/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 enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 21:16:58,099 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 21:16:58,102 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 21:16:58,142 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 21:16:58,142 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 21:16:58,149 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 21:16:58,150 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 21:16:58,156 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 21:16:58,159 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 21:16:58,160 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 21:16:58,160 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 21:16:58,161 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 21:16:58,162 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 21:16:58,163 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 21:16:58,163 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 21:16:58,164 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 21:16:58,165 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 21:16:58,166 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 21:16:58,168 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 21:16:58,169 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 21:16:58,171 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 21:16:58,172 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 21:16:58,173 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 21:16:58,173 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 21:16:58,176 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 21:16:58,176 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 21:16:58,176 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 21:16:58,177 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 21:16:58,177 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 21:16:58,178 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 21:16:58,178 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 21:16:58,179 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 21:16:58,180 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 21:16:58,181 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 21:16:58,182 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 21:16:58,182 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 21:16:58,183 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 21:16:58,183 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 21:16:58,185 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 21:16:58,185 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
[2020-08-18 21:16:58,208 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 21:16:58,208 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 21:16:58,209 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 21:16:58,210 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 21:16:58,210 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 21:16:58,210 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 21:16:58,210 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 21:16:58,211 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 21:16:58,211 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 21:16:58,211 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 21:16:58,211 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 21:16:58,211 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 21:16:58,212 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 21:16:58,212 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 21:16:58,212 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 21:16:58,212 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 21:16:58,212 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 21:16:58,213 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 21:16:58,213 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 21:16:58,213 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 21:16:58,213 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 21:16:58,213 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 21:16:58,214 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 21:16:58,214 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 21:16:58,214 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 21:16:58,214 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 21:16:58,214 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 21:16:58,215 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 21:16:58,215 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 21:16:58,215 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 -> enumeration-timeout=5;interpolation-heuristic=DEEPEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST;
[2020-08-18 21:16:58,531 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 21:16:58,541 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 21:16:58,544 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 21:16:58,546 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 21:16:58,546 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 21:16:58,547 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 21:16:58,606 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/076a71355/328b253771da40a48aa31a1939725a4b/FLAG5e3e26250
[2020-08-18 21:16:59,185 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 21:16:59,186 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 21:16:59,209 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/076a71355/328b253771da40a48aa31a1939725a4b/FLAG5e3e26250
[2020-08-18 21:16:59,401 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/076a71355/328b253771da40a48aa31a1939725a4b
[2020-08-18 21:16:59,409 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 21:16:59,411 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 21:16:59,412 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 21:16:59,412 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 21:16:59,416 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 21:16:59,417 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:16:59" (1/1) ...
[2020-08-18 21:16:59,420 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33de124 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:16:59, skipping insertion in model container
[2020-08-18 21:16:59,420 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:16:59" (1/1) ...
[2020-08-18 21:16:59,428 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 21:16:59,546 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 21:17:00,623 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 21:17:00,637 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 21:17:01,128 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 21:17:01,149 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 21:17:01,150 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01 WrapperNode
[2020-08-18 21:17:01,150 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 21:17:01,151 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 21:17:01,151 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 21:17:01,151 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 21:17:01,166 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,167 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,190 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,191 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,246 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,282 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,306 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (1/1) ...
[2020-08-18 21:17:01,341 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 21:17:01,342 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 21:17:01,342 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 21:17:01,342 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 21:17:01,344 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (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
[2020-08-18 21:17:01,450 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 21:17:01,451 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 21:17:01,451 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 21:17:01,452 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 21:17:01,452 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 21:17:01,453 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 21:17:01,454 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 21:17:01,454 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 21:17:01,454 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 21:17:01,455 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 21:17:01,456 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 21:17:01,456 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 21:17:01,456 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 21:17:01,456 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 21:17:01,457 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 21:17:01,458 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 21:17:01,458 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 21:17:01,459 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 21:17:01,459 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 21:17:01,459 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 21:17:01,459 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 21:17:01,460 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 21:17:04,315 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 21:17:04,316 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 21:17:04,326 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:17:04 BoogieIcfgContainer
[2020-08-18 21:17:04,327 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 21:17:04,328 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 21:17:04,328 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 21:17:04,331 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 21:17:04,331 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:16:59" (1/3) ...
