/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 IntervalDomain -i ../sv-benchmarks/c/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:01:32,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:01:32,694 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:01:32,723 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-03-31 23:01:32,759 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:01:32,759 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:01:32,760 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:01:32,761 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 [2023-03-31 23:01:32,785 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:01:32,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:01:32,786 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:01:32,786 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:01:32,787 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:01:32,787 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:01:32,787 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:01:32,787 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:01:32,787 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:01:32,787 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:01:32,788 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:01:32,788 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:01:32,789 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:01:32,789 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:01:32,790 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:01:32,790 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:01:32,791 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:01:32,791 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:01:32,791 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:01:32,934 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:01:32,963 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:01:32,965 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:01:32,966 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:01:32,967 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:01:32,967 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2023-03-31 23:01:33,897 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:01:34,087 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:01:34,088 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2023-03-31 23:01:34,093 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb6ef2e3a/6df4d4e7a6ca4cd0ada2a66c90b2843a/FLAG3379db0f1 [2023-03-31 23:01:34,106 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb6ef2e3a/6df4d4e7a6ca4cd0ada2a66c90b2843a [2023-03-31 23:01:34,108 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:01:34,110 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:01:34,112 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:01:34,112 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:01:34,114 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:01:34,115 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,116 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62f7edbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34, skipping insertion in model container [2023-03-31 23:01:34,116 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,120 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:01:34,130 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:01:34,244 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2023-03-31 23:01:34,260 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:01:34,268 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:01:34,276 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2023-03-31 23:01:34,279 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:01:34,288 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:01:34,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34 WrapperNode [2023-03-31 23:01:34,288 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:01:34,289 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:01:34,289 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:01:34,289 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:01:34,296 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,296 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,300 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,300 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,310 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,311 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,312 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:01:34,313 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:01:34,313 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:01:34,316 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:01:34,317 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (1/1) ... [2023-03-31 23:01:34,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:01:34,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:34,336 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 23:01:34,337 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 23:01:34,360 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:01:34,360 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:01:34,360 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:01:34,360 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 23:01:34,360 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:01:34,361 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:01:34,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:01:34,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:01:34,362 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:01:34,362 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:01:34,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:01:34,448 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:01:34,449 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:01:34,621 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:01:34,650 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:01:34,650 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-03-31 23:01:34,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:01:34 BoogieIcfgContainer [2023-03-31 23:01:34,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:01:34,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:01:34,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:01:34,656 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:01:34,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:01:34" (1/3) ... [2023-03-31 23:01:34,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29eca4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:01:34, skipping insertion in model container [2023-03-31 23:01:34,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:01:34" (2/3) ... [2023-03-31 23:01:34,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29eca4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:01:34, skipping insertion in model container [2023-03-31 23:01:34,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:01:34" (3/3) ... [2023-03-31 23:01:34,664 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2023-03-31 23:01:34,676 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:01:34,676 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:01:34,713 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:01:34,718 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;@28ee4130, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:01:34,718 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:01:34,721 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:01:34,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 23:01:34,725 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:34,726 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:34,726 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:34,729 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:34,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1118347807, now seen corresponding path program 1 times [2023-03-31 23:01:34,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:34,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174266762] [2023-03-31 23:01:34,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:34,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:34,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:34,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174266762] [2023-03-31 23:01:34,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174266762] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:01:34,821 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:01:34,821 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-03-31 23:01:34,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172666057] [2023-03-31 23:01:34,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:01:34,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-03-31 23:01:34,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:34,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-03-31 23:01:34,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-03-31 23:01:34,845 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 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 2 states, 2 states have (on average 5.0) internal successors, (10), 2 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) [2023-03-31 23:01:34,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:34,862 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2023-03-31 23:01:34,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-03-31 23:01:34,864 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 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 [2023-03-31 23:01:34,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:34,868 INFO L225 Difference]: With dead ends: 43 [2023-03-31 23:01:34,868 INFO L226 Difference]: Without dead ends: 21 [2023-03-31 23:01:34,870 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-03-31 23:01:34,877 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:34,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:34,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-03-31 23:01:34,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-03-31 23:01:34,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 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) [2023-03-31 23:01:34,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-03-31 23:01:34,898 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2023-03-31 23:01:34,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:34,899 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-03-31 23:01:34,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 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) [2023-03-31 23:01:34,899 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-03-31 23:01:34,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-03-31 23:01:34,899 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:34,899 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:34,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:01:34,900 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:34,900 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:34,900 INFO L85 PathProgramCache]: Analyzing trace with hash -1096390437, now seen corresponding path program 1 times [2023-03-31 23:01:34,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:34,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248098052] [2023-03-31 23:01:34,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:34,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:35,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:35,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:35,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248098052] [2023-03-31 23:01:35,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248098052] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:01:35,050 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:01:35,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 23:01:35,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757256942] [2023-03-31 23:01:35,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:01:35,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 23:01:35,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:35,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 23:01:35,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 23:01:35,053 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:01:35,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:35,097 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2023-03-31 23:01:35,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 23:01:35,097 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 [2023-03-31 23:01:35,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:35,098 INFO L225 Difference]: With dead ends: 30 [2023-03-31 23:01:35,098 INFO L226 Difference]: Without dead ends: 28 [2023-03-31 23:01:35,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-03-31 23:01:35,103 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:35,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 54 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:35,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-03-31 23:01:35,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2023-03-31 23:01:35,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:01:35,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2023-03-31 23:01:35,113 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 16 [2023-03-31 23:01:35,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:35,113 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2023-03-31 23:01:35,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:01:35,114 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2023-03-31 23:01:35,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-03-31 23:01:35,114 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:35,115 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:35,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 23:01:35,115 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:35,116 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:35,116 INFO L85 PathProgramCache]: Analyzing trace with hash -1800333969, now seen corresponding path program 1 times [2023-03-31 23:01:35,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:35,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920345229] [2023-03-31 23:01:35,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:35,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:35,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:35,249 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:35,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:35,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920345229] [2023-03-31 23:01:35,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920345229] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:01:35,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:01:35,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 23:01:35,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946307863] [2023-03-31 23:01:35,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:01:35,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 23:01:35,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:35,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 23:01:35,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 23:01:35,252 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 23:01:35,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:35,309 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2023-03-31 23:01:35,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 23:01:35,311 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-03-31 23:01:35,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:35,313 INFO L225 Difference]: With dead ends: 47 [2023-03-31 23:01:35,313 INFO L226 Difference]: Without dead ends: 32 [2023-03-31 23:01:35,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-03-31 23:01:35,314 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 4 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:35,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 54 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:35,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-03-31 23:01:35,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2023-03-31 23:01:35,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:01:35,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2023-03-31 23:01:35,320 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2023-03-31 23:01:35,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:35,320 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2023-03-31 23:01:35,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 23:01:35,320 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2023-03-31 23:01:35,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-03-31 23:01:35,321 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:35,321 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:35,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-03-31 23:01:35,321 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:35,322 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:35,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1819087476, now seen corresponding path program 1 times [2023-03-31 23:01:35,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:35,322 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466102622] [2023-03-31 23:01:35,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:35,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:35,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:35,404 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:35,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:35,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466102622] [2023-03-31 23:01:35,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466102622] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:35,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140942011] [2023-03-31 23:01:35,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:35,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:35,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:35,407 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:35,408 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 23:01:35,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:35,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 23:01:35,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:35,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:35,551 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:35,634 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:01:35,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140942011] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:35,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [902974038] [2023-03-31 23:01:35,647 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:35,647 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:35,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:35,654 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:35,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:35,732 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:35,974 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:36,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:36,007 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:36,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '485#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:36,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:36,404 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:36,404 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 13 [2023-03-31 23:01:36,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609046257] [2023-03-31 23:01:36,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:36,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 23:01:36,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:36,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 23:01:36,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2023-03-31 23:01:36,407 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:36,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:36,529 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2023-03-31 23:01:36,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 23:01:36,530 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2023-03-31 23:01:36,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:36,530 INFO L225 Difference]: With dead ends: 61 [2023-03-31 23:01:36,530 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 23:01:36,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 23:01:36,532 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 18 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:36,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:36,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 23:01:36,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2023-03-31 23:01:36,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 29 states have (on average 1.103448275862069) internal successors, (32), 30 states have internal predecessors, (32), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:36,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2023-03-31 23:01:36,537 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 26 [2023-03-31 23:01:36,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:36,537 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2023-03-31 23:01:36,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:36,537 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2023-03-31 23:01:36,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 23:01:36,538 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:36,538 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:36,545 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:36,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:36,743 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:36,743 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:36,743 INFO L85 PathProgramCache]: Analyzing trace with hash 2109755597, now seen corresponding path program 2 times [2023-03-31 23:01:36,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:36,743 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479716973] [2023-03-31 23:01:36,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:36,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:36,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:36,878 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:36,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:36,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479716973] [2023-03-31 23:01:36,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479716973] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:36,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889574965] [2023-03-31 23:01:36,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:36,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:36,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:36,880 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:36,919 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 23:01:36,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 23:01:36,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:36,931 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 23:01:36,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:36,991 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:36,991 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:37,035 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:37,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889574965] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:37,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343951384] [2023-03-31 23:01:37,039 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:37,039 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:37,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:37,039 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:37,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:37,073 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:37,193 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:37,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:37,217 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:37,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '880#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:37,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:37,508 