/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-eb0fd7c
[2020-09-21 10:32:11,745 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-21 10:32:11,750 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-21 10:32:11,794 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-21 10:32:11,794 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-21 10:32:11,805 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-21 10:32:11,807 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-09-21 10:32:11,811 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-09-21 10:32:11,814 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-21 10:32:11,817 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-21 10:32:11,818 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-09-21 10:32:11,819 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-21 10:32:11,820 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-21 10:32:11,823 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-21 10:32:11,825 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-21 10:32:11,827 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-21 10:32:11,829 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-21 10:32:11,830 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-21 10:32:11,832 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-21 10:32:11,839 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-21 10:32:11,842 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-21 10:32:11,843 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-21 10:32:11,844 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-21 10:32:11,845 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-21 10:32:11,849 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-21 10:32:11,849 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-21 10:32:11,850 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-21 10:32:11,853 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-21 10:32:11,853 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-21 10:32:11,854 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-21 10:32:11,854 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-21 10:32:11,855 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-21 10:32:11,856 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-21 10:32:11,857 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-21 10:32:11,858 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-21 10:32:11,858 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-09-21 10:32:11,860 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-09-21 10:32:11,862 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-21 10:32:11,863 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-09-21 10:32:11,910 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-21 10:32:11,910 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-21 10:32:11,912 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-21 10:32:11,912 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-21 10:32:11,913 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-21 10:32:11,913 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-21 10:32:11,913 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-21 10:32:11,913 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-21 10:32:11,914 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-21 10:32:11,914 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-21 10:32:11,915 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-21 10:32:11,915 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-21 10:32:11,915 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-21 10:32:11,916 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-21 10:32:11,916 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-21 10:32:11,916 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-21 10:32:11,917 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-21 10:32:11,917 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-21 10:32:11,917 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-21 10:32:11,917 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-21 10:32:11,917 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-21 10:32:11,918 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-21 10:32:11,918 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-21 10:32:11,918 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-21 10:32:11,918 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-21 10:32:11,918 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-21 10:32:11,919 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-21 10:32:11,919 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-21 10:32:11,919 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-21 10:32:11,919 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false
[2020-09-21 10:32:12,341 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-21 10:32:12,357 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-21 10:32:12,364 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-21 10:32:12,366 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-21 10:32:12,366 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-21 10:32:12,367 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:12,442 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/777af888c/1ab210d9ca5840ae947c06dbc90c47df/FLAG610e30ea4
[2020-09-21 10:32:13,204 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-21 10:32:13,205 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:13,233 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/777af888c/1ab210d9ca5840ae947c06dbc90c47df/FLAG610e30ea4
[2020-09-21 10:32:13,309 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/777af888c/1ab210d9ca5840ae947c06dbc90c47df
[2020-09-21 10:32:13,325 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-21 10:32:13,331 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-21 10:32:13,334 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-21 10:32:13,335 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-21 10:32:13,339 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-21 10:32:13,340 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:13" (1/1) ...
[2020-09-21 10:32:13,345 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48d9d4fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:13, skipping insertion in model container
[2020-09-21 10:32:13,345 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:13" (1/1) ...
[2020-09-21 10:32:13,356 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-21 10:32:13,526 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-21 10:32:15,026 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-21 10:32:15,047 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-21 10:32:16,004 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-21 10:32:16,046 INFO  L208         MainTranslator]: Completed translation
[2020-09-21 10:32:16,048 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16 WrapperNode
[2020-09-21 10:32:16,049 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-21 10:32:16,050 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-21 10:32:16,050 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-21 10:32:16,050 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-21 10:32:16,069 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,070 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,115 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,115 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,178 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,211 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,222 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
[2020-09-21 10:32:16,239 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-21 10:32:16,239 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-21 10:32:16,240 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-21 10:32:16,240 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-21 10:32:16,241 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-21 10:32:16,326 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-21 10:32:16,327 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-21 10:32:16,327 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-09-21 10:32:16,327 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-21 10:32:16,327 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-21 10:32:16,328 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-09-21 10:32:16,328 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-09-21 10:32:16,328 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-09-21 10:32:16,328 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-09-21 10:32:16,329 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-09-21 10:32:16,329 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-09-21 10:32:16,329 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-09-21 10:32:16,329 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-09-21 10:32:16,330 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-09-21 10:32:16,330 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-09-21 10:32:16,330 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-09-21 10:32:16,330 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-09-21 10:32:16,331 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-09-21 10:32:16,331 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-09-21 10:32:16,331 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-09-21 10:32:16,332 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-21 10:32:16,332 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-21 10:32:16,332 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-21 10:32:20,031 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-21 10:32:20,033 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-09-21 10:32:20,056 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:20 BoogieIcfgContainer
[2020-09-21 10:32:20,056 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-21 10:32:20,057 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-21 10:32:20,058 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-21 10:32:20,062 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-21 10:32:20,062 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:32:13" (1/3) ...
[2020-09-21 10:32:20,063 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@556a9719 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:20, skipping insertion in model container
[2020-09-21 10:32:20,063 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:16" (2/3) ...
[2020-09-21 10:32:20,064 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@556a9719 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:20, skipping insertion in model container
[2020-09-21 10:32:20,064 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:20" (3/3) ...
[2020-09-21 10:32:20,067 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:20,079 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-21 10:32:20,094 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-21 10:32:20,115 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-21 10:32:20,150 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-21 10:32:20,150 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-21 10:32:20,150 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-21 10:32:20,150 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-21 10:32:20,150 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-21 10:32:20,151 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-21 10:32:20,151 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-21 10:32:20,151 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-21 10:32:20,198 INFO  L276                IsEmpty]: Start isEmpty. Operand 1340 states.
