/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 15:05:48,649 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 15:05:48,652 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 15:05:48,673 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 15:05:48,674 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 15:05:48,675 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 15:05:48,676 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 15:05:48,678 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 15:05:48,679 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 15:05:48,680 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 15:05:48,681 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 15:05:48,682 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 15:05:48,683 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 15:05:48,683 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 15:05:48,684 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 15:05:48,686 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 15:05:48,686 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 15:05:48,687 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 15:05:48,689 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 15:05:48,690 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 15:05:48,692 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 15:05:48,693 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 15:05:48,694 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 15:05:48,694 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 15:05:48,697 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 15:05:48,697 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 15:05:48,697 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 15:05:48,698 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 15:05:48,699 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 15:05:48,699 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 15:05:48,700 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 15:05:48,700 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 15:05:48,701 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 15:05:48,702 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 15:05:48,703 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 15:05:48,703 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 15:05:48,704 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 15:05:48,704 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 15:05:48,704 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 15:05:48,705 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 15:05:48,706 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 15:05:48,706 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-21 15:05:48,733 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 15:05:48,734 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 15:05:48,735 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 15:05:48,735 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 15:05:48,735 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 15:05:48,736 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 15:05:48,740 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 15:05:48,740 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 15:05:48,740 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 15:05:48,740 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 15:05:48,741 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 15:05:48,741 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 15:05:48,741 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 15:05:48,741 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 15:05:48,741 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 15:05:48,742 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 15:05:48,742 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 15:05:48,742 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 15:05:48,742 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 15:05:48,742 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 15:05:48,743 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 15:05:48,745 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 15:05:48,745 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 15:05:48,745 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 15:05:48,746 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 15:05:48,746 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 15:05:48,746 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 15:05:48,746 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 15:05:48,746 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 15:05:48,747 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true;
[2020-08-21 15:05:49,087 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 15:05:49,107 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 15:05:49,110 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 15:05:49,112 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 15:05:49,113 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 15:05:49,115 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:49,185 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/089da2462/8d874bc2fdbf4c5dbbd9b172eddc9053/FLAGcc1b9a3e7
[2020-08-21 15:05:49,825 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 15:05:49,825 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:49,851 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/089da2462/8d874bc2fdbf4c5dbbd9b172eddc9053/FLAGcc1b9a3e7
[2020-08-21 15:05:50,013 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/089da2462/8d874bc2fdbf4c5dbbd9b172eddc9053
[2020-08-21 15:05:50,022 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 15:05:50,024 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 15:05:50,027 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:50,028 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 15:05:50,031 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 15:05:50,033 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:50" (1/1) ...
[2020-08-21 15:05:50,036 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35e0de70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:50, skipping insertion in model container
[2020-08-21 15:05:50,037 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:50" (1/1) ...
[2020-08-21 15:05:50,043 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 15:05:50,146 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 15:05:51,248 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:51,260 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 15:05:51,692 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:51,722 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 15:05:51,723 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51 WrapperNode
[2020-08-21 15:05:51,723 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:51,724 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 15:05:51,725 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 15:05:51,725 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 15:05:51,744 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,745 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,771 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,772 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,835 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,858 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,866 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
[2020-08-21 15:05:51,878 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 15:05:51,879 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 15:05:51,879 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 15:05:51,879 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 15:05:51,884 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 15:05:51,968 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 15:05:51,969 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 15:05:51,969 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 15:05:51,969 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 15:05:51,970 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 15:05:51,970 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 15:05:51,971 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 15:05:51,972 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 15:05:51,972 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 15:05:51,972 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 15:05:51,974 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 15:05:51,974 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 15:05:51,975 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 15:05:51,975 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 15:05:51,975 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 15:05:51,976 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 15:05:51,977 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 15:05:51,977 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 15:05:51,977 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 15:05:51,977 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 15:05:51,977 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 15:05:51,978 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 15:05:54,746 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 15:05:54,747 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 15:05:54,764 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:05:54 BoogieIcfgContainer
[2020-08-21 15:05:54,764 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 15:05:54,766 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 15:05:54,768 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 15:05:54,771 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 15:05:54,771 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:05:50" (1/3) ...