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:37,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-03-31 23:01:37,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114191216] [2023-03-31 23:01:37,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:37,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 23:01:37,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:37,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 23:01:37,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2023-03-31 23:01:37,510 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:37,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:37,586 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2023-03-31 23:01:37,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 23:01:37,587 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 36 [2023-03-31 23:01:37,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:37,588 INFO L225 Difference]: With dead ends: 69 [2023-03-31 23:01:37,588 INFO L226 Difference]: Without dead ends: 50 [2023-03-31 23:01:37,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 85 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2023-03-31 23:01:37,589 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 14 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:37,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 93 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:37,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-03-31 23:01:37,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2023-03-31 23:01:37,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.096774193548387) internal successors, (34), 32 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:37,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-03-31 23:01:37,593 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 36 [2023-03-31 23:01:37,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:37,594 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-03-31 23:01:37,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:37,594 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-03-31 23:01:37,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-03-31 23:01:37,594 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:37,594 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:37,616 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:37,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:37,799 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:37,800 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:37,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1158156718, now seen corresponding path program 3 times [2023-03-31 23:01:37,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:37,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516767789] [2023-03-31 23:01:37,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:37,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:37,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:37,881 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:37,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:37,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516767789] [2023-03-31 23:01:37,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [516767789] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:37,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456381755] [2023-03-31 23:01:37,881 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:37,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:37,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:37,882 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:37,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 23:01:37,918 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:37,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:37,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 23:01:37,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:37,972 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:37,972 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:38,019 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 23:01:38,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456381755] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:38,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746007001] [2023-03-31 23:01:38,020 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:38,020 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:38,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:38,021 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:38,021 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:38,045 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:38,178 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:38,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:38,204 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:38,502 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1293#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:38,502 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:38,502 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:38,502 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2023-03-31 23:01:38,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145456352] [2023-03-31 23:01:38,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:38,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-03-31 23:01:38,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:38,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-03-31 23:01:38,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2023-03-31 23:01:38,504 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 10 states have internal predecessors, (46), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:38,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:38,557 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2023-03-31 23:01:38,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-03-31 23:01:38,558 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 10 states have internal predecessors, (46), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 38 [2023-03-31 23:01:38,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:38,559 INFO L225 Difference]: With dead ends: 60 [2023-03-31 23:01:38,559 INFO L226 Difference]: Without dead ends: 58 [2023-03-31 23:01:38,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2023-03-31 23:01:38,561 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 14 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:38,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 102 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:38,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-03-31 23:01:38,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2023-03-31 23:01:38,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.075) internal successors, (43), 41 states have internal predecessors, (43), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:38,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2023-03-31 23:01:38,569 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 38 [2023-03-31 23:01:38,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:38,569 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2023-03-31 23:01:38,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 10 states have internal predecessors, (46), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 23:01:38,569 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2023-03-31 23:01:38,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-03-31 23:01:38,571 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:38,571 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:38,575 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-03-31 23:01:38,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:38,773 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:38,774 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:38,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1820173690, now seen corresponding path program 4 times [2023-03-31 23:01:38,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:38,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117276084] [2023-03-31 23:01:38,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:38,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:38,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:38,886 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 21 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:38,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:38,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117276084] [2023-03-31 23:01:38,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117276084] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:38,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842872935] [2023-03-31 23:01:38,887 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:01:38,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:38,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:38,889 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) [2023-03-31 23:01:38,891 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 23:01:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:38,936 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 23:01:38,942 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:39,018 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 48 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-03-31 23:01:39,018 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-03-31 23:01:39,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842872935] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:39,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1442744664] [2023-03-31 23:01:39,090 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:39,090 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:39,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:39,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:39,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:39,102 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:39,197 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:39,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:39,215 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:39,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1808#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:39,552 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:39,552 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:39,552 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 17 [2023-03-31 23:01:39,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278620332] [2023-03-31 23:01:39,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:39,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-03-31 23:01:39,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:39,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-03-31 23:01:39,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2023-03-31 23:01:39,553 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2023-03-31 23:01:39,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:39,645 INFO L93 Difference]: Finished difference Result 96 states and 107 transitions. [2023-03-31 23:01:39,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 23:01:39,645 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 54 [2023-03-31 23:01:39,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:39,646 INFO L225 Difference]: With dead ends: 96 [2023-03-31 23:01:39,646 INFO L226 Difference]: Without dead ends: 67 [2023-03-31 23:01:39,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 136 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=170, Invalid=1020, Unknown=0, NotChecked=0, Total=1190 [2023-03-31 23:01:39,647 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 24 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:39,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 87 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:39,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-03-31 23:01:39,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 55. [2023-03-31 23:01:39,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 43 states have internal predecessors, (45), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:39,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2023-03-31 23:01:39,651 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 54 [2023-03-31 23:01:39,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:39,651 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2023-03-31 23:01:39,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2023-03-31 23:01:39,652 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2023-03-31 23:01:39,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-03-31 23:01:39,652 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:39,652 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:39,673 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:39,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:39,853 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:39,854 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:39,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1049834561, now seen corresponding path program 5 times [2023-03-31 23:01:39,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:39,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020776133] [2023-03-31 23:01:39,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:39,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:39,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:39,965 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 31 proven. 29 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:39,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:39,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020776133] [2023-03-31 23:01:39,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020776133] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:39,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107760671] [2023-03-31 23:01:39,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:39,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:39,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:39,966 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) [2023-03-31 23:01:39,967 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 23:01:40,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-03-31 23:01:40,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:40,009 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 23:01:40,010 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:40,103 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 40 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:40,103 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:40,175 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 40 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:40,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107760671] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:40,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151128087] [2023-03-31 23:01:40,177 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:40,177 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:40,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:40,177 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:40,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:40,186 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:40,293 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:40,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:40,326 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:40,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2397#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:40,646 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:40,646 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:40,646 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2023-03-31 23:01:40,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729157511] [2023-03-31 23:01:40,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:40,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-03-31 23:01:40,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:40,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-03-31 23:01:40,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=908, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 23:01:40,648 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:40,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:40,755 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2023-03-31 23:01:40,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 23:01:40,755 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 56 [2023-03-31 23:01:40,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:40,756 INFO L225 Difference]: With dead ends: 99 [2023-03-31 23:01:40,756 INFO L226 Difference]: Without dead ends: 72 [2023-03-31 23:01:40,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 139 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=1196, Unknown=0, NotChecked=0, Total=1406 [2023-03-31 23:01:40,757 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 32 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:40,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 117 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:40,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-03-31 23:01:40,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 57. [2023-03-31 23:01:40,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:40,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2023-03-31 23:01:40,762 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 56 [2023-03-31 23:01:40,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:40,762 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2023-03-31 23:01:40,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:40,762 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2023-03-31 23:01:40,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-03-31 23:01:40,763 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:40,763 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:40,769 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:40,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:40,968 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:40,969 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:40,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1758759740, now seen corresponding path program 6 times [2023-03-31 23:01:40,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:40,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670701718] [2023-03-31 23:01:40,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:40,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:40,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:41,071 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:41,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:41,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670701718] [2023-03-31 23:01:41,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670701718] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:41,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084518125] [2023-03-31 23:01:41,071 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:41,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:41,071 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:41,072 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) [2023-03-31 23:01:41,085 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 23:01:41,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:41,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:41,123 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2023-03-31 23:01:41,125 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:41,176 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 38 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:41,176 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 38 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:01:41,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084518125] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:41,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483535036] [2023-03-31 23:01:41,270 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:41,270 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:41,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:41,271 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:41,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:41,282 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:41,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:41,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:41,370 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:41,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3002#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:41,661 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:41,661 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:41,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 14 [2023-03-31 23:01:41,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123189380] [2023-03-31 23:01:41,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:41,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 23:01:41,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:41,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 23:01:41,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2023-03-31 23:01:41,663 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 12 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:41,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:41,744 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2023-03-31 23:01:41,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 23:01:41,745 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 12 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 58 [2023-03-31 23:01:41,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:41,747 INFO L225 Difference]: With dead ends: 76 [2023-03-31 23:01:41,747 INFO L226 Difference]: Without dead ends: 74 [2023-03-31 23:01:41,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 152 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2023-03-31 23:01:41,749 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:41,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 135 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:41,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-03-31 23:01:41,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 69. [2023-03-31 23:01:41,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 54 states have internal predecessors, (56), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-03-31 23:01:41,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2023-03-31 23:01:41,766 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 58 [2023-03-31 23:01:41,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:41,769 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2023-03-31 23:01:41,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 12 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:01:41,769 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2023-03-31 23:01:41,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-03-31 23:01:41,770 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:41,770 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:41,778 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:41,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:41,978 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:41,978 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:41,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1485441004, now seen corresponding path program 7 times [2023-03-31 23:01:41,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:41,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278677598] [2023-03-31 23:01:41,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:41,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:41,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:42,127 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 69 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:42,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:42,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278677598] [2023-03-31 23:01:42,127 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278677598] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:42,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978766011] [2023-03-31 23:01:42,127 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:01:42,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:42,128 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:42,129 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) [2023-03-31 23:01:42,131 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 23:01:42,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:42,172 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 23:01:42,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:42,312 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 100 proven. 