/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-examples/standard_two_index_05.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 02:42:30,058 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 02:42:30,059 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 02:42:30,089 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-04-01 02:42:30,127 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 02:42:30,127 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 02:42:30,128 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 02:42:30,129 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 02:42:30,150 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 02:42:30,150 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 02:42:30,151 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 02:42:30,151 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 02:42:30,152 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 02:42:30,152 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 02:42:30,152 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 02:42:30,152 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 02:42:30,152 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 02:42:30,152 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 02:42:30,153 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 02:42:30,153 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 02:42:30,154 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 02:42:30,154 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 02:42:30,155 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:42:30,155 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 02:42:30,155 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 02:42:30,156 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 02:42:30,325 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 02:42:30,344 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 02:42:30,345 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 02:42:30,346 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 02:42:30,347 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 02:42:30,348 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_05.i [2023-04-01 02:42:31,291 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 02:42:31,462 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 02:42:31,463 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_05.i [2023-04-01 02:42:31,467 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb6b5d36e/87924df21d6b4cefb70f34b15c547a8a/FLAGad6e9ae0b [2023-04-01 02:42:31,884 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eb6b5d36e/87924df21d6b4cefb70f34b15c547a8a [2023-04-01 02:42:31,886 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 02:42:31,886 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 02:42:31,887 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 02:42:31,887 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 02:42:31,895 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 02:42:31,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:42:31" (1/1) ... [2023-04-01 02:42:31,897 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72bba80d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:31, skipping insertion in model container [2023-04-01 02:42:31,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:42:31" (1/1) ... [2023-04-01 02:42:31,901 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 02:42:31,917 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 02:42:32,026 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2023-04-01 02:42:32,039 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:42:32,046 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 02:42:32,055 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2023-04-01 02:42:32,064 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:42:32,077 INFO L208 MainTranslator]: Completed translation [2023-04-01 02:42:32,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32 WrapperNode [2023-04-01 02:42:32,077 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 02:42:32,078 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 02:42:32,078 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 02:42:32,078 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 02:42:32,087 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,087 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,092 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,093 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,106 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,110 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,111 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 02:42:32,113 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 02:42:32,113 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 02:42:32,113 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 02:42:32,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (1/1) ... [2023-04-01 02:42:32,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:42:32,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:32,141 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 02:42:32,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 02:42:32,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 02:42:32,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 02:42:32,164 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 02:42:32,165 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 02:42:32,165 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 02:42:32,165 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 02:42:32,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 02:42:32,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 02:42:32,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 02:42:32,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 02:42:32,214 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 02:42:32,216 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 02:42:32,320 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 02:42:32,342 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 02:42:32,342 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-01 02:42:32,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:42:32 BoogieIcfgContainer [2023-04-01 02:42:32,344 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 02:42:32,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 02:42:32,346 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 02:42:32,348 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 02:42:32,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 02:42:31" (1/3) ... [2023-04-01 02:42:32,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@758aebc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:42:32, skipping insertion in model container [2023-04-01 02:42:32,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:42:32" (2/3) ... [2023-04-01 02:42:32,349 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@758aebc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:42:32, skipping insertion in model container [2023-04-01 02:42:32,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:42:32" (3/3) ... [2023-04-01 02:42:32,349 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_05.i [2023-04-01 02:42:32,366 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 02:42:32,366 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 02:42:32,413 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 02:42:32,419 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;@2c962539, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 02:42:32,419 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 02:42:32,426 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 02:42:32,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 02:42:32,431 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:32,431 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:32,431 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:32,435 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:32,435 INFO L85 PathProgramCache]: Analyzing trace with hash -1378143297, now seen corresponding path program 1 times [2023-04-01 02:42:32,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:32,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392933453] [2023-04-01 02:42:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:32,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:32,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:32,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:42:32,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:32,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392933453] [2023-04-01 02:42:32,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392933453] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:42:32,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 02:42:32,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 02:42:32,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249227645] [2023-04-01 02:42:32,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:42:32,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 02:42:32,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:32,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 02:42:32,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:42:32,625 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:32,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:32,658 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2023-04-01 02:42:32,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 