[2020-08-18 21:17:04,332 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c2558f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:17:04, skipping insertion in model container
[2020-08-18 21:17:04,332 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:17:01" (2/3) ...
[2020-08-18 21:17:04,333 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c2558f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:17:04, skipping insertion in model container
[2020-08-18 21:17:04,333 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:17:04" (3/3) ...
[2020-08-18 21:17:04,335 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 21:17:04,346 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 21:17:04,355 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 21:17:04,369 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 21:17:04,397 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 21:17:04,397 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 21:17:04,397 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 21:17:04,397 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 21:17:04,397 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 21:17:04,398 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 21:17:04,398 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 21:17:04,398 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 21:17:04,431 INFO  L276                IsEmpty]: Start isEmpty. Operand 789 states.
[2020-08-18 21:17:04,461 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 21:17:04,462 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:04,463 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]
[2020-08-18 21:17:04,464 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:04,470 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:04,470 INFO  L82        PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times
[2020-08-18 21:17:04,479 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:04,480 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503465498]
[2020-08-18 21:17:04,480 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:05,187 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:06,443 WARN  L193               SmtUtils]: Spent 676.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:06,446 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:06,460 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:06,723 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:06,725 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503465498]
[2020-08-18 21:17:06,728 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:06,729 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:06,730 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689881906]
[2020-08-18 21:17:06,742 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:06,742 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:06,765 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:06,767 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:06,770 INFO  L87              Difference]: Start difference. First operand 789 states. Second operand 4 states.
[2020-08-18 21:17:07,514 WARN  L193               SmtUtils]: Spent 607.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 21:17:12,539 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:12,539 INFO  L93              Difference]: Finished difference Result 1489 states and 2621 transitions.
[2020-08-18 21:17:12,540 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 21:17:12,541 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 21:17:12,543 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:12,568 INFO  L225             Difference]: With dead ends: 1489
[2020-08-18 21:17:12,569 INFO  L226             Difference]: Without dead ends: 1273
[2020-08-18 21:17:12,574 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 21:17:12,593 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1273 states.
[2020-08-18 21:17:12,711 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271.
[2020-08-18 21:17:12,713 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1271 states.
[2020-08-18 21:17:12,719 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions.
[2020-08-18 21:17:12,722 INFO  L78                 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326
[2020-08-18 21:17:12,724 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:12,724 INFO  L479      AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions.
[2020-08-18 21:17:12,724 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 21:17:12,724 INFO  L276                IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions.
[2020-08-18 21:17:12,734 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 21:17:12,735 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:12,735 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]
[2020-08-18 21:17:12,736 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 21:17:12,736 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:12,736 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:12,737 INFO  L82        PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times
[2020-08-18 21:17:12,737 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:12,737 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841625132]
[2020-08-18 21:17:12,737 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:13,010 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:13,804 WARN  L193               SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:13,806 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:13,814 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:14,149 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:14,149 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841625132]
[2020-08-18 21:17:14,150 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:14,150 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:14,151 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401942167]
[2020-08-18 21:17:14,153 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:14,153 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:14,154 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:14,154 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:14,155 INFO  L87              Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states.
[2020-08-18 21:17:14,763 WARN  L193               SmtUtils]: Spent 548.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 21:17:18,992 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:18,992 INFO  L93              Difference]: Finished difference Result 2607 states and 4089 transitions.
[2020-08-18 21:17:18,994 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 21:17:18,994 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 21:17:18,996 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:19,009 INFO  L225             Difference]: With dead ends: 2607
[2020-08-18 21:17:19,010 INFO  L226             Difference]: Without dead ends: 2225
[2020-08-18 21:17:19,018 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 21:17:19,022 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2225 states.