30 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-03-31 23:01:42,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:42,408 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 82 proven. 30 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-03-31 23:01:42,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978766011] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:42,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [907957943] [2023-03-31 23:01:42,409 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:42,409 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:42,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:42,410 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:42,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:42,418 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:42,486 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:42,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:42,500 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:42,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3689#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:42,843 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:42,843 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:42,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2023-03-31 23:01:42,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828033832] [2023-03-31 23:01:42,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:42,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-03-31 23:01:42,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:42,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-03-31 23:01:42,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 23:01:42,844 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 23 states have internal predecessors, (70), 14 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2023-03-31 23:01:43,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:43,004 INFO L93 Difference]: Finished difference Result 126 states and 142 transitions. [2023-03-31 23:01:43,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-03-31 23:01:43,004 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 23 states have internal predecessors, (70), 14 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 74 [2023-03-31 23:01:43,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:43,005 INFO L225 Difference]: With dead ends: 126 [2023-03-31 23:01:43,005 INFO L226 Difference]: Without dead ends: 89 [2023-03-31 23:01:43,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 190 SyntacticMatches, 11 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 685 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=272, Invalid=1534, Unknown=0, NotChecked=0, Total=1806 [2023-03-31 23:01:43,006 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 34 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:43,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 257 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:43,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-03-31 23:01:43,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 71. [2023-03-31 23:01:43,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 56 states have internal predecessors, (58), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-03-31 23:01:43,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2023-03-31 23:01:43,010 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 74 [2023-03-31 23:01:43,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:43,010 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2023-03-31 23:01:43,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 23 states have internal predecessors, (70), 14 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2023-03-31 23:01:43,010 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2023-03-31 23:01:43,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-03-31 23:01:43,011 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:43,011 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:43,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:43,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:43,217 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:43,217 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:43,217 INFO L85 PathProgramCache]: Analyzing trace with hash -106669647, now seen corresponding path program 8 times [2023-03-31 23:01:43,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:43,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979384260] [2023-03-31 23:01:43,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:43,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:43,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:43,377 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 69 proven. 57 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:43,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:43,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979384260] [2023-03-31 23:01:43,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979384260] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:43,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195742650] [2023-03-31 23:01:43,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:43,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:43,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:43,381 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) [2023-03-31 23:01:43,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-03-31 23:01:43,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-03-31 23:01:43,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:43,427 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 16 conjunts are in the unsatisfiable core [2023-03-31 23:01:43,429 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:43,571 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 84 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:43,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 84 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:43,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195742650] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:43,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279441447] [2023-03-31 23:01:43,706 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:43,706 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:43,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:43,707 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:43,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:43,715 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:43,783 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:43,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:43,798 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:44,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4474#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:44,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:44,140 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:44,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2023-03-31 23:01:44,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210236428] [2023-03-31 23:01:44,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:44,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-03-31 23:01:44,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:44,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-03-31 23:01:44,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1270, Unknown=0, NotChecked=0, Total=1482 [2023-03-31 23:01:44,142 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand has 25 states, 25 states have (on average 2.8) internal successors, (70), 25 states have internal predecessors, (70), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:01:44,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:44,292 INFO L93 Difference]: Finished difference Result 129 states and 147 transitions. [2023-03-31 23:01:44,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-03-31 23:01:44,293 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 25 states have internal predecessors, (70), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 76 [2023-03-31 23:01:44,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:44,293 INFO L225 Difference]: With dead ends: 129 [2023-03-31 23:01:44,293 INFO L226 Difference]: Without dead ends: 94 [2023-03-31 23:01:44,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 193 SyntacticMatches, 13 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=326, Invalid=1744, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 23:01:44,294 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 46 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:44,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 152 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:44,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-03-31 23:01:44,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 73. [2023-03-31 23:01:44,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 58 states have internal predecessors, (60), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-03-31 23:01:44,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2023-03-31 23:01:44,299 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 76 [2023-03-31 23:01:44,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:44,299 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2023-03-31 23:01:44,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 25 states have internal predecessors, (70), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:01:44,299 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2023-03-31 23:01:44,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-03-31 23:01:44,300 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:44,300 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:44,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:44,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-03-31 23:01:44,501 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:44,501 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:44,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1116647882, now seen corresponding path program 9 times [2023-03-31 23:01:44,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:44,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352285059] [2023-03-31 23:01:44,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:44,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:44,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:44,657 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 54 proven. 86 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:44,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:44,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352285059] [2023-03-31 23:01:44,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352285059] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:44,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529000774] [2023-03-31 23:01:44,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:44,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:44,657 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:44,658 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) [2023-03-31 23:01:44,659 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-03-31 23:01:44,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:44,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:44,705 INFO L262 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 20 conjunts are in the unsatisfiable core [2023-03-31 23:01:44,706 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:44,761 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 68 proven. 72 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:44,762 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:44,853 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 68 proven. 72 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-03-31 23:01:44,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529000774] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:44,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [299354505] [2023-03-31 23:01:44,858 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:44,858 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:44,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:44,858 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:44,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:44,874 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:44,947 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:44,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:44,961 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:45,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5271#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:45,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:45,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:45,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 16 [2023-03-31 23:01:45,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534505507] [2023-03-31 23:01:45,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:45,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-03-31 23:01:45,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:45,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-03-31 23:01:45,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2023-03-31 23:01:45,265 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand has 16 states, 16 states have (on average 4.125) internal successors, (66), 14 states have internal predecessors, (66), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-03-31 23:01:45,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:45,318 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2023-03-31 23:01:45,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-03-31 23:01:45,318 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.125) internal successors, (66), 14 states have internal predecessors, (66), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 78 [2023-03-31 23:01:45,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:45,319 INFO L225 Difference]: With dead ends: 92 [2023-03-31 23:01:45,319 INFO L226 Difference]: Without dead ends: 90 [2023-03-31 23:01:45,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 210 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=143, Invalid=787, Unknown=0, NotChecked=0, Total=930 [2023-03-31 23:01:45,320 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 15 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:45,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 115 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:01:45,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-03-31 23:01:45,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2023-03-31 23:01:45,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 67 states have internal predecessors, (69), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:45,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 90 transitions. [2023-03-31 23:01:45,328 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 90 transitions. Word has length 78 [2023-03-31 23:01:45,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:45,328 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 90 transitions. [2023-03-31 23:01:45,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.125) internal successors, (66), 14 states have internal predecessors, (66), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-03-31 23:01:45,329 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 90 transitions. [2023-03-31 23:01:45,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-03-31 23:01:45,330 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:45,330 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:45,343 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:45,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:45,535 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:45,536 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:45,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1034075486, now seen corresponding path program 10 times [2023-03-31 23:01:45,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:45,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967922147] [2023-03-31 23:01:45,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:45,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:45,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:45,777 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 123 proven. 77 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:45,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:45,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967922147] [2023-03-31 23:01:45,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967922147] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:45,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953506097] [2023-03-31 23:01:45,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:01:45,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:45,778 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:45,779 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) [2023-03-31 23:01:45,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-03-31 23:01:45,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:45,834 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 18 conjunts are in the unsatisfiable core [2023-03-31 23:01:45,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:46,019 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 168 proven. 56 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2023-03-31 23:01:46,020 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:46,169 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 142 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-03-31 23:01:46,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953506097] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:46,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492231282] [2023-03-31 23:01:46,171 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:46,171 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:46,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:46,172 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:46,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:46,201 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:46,268 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:46,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:46,283 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:46,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6130#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:46,651 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:46,651 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:46,651 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 29 [2023-03-31 23:01:46,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052917242] [2023-03-31 23:01:46,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:46,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-03-31 23:01:46,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:46,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-03-31 23:01:46,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1546, Unknown=0, NotChecked=0, Total=1806 [2023-03-31 23:01:46,653 INFO L87 Difference]: Start difference. First operand 85 states and 90 transitions. Second operand has 29 states, 29 states have (on average 2.9655172413793105) internal successors, (86), 29 states have internal predecessors, (86), 18 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2023-03-31 23:01:46,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:46,852 INFO L93 Difference]: Finished difference Result 156 states and 177 transitions. [2023-03-31 23:01:46,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-03-31 23:01:46,852 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.9655172413793105) internal successors, (86), 29 states have internal predecessors, (86), 18 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) Word has length 94 [2023-03-31 23:01:46,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:46,853 INFO L225 Difference]: With dead ends: 156 [2023-03-31 23:01:46,853 INFO L226 Difference]: Without dead ends: 111 [2023-03-31 23:01:46,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 244 SyntacticMatches, 15 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=406, Invalid=2144, Unknown=0, NotChecked=0, Total=2550 [2023-03-31 23:01:46,854 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:46,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 228 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:46,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-03-31 23:01:46,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 87. [2023-03-31 23:01:46,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 69 states have internal predecessors, (71), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:46,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2023-03-31 23:01:46,864 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 94 [2023-03-31 23:01:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:46,865 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2023-03-31 23:01:46,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.9655172413793105) internal successors, (86), 29 states have internal predecessors, (86), 18 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2023-03-31 23:01:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2023-03-31 23:01:46,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-03-31 23:01:46,866 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:46,866 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:46,871 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-03-31 23:01:47,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-03-31 23:01:47,071 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:47,071 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:47,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1696561827, now seen corresponding path program 11 times [2023-03-31 23:01:47,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:47,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281713235] [2023-03-31 23:01:47,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:47,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:47,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:47,284 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 123 proven. 