02:42:32,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2023-04-01 02:42:32,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:32,667 INFO L225 Difference]: With dead ends: 33 [2023-04-01 02:42:32,667 INFO L226 Difference]: Without dead ends: 17 [2023-04-01 02:42:32,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:42:32,671 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:32,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:42:32,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-01 02:42:32,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-01 02:42:32,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:32,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-04-01 02:42:32,693 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2023-04-01 02:42:32,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:32,694 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-04-01 02:42:32,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:32,694 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-04-01 02:42:32,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 02:42:32,694 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:32,695 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:32,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 02:42:32,695 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:32,695 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:32,696 INFO L85 PathProgramCache]: Analyzing trace with hash -314190673, now seen corresponding path program 1 times [2023-04-01 02:42:32,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:32,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800413811] [2023-04-01 02:42:32,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:32,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:32,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:32,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:42:32,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:32,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800413811] [2023-04-01 02:42:32,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800413811] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:32,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904932864] [2023-04-01 02:42:32,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:32,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:32,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:32,796 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:32,816 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 02:42:32,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:32,871 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 2 conjunts are in the unsatisfiable core [2023-04-01 02:42:32,874 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:32,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:42:32,885 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 02:42:32,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904932864] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:42:32,886 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 02:42:32,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-04-01 02:42:32,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873758972] [2023-04-01 02:42:32,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:42:32,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 02:42:32,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:32,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 02:42:32,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 02:42:32,888 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:32,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:32,905 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2023-04-01 02:42:32,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 02:42:32,906 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-01 02:42:32,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:32,907 INFO L225 Difference]: With dead ends: 30 [2023-04-01 02:42:32,907 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 02:42:32,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 02:42:32,908 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:32,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 21 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:42:32,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 02:42:32,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2023-04-01 02:42:32,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:32,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-01 02:42:32,914 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2023-04-01 02:42:32,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:32,914 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-01 02:42:32,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:32,914 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-01 02:42:32,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 02:42:32,915 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:32,915 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:32,922 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 02:42:33,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:33,121 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:33,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:33,125 INFO L85 PathProgramCache]: Analyzing trace with hash 179700598, now seen corresponding path program 1 times [2023-04-01 02:42:33,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:33,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447626405] [2023-04-01 02:42:33,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:33,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:33,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:33,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:42:33,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:33,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447626405] [2023-04-01 02:42:33,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447626405] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:33,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782990993] [2023-04-01 02:42:33,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:33,242 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:33,243 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:33,244 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:33,270 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 02:42:33,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:33,311 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 02:42:33,312 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:33,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:42:33,338 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:33,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 02:42:33,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782990993] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:33,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292919265] [2023-04-01 02:42:33,388 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:33,388 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:33,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:33,393 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:33,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:33,446 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:33,622 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:33,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:33,664 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:34,022 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '302#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#b~0.base_BEFORE_CALL_1| Int) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (<= 2 |v_main_~#a~0.base_BEFORE_CALL_1|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_1|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_1|) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_1|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_1|) 0))) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:34,023 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:34,023 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:34,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 02:42:34,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444950753] [2023-04-01 02:42:34,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:34,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 02:42:34,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:34,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 02:42:34,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-04-01 02:42:34,027 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:34,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:34,066 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2023-04-01 02:42:34,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 02:42:34,067 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-01 02:42:34,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:34,069 INFO L225 Difference]: With dead ends: 39 [2023-04-01 02:42:34,069 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 02:42:34,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-04-01 02:42:34,071 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:34,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:42:34,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 02:42:34,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2023-04-01 02:42:34,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:34,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-01 