/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/array-examples/standard_copy2_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 13:58:04,435 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 13:58:04,437 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 13:58:04,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-04-02 13:58:04,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 13:58:04,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 13:58:04,479 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 13:58:04,481 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 13:58:04,482 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 13:58:04,482 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 13:58:04,484 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 13:58:04,485 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 13:58:04,486 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 13:58:04,493 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 13:58:04,494 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 13:58:04,494 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 13:58:04,497 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 13:58:04,499 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 13:58:04,500 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 13:58:04,500 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 13:58:04,504 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 13:58:04,505 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 13:58:04,505 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 13:58:04,506 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 13:58:04,506 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 13:58:04,506 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 13:58:04,509 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 13:58:04,509 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 13:58:04,511 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 [2023-04-02 13:58:04,541 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 13:58:04,542 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 13:58:04,542 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 13:58:04,542 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 13:58:04,543 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 13:58:04,543 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 13:58:04,543 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 13:58:04,543 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 13:58:04,543 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 13:58:04,543 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 13:58:04,544 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 13:58:04,544 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 13:58:04,544 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 13:58:04,545 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 13:58:04,545 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 13:58:04,545 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 13:58:04,545 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 13:58:04,545 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 13:58:04,546 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 13:58:04,546 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 13:58:04,547 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 13:58:04,547 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 13:58:04,547 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 13:58:04,547 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 13:58:04,547 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 13:58:04,547 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 13:58:04,548 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 13:58:04,548 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 13:58:04,549 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 13:58:04,753 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 13:58:04,770 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 13:58:04,772 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 13:58:04,773 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 13:58:04,773 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 13:58:04,774 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy2_ground-1.i [2023-04-02 13:58:05,349 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 13:58:06,508 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 13:58:06,512 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-1.i [2023-04-02 13:58:06,516 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef1c9aeee/425e0015f8c742a18d56d20c9c28de61/FLAGcc119229a [2023-04-02 13:58:06,536 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef1c9aeee/425e0015f8c742a18d56d20c9c28de61 [2023-04-02 13:58:06,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 13:58:06,542 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 13:58:06,543 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 13:58:06,544 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 13:58:06,546 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 13:58:06,547 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,548 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@429d1bac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06, skipping insertion in model container [2023-04-02 13:58:06,548 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,554 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 13:58:06,566 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 13:58:06,667 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-1.i[816,829] [2023-04-02 13:58:06,682 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 13:58:06,688 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 13:58:06,698 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy2_ground-1.i[816,829] [2023-04-02 13:58:06,704 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 13:58:06,713 INFO L208 MainTranslator]: Completed translation [2023-04-02 13:58:06,713 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06 WrapperNode [2023-04-02 13:58:06,713 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 13:58:06,714 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 13:58:06,714 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 13:58:06,714 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 13:58:06,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,728 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,728 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,744 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,747 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,748 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,749 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 13:58:06,759 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 13:58:06,759 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 13:58:06,759 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 13:58:06,760 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (1/1) ... [2023-04-02 13:58:06,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 13:58:06,778 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:06,789 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) [2023-04-02 13:58:06,796 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 [2023-04-02 13:58:06,816 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 13:58:06,816 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 13:58:06,816 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 13:58:06,816 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 13:58:06,816 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 13:58:06,816 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 13:58:06,816 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 13:58:06,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 13:58:06,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 13:58:06,878 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 13:58:06,879 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 13:58:07,045 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 13:58:07,134 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 13:58:07,134 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-02 13:58:07,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 01:58:07 BoogieIcfgContainer [2023-04-02 13:58:07,140 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 13:58:07,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 13:58:07,142 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 13:58:07,145 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 13:58:07,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 01:58:06" (1/3) ... [2023-04-02 13:58:07,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@207afbe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 01:58:07, skipping insertion in model container [2023-04-02 13:58:07,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 01:58:06" (2/3) ... [2023-04-02 13:58:07,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@207afbe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 01:58:07, skipping insertion in model container [2023-04-02 13:58:07,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 01:58:07" (3/3) ... [2023-04-02 13:58:07,147 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_copy2_ground-1.i [2023-04-02 13:58:07,161 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 13:58:07,161 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 13:58:07,215 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 