/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --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.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 18:19:11,592 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 18:19:11,595 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 18:19:11,638 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 18:19:11,638 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 18:19:11,652 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 18:19:11,654 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 18:19:11,657 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 18:19:11,660 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 18:19:11,662 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 18:19:11,664 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 18:19:11,666 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 18:19:11,667 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 18:19:11,671 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 18:19:11,672 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 18:19:11,673 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 18:19:11,677 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 18:19:11,678 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 18:19:11,680 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 18:19:11,688 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 18:19:11,689 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 18:19:11,691 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 18:19:11,692 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 18:19:11,694 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 18:19:11,699 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 18:19:11,699 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 18:19:11,699 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 18:19:11,702 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 18:19:11,703 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 18:19:11,705 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 18:19:11,705 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 18:19:11,706 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 18:19:11,707 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 18:19:11,707 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 18:19:11,708 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 18:19:11,709 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 18:19:11,709 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 18:19:11,710 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 18:19:11,710 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 18:19:11,711 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 18:19:11,712 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 18:19:11,713 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 18:19:11,760 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 18:19:11,761 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 18:19:11,763 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 18:19:11,763 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 18:19:11,763 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 18:19:11,764 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 18:19:11,764 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 18:19:11,765 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 18:19:11,765 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 18:19:11,765 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 18:19:11,766 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 18:19:11,766 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 18:19:11,767 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 18:19:11,767 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 18:19:11,767 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 18:19:11,768 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 18:19:11,768 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 18:19:11,768 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 18:19:11,768 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 18:19:11,769 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 18:19:11,769 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 18:19:11,769 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 18:19:11,769 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 18:19:11,769 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 18:19:11,770 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 18:19:11,770 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 18:19:11,770 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 18:19:11,770 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 18:19:11,770 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 18:19:11,771 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=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true;
[2020-08-21 18:19:12,069 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 18:19:12,082 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 18:19:12,086 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 18:19:12,087 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 18:19:12,088 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 18:19:12,089 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:12,153 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c832166ee/46550e2e8fe040bbac77e6ad1d860452/FLAGa91bd6227
[2020-08-21 18:19:12,784 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 18:19:12,785 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:12,813 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c832166ee/46550e2e8fe040bbac77e6ad1d860452/FLAGa91bd6227
[2020-08-21 18:19:13,035 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c832166ee/46550e2e8fe040bbac77e6ad1d860452
[2020-08-21 18:19:13,044 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 18:19:13,046 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 18:19:13,049 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 18:19:13,050 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 18:19:13,054 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 18:19:13,055 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:13" (1/1) ...
[2020-08-21 18:19:13,058 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f14d527 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:13, skipping insertion in model container
[2020-08-21 18:19:13,058 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:13" (1/1) ...
[2020-08-21 18:19:13,066 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 18:19:13,188 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 18:19:14,304 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:19:14,319 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 18:19:14,799 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:19:14,831 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 18:19:14,833 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14 WrapperNode
[2020-08-21 18:19:14,833 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 18:19:14,834 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 18:19:14,834 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 18:19:14,834 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 18:19:14,850 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:14,852 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:14,907 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:14,908 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:14,974 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:14,997 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:15,005 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (1/1) ...
[2020-08-21 18:19:15,018 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 18:19:15,018 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 18:19:15,019 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 18:19:15,019 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 18:19:15,020 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (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 18:19:15,124 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 18:19:15,124 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 18:19:15,124 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 18:19:15,125 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 18:19:15,125 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 18:19:15,125 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 18:19:15,125 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 18:19:15,126 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 18:19:15,126 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 18:19:15,126 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 18:19:15,126 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 18:19:15,126 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 18:19:15,127 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 18:19:15,127 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 18:19:15,127 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 18:19:15,128 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 18:19:15,128 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 18:19:15,128 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 18:19:15,128 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 18:19:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 18:19:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 18:19:17,763 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 18:19:17,764 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 18:19:17,774 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:17 BoogieIcfgContainer
[2020-08-21 18:19:17,774 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 18:19:17,776 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 18:19:17,776 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 18:19:17,779 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 18:19:17,780 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:19:13" (1/3) ...
[2020-08-21 18:19:17,781 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@130be648 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:17, skipping insertion in model container
[2020-08-21 18:19:17,781 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:14" (2/3) ...
[2020-08-21 18:19:17,781 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@130be648 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:17, skipping insertion in model container
[2020-08-21 18:19:17,781 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:17" (3/3) ...
[2020-08-21 18:19:17,783 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:17,794 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 18:19:17,803 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 18:19:17,819 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 18:19:17,850 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 18:19:17,850 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 18:19:17,850 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 18:19:17,850 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 18:19:17,850 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 18:19:17,851 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 18:19:17,851 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 18:19:17,851 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 18:19:17,885 INFO  L276                IsEmpty]: Start isEmpty. Operand 795 states.
[2020-08-21 18:19:17,913 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 325
[2020-08-21 18:19:17,913 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:17,915 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:17,915 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:17,921 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:17,922 INFO  L82        PathProgramCache]: Analyzing trace with hash -2046950044, now seen corresponding path program 1 times
[2020-08-21 18:19:17,931 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:17,931 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780321432]
[2020-08-21 18:19:17,932 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:18,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:19,818 WARN  L193               SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:19:19,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:19,827 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:20,080 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 18:19:20,081 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780321432]
[2020-08-21 18:19:20,083 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:20,083 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 18:19:20,084 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324768123]
[2020-08-21 18:19:20,090 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 18:19:20,090 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:20,105 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 18:19:20,106 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 18:19:20,108 INFO  L87              Difference]: Start difference. First operand 795 states. Second operand 5 states.