02:42:34,083 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 14 [2023-04-01 02:42:34,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:34,083 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-01 02:42:34,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:34,083 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-01 02:42:34,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 02:42:34,085 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:34,085 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:34,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 02:42:34,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 02:42:34,292 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:34,292 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:34,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1054819487, now seen corresponding path program 2 times [2023-04-01 02:42:34,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:34,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803496512] [2023-04-01 02:42:34,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:34,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:34,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:34,351 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:42:34,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:34,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803496512] [2023-04-01 02:42:34,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803496512] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:34,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857652067] [2023-04-01 02:42:34,352 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:42:34,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:34,352 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:34,353 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:34,355 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 02:42:34,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 02:42:34,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:42:34,409 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 02:42:34,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:34,428 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:42:34,428 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:34,449 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 02:42:34,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857652067] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:34,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353957101] [2023-04-01 02:42:34,451 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:34,451 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:34,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:34,452 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:34,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:34,479 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:34,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:34,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:34,604 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:34,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '527#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_main_~#b~0.base_BEFORE_CALL_2| Int)) (and (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_2|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_2|) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_2|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_2|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_2|) 0))) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_2|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:34,923 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:34,923 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:34,923 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-01 02:42:34,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547022702] [2023-04-01 02:42:34,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:34,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 02:42:34,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:34,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 02:42:34,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2023-04-01 02:42:34,925 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:34,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:34,988 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2023-04-01 02:42:34,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 02:42:34,988 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 02:42:34,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:34,990 INFO L225 Difference]: With dead ends: 56 [2023-04-01 02:42:34,990 INFO L226 Difference]: Without dead ends: 44 [2023-04-01 02:42:34,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2023-04-01 02:42:34,993 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:34,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 29 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:42:34,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-01 02:42:35,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 28. [2023-04-01 02:42:35,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:35,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2023-04-01 02:42:35,005 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 18 [2023-04-01 02:42:35,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:35,005 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2023-04-01 02:42:35,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:35,005 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2023-04-01 02:42:35,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 02:42:35,006 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:35,006 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:35,013 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 02:42:35,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:35,207 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:35,207 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:35,207 INFO L85 PathProgramCache]: Analyzing trace with hash 117793887, now seen corresponding path program 3 times [2023-04-01 02:42:35,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:35,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436253530] [2023-04-01 02:42:35,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:35,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:35,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:35,372 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 02:42:35,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:35,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436253530] [2023-04-01 02:42:35,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436253530] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:35,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058562186] [2023-04-01 02:42:35,373 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:42:35,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:35,373 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:35,374 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:35,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 02:42:35,437 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:42:35,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:42:35,438 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 02:42:35,441 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:35,475 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 02:42:35,475 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:35,536 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 02:42:35,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058562186] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:35,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2050733396] [2023-04-01 02:42:35,539 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:35,539 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:35,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:35,540 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:35,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:35,556 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:35,645 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:35,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:35,663 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:35,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '844#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_main_~#b~0.base_BEFORE_CALL_3| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_3|) 4))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_3|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_3|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_3|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_3|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:35,957 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:35,957 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:35,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2023-04-01 02:42:35,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229728697] [2023-04-01 02:42:35,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:35,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-01 02:42:35,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:35,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-01 02:42:35,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=749, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 02:42:35,958 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 22 