[2020-08-18 21:17:19,098 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223.
[2020-08-18 21:17:19,098 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2223 states.
[2020-08-18 21:17:19,108 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions.
[2020-08-18 21:17:19,108 INFO  L78                 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326
[2020-08-18 21:17:19,109 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:19,109 INFO  L479      AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions.
[2020-08-18 21:17:19,110 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 21:17:19,110 INFO  L276                IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions.
[2020-08-18 21:17:19,118 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 21:17:19,118 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:19,119 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]
[2020-08-18 21:17:19,119 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 21:17:19,120 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:19,120 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:19,120 INFO  L82        PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times
[2020-08-18 21:17:19,121 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:19,121 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496398908]
[2020-08-18 21:17:19,121 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:19,293 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:20,030 WARN  L193               SmtUtils]: Spent 550.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:20,032 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:20,040 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:20,256 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:20,256 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496398908]
[2020-08-18 21:17:20,257 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:20,258 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:20,258 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863464664]
[2020-08-18 21:17:20,259 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:20,259 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:20,259 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:20,261 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:20,261 INFO  L87              Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states.
[2020-08-18 21:17:20,697 WARN  L193               SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 21:17:24,720 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:24,720 INFO  L93              Difference]: Finished difference Result 4715 states and 7386 transitions.
[2020-08-18 21:17:24,727 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 21:17:24,727 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 21:17:24,728 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:24,748 INFO  L225             Difference]: With dead ends: 4715
[2020-08-18 21:17:24,749 INFO  L226             Difference]: Without dead ends: 4049
[2020-08-18 21:17:24,752 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 21:17:24,759 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4049 states.
[2020-08-18 21:17:24,919 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047.
[2020-08-18 21:17:24,920 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4047 states.
[2020-08-18 21:17:24,934 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions.
[2020-08-18 21:17:24,934 INFO  L78                 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326
[2020-08-18 21:17:24,935 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:24,935 INFO  L479      AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions.
[2020-08-18 21:17:24,936 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 21:17:24,936 INFO  L276                IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions.
[2020-08-18 21:17:24,946 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 21:17:24,946 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:24,946 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]
[2020-08-18 21:17:24,947 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 21:17:24,947 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:24,947 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:24,948 INFO  L82        PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times
[2020-08-18 21:17:24,948 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:24,948 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006087466]
[2020-08-18 21:17:24,948 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:25,332 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:25,882 WARN  L193               SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:25,884 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:25,890 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:26,050 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:26,051 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006087466]
[2020-08-18 21:17:26,051 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:26,051 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 21:17:26,051 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337059262]
[2020-08-18 21:17:26,052 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 21:17:26,052 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:26,052 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 21:17:26,053 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 21:17:26,053 INFO  L87              Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states.
[2020-08-18 21:17:32,643 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:32,643 INFO  L93              Difference]: Finished difference Result 11998 states and 18565 transitions.
[2020-08-18 21:17:32,644 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 21:17:32,644 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 326
[2020-08-18 21:17:32,644 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:32,680 INFO  L225             Difference]: With dead ends: 11998
[2020-08-18 21:17:32,680 INFO  L226             Difference]: Without dead ends: 7966
[2020-08-18 21:17:32,689 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 21:17:32,697 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7966 states.
[2020-08-18 21:17:32,972 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964.
[2020-08-18 21:17:32,973 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7964 states.
[2020-08-18 21:17:32,997 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions.
[2020-08-18 21:17:32,998 INFO  L78                 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326
[2020-08-18 21:17:32,998 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:32,998 INFO  L479      AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions.
[2020-08-18 21:17:32,999 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 21:17:32,999 INFO  L276                IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions.
