/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/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/loop-simple/nested_4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 05:08:13,668 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 05:08:13,670 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 05:08:13,704 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 05:08:13,704 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 05:08:13,710 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 05:08:13,714 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 05:08:13,716 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 05:08:13,718 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 05:08:13,724 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 05:08:13,725 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 05:08:13,727 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 05:08:13,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 05:08:13,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 05:08:13,728 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 05:08:13,729 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 05:08:13,730 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 05:08:13,730 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 05:08:13,731 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 05:08:13,733 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 05:08:13,734 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 05:08:13,737 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 05:08:13,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 05:08:13,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 05:08:13,746 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 05:08:13,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 05:08:13,754 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 05:08:13,755 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 05:08:13,756 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 05:08:13,787 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 05:08:13,787 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 05:08:13,788 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 05:08:13,788 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 05:08:13,789 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 05:08:13,789 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 05:08:13,789 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 05:08:13,789 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 05:08:13,789 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 05:08:13,789 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 05:08:13,790 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 05:08:13,790 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 05:08:13,790 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 05:08:13,790 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 05:08:13,790 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 05:08:13,791 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 05:08:13,791 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 05:08:13,791 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 05:08:13,791 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 05:08:13,791 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 05:08:13,792 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 05:08:13,793 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 05:08:13,793 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 05:08:13,793 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 05:08:13,793 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 05:08:13,793 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:08:13,794 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 05:08:13,794 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 05:08:13,794 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 05:08:13,999 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 05:08:14,026 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 05:08:14,028 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 05:08:14,029 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 05:08:14,031 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 05:08:14,032 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/nested_4.c [2023-04-01 05:08:15,228 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 05:08:15,417 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 05:08:15,418 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_4.c [2023-04-01 05:08:15,422 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99754b90d/4222c252c0574eed8749625601812cb4/FLAG88f878a67 [2023-04-01 05:08:15,434 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99754b90d/4222c252c0574eed8749625601812cb4 [2023-04-01 05:08:15,437 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 05:08:15,438 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 05:08:15,439 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 05:08:15,439 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 05:08:15,442 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 05:08:15,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ee4beec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15, skipping insertion in model container [2023-04-01 05:08:15,444 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,450 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 05:08:15,459 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 05:08:15,582 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/loop-simple/nested_4.c[841,854] [2023-04-01 05:08:15,587 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:08:15,595 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 05:08:15,611 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/loop-simple/nested_4.c[841,854] [2023-04-01 05:08:15,613 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:08:15,626 INFO L208 MainTranslator]: Completed translation [2023-04-01 05:08:15,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15 WrapperNode [2023-04-01 05:08:15,627 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 05:08:15,628 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 05:08:15,628 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 05:08:15,628 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 05:08:15,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,643 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,644 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,661 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,666 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,667 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,670 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 05:08:15,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 05:08:15,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 05:08:15,672 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 05:08:15,673 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (1/1) ... [2023-04-01 05:08:15,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:08:15,689 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:15,712 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 05:08:15,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 05:08:15,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 05:08:15,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 05:08:15,752 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 05:08:15,752 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 05:08:15,752 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 05:08:15,752 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 05:08:15,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 05:08:15,816 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 05:08:15,818 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 05:08:15,969 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 05:08:15,993 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 05:08:15,993 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 05:08:15,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:08:15 BoogieIcfgContainer [2023-04-01 05:08:15,996 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 05:08:15,998 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 05:08:15,998 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 05:08:16,001 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 05:08:16,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 05:08:15" (1/3) ... [2023-04-01 05:08:16,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e39c788 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:08:16, skipping insertion in model container [2023-04-01 05:08:16,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:08:15" (2/3) ... [2023-04-01 05:08:16,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e39c788 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:08:16, skipping insertion in model container [2023-04-01 05:08:16,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:08:15" (3/3) ... [2023-04-01 05:08:16,003 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_4.c [2023-04-01 05:08:16,018 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 05:08:16,018 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 