93 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:47,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:47,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281713235] [2023-03-31 23:01:47,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281713235] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:47,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157236311] [2023-03-31 23:01:47,284 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:47,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:47,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:47,285 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) [2023-03-31 23:01:47,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-03-31 23:01:47,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-03-31 23:01:47,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:47,338 INFO L262 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 20 conjunts are in the unsatisfiable core [2023-03-31 23:01:47,339 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:47,564 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 144 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:47,564 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:47,735 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 144 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:47,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157236311] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:47,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1100519444] [2023-03-31 23:01:47,736 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:47,737 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:47,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:47,737 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:47,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:47,749 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:47,852 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:47,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:47,866 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:48,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7111#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:48,239 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:48,239 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:48,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2023-03-31 23:01:48,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347294500] [2023-03-31 23:01:48,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:48,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-03-31 23:01:48,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:48,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-03-31 23:01:48,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 23:01:48,241 INFO L87 Difference]: Start difference. First operand 87 states and 92 transitions. Second operand has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:01:48,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:48,430 INFO L93 Difference]: Finished difference Result 159 states and 182 transitions. [2023-03-31 23:01:48,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 23:01:48,430 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 96 [2023-03-31 23:01:48,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:48,431 INFO L225 Difference]: With dead ends: 159 [2023-03-31 23:01:48,431 INFO L226 Difference]: Without dead ends: 116 [2023-03-31 23:01:48,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 247 SyntacticMatches, 17 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=474, Invalid=2388, Unknown=0, NotChecked=0, Total=2862 [2023-03-31 23:01:48,432 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 56 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:48,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 210 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:48,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-03-31 23:01:48,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 89. [2023-03-31 23:01:48,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 70 states have (on average 1.042857142857143) internal successors, (73), 71 states have internal predecessors, (73), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:48,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2023-03-31 23:01:48,436 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 96 [2023-03-31 23:01:48,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:48,436 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2023-03-31 23:01:48,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.774193548387097) internal successors, (86), 31 states have internal predecessors, (86), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:01:48,436 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2023-03-31 23:01:48,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-03-31 23:01:48,437 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:48,437 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:48,445 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:48,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-03-31 23:01:48,645 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:48,645 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:48,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1604191576, now seen corresponding path program 12 times [2023-03-31 23:01:48,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:48,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541292055] [2023-03-31 23:01:48,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:48,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:48,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:48,807 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 88 proven. 146 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:48,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:48,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541292055] [2023-03-31 23:01:48,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541292055] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:48,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569340682] [2023-03-31 23:01:48,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:48,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:48,808 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:48,809 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) [2023-03-31 23:01:48,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-03-31 23:01:48,865 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:48,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:48,866 INFO L262 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 24 conjunts are in the unsatisfiable core [2023-03-31 23:01:48,867 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:48,946 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 106 proven. 128 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:48,947 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 106 proven. 128 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-03-31 23:01:49,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569340682] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:49,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [472087162] [2023-03-31 23:01:49,087 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:49,087 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:49,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:49,087 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:49,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:49,097 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:49,168 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:49,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:49,182 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:49,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8100#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:49,485 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:49,485 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:49,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 18 [2023-03-31 23:01:49,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545951648] [2023-03-31 23:01:49,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:49,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-03-31 23:01:49,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:49,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-03-31 23:01:49,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=833, Unknown=0, NotChecked=0, Total=992 [2023-03-31 23:01:49,487 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 16 states have internal predecessors, (76), 11 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:49,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:49,571 INFO L93 Difference]: Finished difference Result 108 states and 115 transitions. [2023-03-31 23:01:49,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-03-31 23:01:49,572 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 16 states have internal predecessors, (76), 11 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 98 [2023-03-31 23:01:49,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:49,575 INFO L225 Difference]: With dead ends: 108 [2023-03-31 23:01:49,575 INFO L226 Difference]: Without dead ends: 106 [2023-03-31 23:01:49,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 268 SyntacticMatches, 17 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=166, Invalid=890, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 23:01:49,577 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 13 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:49,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 171 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:49,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2023-03-31 23:01:49,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 101. [2023-03-31 23:01:49,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 80 states have internal predecessors, (82), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-03-31 23:01:49,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2023-03-31 23:01:49,585 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 98 [2023-03-31 23:01:49,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:49,585 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2023-03-31 23:01:49,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.222222222222222) internal successors, (76), 16 states have internal predecessors, (76), 11 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-03-31 23:01:49,585 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2023-03-31 23:01:49,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-03-31 23:01:49,586 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:49,586 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:49,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:49,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-03-31 23:01:49,791 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:49,791 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:49,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1298154960, now seen corresponding path program 13 times [2023-03-31 23:01:49,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:49,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821647637] [2023-03-31 23:01:49,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:49,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:49,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:50,049 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 193 proven. 117 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:50,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:50,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821647637] [2023-03-31 23:01:50,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821647637] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:50,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392118678] [2023-03-31 23:01:50,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:01:50,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:50,050 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:50,051 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:50,053 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-03-31 23:01:50,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:50,109 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 22 conjunts are in the unsatisfiable core [2023-03-31 23:01:50,110 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:50,351 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 252 proven. 90 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2023-03-31 23:01:50,352 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:50,562 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 218 proven. 90 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2023-03-31 23:01:50,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392118678] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:50,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1642828305] [2023-03-31 23:01:50,563 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:50,563 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:50,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:50,563 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:50,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:50,571 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:50,642 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:50,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:50,656 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:51,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9131#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:51,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:51,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:51,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2023-03-31 23:01:51,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103720103] [2023-03-31 23:01:51,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:51,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-03-31 23:01:51,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:51,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-03-31 23:01:51,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=2002, Unknown=0, NotChecked=0, Total=2352 [2023-03-31 23:01:51,074 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 22 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) [2023-03-31 23:01:51,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:51,339 INFO L93 Difference]: Finished difference Result 186 states and 212 transitions. [2023-03-31 23:01:51,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-03-31 23:01:51,339 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 22 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) Word has length 114 [2023-03-31 23:01:51,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:51,340 INFO L225 Difference]: With dead ends: 186 [2023-03-31 23:01:51,340 INFO L226 Difference]: Without dead ends: 133 [2023-03-31 23:01:51,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 298 SyntacticMatches, 19 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=572, Invalid=2850, Unknown=0, NotChecked=0, Total=3422 [2023-03-31 23:01:51,341 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 60 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:51,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 255 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:51,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-03-31 23:01:51,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 103. [2023-03-31 23:01:51,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 81 states have (on average 1.037037037037037) internal successors, (84), 82 states have internal predecessors, (84), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-03-31 23:01:51,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2023-03-31 23:01:51,348 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 114 [2023-03-31 23:01:51,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:51,348 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2023-03-31 23:01:51,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 22 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (23), 22 states have call predecessors, (23), 22 states have call successors, (23) [2023-03-31 23:01:51,349 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2023-03-31 23:01:51,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-03-31 23:01:51,349 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:51,349 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:51,356 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-03-31 23:01:51,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-03-31 23:01:51,557 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:51,557 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:51,557 INFO L85 PathProgramCache]: Analyzing trace with hash 827764373, now seen corresponding path program 14 times [2023-03-31 23:01:51,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:51,557 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689468375] [2023-03-31 23:01:51,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:51,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:51,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:51,859 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 193 proven. 137 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:51,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:51,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689468375] [2023-03-31 23:01:51,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689468375] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:51,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144074582] [2023-03-31 23:01:51,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:51,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:51,860 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:51,860 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:51,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-03-31 23:01:51,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-03-31 23:01:51,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:51,925 INFO L262 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 24 conjunts are in the unsatisfiable core [2023-03-31 23:01:51,927 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:52,212 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 220 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:52,213 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:52,423 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 220 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:52,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144074582] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:52,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [575965135] [2023-03-31 23:01:52,424 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:52,424 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:52,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:52,425 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:52,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:52,447 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:52,518 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:52,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:52,532 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:52,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10308#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:52,937 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:52,937 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:52,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2023-03-31 23:01:52,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520387083] [2023-03-31 23:01:52,938 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:52,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-03-31 23:01:52,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:52,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-03-31 23:01:52,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=2162, Unknown=0, NotChecked=0, Total=2550 [2023-03-31 23:01:52,939 INFO L87 Difference]: Start difference. First operand 103 states and 109 transitions. Second operand has 37 states, 37 states have (on average 2.7567567567567566) internal successors, (102), 37 states have internal predecessors, (102), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:01:53,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:53,222 INFO L93 Difference]: Finished difference Result 189 states and 217 transitions. [2023-03-31 23:01:53,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-03-31 23:01:53,222 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.7567567567567566) internal successors, (102), 37 states have internal predecessors, (102), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 116 [2023-03-31 23:01:53,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:53,223 INFO L225 Difference]: With dead ends: 189 [2023-03-31 23:01:53,223 INFO L226 Difference]: Without dead ends: 138 [2023-03-31 23:01:53,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 301 SyntacticMatches, 21 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1492 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=654, Invalid=3128, Unknown=0, NotChecked=0, Total=3782 [2023-03-31 23:01:53,224 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 66 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:53,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 432 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:01:53,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-03-31 23:01:53,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 105. [2023-03-31 23:01:53,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 83 states have (on average 1.036144578313253) internal successors, (86), 84 states have internal predecessors, (86), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-03-31 23:01:53,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 111 transitions. [2023-03-31 23:01:53,230 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 111 transitions. Word has length 116 [2023-03-31 23:01:53,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:53,230 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 111 transitions. [2023-03-31 23:01:53,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.7567567567567566) internal successors, (102), 37 states have internal predecessors, (102), 23 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:01:53,230 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 111 transitions. [2023-03-31 23:01:53,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-03-31 23:01:53,231 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:53,231 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:53,238 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:53,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:53,436 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:53,437 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:53,437 INFO L85 PathProgramCache]: Analyzing trace with hash -246023654, now seen corresponding path program 15 times [2023-03-31 23:01:53,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:53,437 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104388932] [2023-03-31 23:01:53,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:53,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:53,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:53,674 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 130 proven. 