/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 EqDomain -i ../sv-benchmarks/c/eca-rers2012/Problem16_label41.c


--------------------------------------------------------------------------------


This is Ultimate 0.2.3-dev-f954360
[2023-04-01 10:22:21,639 INFO  L177        SettingsManager]: Resetting all preferences to default values...
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[2023-04-01 10:22:21,674 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2023-04-01 10:22:21,707 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2023-04-01 10:22:21,709 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 10:22:21,731 INFO  L113        SettingsManager]: Loading preferences was successful
[2023-04-01 10:22:21,731 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2023-04-01 10:22:21,732 INFO  L136        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-04-01 10:22:21,732 INFO  L138        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-04-01 10:22:21,732 INFO  L136        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-04-01 10:22:21,732 INFO  L138        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-04-01 10:22:21,733 INFO  L138        SettingsManager]:  * User list type=DISABLED
[2023-04-01 10:22:21,733 INFO  L136        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-04-01 10:22:21,733 INFO  L138        SettingsManager]:  * Explicit value domain=true
[2023-04-01 10:22:21,733 INFO  L138        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-04-01 10:22:21,733 INFO  L138        SettingsManager]:  * Octagon Domain=false
[2023-04-01 10:22:21,733 INFO  L138        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Interval Domain=false
[2023-04-01 10:22:21,734 INFO  L136        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-04-01 10:22:21,734 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * sizeof long=4
[2023-04-01 10:22:21,734 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * sizeof long double=12
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2023-04-01 10:22:21,735 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-04-01 10:22:21,736 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-04-01 10:22:21,736 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Abstract interpretation Mode=USE_PREDICATES
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-04-01 10:22:21,736 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-04-01 10:22:21,737 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-04-01 10:22:21,737 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-04-01 10:22:21,737 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$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain
[2023-04-01 10:22:21,897 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-04-01 10:22:21,917 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-04-01 10:22:21,918 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-04-01 10:22:21,919 INFO  L271        PluginConnector]: Initializing CDTParser...
[2023-04-01 10:22:21,920 INFO  L275        PluginConnector]: CDTParser initialized
[2023-04-01 10:22:21,920 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem16_label41.c
[2023-04-01 10:22:22,815 INFO  L500              CDTParser]: Created temporary CDT project at NULL
[2023-04-01 10:22:23,066 INFO  L351              CDTParser]: Found 1 translation units.
[2023-04-01 10:22:23,067 INFO  L172              CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem16_label41.c
[2023-04-01 10:22:23,081 INFO  L394              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/520807f27/a3c908c25cd2480fb9afc16ccb431cd0/FLAG6485d0da1
[2023-04-01 10:22:23,090 INFO  L402              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/520807f27/a3c908c25cd2480fb9afc16ccb431cd0
[2023-04-01 10:22:23,091 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-04-01 10:22:23,092 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2023-04-01 10:22:23,093 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-04-01 10:22:23,093 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-04-01 10:22:23,095 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-04-01 10:22:23,095 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,096 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4faa8579 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23, skipping insertion in model container
[2023-04-01 10:22:23,096 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,100 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2023-04-01 10:22:23,152 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2023-04-01 10:22:23,288 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/eca-rers2012/Problem16_label41.c[2609,2622]
[2023-04-01 10:22:23,512 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-04-01 10:22:23,520 INFO  L203         MainTranslator]: Completed pre-run
[2023-04-01 10:22:23,529 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/eca-rers2012/Problem16_label41.c[2609,2622]
[2023-04-01 10:22:23,675 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-04-01 10:22:23,685 INFO  L208         MainTranslator]: Completed translation
[2023-04-01 10:22:23,685 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23 WrapperNode
[2023-04-01 10:22:23,685 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-04-01 10:22:23,686 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-04-01 10:22:23,686 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2023-04-01 10:22:23,686 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2023-04-01 10:22:23,693 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,693 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,708 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,709 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,747 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,753 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,760 INFO  L185        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,769 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,776 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-04-01 10:22:23,776 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-04-01 10:22:23,777 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2023-04-01 10:22:23,777 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2023-04-01 10:22:23,777 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (1/1) ...