[2020-09-21 10:32:20,251 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-09-21 10:32:20,251 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:32:20,253 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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]
[2020-09-21 10:32:20,253 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:32:20,261 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:32:20,262 INFO  L82        PathProgramCache]: Analyzing trace with hash -866812329, now seen corresponding path program 1 times
[2020-09-21 10:32:20,273 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:32:20,273 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827541209]
[2020-09-21 10:32:20,274 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:32:21,440 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:23,621 WARN  L193               SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 382
[2020-09-21 10:32:23,623 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:32:23,632 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:23,979 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:32:23,980 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827541209]
[2020-09-21 10:32:23,982 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:32:23,983 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:32:23,984 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167233230]
[2020-09-21 10:32:23,991 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:32:23,992 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:32:24,009 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:32:24,010 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:32:24,012 INFO  L87              Difference]: Start difference. First operand 1340 states. Second operand 4 states.
[2020-09-21 10:32:24,883 WARN  L193               SmtUtils]: Spent 776.00 ms on a formula simplification that was a NOOP. DAG size: 383
[2020-09-21 10:32:34,665 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:32:34,665 INFO  L93              Difference]: Finished difference Result 2262 states and 4032 transitions.
[2020-09-21 10:32:34,665 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-09-21 10:32:34,667 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 476
[2020-09-21 10:32:34,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:32:34,705 INFO  L225             Difference]: With dead ends: 2262
[2020-09-21 10:32:34,706 INFO  L226             Difference]: Without dead ends: 1993
[2020-09-21 10:32:34,711 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-09-21 10:32:34,736 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1993 states.
[2020-09-21 10:32:34,863 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1993 to 1991.
[2020-09-21 10:32:34,865 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1991 states.
[2020-09-21 10:32:34,874 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 3230 transitions.
[2020-09-21 10:32:34,877 INFO  L78                 Accepts]: Start accepts. Automaton has 1991 states and 3230 transitions. Word has length 476
[2020-09-21 10:32:34,879 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:32:34,879 INFO  L479      AbstractCegarLoop]: Abstraction has 1991 states and 3230 transitions.
[2020-09-21 10:32:34,879 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-09-21 10:32:34,880 INFO  L276                IsEmpty]: Start isEmpty. Operand 1991 states and 3230 transitions.
[2020-09-21 10:32:34,893 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-09-21 10:32:34,894 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:32:34,894 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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]
[2020-09-21 10:32:34,895 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-21 10:32:34,895 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:32:34,895 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:32:34,896 INFO  L82        PathProgramCache]: Analyzing trace with hash 168046341, now seen corresponding path program 1 times
[2020-09-21 10:32:34,896 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:32:34,896 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883615202]
[2020-09-21 10:32:34,896 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:32:36,074 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:37,575 WARN  L193               SmtUtils]: Spent 934.00 ms on a formula simplification that was a NOOP. DAG size: 382
[2020-09-21 10:32:37,577 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:32:37,588 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:38,238 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:32:38,239 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883615202]
[2020-09-21 10:32:38,239 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:32:38,239 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-09-21 10:32:38,240 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507825018]
[2020-09-21 10:32:38,242 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-21 10:32:38,242 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:32:38,243 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-21 10:32:38,243 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-09-21 10:32:38,243 INFO  L87              Difference]: Start difference. First operand 1991 states and 3230 transitions. Second operand 5 states.
[2020-09-21 10:32:52,211 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:32:52,211 INFO  L93              Difference]: Finished difference Result 5904 states and 9579 transitions.
[2020-09-21 10:32:52,214 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-09-21 10:32:52,214 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 476
[2020-09-21 10:32:52,215 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:32:52,238 INFO  L225             Difference]: With dead ends: 5904
[2020-09-21 10:32:52,238 INFO  L226             Difference]: Without dead ends: 3930
[2020-09-21 10:32:52,247 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-09-21 10:32:52,252 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3930 states.
[2020-09-21 10:32:52,388 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3930 to 3928.
[2020-09-21 10:32:52,389 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3928 states.
[2020-09-21 10:32:52,400 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3928 states to 3928 states and 6348 transitions.
[2020-09-21 10:32:52,400 INFO  L78                 Accepts]: Start accepts. Automaton has 3928 states and 6348 transitions. Word has length 476
[2020-09-21 10:32:52,401 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:32:52,401 INFO  L479      AbstractCegarLoop]: Abstraction has 3928 states and 6348 transitions.
[2020-09-21 10:32:52,401 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-21 10:32:52,401 INFO  L276                IsEmpty]: Start isEmpty. Operand 3928 states and 6348 transitions.
[2020-09-21 10:32:52,420 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 479
[2020-09-21 10:32:52,420 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:32:52,421 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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]
[2020-09-21 10:32:52,422 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-21 10:32:52,426 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:32:52,426 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:32:52,427 INFO  L82        PathProgramCache]: Analyzing trace with hash 1082038238, now seen corresponding path program 1 times
[2020-09-21 10:32:52,427 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:32:52,427 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046539470]
[2020-09-21 10:32:52,430 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:32:52,717 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:53,833 WARN  L193               SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 382
[2020-09-21 10:32:53,835 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:32:53,843 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:54,115 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:32:54,116 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046539470]
[2020-09-21 10:32:54,116 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:32:54,116 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:32:54,117 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795501114]
[2020-09-21 10:32:54,118 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:32:54,118 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:32:54,118 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:32:54,118 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:32:54,119 INFO  L87              Difference]: Start difference. First operand 3928 states and 6348 transitions. Second operand 4 states.