13:58:07,222 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;@dc034e5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 13:58:07,223 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 13:58:07,226 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 13:58:07,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 13:58:07,232 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:07,233 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:07,233 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:07,240 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:07,240 INFO L85 PathProgramCache]: Analyzing trace with hash 533579906, now seen corresponding path program 1 times [2023-04-02 13:58:07,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:07,248 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612780859] [2023-04-02 13:58:07,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:07,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:07,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 13:58:07,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:07,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612780859] [2023-04-02 13:58:07,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612780859] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 13:58:07,525 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 13:58:07,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 13:58:07,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034301001] [2023-04-02 13:58:07,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 13:58:07,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 13:58:07,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:07,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 13:58:07,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 13:58:07,554 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:07,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:07,613 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2023-04-02 13:58:07,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 13:58:07,615 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-02 13:58:07,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:07,620 INFO L225 Difference]: With dead ends: 35 [2023-04-02 13:58:07,620 INFO L226 Difference]: Without dead ends: 18 [2023-04-02 13:58:07,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 13:58:07,629 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 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 [2023-04-02 13:58:07,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:07,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-02 13:58:07,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-02 13:58:07,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:07,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2023-04-02 13:58:07,656 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 13 [2023-04-02 13:58:07,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:07,657 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2023-04-02 13:58:07,657 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:07,657 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2023-04-02 13:58:07,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 13:58:07,658 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:07,658 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:07,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 13:58:07,658 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:07,659 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:07,659 INFO L85 PathProgramCache]: Analyzing trace with hash 875011814, now seen corresponding path program 1 times [2023-04-02 13:58:07,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:07,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343118214] [2023-04-02 13:58:07,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:07,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:07,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:07,771 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 13:58:07,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:07,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343118214] [2023-04-02 13:58:07,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343118214] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:07,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797128464] [2023-04-02 13:58:07,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:07,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:07,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:07,776 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) [2023-04-02 13:58:07,792 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 13:58:07,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:07,877 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 2 conjunts are in the unsatisfiable core [2023-04-02 13:58:07,881 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:07,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 13:58:07,907 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 13:58:07,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797128464] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 13:58:07,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 13:58:07,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-04-02 13:58:07,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973603553] [2023-04-02 13:58:07,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 13:58:07,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 13:58:07,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:07,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 13:58:07,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 13:58:07,921 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:07,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:07,952 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2023-04-02 13:58:07,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 13:58:07,954 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-02 13:58:07,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:07,954 INFO L225 Difference]: With dead ends: 30 [2023-04-02 13:58:07,954 INFO L226 Difference]: Without dead ends: 20 [2023-04-02 13:58:07,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 13:58:07,956 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:07,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:07,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-02 13:58:07,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-02 13:58:07,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:07,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-04-02 13:58:07,961 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2023-04-02 13:58:07,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:07,961 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-04-02 13:58:07,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:07,961 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-04-02 13:58:07,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 13:58:07,962 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:07,962 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:07,989 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:08,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:08,171 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:08,172 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:08,172 INFO L85 PathProgramCache]: Analyzing trace with hash 25376665, now seen corresponding path program 1 times [2023-04-02 13:58:08,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:08,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285857832] [2023-04-02 13:58:08,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:08,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:08,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:08,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 13:58:08,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:08,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285857832] [2023-04-02 13:58:08,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285857832] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:08,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858231231] [2023-04-02 13:58:08,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:08,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:08,310 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:08,313 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) [2023-04-02 13:58:08,323 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 13:58:08,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:08,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 13:58:08,416 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:08,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 13:58:08,446 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:08,478 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 13:58:08,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858231231] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:08,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [917672615] [2023-04-02 13:58:08,501 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:08,501 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:08,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:08,508 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:08,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:08,612 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:09,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:09,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:09,108 