skipping insertion in model container [2022-10-24 11:12:33,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "divinefifo-bug_1w1r.line394.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:12:33" (2/2) ... [2022-10-24 11:12:33,177 INFO L112 eAbstractionObserver]: Analyzing ICFG divinefifo-bug_1w1r.line394.bpl [2022-10-24 11:12:33,184 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2022-10-24 11:12:33,192 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-24 11:12:33,192 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-24 11:12:33,193 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-10-24 11:12:33,336 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2022-10-24 11:12:33,418 INFO L100 denceProviderFactory]: Independence Relation #1: [IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=true, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 [2022-10-24 11:12:33,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-10-24 11:12:33,422 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (exit command is (exit), workingDir is null) [2022-10-24 11:12:33,429 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (2)] Waiting until timeout for monitored process [2022-10-24 11:12:33,462 INFO L159 artialOrderCegarLoop]: Running PartialOrderCegarLoop with 1 independence relations. [2022-10-24 11:12:33,470 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == pusherErr0ASSERT_VIOLATIONASSERT ======== [2022-10-24 11:12:33,476 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=PARTIAL_ORDER_FA, 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;@1c651411, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,477 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-24 11:12:33,480 WARN L124 DepthFirstTraversal]: Depth first traversal did not find any initial state. Returning directly. [2022-10-24 11:12:33,483 INFO L805 garLoopResultBuilder]: Registering result SAFE for location pusherErr0ASSERT_VIOLATIONASSERT (0 of 1 remaining) [2022-10-24 11:12:33,488 INFO L444 BasicCegarLoop]: Path program histogram: [] [2022-10-24 11:12:33,490 INFO L307 ceAbstractionStarter]: Result for error location pusherErr0ASSERT_VIOLATIONASSERT was SAFE (1/3) [2022-10-24 11:12:33,506 INFO L100 denceProviderFactory]: Independence Relation #1: [IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=true, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 [2022-10-24 11:12:33,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-10-24 11:12:33,513 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (exit command is (exit), workingDir is null) [2022-10-24 11:12:33,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (3)] Waiting until timeout for monitored process [2022-10-24 11:12:33,519 INFO L159 artialOrderCegarLoop]: Running PartialOrderCegarLoop with 1 independence relations. [2022-10-24 11:12:33,520 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES ======== [2022-10-24 11:12:33,521 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=PARTIAL_ORDER_FA, 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;@1c651411, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,521 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-24 11:12:33,586 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2022-10-24 11:12:33,588 INFO L444 BasicCegarLoop]: Path program histogram: [] [2022-10-24 11:12:33,588 INFO L307 ceAbstractionStarter]: Result for error location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES was SAFE (2/3) [2022-10-24 11:12:33,630 INFO L100 denceProviderFactory]: Independence Relation #1: [IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=true, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 [2022-10-24 11:12:33,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-10-24 11:12:33,636 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (exit command is (exit), workingDir is null) [2022-10-24 11:12:33,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:1000 (4)] Waiting until timeout for monitored process [2022-10-24 11:12:33,641 INFO L159 artialOrderCegarLoop]: Running PartialOrderCegarLoop with 1 independence relations. [2022-10-24 11:12:33,641 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == pusherErr0ASSERT_VIOLATIONASSERT ======== [2022-10-24 11:12:33,643 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=PARTIAL_ORDER_FA, 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;@1c651411, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-24 11:12:33,643 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-24 11:12:33,724 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:12:33,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:12:33,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1674533989, now seen corresponding path program 1 times [2022-10-24 11:12:33,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:12:33,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459761639] [2022-10-24 11:12:33,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:12:33,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:12:34,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:12:34,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-24 11:12:34,230 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:12:34,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459761639] [2022-10-24 11:12:34,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459761639] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-24 11:12:34,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-24 11:12:34,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-24 11:12:34,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831418932] [2022-10-24 11:12:34,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-24 11:12:34,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-10-24 11:12:34,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:12:34,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-10-24 11:12:34,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-24 11:12:34,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:34,353 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:12:34,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 160.5) internal successors, (321), 2 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:12:34,356 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:34,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:34,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-24 11:12:34,424 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:12:34,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:12:34,425 INFO L85 PathProgramCache]: Analyzing trace with hash 360783473, now seen corresponding path program 1 times [2022-10-24 11:12:34,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:12:34,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990619957] [2022-10-24 11:12:34,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:12:34,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:12:34,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:12:34,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-24 11:12:34,965 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:12:34,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990619957] [2022-10-24 11:12:34,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990619957] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-24 11:12:34,966 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-24 11:12:34,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-10-24 11:12:34,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559822656] [2022-10-24 11:12:34,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-24 11:12:34,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-10-24 11:12:34,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:12:34,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-10-24 11:12:34,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-10-24 11:12:34,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:34,969 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:12:34,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 26.666666666666668) internal successors, (320), 13 states have internal predecessors, (320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:12:34,969 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:34,969 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:37,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:37,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:12:37,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-24 11:12:37,358 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:12:37,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:12:37,360 INFO L85 PathProgramCache]: Analyzing trace with hash 161611122, now seen corresponding path program 1 times [2022-10-24 11:12:37,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:12:37,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937716047] [2022-10-24 11:12:37,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:12:37,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:12:38,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:12:41,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 699 proven. 