[2020-08-21 15:05:54,774 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11cdbf8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:05:54, skipping insertion in model container
[2020-08-21 15:05:54,774 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:51" (2/3) ...
[2020-08-21 15:05:54,775 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11cdbf8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:05:54, skipping insertion in model container
[2020-08-21 15:05:54,775 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:05:54" (3/3) ...
[2020-08-21 15:05:54,778 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:54,787 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 15:05:54,796 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 15:05:54,810 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 15:05:54,837 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 15:05:54,837 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 15:05:54,838 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 15:05:54,838 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 15:05:54,838 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 15:05:54,838 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 15:05:54,838 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 15:05:54,838 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 15:05:54,872 INFO  L276                IsEmpty]: Start isEmpty. Operand 796 states.
[2020-08-21 15:05:54,902 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 15:05:54,902 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:05:54,904 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]
[2020-08-21 15:05:54,904 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:05:54,911 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:05:54,911 INFO  L82        PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times
[2020-08-21 15:05:54,920 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:05:54,921 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374264939]
[2020-08-21 15:05:54,921 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:05:55,657 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:56,667 WARN  L193               SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:05:56,670 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:05:56,691 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:05:56,857 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:05:56,858 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374264939]
[2020-08-21 15:05:56,860 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:05:56,861 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:05:56,862 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756575619]
[2020-08-21 15:05:56,867 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:05:56,868 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:05:56,882 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:05:56,883 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:05:56,885 INFO  L87              Difference]: Start difference. First operand 796 states. Second operand 4 states.
[2020-08-21 15:05:57,449 WARN  L193               SmtUtils]: Spent 470.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:02,660 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:02,661 INFO  L93              Difference]: Finished difference Result 1515 states and 2659 transitions.
[2020-08-21 15:06:02,662 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:02,663 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 15:06:02,665 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:02,690 INFO  L225             Difference]: With dead ends: 1515
[2020-08-21 15:06:02,691 INFO  L226             Difference]: Without dead ends: 1299
[2020-08-21 15:06:02,696 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
[2020-08-21 15:06:02,718 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1299 states.
[2020-08-21 15:06:02,855 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297.
[2020-08-21 15:06:02,857 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1297 states.
[2020-08-21 15:06:02,864 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions.
[2020-08-21 15:06:02,866 INFO  L78                 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318
[2020-08-21 15:06:02,868 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:02,868 INFO  L479      AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions.
[2020-08-21 15:06:02,868 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:02,868 INFO  L276                IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions.
[2020-08-21 15:06:02,874 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 15:06:02,874 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:02,875 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]
[2020-08-21 15:06:02,875 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 15:06:02,875 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:02,876 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:02,876 INFO  L82        PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times
[2020-08-21 15:06:02,876 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:02,877 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631242512]
[2020-08-21 15:06:02,877 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:03,066 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:04,173 WARN  L193               SmtUtils]: Spent 850.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:04,174 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:04,183 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:04,431 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:04,432 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631242512]
[2020-08-21 15:06:04,433 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:04,433 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:04,433 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105599095]
[2020-08-21 15:06:04,438 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:04,439 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:04,439 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:04,439 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:04,439 INFO  L87              Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states.
[2020-08-21 15:06:05,009 WARN  L193               SmtUtils]: Spent 505.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:09,712 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:09,712 INFO  L93              Difference]: Finished difference Result 2671 states and 4201 transitions.
[2020-08-21 15:06:09,713 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:09,713 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 15:06:09,715 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:09,732 INFO  L225             Difference]: With dead ends: 2671
[2020-08-21 15:06:09,733 INFO  L226             Difference]: Without dead ends: 2289
[2020-08-21 15:06:09,743 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
[2020-08-21 15:06:09,749 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2289 states.
[2020-08-21 15:06:09,854 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287.