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:09,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '330#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_1| Int) (|v_main_~#a3~0.base_BEFORE_CALL_1| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_1|)) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_1|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_1|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_1|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_1|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_1|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_1|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_1| |v_main_~#a3~0.base_BEFORE_CALL_1|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:09,693 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:09,693 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:09,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 13:58:09,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137793014] [2023-04-02 13:58:09,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:09,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 13:58:09,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:09,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 13:58:09,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-02 13:58:09,696 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:09,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:09,722 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2023-04-02 13:58:09,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 13:58:09,722 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-04-02 13:58:09,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:09,724 INFO L225 Difference]: With dead ends: 36 [2023-04-02 13:58:09,724 INFO L226 Difference]: Without dead ends: 23 [2023-04-02 13:58:09,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-02 13:58:09,727 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:09,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:09,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-02 13:58:09,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-04-02 13:58:09,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:09,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-04-02 13:58:09,739 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2023-04-02 13:58:09,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:09,739 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-04-02 13:58:09,739 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:09,740 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-04-02 13:58:09,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 13:58:09,741 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:09,741 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:09,749 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:09,946 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,SelfDestructingSolverStorable2 [2023-04-02 13:58:09,947 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:09,947 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:09,947 INFO L85 PathProgramCache]: Analyzing trace with hash -469785803, now seen corresponding path program 2 times [2023-04-02 13:58:09,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:09,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401792831] [2023-04-02 13:58:09,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:09,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:09,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:10,058 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-02 13:58:10,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:10,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401792831] [2023-04-02 13:58:10,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401792831] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:10,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978809244] [2023-04-02 13:58:10,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 13:58:10,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:10,059 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:10,060 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) [2023-04-02 13:58:10,063 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 13:58:10,140 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 13:58:10,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:10,141 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 13:58:10,143 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:10,152 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-02 13:58:10,152 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:10,172 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-02 13:58:10,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978809244] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:10,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182002905] [2023-04-02 13:58:10,177 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:10,177 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:10,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:10,177 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:10,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:10,205 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:10,425 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:10,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:10,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:10,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '557#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_2| Int) (|v_main_~#a3~0.base_BEFORE_CALL_2| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_2|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_2|)) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_2| |v_main_~#a3~0.base_BEFORE_CALL_2|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_2|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_2|) 0))) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_2|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_2|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_2|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:10,963 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:10,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:10,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 13:58:10,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821350747] [2023-04-02 13:58:10,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:10,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 13:58:10,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:10,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 13:58:10,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-02 13:58:10,965 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:10,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:10,998 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-04-02 13:58:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 13:58:10,999 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-04-02 13:58:10,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:10,999 INFO L225 Difference]: With dead ends: 40 [2023-04-02 13:58:11,000 INFO L226 Difference]: Without dead ends: 29 [2023-04-02 13:58:11,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-02 13:58:11,001 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:11,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:11,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-02 13:58:11,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-04-02 13:58:11,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:11,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2023-04-02 13:58:11,005 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 19 [2023-04-02 13:58:11,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:11,005 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2023-04-02 13:58:11,005 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), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:11,005 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2023-04-02 13:58:11,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 13:58:11,006 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:11,006 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:11,017 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:11,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:11,212 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:11,212 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:11,212 INFO L85 PathProgramCache]: Analyzing trace with hash -943711294, now seen corresponding path program 3 times [2023-04-02 13:58:11,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:11,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940855362] [2023-04-02 13:58:11,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:11,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:11,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:11,517 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:11,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:11,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940855362] [2023-04-02 13:58:11,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940855362] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:11,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135487869] [2023-04-02 13:58:11,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 13:58:11,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:11,518 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:11,533 