/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=WIDEST -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 0.1.25-5644d1e-m
[2020-08-18 22:53:39,685 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 22:53:39,687 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 22:53:39,711 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 22:53:39,712 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 22:53:39,713 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 22:53:39,714 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 22:53:39,716 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 22:53:39,718 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 22:53:39,719 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 22:53:39,720 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 22:53:39,721 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 22:53:39,722 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 22:53:39,723 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 22:53:39,724 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 22:53:39,725 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 22:53:39,726 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 22:53:39,727 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 22:53:39,728 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 22:53:39,731 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 22:53:39,732 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 22:53:39,734 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 22:53:39,735 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 22:53:39,736 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 22:53:39,739 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 22:53:39,739 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 22:53:39,739 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 22:53:39,740 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 22:53:39,741 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 22:53:39,742 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 22:53:39,742 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 22:53:39,743 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 22:53:39,744 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 22:53:39,745 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 22:53:39,746 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 22:53:39,748 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 22:53:39,749 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 22:53:39,749 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 22:53:39,751 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 22:53:39,752 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 22:53:39,795 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 22:53:39,796 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 22:53:39,797 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 22:53:39,798 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 22:53:39,798 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 22:53:39,798 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 22:53:39,799 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 22:53:39,799 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 22:53:39,799 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 22:53:39,799 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 22:53:39,800 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 22:53:39,800 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 22:53:39,801 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 22:53:39,801 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 22:53:39,802 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 22:53:39,802 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 22:53:39,802 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 22:53:39,802 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 22:53:39,802 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 22:53:39,803 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 22:53:39,803 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 22:53:39,803 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 22:53:39,803 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 22:53:39,804 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 22:53:39,804 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 22:53:39,804 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 22:53:39,804 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 22:53:39,804 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 22:53:39,805 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 22:53:39,805 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=WIDEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST;
[2020-08-18 22:53:40,127 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 22:53:40,144 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 22:53:40,147 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 22:53:40,149 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 22:53:40,149 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 22:53:40,150 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 22:53:40,219 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a47de39fe/171d150e5ee1431281b201709dbda669/FLAG01f4016a4
[2020-08-18 22:53:40,885 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 22:53:40,885 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 22:53:40,916 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a47de39fe/171d150e5ee1431281b201709dbda669/FLAG01f4016a4
[2020-08-18 22:53:41,073 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a47de39fe/171d150e5ee1431281b201709dbda669
[2020-08-18 22:53:41,083 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 22:53:41,085 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 22:53:41,086 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 22:53:41,086 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 22:53:41,090 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 22:53:41,091 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:53:41" (1/1) ...
[2020-08-18 22:53:41,094 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3386436d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:41, skipping insertion in model container
[2020-08-18 22:53:41,094 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:53:41" (1/1) ...
[2020-08-18 22:53:41,103 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 22:53:41,204 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 22:53:42,293 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 22:53:42,308 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 22:53:42,706 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 22:53:42,742 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 22:53:42,743 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42 WrapperNode
[2020-08-18 22:53:42,743 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 22:53:42,744 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 22:53:42,744 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 22:53:42,745 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 22:53:42,759 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,761 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,812 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,812 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,901 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,934 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,941 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (1/1) ...
[2020-08-18 22:53:42,953 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 22:53:42,954 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 22:53:42,954 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 22:53:42,954 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 22:53:42,955 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (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 22:53:43,043 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 22:53:43,043 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 22:53:43,043 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 22:53:43,043 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 22:53:43,044 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 22:53:43,045 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 22:53:43,045 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 22:53:43,045 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 22:53:43,045 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 22:53:43,045 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 22:53:43,046 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 22:53:43,046 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 22:53:43,046 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 22:53:43,046 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 22:53:43,047 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 22:53:43,047 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 22:53:43,047 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 22:53:45,617 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 22:53:45,617 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 22:53:45,628 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:53:45 BoogieIcfgContainer
[2020-08-18 22:53:45,628 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 22:53:45,629 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 22:53:45,629 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 22:53:45,632 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 22:53:45,633 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:53:41" (1/3) ...