[2023-04-01 10:22:23,781 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-04-01 10:22:23,789 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 10:22:23,830 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 10:22:23,899 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 10:22:23,911 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2023-04-01 10:22:23,911 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-04-01 10:22:23,911 INFO  L138     BoogieDeclarations]: Found implementation of procedure reach_error
[2023-04-01 10:22:23,912 INFO  L138     BoogieDeclarations]: Found implementation of procedure calculate_output
[2023-04-01 10:22:23,912 INFO  L138     BoogieDeclarations]: Found implementation of procedure calculate_output2
[2023-04-01 10:22:23,912 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2023-04-01 10:22:23,912 INFO  L130     BoogieDeclarations]: Found specification of procedure calculate_output
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure calculate_output2
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure __assert_fail
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure reach_error
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure exit
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2023-04-01 10:22:23,913 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2023-04-01 10:22:23,914 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-04-01 10:22:23,914 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-04-01 10:22:23,914 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2023-04-01 10:22:23,914 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2023-04-01 10:22:23,914 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2023-04-01 10:22:23,982 INFO  L236             CfgBuilder]: Building ICFG
[2023-04-01 10:22:23,983 INFO  L262             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-04-01 10:22:25,305 INFO  L277             CfgBuilder]: Performing block encoding
[2023-04-01 10:22:26,039 INFO  L297             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-04-01 10:22:26,039 INFO  L302             CfgBuilder]: Removed 1 assume(true) statements.
[2023-04-01 10:22:26,041 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:22:26 BoogieIcfgContainer
[2023-04-01 10:22:26,041 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-04-01 10:22:26,042 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-04-01 10:22:26,043 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2023-04-01 10:22:26,044 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2023-04-01 10:22:26,045 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 10:22:23" (1/3) ...
[2023-04-01 10:22:26,045 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447b9197 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:22:26, skipping insertion in model container
[2023-04-01 10:22:26,045 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 10:22:23" (2/3) ...
[2023-04-01 10:22:26,045 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447b9197 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 10:22:26, skipping insertion in model container
[2023-04-01 10:22:26,045 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 10:22:26" (3/3) ...
[2023-04-01 10:22:26,046 INFO  L112   eAbstractionObserver]: Analyzing ICFG Problem16_label41.c
[2023-04-01 10:22:26,057 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-04-01 10:22:26,057 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-04-01 10:22:26,088 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-04-01 10:22:26,092 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;@63fbbedb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-04-01 10:22:26,092 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-04-01 10:22:26,096 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)
[2023-04-01 10:22:26,100 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2023-04-01 10:22:26,100 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:26,100 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:26,100 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:26,103 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:26,103 INFO  L85        PathProgramCache]: Analyzing trace with hash -706739098, now seen corresponding path program 1 times
[2023-04-01 10:22:26,109 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:26,110 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106941828]
[2023-04-01 10:22:26,110 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:26,110 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:26,221 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:26,409 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 10:22:26,410 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:26,410 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106941828]
[2023-04-01 10:22:26,410 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106941828] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 10:22:26,410 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 10:22:26,410 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-04-01 10:22:26,411 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886606094]
[2023-04-01 10:22:26,412 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 10:22:26,414 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-04-01 10:22:26,414 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 10:22:26,439 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-04-01 10:22:26,440 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-04-01 10:22:26,443 INFO  L87              Difference]: Start difference. First operand  has 244 states, 234 states have (on average 1.9572649572649572) internal successors, (458), 235 states have internal predecessors, (458), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 10:22:27,777 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 10:22:27,777 INFO  L93              Difference]: Finished difference Result 718 states and 1389 transitions.