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) [2023-04-02 13:58:11,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 13:58:11,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 13:58:11,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:11,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 13:58:11,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:11,649 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:11,649 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:11,702 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:11,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135487869] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:11,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [960251701] [2023-04-02 13:58:11,705 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:11,705 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:11,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:11,706 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:11,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:11,721 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:11,891 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:11,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:11,927 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:12,454 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '846#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_3| Int) (|v_main_~#a3~0.base_BEFORE_CALL_3| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_3|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_3|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_3|) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_3|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_3| |v_main_~#a3~0.base_BEFORE_CALL_3|)) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_3|) 0))) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_3|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_3|)))) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:12,454 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:12,454 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:12,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-02 13:58:12,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574968040] [2023-04-02 13:58:12,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:12,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 13:58:12,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:12,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 13:58:12,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-04-02 13:58:12,456 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:12,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:12,497 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2023-04-02 13:58:12,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 13:58:12,498 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-04-02 13:58:12,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:12,498 INFO L225 Difference]: With dead ends: 54 [2023-04-02 13:58:12,498 INFO L226 Difference]: Without dead ends: 35 [2023-04-02 13:58:12,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2023-04-02 13:58:12,499 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:12,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:12,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-02 13:58:12,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-02 13:58:12,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:12,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2023-04-02 13:58:12,504 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 25 [2023-04-02 13:58:12,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:12,504 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2023-04-02 13:58:12,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:12,504 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2023-04-02 13:58:12,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 13:58:12,505 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:12,505 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:12,511 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:12,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:12,711 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:12,711 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:12,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1546067646, now seen corresponding path program 4 times [2023-04-02 13:58:12,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:12,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324117420] [2023-04-02 13:58:12,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:12,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:12,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:12,953 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:12,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:12,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324117420] [2023-04-02 13:58:12,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324117420] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:12,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664932838] [2023-04-02 13:58:12,954 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 13:58:12,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:12,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:12,955 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) [2023-04-02 13:58:12,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 13:58:13,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:13,074 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 13:58:13,075 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:13,095 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:13,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:13,269 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:13,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664932838] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:13,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653450638] [2023-04-02 13:58:13,271 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:13,271 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:13,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:13,271 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:13,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:13,285 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:13,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:13,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:13,461 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:13,973 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1223#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_4| Int) (|v_main_~#a3~0.base_BEFORE_CALL_4| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_4|)) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_4|) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_4|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_4|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_4|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_4| |v_main_~#a3~0.base_BEFORE_CALL_4|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_4|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_4|))) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:13,973 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:13,973 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:13,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-02 13:58:13,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667762402] [2023-04-02 13:58:13,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:13,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 13:58:13,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:13,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 13:58:13,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=920, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 13:58:13,979 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:14,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:14,037 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2023-04-02 13:58:14,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 13:58:14,038 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-04-02 13:58:14,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:14,040 INFO L225 Difference]: With dead ends: 66 [2023-04-02 13:58:14,040 INFO L226 Difference]: Without dead ends: 47 [2023-04-02 13:58:14,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=920, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 13:58:14,041 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:14,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 13:58:14,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-02 13:58:14,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-04-02 13:58:14,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:14,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2023-04-02 13:58:14,052 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 31 [2023-04-02 13:58:14,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:14,052 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2023-04-02 13:58:14,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:14,052 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2023-04-02 13:58:14,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 13:58:14,055 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:14,055 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:14,061 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:14,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:14,261 