[2020-08-21 15:06:09,856 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2287 states.
[2020-08-21 15:06:09,873 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions.
[2020-08-21 15:06:09,873 INFO  L78                 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318
[2020-08-21 15:06:09,876 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:09,876 INFO  L479      AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions.
[2020-08-21 15:06:09,876 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:09,876 INFO  L276                IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions.
[2020-08-21 15:06:09,885 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 15:06:09,886 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:09,890 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:09,890 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 15:06:09,890 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:09,891 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:09,891 INFO  L82        PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times
[2020-08-21 15:06:09,892 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:09,892 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223546466]
[2020-08-21 15:06:09,893 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:10,169 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:10,936 WARN  L193               SmtUtils]: Spent 521.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:10,937 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:10,943 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:11,066 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:11,066 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223546466]
[2020-08-21 15:06:11,067 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:11,067 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:11,067 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481432504]
[2020-08-21 15:06:11,068 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:11,068 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:11,069 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:11,069 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:11,069 INFO  L87              Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states.
[2020-08-21 15:06:11,634 WARN  L193               SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:15,754 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:15,754 INFO  L93              Difference]: Finished difference Result 4943 states and 7762 transitions.
[2020-08-21 15:06:15,756 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:15,756 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 15:06:15,757 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:15,778 INFO  L225             Difference]: With dead ends: 4943
[2020-08-21 15:06:15,778 INFO  L226             Difference]: Without dead ends: 4229
[2020-08-21 15:06:15,782 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
[2020-08-21 15:06:15,787 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4229 states.
[2020-08-21 15:06:15,903 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227.
[2020-08-21 15:06:15,903 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4227 states.
[2020-08-21 15:06:15,918 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions.
[2020-08-21 15:06:15,919 INFO  L78                 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318
[2020-08-21 15:06:15,919 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:15,920 INFO  L479      AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions.
[2020-08-21 15:06:15,920 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:15,920 INFO  L276                IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions.
[2020-08-21 15:06:15,930 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 15:06:15,930 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:15,931 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]
[2020-08-21 15:06:15,931 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 15:06:15,931 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:15,931 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:15,932 INFO  L82        PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times
[2020-08-21 15:06:15,932 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:15,933 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949547774]
[2020-08-21 15:06:15,933 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:16,139 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:16,763 WARN  L193               SmtUtils]: Spent 444.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:16,764 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:16,777 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:16,922 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:16,923 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949547774]
[2020-08-21 15:06:16,923 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:16,923 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:16,923 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363667960]
[2020-08-21 15:06:16,924 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:16,924 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:16,925 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:16,925 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:16,925 INFO  L87              Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states.
[2020-08-21 15:06:17,424 WARN  L193               SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:21,478 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:21,478 INFO  L93              Difference]: Finished difference Result 9359 states and 14670 transitions.
[2020-08-21 15:06:21,479 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:21,479 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 15:06:21,480 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:21,520 INFO  L225             Difference]: With dead ends: 9359
[2020-08-21 15:06:21,521 INFO  L226             Difference]: Without dead ends: 8029
[2020-08-21 15:06:21,527 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
[2020-08-21 15:06:21,536 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8029 states.
[2020-08-21 15:06:21,731 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027.
[2020-08-21 15:06:21,732 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8027 states.
[2020-08-21 15:06:21,768 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions.
[2020-08-21 15:06:21,769 INFO  L78                 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318
[2020-08-21 15:06:21,769 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:21,769 INFO  L479      AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions.
[2020-08-21 15:06:21,770 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:21,770 INFO  L276                IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions.
[2020-08-21 15:06:21,795 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 15:06:21,796 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:21,796 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]
[2020-08-21 15:06:21,796 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 15:06:21,797 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:21,797 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:21,797 INFO  L82        PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times
[2020-08-21 15:06:21,798 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:21,798 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1675008465]
[2020-08-21 15:06:21,798 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:22,227 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:22,887 WARN  L193               SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:22,889 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:22,895 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:23,025 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:23,026 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1675008465]
[2020-08-21 15:06:23,026 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:23,026 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 15:06:23,027 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146789377]
[2020-08-21 15:06:23,027 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 15:06:23,028 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:23,028 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 15:06:23,028 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 15:06:23,028 INFO  L87              Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states.