222 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:53,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:53,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104388932] [2023-03-31 23:01:53,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104388932] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:53,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067255625] [2023-03-31 23:01:53,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:53,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:53,675 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:53,676 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:53,678 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-03-31 23:01:53,733 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:53,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:53,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 28 conjunts are in the unsatisfiable core [2023-03-31 23:01:53,737 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:53,814 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 152 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:53,814 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:53,987 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 152 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-03-31 23:01:53,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067255625] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:53,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898917000] [2023-03-31 23:01:53,989 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:53,989 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:53,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:53,989 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:53,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:53,999 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:54,066 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:54,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:54,081 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:54,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11489#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:54,394 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:54,394 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:54,394 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 20 [2023-03-31 23:01:54,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631537362] [2023-03-31 23:01:54,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:54,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 23:01:54,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:54,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 23:01:54,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=936, Unknown=0, NotChecked=0, Total=1122 [2023-03-31 23:01:54,395 INFO L87 Difference]: Start difference. First operand 105 states and 111 transitions. Second operand has 20 states, 20 states have (on average 4.3) internal successors, (86), 18 states have internal predecessors, (86), 13 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-03-31 23:01:54,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:54,480 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2023-03-31 23:01:54,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-03-31 23:01:54,481 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.3) internal successors, (86), 18 states have internal predecessors, (86), 13 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 118 [2023-03-31 23:01:54,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:54,482 INFO L225 Difference]: With dead ends: 124 [2023-03-31 23:01:54,482 INFO L226 Difference]: Without dead ends: 122 [2023-03-31 23:01:54,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 326 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=193, Invalid=997, Unknown=0, NotChecked=0, Total=1190 [2023-03-31 23:01:54,482 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:54,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 170 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:54,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-03-31 23:01:54,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 117. [2023-03-31 23:01:54,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 93 states have internal predecessors, (95), 15 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:01:54,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2023-03-31 23:01:54,487 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 118 [2023-03-31 23:01:54,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:54,488 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2023-03-31 23:01:54,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.3) internal successors, (86), 18 states have internal predecessors, (86), 13 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-03-31 23:01:54,488 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2023-03-31 23:01:54,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-03-31 23:01:54,488 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:54,489 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:54,496 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:54,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-03-31 23:01:54,693 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:54,694 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:54,694 INFO L85 PathProgramCache]: Analyzing trace with hash 2015043906, now seen corresponding path program 16 times [2023-03-31 23:01:54,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:54,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080116485] [2023-03-31 23:01:54,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:54,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:54,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 279 proven. 165 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:55,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:55,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080116485] [2023-03-31 23:01:55,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080116485] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:55,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744615624] [2023-03-31 23:01:55,035 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:01:55,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:55,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:55,036 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:55,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-03-31 23:01:55,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:55,094 INFO L262 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 26 conjunts are in the unsatisfiable core [2023-03-31 23:01:55,096 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:55,420 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 352 proven. 132 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2023-03-31 23:01:55,420 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:55,665 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 310 proven. 132 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-03-31 23:01:55,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744615624] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:55,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167308151] [2023-03-31 23:01:55,666 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:55,666 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:55,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:55,667 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:55,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:55,676 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:55,750 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:55,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:55,764 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:56,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12692#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:56,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:56,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:56,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 41 [2023-03-31 23:01:56,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074473244] [2023-03-31 23:01:56,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:56,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-03-31 23:01:56,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:56,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-03-31 23:01:56,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=2514, Unknown=0, NotChecked=0, Total=2970 [2023-03-31 23:01:56,231 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand has 41 states, 41 states have (on average 2.8780487804878048) internal successors, (118), 41 states have internal predecessors, (118), 26 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2023-03-31 23:01:56,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:56,509 INFO L93 Difference]: Finished difference Result 216 states and 247 transitions. [2023-03-31 23:01:56,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-03-31 23:01:56,510 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.8780487804878048) internal successors, (118), 41 states have internal predecessors, (118), 26 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) Word has length 134 [2023-03-31 23:01:56,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:56,511 INFO L225 Difference]: With dead ends: 216 [2023-03-31 23:01:56,511 INFO L226 Difference]: Without dead ends: 155 [2023-03-31 23:01:56,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 352 SyntacticMatches, 23 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1759 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=770, Invalid=3652, Unknown=0, NotChecked=0, Total=4422 [2023-03-31 23:01:56,512 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 76 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:56,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 270 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:56,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2023-03-31 23:01:56,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 119. [2023-03-31 23:01:56,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 95 states have internal predecessors, (97), 15 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:01:56,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 126 transitions. [2023-03-31 23:01:56,517 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 126 transitions. Word has length 134 [2023-03-31 23:01:56,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:56,517 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 126 transitions. [2023-03-31 23:01:56,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.8780487804878048) internal successors, (118), 41 states have internal predecessors, (118), 26 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 26 states have call predecessors, (27), 26 states have call successors, (27) [2023-03-31 23:01:56,518 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 126 transitions. [2023-03-31 23:01:56,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-03-31 23:01:56,518 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:56,518 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:56,523 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:56,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:56,724 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:56,724 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:56,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1702726265, now seen corresponding path program 17 times [2023-03-31 23:01:56,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:56,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301170871] [2023-03-31 23:01:56,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:56,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:56,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:57,094 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 279 proven. 189 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:57,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:57,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301170871] [2023-03-31 23:01:57,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301170871] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:57,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118332321] [2023-03-31 23:01:57,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:01:57,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:57,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:57,095 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:57,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-03-31 23:01:57,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-03-31 23:01:57,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:57,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 28 conjunts are in the unsatisfiable core [2023-03-31 23:01:57,170 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:57,528 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 312 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:57,528 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:57,812 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 312 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:57,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118332321] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:57,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1913402990] [2023-03-31 23:01:57,813 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:57,813 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:57,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:57,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:57,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:57,830 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:57,912 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:57,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:57,926 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:58,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14065#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:58,393 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:58,393 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:58,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2023-03-31 23:01:58,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648253853] [2023-03-31 23:01:58,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:58,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-03-31 23:01:58,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:58,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-03-31 23:01:58,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=2692, Unknown=0, NotChecked=0, Total=3192 [2023-03-31 23:01:58,395 INFO L87 Difference]: Start difference. First operand 119 states and 126 transitions. Second operand has 43 states, 43 states have (on average 2.744186046511628) internal successors, (118), 43 states have internal predecessors, (118), 27 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:01:58,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:01:58,694 INFO L93 Difference]: Finished difference Result 219 states and 252 transitions. [2023-03-31 23:01:58,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-03-31 23:01:58,694 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.744186046511628) internal successors, (118), 43 states have internal predecessors, (118), 27 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Word has length 136 [2023-03-31 23:01:58,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:01:58,695 INFO L225 Difference]: With dead ends: 219 [2023-03-31 23:01:58,695 INFO L226 Difference]: Without dead ends: 160 [2023-03-31 23:01:58,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 355 SyntacticMatches, 25 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1914 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=866, Invalid=3964, Unknown=0, NotChecked=0, Total=4830 [2023-03-31 23:01:58,697 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 82 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:01:58,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 274 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:01:58,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-03-31 23:01:58,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 121. [2023-03-31 23:01:58,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 96 states have (on average 1.03125) internal successors, (99), 97 states have internal predecessors, (99), 15 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:01:58,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 128 transitions. [2023-03-31 23:01:58,702 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 128 transitions. Word has length 136 [2023-03-31 23:01:58,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:01:58,702 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 128 transitions. [2023-03-31 23:01:58,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.744186046511628) internal successors, (118), 43 states have internal predecessors, (118), 27 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:01:58,702 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 128 transitions. [2023-03-31 23:01:58,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-03-31 23:01:58,702 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:01:58,703 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:01:58,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-03-31 23:01:58,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:58,908 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:01:58,908 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:01:58,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1067070324, now seen corresponding path program 18 times [2023-03-31 23:01:58,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:01:58,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723611516] [2023-03-31 23:01:58,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:01:58,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:01:58,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:01:59,175 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 180 proven. 314 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:59,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:01:59,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723611516] [2023-03-31 23:01:59,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723611516] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:01:59,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095700198] [2023-03-31 23:01:59,175 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:01:59,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:01:59,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:01:59,176 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:01:59,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-03-31 23:01:59,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:01:59,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:01:59,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 32 conjunts are in the unsatisfiable core [2023-03-31 23:01:59,244 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:01:59,348 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 206 proven. 288 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:59,348 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:01:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 206 proven. 288 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-03-31 23:01:59,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095700198] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:01:59,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1642408666] [2023-03-31 23:01:59,572 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:01:59,572 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:01:59,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:01:59,572 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:01:59,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:01:59,580 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:01:59,655 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:01:59,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:01:59,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:01:59,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15438#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:01:59,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:01:59,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:01:59,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 22 [2023-03-31 23:01:59,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982661348] [2023-03-31 23:01:59,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:01:59,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-03-31 23:01:59,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:01:59,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-03-31 23:01:59,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1043, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 23:01:59,995 INFO L87 Difference]: Start difference. First operand 121 states and 128 transitions. Second operand has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 20 states have internal predecessors, (96), 15 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:02:00,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:00,087 INFO L93 Difference]: Finished difference Result 140 states and 149 transitions. [2023-03-31 23:02:00,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-03-31 23:02:00,087 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 20 states have internal predecessors, (96), 15 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 138 [2023-03-31 23:02:00,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:00,088 INFO L225 Difference]: With dead ends: 140 [2023-03-31 23:02:00,088 INFO L226 Difference]: Without dead ends: 138 [2023-03-31 23:02:00,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 384 SyntacticMatches, 25 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=224, Invalid=1108, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 23:02:00,089 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 9 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:00,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 244 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:02:00,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-03-31 23:02:00,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2023-03-31 23:02:00,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 105 states have (on average 1.0285714285714285) internal successors, (108), 106 states have internal predecessors, (108), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:02:00,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2023-03-31 23:02:00,094 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 138 [2023-03-31 23:02:00,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:00,094 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2023-03-31 23:02:00,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.363636363636363) internal successors, (96), 20 states have internal predecessors, (96), 15 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:02:00,094 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2023-03-31 23:02:00,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-03-31 23:02:00,095 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:00,095 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:00,102 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:00,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:00,302 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:00,303 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:00,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1930702924, now seen corresponding path program 19 times [2023-03-31 23:02:00,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:00,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184454806] [2023-03-31 23:02:00,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:00,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:00,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:00,738 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 381 proven. 221 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:00,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:00,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184454806] [2023-03-31 23:02:00,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184454806] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:00,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796499724] [2023-03-31 23:02:00,739 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:02:00,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:00,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:00,740 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:00,742 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-03-31 23:02:00,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:00,804 INFO L262 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 30 conjunts are in the unsatisfiable core [2023-03-31 23:02:00,807 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:01,248 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 468 proven. 182 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2023-03-31 23:02:01,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:01,575 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 418 proven. 