05:08:16,064 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 05:08:16,069 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=FINITE_AUTOMATA, 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;@6f3e6003, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 05:08:16,070 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 05:08:16,073 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 05:08:16,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-04-01 05:08:16,079 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:16,080 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:16,080 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:16,085 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:16,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1370767981, now seen corresponding path program 1 times [2023-04-01 05:08:16,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:16,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801214511] [2023-04-01 05:08:16,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:16,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:16,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801214511] [2023-04-01 05:08:16,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801214511] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:08:16,260 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:08:16,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:08:16,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582388521] [2023-04-01 05:08:16,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:08:16,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:08:16,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:16,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:08:16,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,310 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:16,374 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2023-04-01 05:08:16,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:08:16,377 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 8 [2023-04-01 05:08:16,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:16,385 INFO L225 Difference]: With dead ends: 27 [2023-04-01 05:08:16,385 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 05:08:16,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,390 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:16,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 19 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:16,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 05:08:16,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2023-04-01 05:08:16,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-04-01 05:08:16,419 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2023-04-01 05:08:16,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:16,420 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-04-01 05:08:16,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,420 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-04-01 05:08:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 05:08:16,421 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:16,421 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:16,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 05:08:16,421 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:16,422 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:16,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1301729267, now seen corresponding path program 1 times [2023-04-01 05:08:16,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:16,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517002926] [2023-04-01 05:08:16,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:16,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:16,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517002926] [2023-04-01 05:08:16,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517002926] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:08:16,505 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:08:16,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:08:16,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446710812] [2023-04-01 05:08:16,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:08:16,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:08:16,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:16,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:08:16,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,508 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:16,542 INFO L93 Difference]: Finished difference Result 23 states and 32 transitions. [2023-04-01 05:08:16,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:08:16,542 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-04-01 05:08:16,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:16,543 INFO L225 Difference]: With dead ends: 23 [2023-04-01 05:08:16,543 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 05:08:16,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,545 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:16,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:16,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 05:08:16,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2023-04-01 05:08:16,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-04-01 05:08:16,550 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 10 [2023-04-01 05:08:16,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:16,550 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-04-01 05:08:16,550 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,550 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-04-01 05:08:16,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 05:08:16,551 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:16,551 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:16,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 05:08:16,551 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:16,552 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:16,552 INFO L85 PathProgramCache]: Analyzing trace with hash 1571545639, now seen corresponding path program 1 times [2023-04-01 05:08:16,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:16,552 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347755484] [2023-04-01 05:08:16,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:16,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347755484] [2023-04-01 05:08:16,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347755484] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:08:16,629 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:08:16,629 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:08:16,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081908005] [2023-04-01 05:08:16,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:08:16,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:08:16,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:16,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:08:16,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,630 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:16,655 INFO L93 Difference]: Finished difference Result 24 states and 32 transitions. [2023-04-01 05:08:16,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:08:16,656 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-01 05:08:16,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:16,656 INFO L225 Difference]: With dead ends: 24 [2023-04-01 05:08:16,657 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 05:08:16,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,658 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:16,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 13 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:16,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 05:08:16,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-04-01 05:08:16,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-04-01 05:08:16,662 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2023-04-01 05:08:16,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:16,663 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-04-01 05:08:16,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,663 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-04-01 05:08:16,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 05:08:16,663 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:16,664 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:16,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 05:08:16,664 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:16,664 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:16,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1245222041, now seen corresponding path program 1 times [2023-04-01 05:08:16,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:16,665 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834389137] [2023-04-01 05:08:16,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:16,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:16,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834389137] [2023-04-01 05:08:16,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834389137] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:08:16,710 