[2020-08-18 22:53:45,633 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bc3c802 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:53:45, skipping insertion in model container
[2020-08-18 22:53:45,634 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:53:42" (2/3) ...
[2020-08-18 22:53:45,634 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bc3c802 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:53:45, skipping insertion in model container
[2020-08-18 22:53:45,634 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:53:45" (3/3) ...
[2020-08-18 22:53:45,636 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 22:53:45,646 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 22:53:45,654 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 22:53:45,668 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 22:53:45,702 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 22:53:45,702 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 22:53:45,702 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 22:53:45,702 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 22:53:45,703 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 22:53:45,703 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 22:53:45,703 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 22:53:45,703 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 22:53:45,746 INFO  L276                IsEmpty]: Start isEmpty. Operand 796 states.
[2020-08-18 22:53:45,777 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 22:53:45,777 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:53:45,778 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]
[2020-08-18 22:53:45,779 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:53:45,784 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:53:45,784 INFO  L82        PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times
[2020-08-18 22:53:45,792 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:53:45,792 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472410760]
[2020-08-18 22:53:45,793 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:53:46,465 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:53:47,299 WARN  L193               SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:53:47,306 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:53:47,313 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:53:47,588 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 22:53:47,589 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472410760]
[2020-08-18 22:53:47,591 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:53:47,592 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:53:47,593 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689362926]
[2020-08-18 22:53:47,601 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:53:47,602 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:53:47,616 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:53:47,617 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:53:47,619 INFO  L87              Difference]: Start difference. First operand 796 states. Second operand 4 states.
[2020-08-18 22:53:48,110 WARN  L193               SmtUtils]: Spent 413.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 22:53:52,975 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:53:52,976 INFO  L93              Difference]: Finished difference Result 1515 states and 2659 transitions.
[2020-08-18 22:53:52,977 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 22:53:52,978 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 22:53:52,980 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:53:53,007 INFO  L225             Difference]: With dead ends: 1515
[2020-08-18 22:53:53,008 INFO  L226             Difference]: Without dead ends: 1299
[2020-08-18 22:53:53,014 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 22:53:53,032 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1299 states.
[2020-08-18 22:53:53,144 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297.
[2020-08-18 22:53:53,146 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1297 states.
[2020-08-18 22:53:53,152 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions.
[2020-08-18 22:53:53,154 INFO  L78                 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318
[2020-08-18 22:53:53,156 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:53:53,156 INFO  L479      AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions.
[2020-08-18 22:53:53,156 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 22:53:53,156 INFO  L276                IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions.
[2020-08-18 22:53:53,164 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 22:53:53,164 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:53:53,165 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]
[2020-08-18 22:53:53,165 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 22:53:53,165 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:53:53,166 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:53:53,166 INFO  L82        PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times
[2020-08-18 22:53:53,166 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:53:53,166 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555517339]
[2020-08-18 22:53:53,167 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:53:53,366 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:53:53,936 WARN  L193               SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:53:53,938 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:53:53,943 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:53:54,162 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 22:53:54,163 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555517339]
[2020-08-18 22:53:54,163 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:53:54,164 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:53:54,164 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917465417]
[2020-08-18 22:53:54,167 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:53:54,167 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:53:54,168 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:53:54,168 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:53:54,168 INFO  L87              Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states.
[2020-08-18 22:53:54,776 WARN  L193               SmtUtils]: Spent 548.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 22:53:59,532 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:53:59,532 INFO  L93              Difference]: Finished difference Result 2671 states and 4201 transitions.
[2020-08-18 22:53:59,532 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 22:53:59,533 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 22:53:59,535 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:53:59,550 INFO  L225             Difference]: With dead ends: 2671
[2020-08-18 22:53:59,550 INFO  L226             Difference]: Without dead ends: 2289
[2020-08-18 22:53:59,558 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 22:53:59,562 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2289 states.
[2020-08-18 22:53:59,643 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287.
[2020-08-18 22:53:59,645 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2287 states.
[2020-08-18 22:53:59,656 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions.
[2020-08-18 22:53:59,657 INFO  L78                 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318
[2020-08-18 22:53:59,658 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:53:59,659 INFO  L479      AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions.