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:14,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:14,262 INFO L85 PathProgramCache]: Analyzing trace with hash 977538114, now seen corresponding path program 5 times [2023-04-02 13:58:14,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:14,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030996748] [2023-04-02 13:58:14,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:14,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:14,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:14,987 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-02 13:58:14,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:14,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030996748] [2023-04-02 13:58:14,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030996748] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:14,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25674076] [2023-04-02 13:58:14,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 13:58:14,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:14,988 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:14,989 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) [2023-04-02 13:58:14,992 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 13:58:15,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 13:58:15,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:15,129 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 13:58:15,131 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:15,197 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2023-04-02 13:58:15,197 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:15,286 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2023-04-02 13:58:15,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25674076] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:15,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [172726904] [2023-04-02 13:58:15,288 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:15,288 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:15,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:15,289 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:15,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:15,302 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:15,470 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:15,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:15,487 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:16,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1730#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a3~0.base_BEFORE_CALL_5| Int) (|v_main_~#a1~0.base_BEFORE_CALL_5| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_5|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_5|) 0))) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_5|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_5|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_5|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_5|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_5|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_5| |v_main_~#a3~0.base_BEFORE_CALL_5|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_5|))) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:16,127 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:16,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:16,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2023-04-02 13:58:16,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224014805] [2023-04-02 13:58:16,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:16,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 13:58:16,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:16,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 13:58:16,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=1665, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 13:58:16,129 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 35 states, 35 states have (on average 1.4) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:16,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:16,228 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2023-04-02 13:58:16,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-04-02 13:58:16,228 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2023-04-02 13:58:16,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:16,230 INFO L225 Difference]: With dead ends: 79 [2023-04-02 13:58:16,230 INFO L226 Difference]: Without dead ends: 60 [2023-04-02 13:58:16,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=405, Invalid=1665, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 13:58:16,232 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:16,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 13:58:16,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-02 13:58:16,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-04-02 13:58:16,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:16,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2023-04-02 13:58:16,243 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 43 [2023-04-02 13:58:16,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:16,244 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2023-04-02 13:58:16,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4) internal successors, (49), 35 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:16,244 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2023-04-02 13:58:16,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 13:58:16,245 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:16,245 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:16,259 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 13:58:16,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:16,451 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:16,452 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:16,452 INFO L85 PathProgramCache]: Analyzing trace with hash 216869126, now seen corresponding path program 6 times [2023-04-02 13:58:16,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:16,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841418482] [2023-04-02 13:58:16,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:16,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:16,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:17,203 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:17,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:17,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841418482] [2023-04-02 13:58:17,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841418482] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:17,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265734955] [2023-04-02 13:58:17,204 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 13:58:17,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:17,204 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:17,205 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) [2023-04-02 13:58:17,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 13:58:17,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 13:58:17,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:17,386 INFO L262 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-02 13:58:17,389 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:17,438 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:17,439 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:18,104 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:18,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265734955] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:18,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426396494] [2023-04-02 13:58:18,107 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:18,107 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:18,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:18,107 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:18,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:18,134 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:18,311 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:18,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:18,325 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:18,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2383#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a3~0.base_BEFORE_CALL_6| Int) (|v_main_~#a1~0.base_BEFORE_CALL_6| Int)) (and (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_6|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_6| |v_main_~#a3~0.base_BEFORE_CALL_6|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_6|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_6|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_6|) (not (= (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_6|) 0))) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_6|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_6|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:18,847 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:18,847 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:18,848 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2023-04-02 13:58:18,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047635489] [2023-04-02 13:58:18,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:18,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-02 13:58:18,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:18,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-02 13:58:18,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1315, Invalid=2467, Unknown=0, NotChecked=0, Total=3782 [2023-04-02 13:58:18,851 