182 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2023-03-31 23:02:01,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796499724] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:01,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055537596] [2023-03-31 23:02:01,576 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:01,576 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:01,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:01,576 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:01,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:01,588 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:01,659 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:01,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:01,673 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:02,176 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16813#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:02,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:02,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:02,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 47 [2023-03-31 23:02:02,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795136730] [2023-03-31 23:02:02,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:02,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-03-31 23:02:02,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:02,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-03-31 23:02:02,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=3082, Unknown=0, NotChecked=0, Total=3660 [2023-03-31 23:02:02,178 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 30 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) [2023-03-31 23:02:02,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:02,535 INFO L93 Difference]: Finished difference Result 246 states and 282 transitions. [2023-03-31 23:02:02,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-03-31 23:02:02,535 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 30 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) Word has length 154 [2023-03-31 23:02:02,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:02,536 INFO L225 Difference]: With dead ends: 246 [2023-03-31 23:02:02,536 INFO L226 Difference]: Without dead ends: 177 [2023-03-31 23:02:02,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 406 SyntacticMatches, 27 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2213 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1000, Invalid=4550, Unknown=0, NotChecked=0, Total=5550 [2023-03-31 23:02:02,537 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 124 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:02,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 438 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:02,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2023-03-31 23:02:02,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 135. [2023-03-31 23:02:02,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 107 states have (on average 1.02803738317757) internal successors, (110), 108 states have internal predecessors, (110), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:02:02,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 143 transitions. [2023-03-31 23:02:02,543 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 143 transitions. Word has length 154 [2023-03-31 23:02:02,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:02,543 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 143 transitions. [2023-03-31 23:02:02,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.851063829787234) internal successors, (134), 47 states have internal predecessors, (134), 30 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 30 states have call predecessors, (31), 30 states have call successors, (31) [2023-03-31 23:02:02,544 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 143 transitions. [2023-03-31 23:02:02,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-03-31 23:02:02,544 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:02,544 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:02,553 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:02,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:02,750 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:02,750 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:02,750 INFO L85 PathProgramCache]: Analyzing trace with hash 194727801, now seen corresponding path program 20 times [2023-03-31 23:02:02,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:02,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501371361] [2023-03-31 23:02:02,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:02,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:02,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:03,176 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 381 proven. 249 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:03,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:03,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501371361] [2023-03-31 23:02:03,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501371361] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:03,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275100470] [2023-03-31 23:02:03,176 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:02:03,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:03,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:03,177 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:03,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-03-31 23:02:03,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-03-31 23:02:03,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:03,264 INFO L262 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 32 conjunts are in the unsatisfiable core [2023-03-31 23:02:03,266 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:03,690 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:03,691 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:04,037 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:04,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275100470] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:04,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [450773901] [2023-03-31 23:02:04,038 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:04,038 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:04,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:04,039 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:04,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:04,068 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:04,140 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:04,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:04,154 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:04,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18382#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:04,636 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:04,636 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:04,636 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2023-03-31 23:02:04,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308265721] [2023-03-31 23:02:04,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:04,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-03-31 23:02:04,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:04,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-03-31 23:02:04,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=3278, Unknown=0, NotChecked=0, Total=3906 [2023-03-31 23:02:04,638 INFO L87 Difference]: Start difference. First operand 135 states and 143 transitions. Second operand has 49 states, 49 states have (on average 2.7346938775510203) internal successors, (134), 49 states have internal predecessors, (134), 31 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-03-31 23:02:05,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:05,055 INFO L93 Difference]: Finished difference Result 249 states and 287 transitions. [2023-03-31 23:02:05,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-03-31 23:02:05,055 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.7346938775510203) internal successors, (134), 49 states have internal predecessors, (134), 31 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) Word has length 156 [2023-03-31 23:02:05,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:05,056 INFO L225 Difference]: With dead ends: 249 [2023-03-31 23:02:05,056 INFO L226 Difference]: Without dead ends: 182 [2023-03-31 23:02:05,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 409 SyntacticMatches, 29 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2384 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1110, Invalid=4896, Unknown=0, NotChecked=0, Total=6006 [2023-03-31 23:02:05,057 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 92 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:05,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 353 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:05,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-03-31 23:02:05,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 137. [2023-03-31 23:02:05,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 110 states have internal predecessors, (112), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:02:05,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 145 transitions. [2023-03-31 23:02:05,074 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 145 transitions. Word has length 156 [2023-03-31 23:02:05,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:05,074 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 145 transitions. [2023-03-31 23:02:05,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.7346938775510203) internal successors, (134), 49 states have internal predecessors, (134), 31 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2023-03-31 23:02:05,075 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 145 transitions. [2023-03-31 23:02:05,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-03-31 23:02:05,075 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:05,075 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:05,083 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:05,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-03-31 23:02:05,281 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:05,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:05,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1670778370, now seen corresponding path program 21 times [2023-03-31 23:02:05,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:05,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491254330] [2023-03-31 23:02:05,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:05,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:05,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:05,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 238 proven. 422 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:05,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:05,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491254330] [2023-03-31 23:02:05,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491254330] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:05,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916704040] [2023-03-31 23:02:05,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:02:05,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:05,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:05,600 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:05,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-03-31 23:02:05,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:02:05,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:05,675 INFO L262 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 36 conjunts are in the unsatisfiable core [2023-03-31 23:02:05,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:05,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 268 proven. 392 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:05,781 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:06,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 268 proven. 392 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-03-31 23:02:06,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916704040] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:06,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393842655] [2023-03-31 23:02:06,057 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:06,057 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:06,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:06,057 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:06,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:06,064 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:06,139 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:06,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:06,153 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:06,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19947#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:06,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:06,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:06,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 24 [2023-03-31 23:02:06,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652916674] [2023-03-31 23:02:06,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:06,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-03-31 23:02:06,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:06,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-03-31 23:02:06,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2023-03-31 23:02:06,516 INFO L87 Difference]: Start difference. First operand 137 states and 145 transitions. Second operand has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 22 states have internal predecessors, (106), 17 states have call successors, (20), 3 states have call predecessors, (20), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:02:06,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:06,615 INFO L93 Difference]: Finished difference Result 156 states and 166 transitions. [2023-03-31 23:02:06,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-03-31 23:02:06,616 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 22 states have internal predecessors, (106), 17 states have call successors, (20), 3 states have call predecessors, (20), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 158 [2023-03-31 23:02:06,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:06,616 INFO L225 Difference]: With dead ends: 156 [2023-03-31 23:02:06,616 INFO L226 Difference]: Without dead ends: 154 [2023-03-31 23:02:06,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 442 SyntacticMatches, 29 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=259, Invalid=1223, Unknown=0, NotChecked=0, Total=1482 [2023-03-31 23:02:06,617 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 10 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:06,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 264 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:02:06,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2023-03-31 23:02:06,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 149. [2023-03-31 23:02:06,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 119 states have internal predecessors, (121), 19 states have call successors, (19), 12 states have call predecessors, (19), 11 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:02:06,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 158 transitions. [2023-03-31 23:02:06,623 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 158 transitions. Word has length 158 [2023-03-31 23:02:06,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:06,623 INFO L495 AbstractCegarLoop]: Abstraction has 149 states and 158 transitions. [2023-03-31 23:02:06,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.416666666666667) internal successors, (106), 22 states have internal predecessors, (106), 17 states have call successors, (20), 3 states have call predecessors, (20), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:02:06,623 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 158 transitions. [2023-03-31 23:02:06,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2023-03-31 23:02:06,624 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:06,624 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:06,630 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-03-31 23:02:06,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-03-31 23:02:06,832 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:06,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:06,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1504366886, now seen corresponding path program 22 times [2023-03-31 23:02:06,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:06,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454753724] [2023-03-31 23:02:06,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:06,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:07,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1264 backedges. 499 proven. 285 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:07,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:07,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454753724] [2023-03-31 23:02:07,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454753724] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:07,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498191347] [2023-03-31 23:02:07,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:02:07,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:07,360 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:07,361 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:07,362 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-03-31 23:02:07,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:07,441 INFO L262 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 34 conjunts are in the unsatisfiable core [2023-03-31 23:02:07,443 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:07,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1264 backedges. 600 proven. 240 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2023-03-31 23:02:07,954 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:08,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1264 backedges. 542 proven. 240 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2023-03-31 23:02:08,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498191347] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:08,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1753761793] [2023-03-31 23:02:08,346 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:08,346 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:08,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:08,346 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:08,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:08,354 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:08,430 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:08,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:08,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:08,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21494#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:08,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:08,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:08,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 53 [2023-03-31 23:02:08,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204664495] [2023-03-31 23:02:08,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:08,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-03-31 23:02:08,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:08,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-03-31 23:02:08,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=716, Invalid=3706, Unknown=0, NotChecked=0, Total=4422 [2023-03-31 23:02:08,985 INFO L87 Difference]: Start difference. First operand 149 states and 158 transitions. Second operand has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 53 states have internal predecessors, (150), 34 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 34 states have call predecessors, (35), 34 states have call successors, (35) [2023-03-31 23:02:09,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:09,380 INFO L93 Difference]: Finished difference Result 276 states and 317 transitions. [2023-03-31 23:02:09,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-03-31 23:02:09,380 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 53 states have internal predecessors, (150), 34 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 34 states have call predecessors, (35), 34 states have call successors, (35) Word has length 174 [2023-03-31 23:02:09,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:09,381 INFO L225 Difference]: With dead ends: 276 [2023-03-31 23:02:09,381 INFO L226 Difference]: Without dead ends: 199 [2023-03-31 23:02:09,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 460 SyntacticMatches, 31 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1262, Invalid=5544, Unknown=0, NotChecked=0, Total=6806 [2023-03-31 23:02:09,382 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 130 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:09,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 382 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:09,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2023-03-31 23:02:09,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 151. [2023-03-31 23:02:09,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 120 states have (on average 1.025) internal successors, (123), 121 states have internal predecessors, (123), 19 states have call successors, (19), 12 states have call predecessors, (19), 11 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:02:09,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 160 transitions. [2023-03-31 23:02:09,389 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 160 transitions. Word has length 174 [2023-03-31 23:02:09,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:09,389 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 160 transitions. [2023-03-31 23:02:09,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.830188679245283) internal successors, (150), 53 states have internal predecessors, (150), 34 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 34 states have call predecessors, (35), 34 states have call successors, (35) [2023-03-31 23:02:09,389 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 160 transitions. [2023-03-31 23:02:09,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2023-03-31 23:02:09,390 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:09,390 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:09,401 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:09,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:09,590 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:09,591 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:09,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1046068331, now seen corresponding path program 23 times [2023-03-31 23:02:09,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:09,591 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604655010] [2023-03-31 23:02:09,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:09,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:09,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:10,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 499 proven. 