[2023-04-01 10:22:27,778 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-04-01 10:22:27,779 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11
[2023-04-01 10:22:27,779 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 10:22:27,793 INFO  L225             Difference]: With dead ends: 718
[2023-04-01 10:22:27,793 INFO  L226             Difference]: Without dead ends: 471
[2023-04-01 10:22:27,805 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 10:22:27,822 INFO  L413           NwaCegarLoop]: 75 mSDtfsCounter, 247 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 317 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time
[2023-04-01 10:22:27,823 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 90 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time]
[2023-04-01 10:22:27,835 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 471 states.
[2023-04-01 10:22:27,914 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 468.
[2023-04-01 10:22:27,916 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 468 states, 458 states have (on average 1.8384279475982532) internal successors, (842), 458 states have internal predecessors, (842), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6)
[2023-04-01 10:22:27,917 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 853 transitions.
[2023-04-01 10:22:27,918 INFO  L78                 Accepts]: Start accepts. Automaton has 468 states and 853 transitions. Word has length 11
[2023-04-01 10:22:27,918 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 10:22:27,919 INFO  L495      AbstractCegarLoop]: Abstraction has 468 states and 853 transitions.
[2023-04-01 10:22:27,919 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 10:22:27,919 INFO  L276                IsEmpty]: Start isEmpty. Operand 468 states and 853 transitions.
[2023-04-01 10:22:27,920 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2023-04-01 10:22:27,920 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:27,920 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:27,920 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-04-01 10:22:27,920 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:27,923 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:27,923 INFO  L85        PathProgramCache]: Analyzing trace with hash 456054072, now seen corresponding path program 1 times
[2023-04-01 10:22:27,923 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:27,923 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532077326]
[2023-04-01 10:22:27,923 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:27,924 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:27,959 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:28,050 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-04-01 10:22:28,051 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:28,051 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532077326]
[2023-04-01 10:22:28,051 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532077326] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 10:22:28,051 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 10:22:28,051 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-04-01 10:22:28,051 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298843136]
[2023-04-01 10:22:28,051 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 10:22:28,052 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 10:22:28,052 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 10:22:28,053 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 10:22:28,053 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-04-01 10:22:28,053 INFO  L87              Difference]: Start difference. First operand 468 states and 853 transitions. Second operand  has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:29,117 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 10:22:29,118 INFO  L93              Difference]: Finished difference Result 1410 states and 2605 transitions.
[2023-04-01 10:22:29,119 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2023-04-01 10:22:29,119 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22
[2023-04-01 10:22:29,119 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 10:22:29,125 INFO  L225             Difference]: With dead ends: 1410
[2023-04-01 10:22:29,126 INFO  L226             Difference]: Without dead ends: 947
[2023-04-01 10:22:29,131 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56
[2023-04-01 10:22:29,131 INFO  L413           NwaCegarLoop]: 17 mSDtfsCounter, 889 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1247 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 889 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 1247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time
[2023-04-01 10:22:29,132 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [889 Valid, 43 Invalid, 1644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 1247 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time]
[2023-04-01 10:22:29,133 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 947 states.
[2023-04-01 10:22:29,202 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 947 to 924.
[2023-04-01 10:22:29,204 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 924 states, 906 states have (on average 1.7339955849889626) internal successors, (1571), 910 states have internal predecessors, (1571), 7 states have call successors, (7), 7 states have call predecessors, (7), 10 states have return successors, (26), 6 states have call predecessors, (26), 6 states have call successors, (26)
[2023-04-01 10:22:29,207 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 924 states to 924 states and 1604 transitions.
[2023-04-01 10:22:29,207 INFO  L78                 Accepts]: Start accepts. Automaton has 924 states and 1604 transitions. Word has length 22
[2023-04-01 10:22:29,207 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 10:22:29,208 INFO  L495      AbstractCegarLoop]: Abstraction has 924 states and 1604 transitions.
[2023-04-01 10:22:29,208 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:29,208 INFO  L276                IsEmpty]: Start isEmpty. Operand 924 states and 1604 transitions.