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:18,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:18,954 INFO L93 Difference]: Finished difference Result 116 states and 146 transitions. [2023-04-02 13:58:18,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-04-02 13:58:18,955 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2023-04-02 13:58:18,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:18,956 INFO L225 Difference]: With dead ends: 116 [2023-04-02 13:58:18,956 INFO L226 Difference]: Without dead ends: 85 [2023-04-02 13:58:18,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1315, Invalid=2467, Unknown=0, NotChecked=0, Total=3782 [2023-04-02 13:58:18,957 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:18,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 100 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 13:58:18,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2023-04-02 13:58:18,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2023-04-02 13:58:18,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 79 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:18,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2023-04-02 13:58:18,963 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 56 [2023-04-02 13:58:18,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:18,964 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2023-04-02 13:58:18,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:18,964 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2023-04-02 13:58:18,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-04-02 13:58:18,965 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:18,965 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:18,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:19,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:19,169 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:19,169 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:19,170 INFO L85 PathProgramCache]: Analyzing trace with hash 730927650, now seen corresponding path program 7 times [2023-04-02 13:58:19,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:19,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485060068] [2023-04-02 13:58:19,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:19,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:19,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:21,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:21,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:21,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485060068] [2023-04-02 13:58:21,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485060068] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:21,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728012404] [2023-04-02 13:58:21,445 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 13:58:21,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:21,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:21,449 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 13:58:21,475 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 13:58:21,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:21,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 50 conjunts are in the unsatisfiable core [2023-04-02 13:58:21,777 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:21,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:21,852 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:24,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:24,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728012404] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:24,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1851481869] [2023-04-02 13:58:24,313 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:24,313 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:24,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:24,314 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:24,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:24,330 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:24,520 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:24,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:24,536 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:25,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3360#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a3~0.base_BEFORE_CALL_7| Int) (|v_main_~#a1~0.base_BEFORE_CALL_7| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_7|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_7|)) (not (= (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_7|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_7|) 0))) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_7| |v_main_~#a3~0.base_BEFORE_CALL_7|)) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_7|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_7|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_7|)) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_7|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:25,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:25,209 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:25,210 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2023-04-02 13:58:25,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275201287] [2023-04-02 13:58:25,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:25,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-04-02 13:58:25,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:25,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-04-02 13:58:25,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5090, Invalid=7342, Unknown=0, NotChecked=0, Total=12432 [2023-04-02 13:58:25,215 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 101 states have internal predecessors, (111), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:25,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:25,362 INFO L93 Difference]: Finished difference Result 166 states and 221 transitions. [2023-04-02 13:58:25,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-04-02 13:58:25,362 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 101 states have internal predecessors, (111), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2023-04-02 13:58:25,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:25,365 INFO L225 Difference]: With dead ends: 166 [2023-04-02 13:58:25,365 INFO L226 Difference]: Without dead ends: 135 [2023-04-02 13:58:25,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1822 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5090, Invalid=7342, Unknown=0, NotChecked=0, Total=12432 [2023-04-02 13:58:25,370 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:25,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 13:58:25,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-04-02 13:58:25,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2023-04-02 13:58:25,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:25,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 138 transitions. [2023-04-02 13:58:25,390 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 138 transitions. Word has length 81 [2023-04-02 13:58:25,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:25,390 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 138 transitions. [2023-04-02 13:58:25,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.099009900990099) internal successors, (111), 101 states have internal predecessors, (111), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:25,391 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 138 transitions. [2023-04-02 13:58:25,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-04-02 13:58:25,392 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:25,392 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:25,402 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:25,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 13:58:25,593 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:25,593 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:25,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1273580194, now seen corresponding path program 8 times [2023-04-02 13:58:25,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:25,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985793156] [2023-04-02 13:58:25,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:25,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:32,526 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-04-02 13:58:32,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:32,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985793156] [2023-04-02 13:58:32,526 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985793156] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:32,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145348285] [2023-04-02 13:58:32,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 13:58:32,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:32,526 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:32,527 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 13:58:32,529 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 13:58:34,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 13:58:34,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:34,745 INFO L262 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 13:58:34,748 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4906 trivial. 0 not checked. [2023-04-02 13:58:35,188 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:35,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4906 trivial. 