317 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:10,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:10,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604655010] [2023-03-31 23:02:10,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604655010] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:10,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305329835] [2023-03-31 23:02:10,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:02:10,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:10,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:10,164 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:10,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-03-31 23:02:10,253 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-03-31 23:02:10,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:10,256 INFO L262 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 36 conjunts are in the unsatisfiable core [2023-03-31 23:02:10,258 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:10,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 544 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:10,879 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:11,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 544 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:11,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305329835] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:11,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568127387] [2023-03-31 23:02:11,288 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:11,288 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:11,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:11,288 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:11,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:11,297 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:11,385 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:11,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:11,400 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:11,927 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23259#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:11,927 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:11,927 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:11,928 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2023-03-31 23:02:11,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385946836] [2023-03-31 23:02:11,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:11,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-03-31 23:02:11,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:11,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-03-31 23:02:11,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=772, Invalid=3920, Unknown=0, NotChecked=0, Total=4692 [2023-03-31 23:02:11,930 INFO L87 Difference]: Start difference. First operand 151 states and 160 transitions. Second operand has 55 states, 55 states have (on average 2.727272727272727) internal successors, (150), 55 states have internal predecessors, (150), 35 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-03-31 23:02:12,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:12,383 INFO L93 Difference]: Finished difference Result 279 states and 322 transitions. [2023-03-31 23:02:12,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-03-31 23:02:12,384 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.727272727272727) internal successors, (150), 55 states have internal predecessors, (150), 35 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) Word has length 176 [2023-03-31 23:02:12,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:12,385 INFO L225 Difference]: With dead ends: 279 [2023-03-31 23:02:12,385 INFO L226 Difference]: Without dead ends: 204 [2023-03-31 23:02:12,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 463 SyntacticMatches, 33 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1386, Invalid=5924, Unknown=0, NotChecked=0, Total=7310 [2023-03-31 23:02:12,386 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 92 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:12,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 466 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:12,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2023-03-31 23:02:12,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 153. [2023-03-31 23:02:12,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 123 states have internal predecessors, (125), 19 states have call successors, (19), 12 states have call predecessors, (19), 11 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:02:12,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 162 transitions. [2023-03-31 23:02:12,392 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 162 transitions. Word has length 176 [2023-03-31 23:02:12,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:12,395 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 162 transitions. [2023-03-31 23:02:12,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.727272727272727) internal successors, (150), 55 states have internal predecessors, (150), 35 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-03-31 23:02:12,395 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 162 transitions. [2023-03-31 23:02:12,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2023-03-31 23:02:12,396 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:12,396 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:12,403 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:12,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:12,597 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:12,597 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:12,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1292178832, now seen corresponding path program 24 times [2023-03-31 23:02:12,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:12,597 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329117275] [2023-03-31 23:02:12,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:12,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:12,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:13,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 304 proven. 546 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:13,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:13,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329117275] [2023-03-31 23:02:13,013 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329117275] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:13,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654637191] [2023-03-31 23:02:13,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:02:13,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:13,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:13,014 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:13,016 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-03-31 23:02:13,087 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:02:13,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:13,089 INFO L262 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 40 conjunts are in the unsatisfiable core [2023-03-31 23:02:13,091 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:13,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 338 proven. 512 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:13,206 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:13,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 338 proven. 512 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-03-31 23:02:13,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654637191] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:13,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672542369] [2023-03-31 23:02:13,513 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:13,513 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:13,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:13,514 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:13,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:13,524 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:13,599 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:13,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:13,618 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:13,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25016#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:13,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:13,960 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:13,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 26 [2023-03-31 23:02:13,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743040514] [2023-03-31 23:02:13,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:13,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-03-31 23:02:13,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:13,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-03-31 23:02:13,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2023-03-31 23:02:13,961 INFO L87 Difference]: Start difference. First operand 153 states and 162 transitions. Second operand has 26 states, 26 states have (on average 4.461538461538462) internal successors, (116), 24 states have internal predecessors, (116), 19 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:02:14,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:14,096 INFO L93 Difference]: Finished difference Result 172 states and 183 transitions. [2023-03-31 23:02:14,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-03-31 23:02:14,097 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.461538461538462) internal successors, (116), 24 states have internal predecessors, (116), 19 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 178 [2023-03-31 23:02:14,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:14,098 INFO L225 Difference]: With dead ends: 172 [2023-03-31 23:02:14,098 INFO L226 Difference]: Without dead ends: 170 [2023-03-31 23:02:14,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 500 SyntacticMatches, 33 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 896 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=298, Invalid=1342, Unknown=0, NotChecked=0, Total=1640 [2023-03-31 23:02:14,099 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 11 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:14,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 279 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:02:14,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2023-03-31 23:02:14,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 165. [2023-03-31 23:02:14,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 132 states have internal predecessors, (134), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2023-03-31 23:02:14,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 175 transitions. [2023-03-31 23:02:14,111 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 175 transitions. Word has length 178 [2023-03-31 23:02:14,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:14,112 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 175 transitions. [2023-03-31 23:02:14,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.461538461538462) internal successors, (116), 24 states have internal predecessors, (116), 19 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-03-31 23:02:14,112 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 175 transitions. [2023-03-31 23:02:14,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2023-03-31 23:02:14,113 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:14,113 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 18, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:14,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:14,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-03-31 23:02:14,319 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:14,320 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:14,320 INFO L85 PathProgramCache]: Analyzing trace with hash -890198632, now seen corresponding path program 25 times [2023-03-31 23:02:14,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:14,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100906867] [2023-03-31 23:02:14,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:14,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:14,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:14,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1602 backedges. 633 proven. 357 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:14,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:14,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100906867] [2023-03-31 23:02:14,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100906867] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:14,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943074611] [2023-03-31 23:02:14,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:02:14,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:14,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:14,974 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:14,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-03-31 23:02:15,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:15,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 38 conjunts are in the unsatisfiable core [2023-03-31 23:02:15,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:15,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1602 backedges. 748 proven. 306 refuted. 0 times theorem prover too weak. 548 trivial. 0 not checked. [2023-03-31 23:02:15,649 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:16,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1602 backedges. 682 proven. 306 refuted. 0 times theorem prover too weak. 614 trivial. 0 not checked. [2023-03-31 23:02:16,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943074611] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:16,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1986426319] [2023-03-31 23:02:16,111 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:16,111 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:16,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:16,111 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:16,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:16,118 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:16,179 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:16,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:16,194 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:16,756 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26735#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:16,756 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:16,756 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:16,756 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2023-03-31 23:02:16,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431169592] [2023-03-31 23:02:16,757 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:16,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-03-31 23:02:16,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:16,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-03-31 23:02:16,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=870, Invalid=4386, Unknown=0, NotChecked=0, Total=5256 [2023-03-31 23:02:16,758 INFO L87 Difference]: Start difference. First operand 165 states and 175 transitions. Second operand has 59 states, 59 states have (on average 2.8135593220338984) internal successors, (166), 59 states have internal predecessors, (166), 38 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 38 states have call predecessors, (39), 38 states have call successors, (39) [2023-03-31 23:02:17,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:17,279 INFO L93 Difference]: Finished difference Result 306 states and 352 transitions. [2023-03-31 23:02:17,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-03-31 23:02:17,279 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.8135593220338984) internal successors, (166), 59 states have internal predecessors, (166), 38 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 38 states have call predecessors, (39), 38 states have call successors, (39) Word has length 194 [2023-03-31 23:02:17,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:17,280 INFO L225 Difference]: With dead ends: 306 [2023-03-31 23:02:17,280 INFO L226 Difference]: Without dead ends: 221 [2023-03-31 23:02:17,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 514 SyntacticMatches, 35 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3265 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1556, Invalid=6634, Unknown=0, NotChecked=0, Total=8190 [2023-03-31 23:02:17,281 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 108 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:17,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 602 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:17,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2023-03-31 23:02:17,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 167. [2023-03-31 23:02:17,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 133 states have (on average 1.0225563909774436) internal successors, (136), 134 states have internal predecessors, (136), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2023-03-31 23:02:17,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 177 transitions. [2023-03-31 23:02:17,288 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 177 transitions. Word has length 194 [2023-03-31 23:02:17,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:17,288 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 177 transitions. [2023-03-31 23:02:17,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.8135593220338984) internal successors, (166), 59 states have internal predecessors, (166), 38 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 38 states have call predecessors, (39), 38 states have call successors, (39) [2023-03-31 23:02:17,288 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 177 transitions. [2023-03-31 23:02:17,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2023-03-31 23:02:17,289 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:17,289 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:17,304 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:17,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-03-31 23:02:17,494 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:17,494 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:17,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1530281053, now seen corresponding path program 26 times [2023-03-31 23:02:17,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:17,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137836809] [2023-03-31 23:02:17,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:17,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:17,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:18,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 633 proven. 393 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:18,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:18,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137836809] [2023-03-31 23:02:18,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137836809] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:18,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440630199] [2023-03-31 23:02:18,155 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:02:18,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:18,155 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:18,156 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:18,157 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-03-31 23:02:18,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2023-03-31 23:02:18,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:18,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 40 conjunts are in the unsatisfiable core [2023-03-31 23:02:18,246 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:18,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 684 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:18,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:19,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 684 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:19,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440630199] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:19,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550060365] [2023-03-31 23:02:19,358 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:19,358 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:19,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:19,358 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:19,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:19,369 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:19,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:19,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:19,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:20,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28696#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:20,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:20,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:20,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2023-03-31 23:02:20,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230320399] [2023-03-31 23:02:20,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:20,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-03-31 23:02:20,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:20,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-03-31 23:02:20,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=932, Invalid=4618, Unknown=0, NotChecked=0, Total=5550 [2023-03-31 23:02:20,026 INFO L87 Difference]: Start difference. First operand 167 states and 177 transitions. Second operand has 61 states, 61 states have (on average 2.721311475409836) internal successors, (166), 61 states have internal predecessors, (166), 39 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-03-31 23:02:20,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:20,538 INFO L93 Difference]: Finished difference Result 309 states and 357 transitions. [2023-03-31 23:02:20,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-03-31 23:02:20,538 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.721311475409836) internal successors, (166), 61 states have internal predecessors, (166), 39 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) Word has length 196 [2023-03-31 23:02:20,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:20,539 INFO L225 Difference]: With dead ends: 309 [2023-03-31 23:02:20,539 INFO L226 Difference]: Without dead ends: 226 [2023-03-31 23:02:20,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 517 SyntacticMatches, 37 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3468 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1694, Invalid=7048, Unknown=0, NotChecked=0, Total=8742 [2023-03-31 23:02:20,540 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 152 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:20,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 340 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:20,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2023-03-31 23:02:20,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 169. [2023-03-31 23:02:20,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 136 states have internal predecessors, (138), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2023-03-31 23:02:20,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 179 transitions. [2023-03-31 23:02:20,547 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 179 transitions. Word has length 196 [2023-03-31 23:02:20,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:20,547 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 179 transitions. [2023-03-31 23:02:20,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.721311475409836) internal successors, (166), 61 states have internal predecessors, (166), 39 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2023-03-31 23:02:20,548 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 179 transitions. [2023-03-31 23:02:20,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-03-31 23:02:20,548 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:20,548 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:20,566 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:20,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-03-31 23:02:20,755 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:20,755 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:20,755 INFO L85 PathProgramCache]: Analyzing trace with hash -261016094, now seen corresponding path program 27 times [2023-03-31 23:02:20,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:20,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292837203] [2023-03-31 23:02:20,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:20,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:20,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:21,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1676 backedges. 378 proven. 686 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:21,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:21,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292837203] [2023-03-31 23:02:21,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292837203] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:21,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837320350] [2023-03-31 23:02:21,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:02:21,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:21,210 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:21,213 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:21,232 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-03-31 23:02:21,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:02:21,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:21,306 INFO L262 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 44 conjunts are in the unsatisfiable core [2023-03-31 23:02:21,311 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1676 backedges. 416 proven. 648 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:21,461 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:21,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1676 backedges. 416 proven. 