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:08:16,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:08:16,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316823014] [2023-04-01 05:08:16,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:08:16,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:08:16,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:16,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:08:16,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,712 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:16,726 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2023-04-01 05:08:16,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:08:16,726 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-01 05:08:16,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:16,727 INFO L225 Difference]: With dead ends: 25 [2023-04-01 05:08:16,727 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 05:08:16,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:08:16,728 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:16,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:16,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 05:08:16,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-01 05:08:16,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-04-01 05:08:16,733 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 14 [2023-04-01 05:08:16,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:16,733 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-04-01 05:08:16,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:16,733 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-04-01 05:08:16,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 05:08:16,734 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:16,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:16,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 05:08:16,734 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:16,735 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:16,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1467098867, now seen corresponding path program 1 times [2023-04-01 05:08:16,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:16,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740507556] [2023-04-01 05:08:16,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:16,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:16,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740507556] [2023-04-01 05:08:16,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740507556] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:16,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537357723] [2023-04-01 05:08:16,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:16,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:16,781 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:16,783 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:16,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 05:08:16,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:16,848 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 05:08:16,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:16,885 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,885 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:16,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:08:16,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537357723] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:16,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [54721661] [2023-04-01 05:08:16,939 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:16,939 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:16,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:16,947 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:16,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:17,022 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:17,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:17,590 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:18,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '387#(and (<= 1 |#StackHeapBarrier|) (<= 6 main_~c~0) (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~d~0) (<= 6 main_~b~0) (<= 6 main_~a~0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:08:18,042 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:18,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:18,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 05:08:18,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308929178] [2023-04-01 05:08:18,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:18,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 05:08:18,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:18,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 05:08:18,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2023-04-01 05:08:18,050 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:18,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:18,077 INFO L93 Difference]: Finished difference Result 29 states and 38 transitions. [2023-04-01 05:08:18,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 05:08:18,078 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-01 05:08:18,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:18,078 INFO L225 Difference]: With dead ends: 29 [2023-04-01 05:08:18,078 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 05:08:18,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2023-04-01 05:08:18,080 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:18,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:18,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 05:08:18,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 05:08:18,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:18,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-04-01 05:08:18,087 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2023-04-01 05:08:18,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:18,087 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-04-01 05:08:18,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:18,088 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-04-01 05:08:18,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 05:08:18,089 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:18,089 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:18,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 05:08:18,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:18,290 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:18,291 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:18,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1791534311, now seen corresponding path program 2 times [2023-04-01 05:08:18,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:18,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532362483] [2023-04-01 05:08:18,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:18,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:18,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:18,364 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:08:18,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:18,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532362483] [2023-04-01 05:08:18,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532362483] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:18,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088023093] [2023-04-01 05:08:18,367 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:08:18,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:18,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:18,370 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:18,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 05:08:18,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 05:08:18,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:08:18,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 05:08:18,416 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:18,442 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 05:08:18,442 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:18,475 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 05:08:18,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088023093] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:18,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651359219] [2023-04-01 05:08:18,480 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:18,480 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:18,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:18,481 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:18,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:18,510 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:18,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:18,779 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:19,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '594#(and (<= 1 |#StackHeapBarrier|) (<= 6 main_~c~0) (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~d~0) (<= 6 main_~b~0) (<= 6 main_~a~0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:08:19,171 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:19,171 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:19,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-04-01 05:08:19,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561166001] [2023-04-01 