0 not checked. [2023-04-02 13:58:35,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145348285] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:35,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730842963] [2023-04-02 13:58:35,725 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:35,725 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:35,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:35,726 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:35,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:35,738 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:35,876 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:35,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:35,891 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:36,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4859#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a3~0.base_BEFORE_CALL_8| Int) (|v_main_~#a1~0.base_BEFORE_CALL_8| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_8|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_8|) 0))) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_8|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_8|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_8|) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_8|) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_8|) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_8| |v_main_~#a3~0.base_BEFORE_CALL_8|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_8|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:36,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:36,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:36,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 13, 13] total 123 [2023-04-02 13:58:36,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529594388] [2023-04-02 13:58:36,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:36,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2023-04-02 13:58:36,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:37,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2023-04-02 13:58:37,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=12457, Unknown=0, NotChecked=0, Total=17822 [2023-04-02 13:58:37,005 INFO L87 Difference]: Start difference. First operand 135 states and 138 transitions. Second operand has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:37,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:37,227 INFO L93 Difference]: Finished difference Result 191 states and 221 transitions. [2023-04-02 13:58:37,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2023-04-02 13:58:37,228 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2023-04-02 13:58:37,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:37,229 INFO L225 Difference]: With dead ends: 191 [2023-04-02 13:58:37,229 INFO L226 Difference]: Without dead ends: 160 [2023-04-02 13:58:37,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3588 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5365, Invalid=12457, Unknown=0, NotChecked=0, Total=17822 [2023-04-02 13:58:37,232 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:37,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 13:58:37,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-04-02 13:58:37,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2023-04-02 13:58:37,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 154 states have (on average 1.025974025974026) internal successors, (158), 154 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:37,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 163 transitions. [2023-04-02 13:58:37,239 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 163 transitions. Word has length 131 [2023-04-02 13:58:37,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:37,240 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 163 transitions. [2023-04-02 13:58:37,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:37,240 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 163 transitions. [2023-04-02 13:58:37,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-04-02 13:58:37,242 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:37,242 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:37,253 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:37,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 13:58:37,453 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:37,453 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:37,453 INFO L85 PathProgramCache]: Analyzing trace with hash 388055238, now seen corresponding path program 9 times [2023-04-02 13:58:37,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:37,454 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16756277] [2023-04-02 13:58:37,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:37,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:37,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:58:43,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 13:58:43,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:58:43,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16756277] [2023-04-02 13:58:43,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16756277] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:58:43,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477399385] [2023-04-02 13:58:43,746 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 13:58:43,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:58:43,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:58:43,747 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 13:58:43,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 13:58:44,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 13:58:44,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 13:58:44,351 INFO L262 TraceCheckSpWp]: Trace formula consists of 2092 conjuncts, 101 conjunts are in the unsatisfiable core [2023-04-02 13:58:44,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:58:44,517 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 13:58:44,518 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 13:58:54,720 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 13:58:54,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477399385] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 13:58:54,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715090086] [2023-04-02 13:58:54,722 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 13:58:54,722 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 13:58:54,722 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 13:58:54,722 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 13:58:54,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 13:58:54,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 13:58:54,873 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 13:58:54,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 13:58:54,888 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 13:58:55,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6688#(and (exists ((|v_main_~#a3~0.base_BEFORE_CALL_9| Int) (|v_main_~#a1~0.base_BEFORE_CALL_9| Int)) (and (<= 3 (+ |#StackHeapBarrier| |v_main_~#a1~0.base_BEFORE_CALL_9|)) (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_9| |v_main_~#a3~0.base_BEFORE_CALL_9|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_9|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_9|) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_9|) (not (= (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_9|) 0) (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_9|) 0))) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_9|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_9|)))) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 13:58:55,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 13:58:55,953 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 13:58:55,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 203 [2023-04-02 13:58:55,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606199207] [2023-04-02 13:58:55,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 13:58:55,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2023-04-02 13:58:55,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 13:58:55,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2023-04-02 13:58:55,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20543, Invalid=25039, Unknown=0, NotChecked=0, Total=45582 [2023-04-02 13:58:55,963 INFO L87 Difference]: Start difference. First operand 160 states and 163 transitions. Second operand has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 203 states have internal predecessors, (213), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:56,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 13:58:56,316 INFO L93 Difference]: Finished difference Result 316 states and 422 transitions. [2023-04-02 13:58:56,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2023-04-02 13:58:56,319 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 203 states have internal predecessors, (213), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 156 [2023-04-02 13:58:56,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 13:58:56,324 INFO L225 Difference]: With dead ends: 316 [2023-04-02 13:58:56,324 INFO L226 Difference]: Without dead ends: 261 [2023-04-02 13:58:56,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 569 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=20543, Invalid=25039, Unknown=0, NotChecked=0, Total=45582 [2023-04-02 13:58:56,329 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 13:58:56,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 