[2020-08-18 22:53:59,659 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 22:53:59,659 INFO  L276                IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions.
[2020-08-18 22:53:59,666 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 22:53:59,667 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:53:59,671 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]
[2020-08-18 22:53:59,671 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 22:53:59,671 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:53:59,672 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:53:59,672 INFO  L82        PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times
[2020-08-18 22:53:59,672 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:53:59,673 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747113230]
[2020-08-18 22:53:59,674 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:53:59,881 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:00,466 WARN  L193               SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:54:00,468 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:54:00,476 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:00,715 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 22:54:00,716 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747113230]
[2020-08-18 22:54:00,716 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:54:00,717 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:54:00,717 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104755602]
[2020-08-18 22:54:00,718 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:54:00,718 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:54:00,718 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:54:00,719 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:54:00,719 INFO  L87              Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states.
[2020-08-18 22:54:01,125 WARN  L193               SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 22:54:05,207 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:54:05,208 INFO  L93              Difference]: Finished difference Result 4943 states and 7762 transitions.
[2020-08-18 22:54:05,208 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 22:54:05,209 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 22:54:05,210 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:54:05,229 INFO  L225             Difference]: With dead ends: 4943
[2020-08-18 22:54:05,230 INFO  L226             Difference]: Without dead ends: 4229
[2020-08-18 22:54:05,233 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 22:54:05,239 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4229 states.
[2020-08-18 22:54:05,341 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227.
[2020-08-18 22:54:05,341 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4227 states.
[2020-08-18 22:54:05,355 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions.
[2020-08-18 22:54:05,355 INFO  L78                 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318
[2020-08-18 22:54:05,356 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:54:05,356 INFO  L479      AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions.
[2020-08-18 22:54:05,356 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 22:54:05,356 INFO  L276                IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions.
[2020-08-18 22:54:05,367 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 22:54:05,367 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:54:05,368 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]
[2020-08-18 22:54:05,368 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 22:54:05,368 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:54:05,368 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:54:05,369 INFO  L82        PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times
[2020-08-18 22:54:05,369 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:54:05,370 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231240404]
[2020-08-18 22:54:05,370 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:54:05,565 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:06,165 WARN  L193               SmtUtils]: Spent 464.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:54:06,166 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:54:06,173 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:06,378 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 22:54:06,379 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231240404]
[2020-08-18 22:54:06,379 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:54:06,379 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:54:06,380 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152063533]
[2020-08-18 22:54:06,381 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:54:06,381 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:54:06,381 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:54:06,382 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:54:06,382 INFO  L87              Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states.
[2020-08-18 22:54:06,808 WARN  L193               SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 22:54:11,043 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:54:11,044 INFO  L93              Difference]: Finished difference Result 9359 states and 14670 transitions.
[2020-08-18 22:54:11,044 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 22:54:11,044 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 22:54:11,045 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:54:11,080 INFO  L225             Difference]: With dead ends: 9359
[2020-08-18 22:54:11,081 INFO  L226             Difference]: Without dead ends: 8029
[2020-08-18 22:54:11,085 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 22:54:11,095 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8029 states.
[2020-08-18 22:54:11,277 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027.
[2020-08-18 22:54:11,278 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8027 states.
[2020-08-18 22:54:11,307 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions.
[2020-08-18 22:54:11,308 INFO  L78                 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318
[2020-08-18 22:54:11,308 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:54:11,309 INFO  L479      AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions.
[2020-08-18 22:54:11,309 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 22:54:11,309 INFO  L276                IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions.
[2020-08-18 22:54:11,326 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 22:54:11,326 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:54:11,327 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]
[2020-08-18 22:54:11,327 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 22:54:11,327 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:54:11,328 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:54:11,329 INFO  L82        PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times
[2020-08-18 22:54:11,329 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:54:11,329 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984504561]
[2020-08-18 22:54:11,330 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:54:11,652 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:12,287 WARN  L193               SmtUtils]: Spent 403.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:54:12,288 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:54:12,297 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:12,432 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 22:54:12,433 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984504561]
[2020-08-18 22:54:12,433 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:54:12,433 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 22:54:12,433 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038078495]
[2020-08-18 22:54:12,434 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 22:54:12,434 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:54:12,434 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 22:54:12,435 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 22:54:12,435 INFO  L87              Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states.