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:36,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:36,065 INFO L93 Difference]: Finished difference Result 87 states and 115 transitions. [2023-04-01 02:42:36,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-01 02:42:36,065 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 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 24 [2023-04-01 02:42:36,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:36,069 INFO L225 Difference]: With dead ends: 87 [2023-04-01 02:42:36,069 INFO L226 Difference]: Without dead ends: 71 [2023-04-01 02:42:36,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=307, Invalid=749, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 02:42:36,070 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:36,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 38 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:42:36,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-04-01 02:42:36,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 44. [2023-04-01 02:42:36,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:36,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2023-04-01 02:42:36,083 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 24 [2023-04-01 02:42:36,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:36,083 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2023-04-01 02:42:36,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:36,084 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2023-04-01 02:42:36,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 02:42:36,085 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:36,085 INFO L195 NwaCegarLoop]: trace histogram [19, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:36,090 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 02:42:36,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:36,290 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:36,290 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:36,290 INFO L85 PathProgramCache]: Analyzing trace with hash -175706634, now seen corresponding path program 4 times [2023-04-01 02:42:36,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:36,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710118362] [2023-04-01 02:42:36,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:36,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:36,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:36,452 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-01 02:42:36,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:36,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710118362] [2023-04-01 02:42:36,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710118362] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:36,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284722899] [2023-04-01 02:42:36,453 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:42:36,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:36,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:36,454 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:36,456 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 02:42:36,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:36,546 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 21 conjunts are in the unsatisfiable core [2023-04-01 02:42:36,549 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 02:42:36,654 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:36,954 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 02:42:36,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284722899] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:36,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104233658] [2023-04-01 02:42:36,955 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:36,955 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:36,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:36,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:36,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:36,968 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:37,027 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:37,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:37,040 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:37,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1374#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_main_~#b~0.base_BEFORE_CALL_4| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_4|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_4|) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_4|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_4|) 0))) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_4|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_4|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:37,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:37,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:37,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 22, 22] total 49 [2023-04-01 02:42:37,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873609487] [2023-04-01 02:42:37,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:37,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 02:42:37,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:37,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 02:42:37,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1306, Invalid=2234, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 02:42:37,361 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 49 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 49 states have internal predecessors, (62), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:37,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:37,558 INFO L93 Difference]: Finished difference Result 137 states and 186 transitions. [2023-04-01 02:42:37,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-04-01 02:42:37,559 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 49 states have internal predecessors, (62), 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 40 [2023-04-01 02:42:37,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:37,559 INFO L225 Difference]: With dead ends: 137 [2023-04-01 02:42:37,559 INFO L226 Difference]: Without dead ends: 118 [2023-04-01 02:42:37,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2043 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1306, Invalid=2234, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 02:42:37,561 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 67 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:37,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 20 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:42:37,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-04-01 02:42:37,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 76. [2023-04-01 02:42:37,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:37,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2023-04-01 02:42:37,576 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 40 [2023-04-01 02:42:37,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:37,576 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2023-04-01 02:42:37,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 49 states have internal predecessors, (62), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:37,577 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2023-04-01 02:42:37,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-01 02:42:37,579 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:37,579 INFO L195 NwaCegarLoop]: trace histogram [46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:37,584 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 02:42:37,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:37,784 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:37,784 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:37,785 INFO L85 PathProgramCache]: Analyzing trace with hash 1139220447, now seen corresponding path program 5 times [2023-04-01 02:42:37,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:37,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943800907] [2023-04-01 02:42:37,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:37,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:37,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:38,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-01 02:42:38,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:38,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943800907] [2023-04-01 02:42:38,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943800907] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:38,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296003922] [2023-04-01 02:42:38,211 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:42:38,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:38,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:38,212 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:38,214 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 02:42:40,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-01 02:42:40,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:42:40,272 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 02:42:40,274 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:40,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-01 02:42:40,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:40,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-01 02:42:40,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296003922] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:40,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1968594108] [2023-04-01 