78 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 13:58:56,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2023-04-02 13:58:56,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2023-04-02 13:58:56,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 255 states have (on average 1.0156862745098039) internal successors, (259), 255 states have internal predecessors, (259), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 13:58:56,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 264 transitions. [2023-04-02 13:58:56,345 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 264 transitions. Word has length 156 [2023-04-02 13:58:56,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 13:58:56,347 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 264 transitions. [2023-04-02 13:58:56,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 203 states have internal predecessors, (213), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 13:58:56,348 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 264 transitions. [2023-04-02 13:58:56,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2023-04-02 13:58:56,359 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 13:58:56,359 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 13:58:56,373 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 13:58:56,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 13:58:56,570 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 13:58:56,570 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 13:58:56,570 INFO L85 PathProgramCache]: Analyzing trace with hash 133523170, now seen corresponding path program 10 times [2023-04-02 13:58:56,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 13:58:56,570 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838459445] [2023-04-02 13:58:56,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 13:58:56,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 13:58:56,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:59:20,279 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 13:59:20,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 13:59:20,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838459445] [2023-04-02 13:59:20,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838459445] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 13:59:20,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133880644] [2023-04-02 13:59:20,280 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 13:59:20,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 13:59:20,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 13:59:20,281 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 13:59:20,282 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 13:59:21,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 13:59:21,246 INFO L262 TraceCheckSpWp]: Trace formula consists of 3809 conjuncts, 202 conjunts are in the unsatisfiable core [2023-04-02 13:59:21,253 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 13:59:21,529 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 13:59:21,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:00:00,560 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 14:00:00,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133880644] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:00:00,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711035921] [2023-04-02 14:00:00,562 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 14:00:00,562 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:00:00,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:00:00,562 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:00:00,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:00:00,579 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:00:00,705 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:00:00,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:00:00,719 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:00:02,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9777#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a1~0.base_BEFORE_CALL_10| Int) (|v_main_~#a3~0.base_BEFORE_CALL_10| Int)) (and (<= 4 (+ |v_main_~#a1~0.base_BEFORE_CALL_10| |v_main_~#a3~0.base_BEFORE_CALL_10|)) (<= 2 |v_main_~#a1~0.base_BEFORE_CALL_10|) (<= 3 (+ |v_main_~#a1~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a3~0.base_BEFORE_CALL_10|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a1~0.base_BEFORE_CALL_10|) (not (= (select (select |#memory_int| |v_main_~#a1~0.base_BEFORE_CALL_10|) 0) (select (select |#memory_int| |v_main_~#a3~0.base_BEFORE_CALL_10|) 0))) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a3~0.base_BEFORE_CALL_10|)) (<= 2 |v_main_~#a3~0.base_BEFORE_CALL_10|))) (= |#NULL.base| 0))' at error location [2023-04-02 14:00:02,558 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:00:02,558 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:00:02,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [203, 203, 203] total 405 [2023-04-02 14:00:02,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734615678] [2023-04-02 14:00:02,558 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:00:02,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2023-04-02 14:00:02,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:00:02,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2023-04-02 14:00:02,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81850, Invalid=90790, Unknown=0, NotChecked=0, Total=172640 [2023-04-02 14:00:02,580 INFO L87 Difference]: Start difference. First operand 261 states and 264 transitions. Second operand has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 405 states have internal predecessors, (415), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:00:04,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:00:04,450 INFO L93 Difference]: Finished difference Result 518 states and 725 transitions. [2023-04-02 14:00:04,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2023-04-02 14:00:04,450 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 405 states have internal predecessors, (415), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 257 [2023-04-02 14:00:04,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:00:04,452 INFO L225 Difference]: With dead ends: 518 [2023-04-02 14:00:04,452 INFO L226 Difference]: Without dead ends: 463 [2023-04-02 14:00:04,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 559 SyntacticMatches, 0 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7446 ImplicationChecksByTransitivity, 53.8s TimeCoverageRelationStatistics Valid=81850, Invalid=90790, Unknown=0, NotChecked=0, Total=172640 [2023-04-02 14:00:04,459 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:00:04,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 144 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:00:04,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2023-04-02 14:00:04,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 463. [2023-04-02 14:00:04,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 457 states have (on average 1.0087527352297594) internal successors, (461), 457 states have internal predecessors, (461), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:00:04,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 466 transitions. [2023-04-02 14:00:04,475 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 466 transitions. Word has length 257 [2023-04-02 14:00:04,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:00:04,476 INFO L495 AbstractCegarLoop]: Abstraction has 463 states and 466 transitions. [2023-04-02 14:00:04,476 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.0246913580246915) internal successors, (415), 405 states have internal predecessors, (415), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:00:04,477 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 466 transitions. [2023-04-02 14:00:04,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2023-04-02 14:00:04,483 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:00:04,483 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:00:04,501 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 14:00:04,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 14:00:04,697 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:00:04,698 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:00:04,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1766364514, now seen corresponding path program 11 times [2023-04-02 14:00:04,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:00:04,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155913899] [2023-04-02 14:00:04,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:00:04,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:00:05,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:01:42,901 INFO L134 CoverageAnalysis]: Checked inductivity of 81509 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-04-02 14:01:42,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:01:42,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155913899] [2023-04-02 14:01:42,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155913899] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:01:42,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841247756] [2023-04-02 14:01:42,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:01:42,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:01:42,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:01:42,908 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:01:42,909 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process