237 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2022-10-24 11:12:41,107 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:12:41,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937716047] [2022-10-24 11:12:41,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937716047] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-24 11:12:41,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-10-24 11:12:41,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2022-10-24 11:12:41,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620389363] [2022-10-24 11:12:41,108 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-10-24 11:12:41,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-10-24 11:12:41,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:12:41,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-10-24 11:12:41,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1690, Unknown=0, NotChecked=0, Total=1806 [2022-10-24 11:12:41,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:41,113 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:12:41,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 28.906976744186046) internal successors, (1243), 43 states have internal predecessors, (1243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:12:41,115 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:41,115 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:12:41,115 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:45,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:45,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:12:45,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-10-24 11:12:45,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-24 11:12:45,336 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:12:45,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:12:45,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1228833455, now seen corresponding path program 1 times [2022-10-24 11:12:45,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:12:45,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777374553] [2022-10-24 11:12:45,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:12:45,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:12:45,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:12:45,549 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 385 proven. 0 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2022-10-24 11:12:45,549 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:12:45,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777374553] [2022-10-24 11:12:45,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777374553] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-24 11:12:45,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-24 11:12:45,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-24 11:12:45,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539778115] [2022-10-24 11:12:45,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-24 11:12:45,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-24 11:12:45,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:12:45,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-24 11:12:45,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-24 11:12:45,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:45,553 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:12:45,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 195.66666666666666) internal successors, (587), 3 states have internal predecessors, (587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:12:45,554 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:12:45,554 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:12:45,554 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 42 states. [2022-10-24 11:12:45,554 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:24,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:24,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:13:24,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2022-10-24 11:13:24,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:13:24,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-24 11:13:24,772 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:13:24,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:13:24,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1455606250, now seen corresponding path program 1 times [2022-10-24 11:13:24,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:13:24,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818025872] [2022-10-24 11:13:24,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:13:24,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:13:27,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:13:32,923 INFO L134 CoverageAnalysis]: Checked inductivity of 33055 backedges. 17571 proven. 0 refuted. 0 times theorem prover too weak. 15484 trivial. 0 not checked. [2022-10-24 11:13:32,923 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:13:32,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818025872] [2022-10-24 11:13:32,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818025872] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-24 11:13:32,925 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-24 11:13:32,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-10-24 11:13:32,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802100709] [2022-10-24 11:13:32,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-24 11:13:32,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-10-24 11:13:32,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:13:32,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-10-24 11:13:32,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=414, Unknown=0, NotChecked=0, Total=462 [2022-10-24 11:13:32,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:32,930 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:13:32,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 83.0909090909091) internal successors, (1828), 22 states have internal predecessors, (1828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:13:32,932 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:32,932 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:13:32,932 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 212 states. [2022-10-24 11:13:32,932 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:13:32,932 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:37,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:37,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:13:37,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2022-10-24 11:13:37,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:13:37,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-10-24 11:13:37,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-24 11:13:37,708 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:13:37,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:13:37,710 INFO L85 PathProgramCache]: Analyzing trace with hash 228190614, now seen corresponding path program 2 times [2022-10-24 11:13:37,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:13:37,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559812403] [2022-10-24 11:13:37,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:13:37,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:13:40,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:13:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 41350 backedges. 