[2023-04-01 10:22:29,208 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2023-04-01 10:22:29,208 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:29,209 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:29,209 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2023-04-01 10:22:29,209 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:29,209 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:29,209 INFO  L85        PathProgramCache]: Analyzing trace with hash -1808182885, now seen corresponding path program 1 times
[2023-04-01 10:22:29,209 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:29,209 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988008581]
[2023-04-01 10:22:29,210 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:29,210 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:29,220 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:29,274 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-04-01 10:22:29,275 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:29,275 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988008581]
[2023-04-01 10:22:29,275 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988008581] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 10:22:29,275 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 10:22:29,275 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-04-01 10:22:29,275 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122247464]
[2023-04-01 10:22:29,275 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 10:22:29,275 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 10:22:29,276 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 10:22:29,276 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 10:22:29,276 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-04-01 10:22:29,276 INFO  L87              Difference]: Start difference. First operand 924 states and 1604 transitions. Second operand  has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:30,331 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 10:22:30,331 INFO  L93              Difference]: Finished difference Result 2556 states and 4514 transitions.
[2023-04-01 10:22:30,331 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2023-04-01 10:22:30,332 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23
[2023-04-01 10:22:30,332 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 10:22:30,339 INFO  L225             Difference]: With dead ends: 2556
[2023-04-01 10:22:30,339 INFO  L226             Difference]: Without dead ends: 1637
[2023-04-01 10:22:30,343 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56
[2023-04-01 10:22:30,345 INFO  L413           NwaCegarLoop]: 16 mSDtfsCounter, 994 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 439 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 994 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 439 IncrementalHoareTripleChecker+Valid, 1145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time
[2023-04-01 10:22:30,346 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [994 Valid, 45 Invalid, 1584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [439 Valid, 1145 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time]
[2023-04-01 10:22:30,348 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1637 states.
[2023-04-01 10:22:30,379 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1637 to 1605.
[2023-04-01 10:22:30,381 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 1605 states, 1573 states have (on average 1.477431659249841) internal successors, (2324), 1583 states have internal predecessors, (2324), 11 states have call successors, (11), 11 states have call predecessors, (11), 20 states have return successors, (69), 10 states have call predecessors, (69), 10 states have call successors, (69)
[2023-04-01 10:22:30,386 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 2404 transitions.
[2023-04-01 10:22:30,386 INFO  L78                 Accepts]: Start accepts. Automaton has 1605 states and 2404 transitions. Word has length 23
[2023-04-01 10:22:30,386 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 10:22:30,386 INFO  L495      AbstractCegarLoop]: Abstraction has 1605 states and 2404 transitions.
[2023-04-01 10:22:30,386 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:30,386 INFO  L276                IsEmpty]: Start isEmpty. Operand 1605 states and 2404 transitions.
[2023-04-01 10:22:30,389 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 93
[2023-04-01 10:22:30,389 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:30,390 INFO  L195           NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:30,390 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2023-04-01 10:22:30,390 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:30,391 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:30,391 INFO  L85        PathProgramCache]: Analyzing trace with hash -1155475273, now seen corresponding path program 1 times
[2023-04-01 10:22:30,391 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:30,391 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173918090]
[2023-04-01 10:22:30,391 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:30,391 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:30,431 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:30,605 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2023-04-01 10:22:30,605 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:30,605 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173918090]
[2023-04-01 10:22:30,605 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173918090] provided 0 perfect and 1 imperfect interpolant sequences
[2023-04-01 10:22:30,605 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865758341]
[2023-04-01 10:22:30,605 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:30,606 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 10:22:30,606 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 10:22:30,608 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 10:22:30,627 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 10:22:30,706 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:30,707 INFO  L262         TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 4 conjunts are in the unsatisfiable core
[2023-04-01 10:22:30,711 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-04-01 10:22:30,744 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked.