[2020-08-18 22:54:19,679 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:54:19,680 INFO  L93              Difference]: Finished difference Result 23754 states and 36777 transitions.
[2020-08-18 22:54:19,680 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 22:54:19,681 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 318
[2020-08-18 22:54:19,681 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:54:19,737 INFO  L225             Difference]: With dead ends: 23754
[2020-08-18 22:54:19,737 INFO  L226             Difference]: Without dead ends: 15742
[2020-08-18 22:54:19,757 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 22:54:19,775 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15742 states.
[2020-08-18 22:54:20,362 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740.
[2020-08-18 22:54:20,363 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15740 states.
[2020-08-18 22:54:20,393 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions.
[2020-08-18 22:54:20,393 INFO  L78                 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318
[2020-08-18 22:54:20,393 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:54:20,394 INFO  L479      AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions.
[2020-08-18 22:54:20,394 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 22:54:20,394 INFO  L276                IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions.
[2020-08-18 22:54:20,422 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-18 22:54:20,423 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:54:20,423 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]
[2020-08-18 22:54:20,425 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 22:54:20,429 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:54:20,429 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:54:20,429 INFO  L82        PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times
[2020-08-18 22:54:20,429 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:54:20,430 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264169032]
[2020-08-18 22:54:20,430 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:54:20,525 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:21,022 WARN  L193               SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:54:21,024 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:54:21,030 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:21,179 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 22:54:21,179 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264169032]
[2020-08-18 22:54:21,180 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:54:21,180 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:54:21,180 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677784432]
[2020-08-18 22:54:21,181 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:54:21,181 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:54:21,181 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:54:21,182 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:54:21,182 INFO  L87              Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states.
[2020-08-18 22:54:29,309 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 22:54:29,309 INFO  L93              Difference]: Finished difference Result 46481 states and 71518 transitions.
[2020-08-18 22:54:29,310 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 22:54:29,310 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 320
[2020-08-18 22:54:29,310 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 22:54:29,377 INFO  L225             Difference]: With dead ends: 46481
[2020-08-18 22:54:29,377 INFO  L226             Difference]: Without dead ends: 30870
[2020-08-18 22:54:29,416 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 22:54:29,459 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30870 states.
[2020-08-18 22:54:31,264 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30870 to 30868.
[2020-08-18 22:54:31,265 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30868 states.
[2020-08-18 22:54:31,343 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30868 states to 30868 states and 47285 transitions.
[2020-08-18 22:54:31,343 INFO  L78                 Accepts]: Start accepts. Automaton has 30868 states and 47285 transitions. Word has length 320
[2020-08-18 22:54:31,344 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 22:54:31,344 INFO  L479      AbstractCegarLoop]: Abstraction has 30868 states and 47285 transitions.
[2020-08-18 22:54:31,344 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 22:54:31,344 INFO  L276                IsEmpty]: Start isEmpty. Operand 30868 states and 47285 transitions.
[2020-08-18 22:54:31,413 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-18 22:54:31,413 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 22:54:31,414 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]
[2020-08-18 22:54:31,414 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 22:54:31,415 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 22:54:31,415 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 22:54:31,415 INFO  L82        PathProgramCache]: Analyzing trace with hash -810813248, now seen corresponding path program 1 times
[2020-08-18 22:54:31,416 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 22:54:31,416 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002847222]
[2020-08-18 22:54:31,416 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 22:54:31,476 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:31,896 WARN  L193               SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 22:54:31,897 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 22:54:31,901 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 22:54:31,984 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 22:54:31,986 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002847222]
[2020-08-18 22:54:31,986 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 22:54:31,987 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 22:54:31,987 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226904502]
[2020-08-18 22:54:31,987 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 22:54:31,988 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 22:54:31,988 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 22:54:31,988 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 22:54:31,988 INFO  L87              Difference]: Start difference. First operand 30868 states and 47285 transitions. Second operand 4 states.