38001 proven. 3319 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-10-24 11:13:48,285 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:13:48,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559812403] [2022-10-24 11:13:48,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559812403] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-24 11:13:48,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-10-24 11:13:48,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2022-10-24 11:13:48,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293850709] [2022-10-24 11:13:48,286 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-10-24 11:13:48,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-10-24 11:13:48,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:13:48,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-10-24 11:13:48,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2022-10-24 11:13:48,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:48,293 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:13:48,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 245.96) internal successors, (6149), 25 states have internal predecessors, (6149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 212 states. [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 38 states. [2022-10-24 11:13:48,298 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:15:58,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:15:58,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:15:58,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 532 states. [2022-10-24 11:15:58,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:15:58,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-10-24 11:15:58,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-10-24 11:15:58,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-24 11:15:58,405 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:15:58,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:15:58,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1701621496, now seen corresponding path program 1 times [2022-10-24 11:15:58,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:15:58,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770594126] [2022-10-24 11:15:58,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:15:58,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:16:00,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:16:03,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2595 backedges. 798 proven. 192 refuted. 0 times theorem prover too weak. 1605 trivial. 0 not checked. [2022-10-24 11:16:03,089 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:16:03,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770594126] [2022-10-24 11:16:03,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770594126] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-24 11:16:03,089 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-10-24 11:16:03,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2022-10-24 11:16:03,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259408704] [2022-10-24 11:16:03,090 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-10-24 11:16:03,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-10-24 11:16:03,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:16:03,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-10-24 11:16:03,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2908, Unknown=0, NotChecked=0, Total=3080 [2022-10-24 11:16:03,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:16:03,093 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:16:03,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 10.872727272727273) internal successors, (598), 56 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:16:03,093 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:16:03,093 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:16:03,093 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 532 states. [2022-10-24 11:16:03,094 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:16:03,094 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 41 states. [2022-10-24 11:16:03,094 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 10 states. [2022-10-24 11:16:03,094 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 532 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-10-24 11:18:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-10-24 11:18:10,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-10-24 11:18:10,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-10-24 11:18:10,116 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting pusherErr0ASSERT_VIOLATIONASSERT === [pusherErr0ASSERT_VIOLATIONASSERT] === [2022-10-24 11:18:10,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-24 11:18:10,116 INFO L85 PathProgramCache]: Analyzing trace with hash 904745679, now seen corresponding path program 1 times [2022-10-24 11:18:10,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy BADGER [2022-10-24 11:18:10,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270862672] [2022-10-24 11:18:10,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-24 11:18:10,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-24 11:18:13,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-24 11:18:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2595 backedges. 600 proven. 1350 refuted. 0 times theorem prover too weak. 645 trivial. 0 not checked. [2022-10-24 11:18:33,792 INFO L136 FreeRefinementEngine]: Strategy BADGER found an infeasible trace [2022-10-24 11:18:33,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270862672] [2022-10-24 11:18:33,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270862672] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-24 11:18:33,792 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-10-24 11:18:33,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [176] total 176 [2022-10-24 11:18:33,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480411012] [2022-10-24 11:18:33,792 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-10-24 11:18:33,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-10-24 11:18:33,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy BADGER [2022-10-24 11:18:33,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-10-24 11:18:33,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=633, Invalid=30167, Unknown=0, NotChecked=0, Total=30800 [2022-10-24 11:18:33,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:18:33,802 INFO L495 AbstractCegarLoop]: Abstraction has currently 0 states, but on-demand construction may add more states [2022-10-24 11:18:33,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 6.1875) internal successors, (1089), 176 states have internal predecessors, (1089), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 21 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 532 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 3 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 41 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 10 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 126 states. [2022-10-24 11:18:33,818 INFO L154 InterpolantAutomaton]: Switched to On-DemandConstruction mode: deterministic interpolant automaton has 2 states.