/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 true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 15:05:13,843 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 15:05:13,846 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 15:05:13,890 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 15:05:13,890 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 15:05:13,903 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 15:05:13,904 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 15:05:13,908 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 15:05:13,909 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 15:05:13,911 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 15:05:13,912 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 15:05:13,914 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 15:05:13,914 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 15:05:13,919 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 15:05:13,921 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 15:05:13,922 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 15:05:13,923 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 15:05:13,925 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 15:05:13,927 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 15:05:13,933 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 15:05:13,934 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 15:05:13,937 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 15:05:13,938 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 15:05:13,939 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 15:05:13,944 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 15:05:13,944 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 15:05:13,944 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 15:05:13,947 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 15:05:13,948 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 15:05:13,949 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 15:05:13,950 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 15:05:13,950 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 15:05:13,951 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 15:05:13,952 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 15:05:13,953 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 15:05:13,953 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 15:05:13,954 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-21 15:05:13,954 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-21 15:05:13,956 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 15:05:13,957 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
[2020-08-21 15:05:14,001 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 15:05:14,001 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 15:05:14,003 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 15:05:14,003 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 15:05:14,003 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 15:05:14,003 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 15:05:14,004 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 15:05:14,004 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 15:05:14,004 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 15:05:14,004 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 15:05:14,005 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 15:05:14,006 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 15:05:14,006 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 15:05:14,006 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 15:05:14,007 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 15:05:14,007 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 15:05:14,007 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 15:05:14,007 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 15:05:14,007 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 15:05:14,008 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 15:05:14,008 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 15:05:14,008 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 15:05:14,008 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 15:05:14,008 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 15:05:14,009 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 15:05:14,009 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 15:05:14,009 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 15:05:14,009 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 15:05:14,009 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 15:05:14,010 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 -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true;
[2020-08-21 15:05:14,294 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 15:05:14,314 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 15:05:14,318 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 15:05:14,319 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 15:05:14,322 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 15:05:14,323 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:14,384 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b254089c0/6bdc37eef1ba4d97b03bbd1763cc711b/FLAG86522158d
[2020-08-21 15:05:15,107 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 15:05:15,108 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:15,134 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b254089c0/6bdc37eef1ba4d97b03bbd1763cc711b/FLAG86522158d
[2020-08-21 15:05:15,230 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b254089c0/6bdc37eef1ba4d97b03bbd1763cc711b
[2020-08-21 15:05:15,241 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 15:05:15,243 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 15:05:15,244 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:15,244 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 15:05:15,248 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 15:05:15,249 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:15" (1/1) ...
[2020-08-21 15:05:15,252 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@368a0f4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:15, skipping insertion in model container
[2020-08-21 15:05:15,252 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:15" (1/1) ...
[2020-08-21 15:05:15,260 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 15:05:15,408 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 15:05:16,833 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:16,848 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 15:05:18,162 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:18,198 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 15:05:18,200 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18 WrapperNode
[2020-08-21 15:05:18,200 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:18,201 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 15:05:18,201 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 15:05:18,201 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 15:05:18,218 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,221 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,301 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,303 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,403 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,457 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,476 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (1/1) ...
[2020-08-21 15:05:18,497 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 15:05:18,498 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 15:05:18,498 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 15:05:18,498 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 15:05:18,500 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (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
[2020-08-21 15:05:18,589 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 15:05:18,589 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 15:05:18,590 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 15:05:18,590 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 15:05:18,591 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 15:05:18,591 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 15:05:18,591 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 15:05:18,591 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 15:05:18,592 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 15:05:18,592 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 15:05:18,593 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 15:05:18,593 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 15:05:18,593 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 15:05:18,594 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 15:05:18,594 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 15:05:18,595 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 15:05:18,595 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-21 15:05:18,595 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 15:05:18,596 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 15:05:18,596 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 15:05:18,596 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 15:05:18,596 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 15:05:22,302 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 15:05:22,303 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 15:05:22,316 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:05:22 BoogieIcfgContainer
[2020-08-21 15:05:22,316 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 15:05:22,317 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 15:05:22,317 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 15:05:22,321 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 15:05:22,321 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:05:15" (1/3) ...
[2020-08-21 15:05:22,322 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e4565c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:05:22, skipping insertion in model container
[2020-08-21 15:05:22,322 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:18" (2/3) ...
[2020-08-21 15:05:22,322 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e4565c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:05:22, skipping insertion in model container
[2020-08-21 15:05:22,322 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:05:22" (3/3) ...
[2020-08-21 15:05:22,324 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:22,335 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 15:05:22,345 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 15:05:22,362 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 15:05:22,395 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 15:05:22,395 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 15:05:22,395 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 15:05:22,395 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 15:05:22,395 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 15:05:22,396 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 15:05:22,396 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 15:05:22,396 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 15:05:22,437 INFO  L276                IsEmpty]: Start isEmpty. Operand 1322 states.
[2020-08-21 15:05:22,474 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-21 15:05:22,475 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:05:22,476 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]
[2020-08-21 15:05:22,477 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:05:22,483 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:05:22,484 INFO  L82        PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times
[2020-08-21 15:05:22,493 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:05:22,494 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816087874]
[2020-08-21 15:05:22,494 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:05:23,497 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:25,007 WARN  L193               SmtUtils]: Spent 864.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 15:05:25,010 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:05:25,020 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:25,415 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:05:25,416 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816087874]
[2020-08-21 15:05:25,418 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:05:25,418 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:05:25,419 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385162654]
[2020-08-21 15:05:25,425 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:05:25,426 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:05:25,439 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:05:25,440 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:05:25,443 INFO  L87              Difference]: Start difference. First operand 1322 states. Second operand 4 states.