[2020-08-18 21:17:33,017 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 21:17:33,017 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:33,017 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]
[2020-08-18 21:17:33,018 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 21:17:33,018 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:33,018 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:33,019 INFO  L82        PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times
[2020-08-18 21:17:33,019 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:33,019 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918529793]
[2020-08-18 21:17:33,019 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:33,185 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:33,699 WARN  L193               SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:33,701 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:33,707 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:33,829 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:33,829 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918529793]
[2020-08-18 21:17:33,829 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:33,829 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:33,829 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180627145]
[2020-08-18 21:17:33,830 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:33,830 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:33,831 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:33,831 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:33,831 INFO  L87              Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states.
[2020-08-18 21:17:41,540 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:41,541 INFO  L93              Difference]: Finished difference Result 23441 states and 36046 transitions.
[2020-08-18 21:17:41,541 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 21:17:41,542 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 21:17:41,542 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:41,598 INFO  L225             Difference]: With dead ends: 23441
[2020-08-18 21:17:41,598 INFO  L226             Difference]: Without dead ends: 15606
[2020-08-18 21:17:41,616 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:41,632 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15606 states.
[2020-08-18 21:17:42,101 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604.
[2020-08-18 21:17:42,101 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15604 states.
[2020-08-18 21:17:42,128 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions.
[2020-08-18 21:17:42,129 INFO  L78                 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328
[2020-08-18 21:17:42,129 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:42,129 INFO  L479      AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions.
[2020-08-18 21:17:42,129 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 21:17:42,129 INFO  L276                IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions.
[2020-08-18 21:17:42,157 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 21:17:42,158 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:42,158 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]
[2020-08-18 21:17:42,158 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 21:17:42,158 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:42,159 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:42,162 INFO  L82        PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times
[2020-08-18 21:17:42,162 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:42,162 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964284785]
[2020-08-18 21:17:42,163 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:42,204 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:42,819 WARN  L193               SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:42,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:42,825 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:42,920 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:42,920 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964284785]
[2020-08-18 21:17:42,921 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:42,921 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:42,921 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284052575]
[2020-08-18 21:17:42,922 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:42,922 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:42,922 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:42,923 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:42,923 INFO  L87              Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states.
[2020-08-18 21:17:51,524 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 21:17:51,525 INFO  L93              Difference]: Finished difference Result 46737 states and 71555 transitions.
[2020-08-18 21:17:51,525 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 21:17:51,525 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 21:17:51,525 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 21:17:51,589 INFO  L225             Difference]: With dead ends: 46737
[2020-08-18 21:17:51,589 INFO  L226             Difference]: Without dead ends: 31175
[2020-08-18 21:17:51,627 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:51,666 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31175 states.
[2020-08-18 21:17:52,405 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623.
[2020-08-18 21:17:52,405 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15623 states.
[2020-08-18 21:17:52,432 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions.
[2020-08-18 21:17:52,432 INFO  L78                 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328
[2020-08-18 21:17:52,433 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 21:17:52,433 INFO  L479      AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions.
[2020-08-18 21:17:52,433 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 21:17:52,434 INFO  L276                IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions.
[2020-08-18 21:17:52,457 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 330
[2020-08-18 21:17:52,457 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 21:17:52,457 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]
[2020-08-18 21:17:52,458 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 21:17:52,458 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 21:17:52,458 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 21:17:52,458 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times
[2020-08-18 21:17:52,459 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 21:17:52,459 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166665133]
[2020-08-18 21:17:52,459 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 21:17:52,502 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:53,022 WARN  L193               SmtUtils]: Spent 436.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 21:17:53,024 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 21:17:53,032 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 21:17:53,847 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 21:17:53,848 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166665133]
[2020-08-18 21:17:53,849 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 21:17:53,849 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 21:17:53,849 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859823001]
[2020-08-18 21:17:53,850 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 21:17:53,850 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 21:17:53,851 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 21:17:53,851 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 21:17:53,851 INFO  L87              Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.