648 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-03-31 23:02:21,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837320350] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:21,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1717836270] [2023-03-31 23:02:21,862 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:21,862 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:21,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:21,863 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:21,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:21,869 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:21,931 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:21,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:21,945 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:22,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30645#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:22,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:22,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:22,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 28 [2023-03-31 23:02:22,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234650954] [2023-03-31 23:02:22,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:22,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-03-31 23:02:22,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:22,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-03-31 23:02:22,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1388, Unknown=0, NotChecked=0, Total=1722 [2023-03-31 23:02:22,315 INFO L87 Difference]: Start difference. First operand 169 states and 179 transitions. Second operand has 28 states, 28 states have (on average 4.5) internal successors, (126), 26 states have internal predecessors, (126), 21 states have call successors, (24), 3 states have call predecessors, (24), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-03-31 23:02:22,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:22,460 INFO L93 Difference]: Finished difference Result 188 states and 200 transitions. [2023-03-31 23:02:22,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-03-31 23:02:22,460 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 4.5) internal successors, (126), 26 states have internal predecessors, (126), 21 states have call successors, (24), 3 states have call predecessors, (24), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 198 [2023-03-31 23:02:22,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:22,461 INFO L225 Difference]: With dead ends: 188 [2023-03-31 23:02:22,461 INFO L226 Difference]: Without dead ends: 186 [2023-03-31 23:02:22,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 558 SyntacticMatches, 37 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1026 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=341, Invalid=1465, Unknown=0, NotChecked=0, Total=1806 [2023-03-31 23:02:22,462 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 10 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:22,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 297 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:02:22,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2023-03-31 23:02:22,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 181. [2023-03-31 23:02:22,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 145 states have internal predecessors, (147), 23 states have call successors, (23), 14 states have call predecessors, (23), 13 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:02:22,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 192 transitions. [2023-03-31 23:02:22,470 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 192 transitions. Word has length 198 [2023-03-31 23:02:22,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:22,471 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 192 transitions. [2023-03-31 23:02:22,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 4.5) internal successors, (126), 26 states have internal predecessors, (126), 21 states have call successors, (24), 3 states have call predecessors, (24), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-03-31 23:02:22,471 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 192 transitions. [2023-03-31 23:02:22,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2023-03-31 23:02:22,472 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:22,472 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 20, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:22,482 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:22,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:22,676 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:22,677 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:22,677 INFO L85 PathProgramCache]: Analyzing trace with hash 202755338, now seen corresponding path program 28 times [2023-03-31 23:02:22,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:22,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262049965] [2023-03-31 23:02:22,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:22,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:22,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:23,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 783 proven. 437 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:23,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:23,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262049965] [2023-03-31 23:02:23,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262049965] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:23,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038331260] [2023-03-31 23:02:23,425 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:02:23,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:23,425 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:23,426 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:23,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-03-31 23:02:23,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:23,510 INFO L262 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 42 conjunts are in the unsatisfiable core [2023-03-31 23:02:23,513 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:24,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 912 proven. 380 refuted. 0 times theorem prover too weak. 688 trivial. 0 not checked. [2023-03-31 23:02:24,212 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:24,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 838 proven. 380 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2023-03-31 23:02:24,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1038331260] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:24,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815427744] [2023-03-31 23:02:24,778 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:24,778 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:24,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:24,779 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:24,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:24,789 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:24,856 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:24,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:24,870 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:25,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32536#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:25,455 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:25,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:25,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2023-03-31 23:02:25,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205589381] [2023-03-31 23:02:25,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:25,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-03-31 23:02:25,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:25,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-03-31 23:02:25,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=5122, Unknown=0, NotChecked=0, Total=6162 [2023-03-31 23:02:25,457 INFO L87 Difference]: Start difference. First operand 181 states and 192 transitions. Second operand has 65 states, 65 states have (on average 2.8) internal successors, (182), 65 states have internal predecessors, (182), 42 states have call successors, (44), 2 states have call predecessors, (44), 2 states have return successors, (43), 42 states have call predecessors, (43), 42 states have call successors, (43) [2023-03-31 23:02:26,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:26,019 INFO L93 Difference]: Finished difference Result 336 states and 387 transitions. [2023-03-31 23:02:26,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-03-31 23:02:26,020 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.8) internal successors, (182), 65 states have internal predecessors, (182), 42 states have call successors, (44), 2 states have call predecessors, (44), 2 states have return successors, (43), 42 states have call predecessors, (43), 42 states have call successors, (43) Word has length 214 [2023-03-31 23:02:26,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:26,021 INFO L225 Difference]: With dead ends: 336 [2023-03-31 23:02:26,021 INFO L226 Difference]: Without dead ends: 243 [2023-03-31 23:02:26,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 704 GetRequests, 568 SyntacticMatches, 39 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3863 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1882, Invalid=7820, Unknown=0, NotChecked=0, Total=9702 [2023-03-31 23:02:26,022 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 136 mSDsluCounter, 564 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:26,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 632 Invalid, 708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:02:26,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2023-03-31 23:02:26,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 183. [2023-03-31 23:02:26,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 147 states have internal predecessors, (149), 23 states have call successors, (23), 14 states have call predecessors, (23), 13 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:02:26,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 194 transitions. [2023-03-31 23:02:26,030 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 194 transitions. Word has length 214 [2023-03-31 23:02:26,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:26,030 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 194 transitions. [2023-03-31 23:02:26,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.8) internal successors, (182), 65 states have internal predecessors, (182), 42 states have call successors, (44), 2 states have call predecessors, (44), 2 states have return successors, (43), 42 states have call predecessors, (43), 42 states have call successors, (43) [2023-03-31 23:02:26,030 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 194 transitions. [2023-03-31 23:02:26,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2023-03-31 23:02:26,031 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:26,031 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:26,039 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:26,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:26,237 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:26,237 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:26,237 INFO L85 PathProgramCache]: Analyzing trace with hash 426331983, now seen corresponding path program 29 times [2023-03-31 23:02:26,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:26,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837979708] [2023-03-31 23:02:26,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:26,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:26,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:27,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 783 proven. 477 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:27,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:27,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837979708] [2023-03-31 23:02:27,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837979708] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:27,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141125353] [2023-03-31 23:02:27,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:02:27,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:27,032 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:27,033 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:27,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-03-31 23:02:27,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2023-03-31 23:02:27,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:27,156 INFO L262 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 44 conjunts are in the unsatisfiable core [2023-03-31 23:02:27,159 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:27,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 840 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:27,868 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:28,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 840 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:28,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141125353] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:28,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071001333] [2023-03-31 23:02:28,441 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:28,441 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:28,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:28,441 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:28,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:28,447 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:28,509 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:28,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:28,524 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:29,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34693#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:29,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:29,139 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:29,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2023-03-31 23:02:29,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599041476] [2023-03-31 23:02:29,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:29,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2023-03-31 23:02:29,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:29,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2023-03-31 23:02:29,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1108, Invalid=5372, Unknown=0, NotChecked=0, Total=6480 [2023-03-31 23:02:29,141 INFO L87 Difference]: Start difference. First operand 183 states and 194 transitions. Second operand has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 43 states have call successors, (44), 2 states have call predecessors, (44), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-03-31 23:02:29,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:29,767 INFO L93 Difference]: Finished difference Result 339 states and 392 transitions. [2023-03-31 23:02:29,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-03-31 23:02:29,767 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 43 states have call successors, (44), 2 states have call predecessors, (44), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) Word has length 216 [2023-03-31 23:02:29,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:29,768 INFO L225 Difference]: With dead ends: 339 [2023-03-31 23:02:29,768 INFO L226 Difference]: Without dead ends: 248 [2023-03-31 23:02:29,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 571 SyntacticMatches, 41 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4082 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2034, Invalid=8268, Unknown=0, NotChecked=0, Total=10302 [2023-03-31 23:02:29,769 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 136 mSDsluCounter, 510 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 581 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:29,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 581 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 23:02:29,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2023-03-31 23:02:29,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 185. [2023-03-31 23:02:29,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 149 states have internal predecessors, (151), 23 states have call successors, (23), 14 states have call predecessors, (23), 13 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:02:29,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 196 transitions. [2023-03-31 23:02:29,777 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 196 transitions. Word has length 216 [2023-03-31 23:02:29,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:29,777 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 196 transitions. [2023-03-31 23:02:29,777 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.716417910447761) internal successors, (182), 67 states have internal predecessors, (182), 43 states have call successors, (44), 2 states have call predecessors, (44), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-03-31 23:02:29,777 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 196 transitions. [2023-03-31 23:02:29,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2023-03-31 23:02:29,778 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:29,778 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:29,783 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:29,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:29,984 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:29,984 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:29,984 INFO L85 PathProgramCache]: Analyzing trace with hash 535123028, now seen corresponding path program 30 times [2023-03-31 23:02:29,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:29,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400655798] [2023-03-31 23:02:29,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:29,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:30,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:02:30,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2062 backedges. 460 proven. 842 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:30,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:02:30,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400655798] [2023-03-31 23:02:30,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400655798] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:02:30,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101563885] [2023-03-31 23:02:30,510 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:02:30,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:02:30,510 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:02:30,511 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:02:30,511 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-03-31 23:02:30,593 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:02:30,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:02:30,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 48 conjunts are in the unsatisfiable core [2023-03-31 23:02:30,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:02:30,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2062 backedges. 502 proven. 800 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:30,732 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:02:31,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2062 backedges. 502 proven. 800 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-03-31 23:02:31,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101563885] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:02:31,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147010243] [2023-03-31 23:02:31,156 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:02:31,156 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:02:31,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:02:31,157 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:02:31,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:02:31,163 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:02:31,238 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-03-31 23:02:31,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:02:31,252 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:02:31,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36834#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:02:31,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:02:31,635 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:02:31,635 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 30 [2023-03-31 23:02:31,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784346889] [2023-03-31 23:02:31,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:02:31,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-03-31 23:02:31,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:02:31,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-03-31 23:02:31,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1511, Unknown=0, NotChecked=0, Total=1892 [2023-03-31 23:02:31,637 INFO L87 Difference]: Start difference. First operand 185 states and 196 transitions. Second operand has 30 states, 30 states have (on average 4.533333333333333) internal successors, (136), 28 states have internal predecessors, (136), 23 states have call successors, (26), 3 states have call predecessors, (26), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:02:31,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:02:31,772 INFO L93 Difference]: Finished difference Result 204 states and 217 transitions. [2023-03-31 23:02:31,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-03-31 23:02:31,772 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 4.533333333333333) internal successors, (136), 28 states have internal predecessors, (136), 23 states have call successors, (26), 3 states have call predecessors, (26), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 218 [2023-03-31 23:02:31,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:02:31,773 INFO L225 Difference]: With dead ends: 204 [2023-03-31 23:02:31,773 INFO L226 Difference]: Without dead ends: 202 [2023-03-31 23:02:31,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 616 SyntacticMatches, 41 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=388, Invalid=1592, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 23:02:31,774 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 12 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:02:31,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 317 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:02:31,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-03-31 23:02:31,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 197. [2023-03-31 23:02:31,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 157 states have (on average 1.019108280254777) internal successors, (160), 158 states have internal predecessors, (160), 25 states have call successors, (25), 15 states have call predecessors, (25), 14 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-03-31 23:02:31,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 209 transitions. [2023-03-31 23:02:31,785 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 209 transitions. Word has length 218 [2023-03-31 23:02:31,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:02:31,786 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 209 transitions. [2023-03-31 23:02:31,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 4.533333333333333) internal successors, (136), 28 states have internal predecessors, (136), 23 states have call successors, (26), 3 states have call predecessors, (26), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-03-31 23:02:31,786 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 209 transitions. [2023-03-31 23:02:31,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2023-03-31 23:02:31,787 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:02:31,787 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:02:31,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2023-03-31 23:02:31,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-03-31 23:02:31,992 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:02:31,992 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:02:31,992 INFO L85 PathProgramCache]: Analyzing trace with hash -1489844356, now seen corresponding path program 31 times [2023-03-31 23:02:31,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:02:31,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456324882] [2023-03-31 23:02:31,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:02:31,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:02:32,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat