/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=LOWLEXORDER -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 18:51:56,477 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 18:51:56,483 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 18:51:56,524 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 18:51:56,524 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 18:51:56,533 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 18:51:56,535 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 18:51:56,537 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 18:51:56,541 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 18:51:56,542 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 18:51:56,545 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 18:51:56,547 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 18:51:56,547 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 18:51:56,550 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 18:51:56,552 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 18:51:56,553 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 18:51:56,555 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 18:51:56,556 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 18:51:56,558 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 18:51:56,566 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 18:51:56,568 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 18:51:56,569 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 18:51:56,570 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 18:51:56,571 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 18:51:56,584 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 18:51:56,584 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 18:51:56,584 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 18:51:56,585 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 18:51:56,586 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 18:51:56,590 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 18:51:56,591 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 18:51:56,592 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 18:51:56,592 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 18:51:56,597 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 18:51:56,598 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 18:51:56,598 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 18:51:56,599 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 18:51:56,599 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 18:51:56,599 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 18:51:56,600 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 18:51:56,600 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 18:51:56,601 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 18:51:56,623 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 18:51:56,623 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 18:51:56,625 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 18:51:56,625 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 18:51:56,625 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 18:51:56,625 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 18:51:56,625 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 18:51:56,626 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 18:51:56,626 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 18:51:56,626 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 18:51:56,626 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 18:51:56,626 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 18:51:56,627 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 18:51:56,627 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 18:51:56,627 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 18:51:56,627 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 18:51:56,627 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 18:51:56,628 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 18:51:56,628 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 18:51:56,628 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 18:51:56,628 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 18:51:56,628 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 18:51:56,629 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 18:51:56,629 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 18:51:56,629 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 18:51:56,629 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 18:51:56,629 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 18:51:56,630 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 18:51:56,630 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 18:51:56,630 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=LOWLEXORDER;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER;
[2020-08-18 18:51:56,911 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 18:51:56,923 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 18:51:56,927 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 18:51:56,928 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 18:51:56,929 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 18:51:56,930 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 18:51:56,993 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ea32eef7b/ba34b0e942c84befb4f417b6925e71b5/FLAGa2196c538
[2020-08-18 18:51:57,660 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 18:51:57,662 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 18:51:57,685 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ea32eef7b/ba34b0e942c84befb4f417b6925e71b5/FLAGa2196c538
[2020-08-18 18:51:57,815 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ea32eef7b/ba34b0e942c84befb4f417b6925e71b5
[2020-08-18 18:51:57,825 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 18:51:57,827 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 18:51:57,828 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 18:51:57,828 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 18:51:57,833 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 18:51:57,834 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:51:57" (1/1) ...
[2020-08-18 18:51:57,837 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bc1f18c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:57, skipping insertion in model container
[2020-08-18 18:51:57,838 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:51:57" (1/1) ...
[2020-08-18 18:51:57,846 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 18:51:57,948 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 18:51:59,057 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:51:59,069 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 18:51:59,527 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:51:59,558 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 18:51:59,559 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59 WrapperNode
[2020-08-18 18:51:59,560 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 18:51:59,560 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 18:51:59,561 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 18:51:59,561 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 18:51:59,577 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,580 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,639 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,640 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,725 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,761 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,770 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (1/1) ...
[2020-08-18 18:51:59,783 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 18:51:59,783 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 18:51:59,784 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 18:51:59,784 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 18:51:59,785 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (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 18:51:59,877 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 18:51:59,878 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 18:51:59,878 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 18:51:59,879 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 18:51:59,879 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 18:51:59,879 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 18:51:59,879 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 18:51:59,880 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 18:51:59,881 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 18:51:59,881 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 18:51:59,881 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 18:51:59,882 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 18:51:59,882 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 18:51:59,882 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 18:51:59,883 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 18:51:59,883 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 18:51:59,883 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 18:52:02,648 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 18:52:02,649 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 18:52:02,667 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:52:02 BoogieIcfgContainer
[2020-08-18 18:52:02,667 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 18:52:02,671 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 18:52:02,671 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 18:52:02,674 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 18:52:02,675 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:51:57" (1/3) ...
[2020-08-18 18:52:02,676 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c0b7390 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:52:02, skipping insertion in model container
[2020-08-18 18:52:02,676 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:51:59" (2/3) ...
[2020-08-18 18:52:02,677 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c0b7390 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:52:02, skipping insertion in model container
[2020-08-18 18:52:02,677 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:52:02" (3/3) ...
[2020-08-18 18:52:02,679 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 18:52:02,692 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 18:52:02,706 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 18:52:02,722 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 18:52:02,759 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 18:52:02,759 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 18:52:02,759 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 18:52:02,760 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 18:52:02,760 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 18:52:02,760 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 18:52:02,760 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 18:52:02,760 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 18:52:02,798 INFO  L276                IsEmpty]: Start isEmpty. Operand 789 states.
[2020-08-18 18:52:02,840 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 18:52:02,840 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:02,842 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 18:52:02,843 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:02,849 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:02,850 INFO  L82        PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times
[2020-08-18 18:52:02,860 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:02,860 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804665711]
[2020-08-18 18:52:02,861 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:03,654 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:04,564 WARN  L193               SmtUtils]: Spent 531.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:04,566 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:04,574 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:04,764 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 18:52:04,765 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804665711]
[2020-08-18 18:52:04,767 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:04,767 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:04,768 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651254259]
[2020-08-18 18:52:04,774 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:04,775 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:04,788 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:04,789 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:04,792 INFO  L87              Difference]: Start difference. First operand 789 states. Second operand 4 states.
[2020-08-18 18:52:05,278 WARN  L193               SmtUtils]: Spent 412.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 18:52:10,283 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:10,284 INFO  L93              Difference]: Finished difference Result 1489 states and 2621 transitions.
[2020-08-18 18:52:10,285 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 18:52:10,287 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 18:52:10,289 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:10,316 INFO  L225             Difference]: With dead ends: 1489
[2020-08-18 18:52:10,316 INFO  L226             Difference]: Without dead ends: 1273
[2020-08-18 18:52:10,322 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 18:52:10,345 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1273 states.
[2020-08-18 18:52:10,474 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271.
[2020-08-18 18:52:10,475 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1271 states.
[2020-08-18 18:52:10,482 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions.
[2020-08-18 18:52:10,485 INFO  L78                 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326
[2020-08-18 18:52:10,491 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:10,491 INFO  L479      AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions.
[2020-08-18 18:52:10,492 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:52:10,492 INFO  L276                IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions.
[2020-08-18 18:52:10,502 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 18:52:10,502 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:10,503 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 18:52:10,503 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 18:52:10,504 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:10,504 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:10,504 INFO  L82        PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times
[2020-08-18 18:52:10,505 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:10,505 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585508368]
[2020-08-18 18:52:10,505 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:10,794 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:11,691 WARN  L193               SmtUtils]: Spent 639.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:11,694 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:11,704 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:11,990 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 18:52:11,990 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585508368]
[2020-08-18 18:52:11,991 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:11,991 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:11,992 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367883497]
[2020-08-18 18:52:11,996 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:11,996 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:11,997 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:11,997 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:11,998 INFO  L87              Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states.
[2020-08-18 18:52:12,558 WARN  L193               SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 18:52:16,799 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:16,800 INFO  L93              Difference]: Finished difference Result 2607 states and 4089 transitions.
[2020-08-18 18:52:16,800 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 18:52:16,801 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 18:52:16,806 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:16,827 INFO  L225             Difference]: With dead ends: 2607
[2020-08-18 18:52:16,830 INFO  L226             Difference]: Without dead ends: 2225
[2020-08-18 18:52:16,845 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 18:52:16,851 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2225 states.
[2020-08-18 18:52:16,964 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223.
[2020-08-18 18:52:16,966 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2223 states.
[2020-08-18 18:52:16,984 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions.
[2020-08-18 18:52:16,985 INFO  L78                 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326
[2020-08-18 18:52:16,986 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:16,986 INFO  L479      AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions.
[2020-08-18 18:52:16,986 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:52:16,987 INFO  L276                IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions.
[2020-08-18 18:52:17,002 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 18:52:17,003 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:17,008 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 18:52:17,008 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 18:52:17,009 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:17,009 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:17,009 INFO  L82        PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times
[2020-08-18 18:52:17,010 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:17,010 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655153502]
[2020-08-18 18:52:17,012 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:17,346 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:18,252 WARN  L193               SmtUtils]: Spent 603.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:18,254 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:18,265 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:18,535 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 18:52:18,536 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655153502]
[2020-08-18 18:52:18,537 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:18,537 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:18,538 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420787963]
[2020-08-18 18:52:18,539 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:18,539 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:18,539 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:18,540 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:18,541 INFO  L87              Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states.
[2020-08-18 18:52:19,041 WARN  L193               SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 18:52:23,001 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:23,001 INFO  L93              Difference]: Finished difference Result 4715 states and 7386 transitions.
[2020-08-18 18:52:23,001 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 18:52:23,001 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 18:52:23,003 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:23,022 INFO  L225             Difference]: With dead ends: 4715
[2020-08-18 18:52:23,022 INFO  L226             Difference]: Without dead ends: 4049
[2020-08-18 18:52:23,025 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 18:52:23,031 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4049 states.
[2020-08-18 18:52:23,153 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047.
[2020-08-18 18:52:23,154 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4047 states.
[2020-08-18 18:52:23,168 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions.
[2020-08-18 18:52:23,168 INFO  L78                 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326
[2020-08-18 18:52:23,169 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:23,169 INFO  L479      AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions.
[2020-08-18 18:52:23,169 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:52:23,169 INFO  L276                IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions.