02:42:40,553 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:40,553 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:40,553 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:40,553 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:40,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:40,563 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:40,613 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:40,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:40,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:40,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2239#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_5| Int) (|v_main_~#b~0.base_BEFORE_CALL_5| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_5|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_5|) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_5|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_5|) 0))) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_5|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_5| |v_main_~#a~0.base_BEFORE_CALL_5|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_5|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_5|)) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_5| |#StackHeapBarrier|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:40,964 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:40,964 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:40,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2023-04-01 02:42:40,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90616418] [2023-04-01 02:42:40,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:40,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-01 02:42:40,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:40,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-01 02:42:40,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=1263, Unknown=0, NotChecked=0, Total=1892 [2023-04-01 02:42:40,967 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:41,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:41,256 INFO L93 Difference]: Finished difference Result 189 states and 236 transitions. [2023-04-01 02:42:41,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-01 02:42:41,256 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 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 72 [2023-04-01 02:42:41,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:41,257 INFO L225 Difference]: With dead ends: 189 [2023-04-01 02:42:41,257 INFO L226 Difference]: Without dead ends: 180 [2023-04-01 02:42:41,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=629, Invalid=1263, Unknown=0, NotChecked=0, Total=1892 [2023-04-01 02:42:41,258 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 81 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:41,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 47 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 02:42:41,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-04-01 02:42:41,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 92. [2023-04-01 02:42:41,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:41,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2023-04-01 02:42:41,266 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 72 [2023-04-01 02:42:41,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:41,266 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2023-04-01 02:42:41,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:41,266 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2023-04-01 02:42:41,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-04-01 02:42:41,267 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:41,267 INFO L195 NwaCegarLoop]: trace histogram [46, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:41,296 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 02:42:41,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:41,474 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:41,475 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:41,475 INFO L85 PathProgramCache]: Analyzing trace with hash -67279137, now seen corresponding path program 6 times [2023-04-01 02:42:41,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:41,475 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811767697] [2023-04-01 02:42:41,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:41,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:41,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:42,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-01 02:42:42,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:42,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811767697] [2023-04-01 02:42:42,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811767697] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:42,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893001403] [2023-04-01 02:42:42,340 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:42:42,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:42,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:42,341 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:42,345 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 02:42:42,508 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:42:42,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:42:42,511 INFO L262 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 02:42:42,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:42,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-04-01 02:42:42,800 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:44,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-04-01 02:42:44,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893001403] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:44,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325669425] [2023-04-01 02:42:44,476 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:44,476 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:44,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:44,477 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:44,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:44,497 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:44,586 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:44,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:44,603 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:45,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3406#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_6| Int) (|v_main_~#b~0.base_BEFORE_CALL_6| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_6|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_6| |#StackHeapBarrier|)) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_6|) 4))) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_6| |v_main_~#a~0.base_BEFORE_CALL_6|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_6|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_6|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_6|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_6|))) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:45,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:45,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:45,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 49, 49] total 118 [2023-04-01 02:42:45,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755200574] [2023-04-01 02:42:45,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:45,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-04-01 02:42:45,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:45,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-04-01 02:42:45,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7171, Invalid=9341, Unknown=0, NotChecked=0, Total=16512 [2023-04-01 02:42:45,033 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 118 states, 118 states have (on average 1.1610169491525424) internal successors, (137), 118 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:45,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:42:45,880 INFO L93 Difference]: Finished difference Result 335 states and 459 transitions. [2023-04-01 02:42:45,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-04-01 02:42:45,881 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.1610169491525424) internal successors, (137), 118 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2023-04-01 02:42:45,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:42:45,882 INFO L225 Difference]: With dead ends: 335 [2023-04-01 02:42:45,882 INFO L226 Difference]: Without dead ends: 295 [2023-04-01 02:42:45,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9018 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=7171, Invalid=9341, Unknown=0, NotChecked=0, Total=16512 [2023-04-01 02:42:45,885 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 140 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 337 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 337 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 02:42:45,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 56 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [337 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 02:42:45,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2023-04-01 02:42:45,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 172. [2023-04-01 02:42:45,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:42:45,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 174 transitions. [2023-04-01 02:42:45,896 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 174 transitions. Word has length 88 [2023-04-01 02:42:45,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:42:45,896 INFO L495 AbstractCegarLoop]: Abstraction has 172 states and 174 transitions. [2023-04-01 02:42:45,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.1610169491525424) internal successors, (137), 118 states have internal predecessors, (137), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:42:45,897 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 174 transitions. [2023-04-01 02:42:45,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2023-04-01 02:42:45,898 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:42:45,898 INFO L195 NwaCegarLoop]: trace histogram [115, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:42:45,904 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-01 02:42:46,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:46,104 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:42:46,105 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:42:46,105 INFO L85 PathProgramCache]: Analyzing trace with hash 406388726, now seen corresponding path program 7 times [2023-04-01 02:42:46,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:42:46,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793862436] [2023-04-01 02:42:46,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:42:46,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:42:46,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:47,764 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 6670 trivial. 0 not checked. [2023-04-01 02:42:47,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:42:47,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793862436] [2023-04-01 02:42:47,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793862436] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:42:47,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389574352] [2023-04-01 02:42:47,765 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:42:47,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:42:47,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:42:47,766 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:42:47,766 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 02:42:48,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:42:48,118 INFO L262 TraceCheckSpWp]: Trace formula consists of 1492 conjuncts, 117 conjunts are in the unsatisfiable core [2023-04-01 02:42:48,122 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:42:49,274 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-04-01 02:42:49,274 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:42:56,100 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-04-01 02:42:56,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389574352] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:42:56,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539398672] [2023-04-01 02:42:56,104 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:42:56,104 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:42:56,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:42:56,104 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:42:56,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:42:56,116 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-01 02:42:56,175 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-01 02:42:56,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 02:42:56,191 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:42:56,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5629#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_main_~#a~0.base_BEFORE_CALL_7| Int) (|v_main_~#b~0.base_BEFORE_CALL_7| Int)) (and (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_7|) 4) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_7|) 0))) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_7|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_7|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_7| |#StackHeapBarrier|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_7|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_7|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_7| |v_main_~#a~0.base_BEFORE_CALL_7|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:42:56,642 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:42:56,642 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:42:56,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 118, 118] total 254 [2023-04-01 02:42:56,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680907262] [2023-04-01 02:42:56,643 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:42:56,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 254 states [2023-04-01 02:42:56,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:42:56,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 254 interpolants. [2023-04-01 02:42:56,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32671, Invalid=37289, Unknown=0, NotChecked=0, Total=69960 [2023-04-01 02:42:56,655 INFO L87 Difference]: Start difference. First operand 172 states and 174 transitions. Second operand has 254 states, 254 states have (on average 1.125984251968504) internal successors, (286), 254 states have internal predecessors, (286), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:43:01,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:43:01,789 INFO L93 Difference]: Finished difference Result 580 states and 809 transitions. [2023-04-01 02:43:01,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 254 states. [2023-04-01 02:43:01,789 INFO L78 Accepts]: Start accepts. Automaton has has 254 states, 254 states have (on average 1.125984251968504) internal successors, (286), 254 states have internal predecessors, (286), 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 168 [2023-04-01 02:43:01,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:43:01,791 INFO L225 Difference]: With dead ends: 580 [2023-04-01 02:43:01,792 INFO L226 Difference]: Without dead ends: 529 [2023-04-01 02:43:01,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40895 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=32671, Invalid=37289, Unknown=0, NotChecked=0, Total=69960 [2023-04-01 02:43:01,795 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 299 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 785 mSolverCounterSat, 700 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 1485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 700 IncrementalHoareTripleChecker+Valid, 785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-01 02:43:01,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 110 Invalid, 1485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [700 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-01 02:43:01,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2023-04-01 02:43:01,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 333. [2023-04-01 02:43:01,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 327 states have (on average 1.0091743119266054) internal successors, (330), 327 states have internal predecessors, (330), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 02:43:01,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 335 transitions. [2023-04-01 02:43:01,813 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 335 transitions. Word has length 168 [2023-04-01 02:43:01,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:43:01,813 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 335 transitions. [2023-04-01 02:43:01,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 254 states, 254 states have (on average 1.125984251968504) internal successors, (286), 254 states have internal predecessors, (286), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:43:01,813 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 335 transitions. [2023-04-01 02:43:01,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2023-04-01 02:43:01,816 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:43:01,816 INFO L195 NwaCegarLoop]: trace histogram [251, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:43:01,824 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-01 02:43:02,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-01 02:43:02,023 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:43:02,023 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:43:02,023 INFO L85 PathProgramCache]: Analyzing trace with hash -700718193, now seen corresponding path program 8 times [2023-04-01 02:43:02,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:43:02,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364811073] [2023-04-01 02:43:02,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:43:02,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:43:02,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:43:06,253 INFO L134 CoverageAnalysis]: Checked inductivity of 33837 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 31626 trivial. 0 not checked. [2023-04-01 02:43:06,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:43:06,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364811073] [2023-04-01 02:43:06,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364811073] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:43:06,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969448668] [2023-04-01 02:43:06,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:43:06,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:43:06,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:43:06,255 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:43:06,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process