05:08:19,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:19,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 05:08:19,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:19,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 05:08:19,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-04-01 05:08:19,173 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:19,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:19,302 INFO L93 Difference]: Finished difference Result 106 states and 136 transitions. [2023-04-01 05:08:19,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 05:08:19,302 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 05:08:19,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:19,303 INFO L225 Difference]: With dead ends: 106 [2023-04-01 05:08:19,303 INFO L226 Difference]: Without dead ends: 93 [2023-04-01 05:08:19,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2023-04-01 05:08:19,305 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:19,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 26 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:19,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-04-01 05:08:19,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 73. [2023-04-01 05:08:19,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 69 states have (on average 1.2463768115942029) internal successors, (86), 69 states have internal predecessors, (86), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:19,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2023-04-01 05:08:19,315 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 18 [2023-04-01 05:08:19,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:19,315 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2023-04-01 05:08:19,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:19,316 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2023-04-01 05:08:19,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-01 05:08:19,317 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:19,317 INFO L195 NwaCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:19,325 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 05:08:19,523 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,SelfDestructingSolverStorable5 [2023-04-01 05:08:19,523 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:19,524 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:19,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1577669915, now seen corresponding path program 3 times [2023-04-01 05:08:19,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:19,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007089146] [2023-04-01 05:08:19,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:19,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:19,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:19,657 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 343 proven. 1 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2023-04-01 05:08:19,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:19,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007089146] [2023-04-01 05:08:19,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007089146] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:19,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788174126] [2023-04-01 05:08:19,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:08:19,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:19,658 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:19,661 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:19,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 05:08:19,736 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:08:19,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:08:19,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 05:08:19,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:19,782 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2023-04-01 05:08:19,783 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:19,826 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2023-04-01 05:08:19,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788174126] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:19,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816534649] [2023-04-01 05:08:19,836 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:19,836 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:19,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:19,837 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:19,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:19,857 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:20,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:20,224 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:20,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1405#(and (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~b~0) (<= 6 main_~a~0))' at error location [2023-04-01 05:08:20,384 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:20,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:20,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2023-04-01 05:08:20,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985762926] [2023-04-01 05:08:20,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:20,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 05:08:20,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:20,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 05:08:20,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2023-04-01 05:08:20,387 INFO L87 Difference]: Start difference. First operand 73 states and 89 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:20,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:20,591 INFO L93 Difference]: Finished difference Result 295 states and 403 transitions. [2023-04-01 05:08:20,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-01 05:08:20,591 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2023-04-01 05:08:20,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:20,593 INFO L225 Difference]: With dead ends: 295 [2023-04-01 05:08:20,593 INFO L226 Difference]: Without dead ends: 229 [2023-04-01 05:08:20,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 198 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=203, Invalid=727, Unknown=0, NotChecked=0, Total=930 [2023-04-01 05:08:20,594 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 10 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:20,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:20,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2023-04-01 05:08:20,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 161. [2023-04-01 05:08:20,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 157 states have (on average 1.1847133757961783) internal successors, (186), 157 states have internal predecessors, (186), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:20,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 189 transitions. [2023-04-01 05:08:20,615 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 189 transitions. Word has length 72 [2023-04-01 05:08:20,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:20,615 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 189 transitions. [2023-04-01 05:08:20,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:20,616 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 189 transitions. [2023-04-01 05:08:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-04-01 05:08:20,619 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:20,619 INFO L195 NwaCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:20,628 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 05:08:20,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:20,826 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:20,826 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:20,826 INFO L85 PathProgramCache]: Analyzing trace with hash 155021533, now seen corresponding path program 4 times [2023-04-01 05:08:20,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:20,826 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845249573] [2023-04-01 05:08:20,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:20,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:20,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:21,081 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-04-01 05:08:21,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:21,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845249573] [2023-04-01 05:08:21,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845249573] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:21,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025627895] [2023-04-01 05:08:21,081 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:08:21,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:21,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:21,083 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:21,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 05:08:21,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:21,208 INFO L262 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 05:08:21,222 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:21,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-04-01 05:08:21,254 