[2020-08-18 18:52:23,179 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 18:52:23,180 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:23,180 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 18:52:23,181 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 18:52:23,181 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:23,181 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:23,182 INFO  L82        PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times
[2020-08-18 18:52:23,182 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:23,182 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455204561]
[2020-08-18 18:52:23,183 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:23,542 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:24,113 WARN  L193               SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:24,115 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:24,121 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:24,352 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 18:52:24,352 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455204561]
[2020-08-18 18:52:24,353 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:24,354 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 18:52:24,354 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489901213]
[2020-08-18 18:52:24,355 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 18:52:24,355 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:24,355 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 18:52:24,356 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 18:52:24,356 INFO  L87              Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states.
[2020-08-18 18:52:31,330 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:31,330 INFO  L93              Difference]: Finished difference Result 11998 states and 18565 transitions.
[2020-08-18 18:52:31,331 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 18:52:31,331 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 326
[2020-08-18 18:52:31,332 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:31,369 INFO  L225             Difference]: With dead ends: 11998
[2020-08-18 18:52:31,369 INFO  L226             Difference]: Without dead ends: 7966
[2020-08-18 18:52:31,379 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 18:52:31,389 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7966 states.
[2020-08-18 18:52:31,766 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964.
[2020-08-18 18:52:31,766 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7964 states.
[2020-08-18 18:52:31,794 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions.
[2020-08-18 18:52:31,794 INFO  L78                 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326
[2020-08-18 18:52:31,795 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:31,795 INFO  L479      AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions.
[2020-08-18 18:52:31,795 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 18:52:31,795 INFO  L276                IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions.
[2020-08-18 18:52:31,814 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 18:52:31,814 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:31,815 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 18:52:31,815 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 18:52:31,815 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:31,816 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:31,816 INFO  L82        PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times
[2020-08-18 18:52:31,816 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:31,816 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898817555]
[2020-08-18 18:52:31,817 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:31,920 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:32,468 WARN  L193               SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:32,469 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:32,476 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:32,597 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 18:52:32,598 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898817555]
[2020-08-18 18:52:32,598 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:32,598 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:32,598 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354083619]
[2020-08-18 18:52:32,599 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:32,599 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:32,600 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:32,600 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:32,600 INFO  L87              Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states.
[2020-08-18 18:52:40,267 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:40,268 INFO  L93              Difference]: Finished difference Result 23441 states and 36046 transitions.
[2020-08-18 18:52:40,268 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 18:52:40,269 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 18:52:40,269 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:40,333 INFO  L225             Difference]: With dead ends: 23441
[2020-08-18 18:52:40,333 INFO  L226             Difference]: Without dead ends: 15606
[2020-08-18 18:52:40,351 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:40,368 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15606 states.
[2020-08-18 18:52:40,819 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604.
[2020-08-18 18:52:40,820 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15604 states.
[2020-08-18 18:52:40,846 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions.
[2020-08-18 18:52:40,846 INFO  L78                 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328
[2020-08-18 18:52:40,847 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:40,847 INFO  L479      AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions.
[2020-08-18 18:52:40,847 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:52:40,847 INFO  L276                IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions.
[2020-08-18 18:52:40,878 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 18:52:40,878 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:40,879 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 18:52:40,879 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 18:52:40,880 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:40,884 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:40,885 INFO  L82        PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times
[2020-08-18 18:52:40,885 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:40,886 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546122385]
[2020-08-18 18:52:40,886 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:41,028 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:41,456 WARN  L193               SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:41,457 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:41,462 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:41,550 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 18:52:41,550 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546122385]
[2020-08-18 18:52:41,551 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:41,551 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:41,551 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994772915]
[2020-08-18 18:52:41,552 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:41,552 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:41,552 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:41,553 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:41,553 INFO  L87              Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states.
[2020-08-18 18:52:49,633 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:49,634 INFO  L93              Difference]: Finished difference Result 46737 states and 71555 transitions.
[2020-08-18 18:52:49,634 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 18:52:49,635 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 18:52:49,635 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:49,701 INFO  L225             Difference]: With dead ends: 46737
[2020-08-18 18:52:49,702 INFO  L226             Difference]: Without dead ends: 31175
[2020-08-18 18:52:49,731 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 18:52:49,765 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31175 states.
[2020-08-18 18:52:50,466 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623.
[2020-08-18 18:52:50,466 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15623 states.
[2020-08-18 18:52:50,492 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions.
[2020-08-18 18:52:50,493 INFO  L78                 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328
[2020-08-18 18:52:50,493 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:50,493 INFO  L479      AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions.
[2020-08-18 18:52:50,494 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:52:50,494 INFO  L276                IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions.
[2020-08-18 18:52:50,519 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 330
[2020-08-18 18:52:50,519 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:50,519 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 18:52:50,520 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 18:52:50,520 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:50,520 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:50,520 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times
[2020-08-18 18:52:50,521 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:50,521 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81014651]
[2020-08-18 18:52:50,521 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:50,556 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:51,137 WARN  L193               SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 18:52:51,138 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:51,146 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:51,231 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 18:52:51,232 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81014651]
[2020-08-18 18:52:51,233 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:51,233 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:51,233 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891296112]
[2020-08-18 18:52:51,234 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:51,234 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:51,234 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:51,235 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:51,235 INFO  L87              Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.