[2023-04-01 10:22:30,744 INFO  L323         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2023-04-01 10:22:30,744 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865758341] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 10:22:30,744 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2023-04-01 10:22:30,744 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5
[2023-04-01 10:22:30,744 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29307108]
[2023-04-01 10:22:30,744 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 10:22:30,745 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-04-01 10:22:30,745 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 10:22:30,745 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-04-01 10:22:30,745 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20
[2023-04-01 10:22:30,745 INFO  L87              Difference]: Start difference. First operand 1605 states and 2404 transitions. Second operand  has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3)
[2023-04-01 10:22:31,400 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 10:22:31,400 INFO  L93              Difference]: Finished difference Result 3436 states and 5156 transitions.
[2023-04-01 10:22:31,402 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-04-01 10:22:31,402 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 92
[2023-04-01 10:22:31,402 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 10:22:31,407 INFO  L225             Difference]: With dead ends: 3436
[2023-04-01 10:22:31,407 INFO  L226             Difference]: Without dead ends: 1836
[2023-04-01 10:22:31,458 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20
[2023-04-01 10:22:31,459 INFO  L413           NwaCegarLoop]: 407 mSDtfsCounter, 237 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time
[2023-04-01 10:22:31,460 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 423 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time]
[2023-04-01 10:22:31,461 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1836 states.
[2023-04-01 10:22:31,485 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1836 to 1830.
[2023-04-01 10:22:31,487 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 1830 states, 1796 states have (on average 1.4387527839643652) internal successors, (2584), 1806 states have internal predecessors, (2584), 12 states have call successors, (12), 12 states have call predecessors, (12), 21 states have return successors, (81), 11 states have call predecessors, (81), 11 states have call successors, (81)
[2023-04-01 10:22:31,492 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1830 states to 1830 states and 2677 transitions.
[2023-04-01 10:22:31,492 INFO  L78                 Accepts]: Start accepts. Automaton has 1830 states and 2677 transitions. Word has length 92
[2023-04-01 10:22:31,494 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 10:22:31,494 INFO  L495      AbstractCegarLoop]: Abstraction has 1830 states and 2677 transitions.
[2023-04-01 10:22:31,494 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3)
[2023-04-01 10:22:31,494 INFO  L276                IsEmpty]: Start isEmpty. Operand 1830 states and 2677 transitions.
[2023-04-01 10:22:31,501 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 136
[2023-04-01 10:22:31,501 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:31,501 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:31,519 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 10:22:31,707 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 10:22:31,708 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:31,709 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:31,709 INFO  L85        PathProgramCache]: Analyzing trace with hash 1897282491, now seen corresponding path program 1 times
[2023-04-01 10:22:31,709 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:31,710 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514091532]
[2023-04-01 10:22:31,710 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:31,710 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:31,741 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:31,948 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-04-01 10:22:31,948 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:31,948 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514091532]
[2023-04-01 10:22:31,948 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514091532] provided 1 perfect and 0 imperfect interpolant sequences
[2023-04-01 10:22:31,948 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-04-01 10:22:31,949 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-04-01 10:22:31,949 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295887886]
[2023-04-01 10:22:31,951 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-04-01 10:22:31,952 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-04-01 10:22:31,957 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-04-01 10:22:31,957 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-04-01 10:22:31,957 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-04-01 10:22:31,957 INFO  L87              Difference]: Start difference. First operand 1830 states and 2677 transitions. Second operand  has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:33,226 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-04-01 10:22:33,226 INFO  L93              Difference]: Finished difference Result 4851 states and 7168 transitions.
[2023-04-01 10:22:33,228 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2023-04-01 10:22:33,229 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 135
[2023-04-01 10:22:33,229 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-04-01 10:22:33,243 INFO  L225             Difference]: With dead ends: 4851
[2023-04-01 10:22:33,244 INFO  L226             Difference]: Without dead ends: 3026
[2023-04-01 10:22:33,248 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56
[2023-04-01 10:22:33,251 INFO  L413           NwaCegarLoop]: 17 mSDtfsCounter, 570 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1293 mSolverCounterSat, 423 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 570 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 423 IncrementalHoareTripleChecker+Valid, 1293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time
[2023-04-01 10:22:33,251 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [570 Valid, 43 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [423 Valid, 1293 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time]
[2023-04-01 10:22:33,254 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3026 states.