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:21,300 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-04-01 05:08:21,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025627895] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:21,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1427828561] [2023-04-01 05:08:21,303 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:21,303 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:21,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:21,304 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:21,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:21,321 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:21,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:21,586 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:21,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3305#(and (<= 1 |#StackHeapBarrier|) (<= 6 main_~c~0) (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~d~0) (<= 6 main_~b~0) (<= 6 main_~a~0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:08:21,938 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:21,938 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:21,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-01 05:08:21,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298570137] [2023-04-01 05:08:21,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:21,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 05:08:21,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:21,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 05:08:21,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:21,940 INFO L87 Difference]: Start difference. First operand 161 states and 189 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:22,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:22,002 INFO L93 Difference]: Finished difference Result 554 states and 671 transitions. [2023-04-01 05:08:22,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 05:08:22,002 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2023-04-01 05:08:22,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:22,004 INFO L225 Difference]: With dead ends: 554 [2023-04-01 05:08:22,004 INFO L226 Difference]: Without dead ends: 417 [2023-04-01 05:08:22,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:22,006 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:22,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:22,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2023-04-01 05:08:22,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2023-04-01 05:08:22,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 413 states have (on average 1.1476997578692494) internal successors, (474), 413 states have internal predecessors, (474), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:22,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 477 transitions. [2023-04-01 05:08:22,063 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 477 transitions. Word has length 160 [2023-04-01 05:08:22,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:22,065 INFO L495 AbstractCegarLoop]: Abstraction has 417 states and 477 transitions. [2023-04-01 05:08:22,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 9 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:22,065 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 477 transitions. [2023-04-01 05:08:22,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2023-04-01 05:08:22,077 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:22,078 INFO L195 NwaCegarLoop]: trace histogram [288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:22,086 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 05:08:22,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:22,278 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:22,279 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:22,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1818748701, now seen corresponding path program 5 times [2023-04-01 05:08:22,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:22,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370940895] [2023-04-01 05:08:22,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:22,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:22,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-04-01 05:08:22,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:22,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370940895] [2023-04-01 05:08:22,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370940895] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:22,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610766050] [2023-04-01 05:08:22,665 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:08:22,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:22,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:22,666 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:22,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 05:08:22,898 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 103 check-sat command(s) [2023-04-01 05:08:22,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:08:22,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 05:08:22,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:23,032 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-04-01 05:08:23,033 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:23,170 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-04-01 05:08:23,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610766050] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:23,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1352605502] [2023-04-01 05:08:23,173 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:23,173 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:23,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:23,173 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:23,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:23,185 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:23,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:23,396 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:23,752 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7747#(and (<= 1 |#StackHeapBarrier|) (<= 6 main_~c~0) (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~d~0) (<= 6 main_~b~0) (<= 6 main_~a~0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:08:23,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:23,753 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:23,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-01 05:08:23,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227145231] [2023-04-01 05:08:23,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:23,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 05:08:23,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:23,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 05:08:23,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:23,755 INFO L87 Difference]: Start difference. First operand 417 states and 477 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:23,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:23,896 INFO L93 Difference]: Finished difference Result 1527 states and 1760 transitions. [2023-04-01 05:08:23,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 05:08:23,896 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 416 [2023-04-01 05:08:23,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:23,901 INFO L225 Difference]: With dead ends: 1527 [2023-04-01 05:08:23,901 INFO L226 Difference]: Without dead ends: 1217 [2023-04-01 05:08:23,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1252 GetRequests, 1236 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:23,903 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:23,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:23,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1217 states. [2023-04-01 05:08:24,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1217 to 1217. [2023-04-01 05:08:24,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1217 states, 1213 states have (on average 1.1426215993404782) internal successors, (1386), 1213 states have internal predecessors, (1386), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:24,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1217 states to 1217 states and 1389 transitions. [2023-04-01 05:08:24,012 INFO L78 Accepts]: Start accepts. Automaton has 1217 states and 1389 transitions. Word has length 416 [2023-04-01 05:08:24,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:24,012 INFO L495 AbstractCegarLoop]: Abstraction has 1217 states and 1389 transitions. [2023-04-01 05:08:24,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:24,013 INFO L276 IsEmpty]: Start isEmpty. Operand 1217 states and 1389 transitions. [2023-04-01 05:08:24,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1217 [2023-04-01 05:08:24,047 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:24,048 INFO L195 NwaCegarLoop]: trace histogram [864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:24,057 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 05:08:24,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:24,254 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:24,255 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:24,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1598717059, now