[2020-08-21 15:05:26,244 WARN  L193               SmtUtils]: Spent 714.00 ms on a formula simplification that was a NOOP. DAG size: 389
[2020-08-21 15:05:35,633 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:05:35,633 INFO  L93              Difference]: Finished difference Result 2212 states and 3947 transitions.
[2020-08-21 15:05:35,634 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:05:35,636 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 467
[2020-08-21 15:05:35,638 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:05:35,677 INFO  L225             Difference]: With dead ends: 2212
[2020-08-21 15:05:35,677 INFO  L226             Difference]: Without dead ends: 1956
[2020-08-21 15:05:35,684 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 15:05:35,705 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1956 states.
[2020-08-21 15:05:35,861 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954.
[2020-08-21 15:05:35,862 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1954 states.
[2020-08-21 15:05:35,872 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions.
[2020-08-21 15:05:35,875 INFO  L78                 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467
[2020-08-21 15:05:35,876 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:05:35,877 INFO  L479      AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions.
[2020-08-21 15:05:35,877 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:05:35,877 INFO  L276                IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions.
[2020-08-21 15:05:35,889 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-21 15:05:35,889 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:05:35,890 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]
[2020-08-21 15:05:35,891 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 15:05:35,891 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:05:35,891 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:05:35,892 INFO  L82        PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times
[2020-08-21 15:05:35,892 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:05:35,892 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401132467]
[2020-08-21 15:05:35,893 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:05:37,309 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:38,509 WARN  L193               SmtUtils]: Spent 830.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 15:05:38,511 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:05:38,519 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:38,813 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:05:38,814 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401132467]
[2020-08-21 15:05:38,814 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:05:38,814 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 15:05:38,815 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627262239]
[2020-08-21 15:05:38,817 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 15:05:38,817 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:05:38,817 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 15:05:38,818 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 15:05:38,818 INFO  L87              Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states.
[2020-08-21 15:05:52,511 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:05:52,512 INFO  L93              Difference]: Finished difference Result 5793 states and 9438 transitions.
[2020-08-21 15:05:52,515 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:05:52,516 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 467
[2020-08-21 15:05:52,516 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:05:52,534 INFO  L225             Difference]: With dead ends: 5793
[2020-08-21 15:05:52,535 INFO  L226             Difference]: Without dead ends: 3856
[2020-08-21 15:05:52,542 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 15:05:52,548 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3856 states.
[2020-08-21 15:05:52,686 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854.
[2020-08-21 15:05:52,687 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3854 states.
[2020-08-21 15:05:52,702 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions.
[2020-08-21 15:05:52,703 INFO  L78                 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467
[2020-08-21 15:05:52,704 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:05:52,704 INFO  L479      AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions.
[2020-08-21 15:05:52,704 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 15:05:52,704 INFO  L276                IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions.
[2020-08-21 15:05:52,721 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 470
[2020-08-21 15:05:52,721 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:05:52,723 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]
[2020-08-21 15:05:52,728 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 15:05:52,728 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:05:52,728 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:05:52,729 INFO  L82        PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times
[2020-08-21 15:05:52,729 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:05:52,730 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118762633]
[2020-08-21 15:05:52,730 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:05:53,049 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:54,116 WARN  L193               SmtUtils]: Spent 795.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 15:05:54,120 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:05:54,128 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:54,523 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:05:54,523 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118762633]
[2020-08-21 15:05:54,523 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:05:54,524 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:05:54,524 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887887199]
[2020-08-21 15:05:54,526 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:05:54,526 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:05:54,526 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:05:54,527 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:05:54,527 INFO  L87              Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states.
[2020-08-21 15:06:10,932 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:10,933 INFO  L93              Difference]: Finished difference Result 11260 states and 18231 transitions.
[2020-08-21 15:06:10,934 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 15:06:10,935 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 469
[2020-08-21 15:06:10,936 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:10,972 INFO  L225             Difference]: With dead ends: 11260
[2020-08-21 15:06:10,973 INFO  L226             Difference]: Without dead ends: 7620
[2020-08-21 15:06:10,981 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:10,992 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7620 states.
[2020-08-21 15:06:11,236 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7620 to 7618.
[2020-08-21 15:06:11,237 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7618 states.
[2020-08-21 15:06:11,265 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7618 states to 7618 states and 12321 transitions.
[2020-08-21 15:06:11,265 INFO  L78                 Accepts]: Start accepts. Automaton has 7618 states and 12321 transitions. Word has length 469
[2020-08-21 15:06:11,266 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:11,266 INFO  L479      AbstractCegarLoop]: Abstraction has 7618 states and 12321 transitions.
[2020-08-21 15:06:11,266 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:11,266 INFO  L276                IsEmpty]: Start isEmpty. Operand 7618 states and 12321 transitions.
[2020-08-21 15:06:11,292 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 471
[2020-08-21 15:06:11,292 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:11,293 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]
[2020-08-21 15:06:11,293 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 15:06:11,293 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:11,294 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:11,294 INFO  L82        PathProgramCache]: Analyzing trace with hash -269242540, now seen corresponding path program 1 times
[2020-08-21 15:06:11,294 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:11,295 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542447536]
[2020-08-21 15:06:11,295 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:11,360 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:12,610 WARN  L193               SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 15:06:12,611 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:12,619 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:12,942 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:12,943 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542447536]
[2020-08-21 15:06:12,943 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:12,944 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:12,944 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326969289]
[2020-08-21 15:06:12,945 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:12,947 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:12,948 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:12,949 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:12,950 INFO  L87              Difference]: Start difference. First operand 7618 states and 12321 transitions. Second operand 4 states.