[2023-04-01 10:22:33,320 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3026 to 2976.
[2023-04-01 10:22:33,323 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 2976 states, 2911 states have (on average 1.389556853315012) internal successors, (4045), 2942 states have internal predecessors, (4045), 17 states have call successors, (17), 17 states have call predecessors, (17), 47 states have return successors, (229), 16 states have call predecessors, (229), 16 states have call successors, (229)
[2023-04-01 10:22:33,331 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2976 states to 2976 states and 4291 transitions.
[2023-04-01 10:22:33,332 INFO  L78                 Accepts]: Start accepts. Automaton has 2976 states and 4291 transitions. Word has length 135
[2023-04-01 10:22:33,332 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-04-01 10:22:33,332 INFO  L495      AbstractCegarLoop]: Abstraction has 2976 states and 4291 transitions.
[2023-04-01 10:22:33,332 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 25.8) internal successors, (129), 4 states have internal predecessors, (129), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-04-01 10:22:33,332 INFO  L276                IsEmpty]: Start isEmpty. Operand 2976 states and 4291 transitions.
[2023-04-01 10:22:33,337 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 145
[2023-04-01 10:22:33,337 INFO  L187           NwaCegarLoop]: Found error trace
[2023-04-01 10:22:33,337 INFO  L195           NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-04-01 10:22:33,337 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2023-04-01 10:22:33,337 INFO  L420      AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-04-01 10:22:33,338 INFO  L145       PredicateUnifier]: Initialized classic predicate unifier
[2023-04-01 10:22:33,338 INFO  L85        PathProgramCache]: Analyzing trace with hash 1286703004, now seen corresponding path program 1 times
[2023-04-01 10:22:33,338 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-04-01 10:22:33,338 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956051558]
[2023-04-01 10:22:33,339 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:33,339 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-04-01 10:22:33,376 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:33,534 INFO  L134       CoverageAnalysis]: Checked inductivity of 89 backedges. 79 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked.
[2023-04-01 10:22:33,534 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-04-01 10:22:33,534 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956051558]
[2023-04-01 10:22:33,534 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956051558] provided 0 perfect and 1 imperfect interpolant sequences
[2023-04-01 10:22:33,534 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272022036]
[2023-04-01 10:22:33,535 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-04-01 10:22:33,535 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-04-01 10:22:33,535 INFO  L189       MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
[2023-04-01 10:22:33,536 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 10:22:33,573 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 10:22:33,679 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-04-01 10:22:33,682 INFO  L262         TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 4 conjunts are in the unsatisfiable core
[2023-04-01 10:22:33,684 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-04-01 10:22:33,786 INFO  L134       CoverageAnalysis]: Checked inductivity of 89 backedges. 79 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked.
[2023-04-01 10:22:33,786 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-04-01 10:22:33,996 INFO  L134       CoverageAnalysis]: Checked inductivity of 89 backedges. 79 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked.
[2023-04-01 10:22:33,997 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [272022036] provided 0 perfect and 2 imperfect interpolant sequences
[2023-04-01 10:22:33,997 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758185724]
[2023-04-01 10:22:34,045 INFO  L159        IcfgInterpreter]: Started Sifa with 77 locations of interest
[2023-04-01 10:22:34,046 INFO  L166        IcfgInterpreter]: Building call graph
[2023-04-01 10:22:34,048 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-04-01 10:22:34,051 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-04-01 10:22:34,051 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-04-01 10:22:34,294 INFO  L197        IcfgInterpreter]: Interpreting procedure main with input of size 78 for LOIs
[2023-04-01 10:22:34,466 WARN  L137   XnfTransformerHelper]: expecting exponential blowup for input size 17
[2023-04-01 10:22:36,825 WARN  L137   XnfTransformerHelper]: expecting exponential blowup for input size 44
[2023-04-01 10:22:54,031 WARN  L176   XnfTransformerHelper]: Simplifying disjunction of 491568 conjuctions. This might take some time...