seen corresponding path program 6 times [2023-04-01 05:08:24,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:24,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573892985] [2023-04-01 05:08:24,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:24,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:25,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:26,651 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2023-04-01 05:08:26,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:26,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573892985] [2023-04-01 05:08:26,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573892985] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:26,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449372771] [2023-04-01 05:08:26,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:08:26,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:26,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:26,653 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:26,656 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 05:08:27,298 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:08:27,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:08:27,313 INFO L262 TraceCheckSpWp]: Trace formula consists of 3650 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 05:08:27,335 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:28,698 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2023-04-01 05:08:28,699 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:30,080 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2023-04-01 05:08:30,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449372771] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:30,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870831289] [2023-04-01 05:08:30,083 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:30,083 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:30,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:30,083 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:30,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:30,102 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:30,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:30,405 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:30,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20535#(and (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~b~0) (<= 6 main_~a~0))' at error location [2023-04-01 05:08:30,618 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:30,618 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:30,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2023-04-01 05:08:30,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717767189] [2023-04-01 05:08:30,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:30,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 05:08:30,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:30,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 05:08:30,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:30,621 INFO L87 Difference]: Start difference. First operand 1217 states and 1389 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:30,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:08:30,819 INFO L93 Difference]: Finished difference Result 1824 states and 2083 transitions. [2023-04-01 05:08:30,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 05:08:30,819 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1216 [2023-04-01 05:08:30,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:08:30,829 INFO L225 Difference]: With dead ends: 1824 [2023-04-01 05:08:30,829 INFO L226 Difference]: Without dead ends: 1821 [2023-04-01 05:08:30,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3654 GetRequests, 3634 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:08:30,831 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:08:30,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 36 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:08:30,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1821 states. [2023-04-01 05:08:30,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1821 to 1821. [2023-04-01 05:08:30,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1817 states have (on average 1.1425426527242708) internal successors, (2076), 1817 states have internal predecessors, (2076), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:30,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2079 transitions. [2023-04-01 05:08:30,967 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2079 transitions. Word has length 1216 [2023-04-01 05:08:30,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:08:30,969 INFO L495 AbstractCegarLoop]: Abstraction has 1821 states and 2079 transitions. [2023-04-01 05:08:30,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:08:30,969 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2079 transitions. [2023-04-01 05:08:31,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2023-04-01 05:08:31,079 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:08:31,080 INFO L195 NwaCegarLoop]: trace histogram [1296, 216, 216, 36, 36, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:08:31,093 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 05:08:31,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:31,291 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:08:31,291 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:08:31,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1733908997, now seen corresponding path program 7 times [2023-04-01 05:08:31,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:08:31,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945083980] [2023-04-01 05:08:31,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:08:31,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:08:33,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1174824 backedges. 0 proven. 1007769 refuted. 0 times theorem prover too weak. 167055 trivial. 0 not checked. [2023-04-01 05:08:39,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:08:39,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945083980] [2023-04-01 05:08:39,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945083980] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:08:39,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117326257] [2023-04-01 05:08:39,331 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:08:39,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:08:39,331 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:08:39,333 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:08:39,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 05:08:40,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:08:40,155 INFO L262 TraceCheckSpWp]: Trace formula consists of 5485 conjuncts, 33 conjunts are in the unsatisfiable core [2023-04-01 05:08:40,200 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:08:42,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1174824 backedges. 0 proven. 1007769 refuted. 0 times theorem prover too weak. 167055 trivial. 0 not checked. [2023-04-01 05:08:42,773 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:08:47,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1174824 backedges. 0 proven. 1007769 refuted. 0 times theorem prover too weak. 167055 trivial. 0 not checked. [2023-04-01 05:08:47,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117326257] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:08:47,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1721908852] [2023-04-01 05:08:47,363 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-01 05:08:47,363 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:08:47,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:08:47,363 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:08:47,363 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:08:47,373 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:08:47,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:08:47,573 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:08:47,814 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38797#(and (or (not (= main_~c~0 6)) (not (= main_~d~0 6)) (not (= main_~b~0 6)) (not (= main_~a~0 6))) (<= 6 main_~b~0) (<= 6 main_~a~0))' at error location [2023-04-01 05:08:47,815 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:08:47,815 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:08:47,815 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 57 [2023-04-01 05:08:47,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681241354] [2023-04-01 05:08:47,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:08:47,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-04-01 05:08:47,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:08:47,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-04-01 05:08:47,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=894, Invalid=3396, Unknown=0, NotChecked=0, Total=4290 [2023-04-01 05:08:47,820 INFO L87 Difference]: Start difference. First operand 1821 states and 2079 transitions. Second operand has 57 states, 57 states have (on average 2.8947368421052633) internal successors, (165), 57 states have internal predecessors, (165), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)