[2020-08-21 15:06:30,140 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:30,141 INFO  L93              Difference]: Finished difference Result 23754 states and 36777 transitions.
[2020-08-21 15:06:30,141 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:30,142 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 318
[2020-08-21 15:06:30,142 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:30,217 INFO  L225             Difference]: With dead ends: 23754
[2020-08-21 15:06:30,217 INFO  L226             Difference]: Without dead ends: 15742
[2020-08-21 15:06:30,236 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 15:06:30,253 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15742 states.
[2020-08-21 15:06:30,738 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740.
[2020-08-21 15:06:30,738 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15740 states.
[2020-08-21 15:06:30,768 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions.
[2020-08-21 15:06:30,768 INFO  L78                 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318
[2020-08-21 15:06:30,769 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:30,769 INFO  L479      AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions.
[2020-08-21 15:06:30,769 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 15:06:30,769 INFO  L276                IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions.
[2020-08-21 15:06:30,798 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-21 15:06:30,799 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:30,799 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]
[2020-08-21 15:06:30,799 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 15:06:30,800 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:30,800 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:30,800 INFO  L82        PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times
[2020-08-21 15:06:30,800 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:30,801 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864483013]
[2020-08-21 15:06:30,801 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:31,037 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:31,614 WARN  L193               SmtUtils]: Spent 445.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:31,615 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:31,620 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:31,749 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:31,750 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864483013]
[2020-08-21 15:06:31,750 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:31,750 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:31,751 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047516290]
[2020-08-21 15:06:31,751 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:31,752 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:31,752 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:31,752 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:31,752 INFO  L87              Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states.
[2020-08-21 15:06:40,319 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:40,319 INFO  L93              Difference]: Finished difference Result 46481 states and 71518 transitions.
[2020-08-21 15:06:40,320 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 15:06:40,321 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 320
[2020-08-21 15:06:40,321 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:40,396 INFO  L225             Difference]: With dead ends: 46481
[2020-08-21 15:06:40,396 INFO  L226             Difference]: Without dead ends: 30870
[2020-08-21 15:06:40,435 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
[2020-08-21 15:06:40,478 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30870 states.
[2020-08-21 15:06:42,201 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30870 to 30868.
[2020-08-21 15:06:42,202 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30868 states.
[2020-08-21 15:06:42,256 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30868 states to 30868 states and 47285 transitions.
[2020-08-21 15:06:42,256 INFO  L78                 Accepts]: Start accepts. Automaton has 30868 states and 47285 transitions. Word has length 320
[2020-08-21 15:06:42,256 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:42,257 INFO  L479      AbstractCegarLoop]: Abstraction has 30868 states and 47285 transitions.
[2020-08-21 15:06:42,257 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:42,257 INFO  L276                IsEmpty]: Start isEmpty. Operand 30868 states and 47285 transitions.
[2020-08-21 15:06:42,304 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-21 15:06:42,304 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:42,305 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]
[2020-08-21 15:06:42,306 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 15:06:42,307 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:42,307 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:42,307 INFO  L82        PathProgramCache]: Analyzing trace with hash -810813248, now seen corresponding path program 1 times
[2020-08-21 15:06:42,307 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:42,308 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460248536]
[2020-08-21 15:06:42,308 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:42,347 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:42,979 WARN  L193               SmtUtils]: Spent 544.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:42,980 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:42,985 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:43,066 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 15:06:43,068 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460248536]
[2020-08-21 15:06:43,069 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:43,069 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:43,069 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106060756]
[2020-08-21 15:06:43,070 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:43,070 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:43,070 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:43,071 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:43,071 INFO  L87              Difference]: Start difference. First operand 30868 states and 47285 transitions. Second operand 4 states.