[2020-08-21 18:19:28,476 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:28,476 INFO  L93              Difference]: Finished difference Result 2333 states and 4147 transitions.
[2020-08-21 18:19:28,478 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-21 18:19:28,480 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 324
[2020-08-21 18:19:28,481 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:28,515 INFO  L225             Difference]: With dead ends: 2333
[2020-08-21 18:19:28,515 INFO  L226             Difference]: Without dead ends: 1545
[2020-08-21 18:19:28,524 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 18:19:28,548 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1545 states.
[2020-08-21 18:19:28,679 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1545 to 1543.
[2020-08-21 18:19:28,680 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1543 states.
[2020-08-21 18:19:28,689 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1543 states to 1543 states and 2401 transitions.
[2020-08-21 18:19:28,691 INFO  L78                 Accepts]: Start accepts. Automaton has 1543 states and 2401 transitions. Word has length 324
[2020-08-21 18:19:28,692 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:28,692 INFO  L479      AbstractCegarLoop]: Abstraction has 1543 states and 2401 transitions.
[2020-08-21 18:19:28,692 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 18:19:28,693 INFO  L276                IsEmpty]: Start isEmpty. Operand 1543 states and 2401 transitions.
[2020-08-21 18:19:28,701 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 18:19:28,702 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:28,702 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:28,703 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 18:19:28,703 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:28,703 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:28,704 INFO  L82        PathProgramCache]: Analyzing trace with hash 1516440759, now seen corresponding path program 1 times
[2020-08-21 18:19:28,704 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:28,704 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938251614]
[2020-08-21 18:19:28,705 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:28,872 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:29,487 WARN  L193               SmtUtils]: Spent 489.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:19:29,489 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:29,498 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:29,833 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 18:19:29,834 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938251614]
[2020-08-21 18:19:29,835 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:29,835 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:29,835 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588538073]
[2020-08-21 18:19:29,838 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:29,838 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:29,839 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:29,839 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:29,840 INFO  L87              Difference]: Start difference. First operand 1543 states and 2401 transitions. Second operand 4 states.
[2020-08-21 18:19:38,269 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:38,269 INFO  L93              Difference]: Finished difference Result 4438 states and 6875 transitions.
[2020-08-21 18:19:38,270 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:19:38,270 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-21 18:19:38,271 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:38,287 INFO  L225             Difference]: With dead ends: 4438
[2020-08-21 18:19:38,288 INFO  L226             Difference]: Without dead ends: 3024
[2020-08-21 18:19:38,293 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:38,298 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3024 states.
[2020-08-21 18:19:38,479 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3024 to 3022.
[2020-08-21 18:19:38,479 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3022 states.
[2020-08-21 18:19:38,490 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3022 states to 3022 states and 4679 transitions.
[2020-08-21 18:19:38,490 INFO  L78                 Accepts]: Start accepts. Automaton has 3022 states and 4679 transitions. Word has length 326
[2020-08-21 18:19:38,491 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:38,491 INFO  L479      AbstractCegarLoop]: Abstraction has 3022 states and 4679 transitions.
[2020-08-21 18:19:38,491 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:38,492 INFO  L276                IsEmpty]: Start isEmpty. Operand 3022 states and 4679 transitions.
[2020-08-21 18:19:38,502 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 18:19:38,502 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:38,502 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:38,503 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 18:19:38,503 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:38,503 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:38,504 INFO  L82        PathProgramCache]: Analyzing trace with hash -545695684, now seen corresponding path program 1 times
[2020-08-21 18:19:38,504 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:38,504 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24913056]
[2020-08-21 18:19:38,505 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:38,548 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:39,016 WARN  L193               SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:19:39,017 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:39,023 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:39,113 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 18:19:39,114 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24913056]
[2020-08-21 18:19:39,114 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:39,115 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:39,115 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374350752]
[2020-08-21 18:19:39,116 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:39,116 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:39,116 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:39,117 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:39,117 INFO  L87              Difference]: Start difference. First operand 3022 states and 4679 transitions. Second operand 4 states.
[2020-08-21 18:19:47,240 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:47,241 INFO  L93              Difference]: Finished difference Result 8991 states and 13913 transitions.
[2020-08-21 18:19:47,241 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:19:47,242 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-21 18:19:47,242 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:47,269 INFO  L225             Difference]: With dead ends: 8991
[2020-08-21 18:19:47,269 INFO  L226             Difference]: Without dead ends: 6011
[2020-08-21 18:19:47,275 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 18:19:47,283 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6011 states.
[2020-08-21 18:19:47,418 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6011 to 3041.
[2020-08-21 18:19:47,419 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3041 states.
[2020-08-21 18:19:47,428 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3041 states to 3041 states and 4707 transitions.
[2020-08-21 18:19:47,429 INFO  L78                 Accepts]: Start accepts. Automaton has 3041 states and 4707 transitions. Word has length 326
[2020-08-21 18:19:47,429 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:47,429 INFO  L479      AbstractCegarLoop]: Abstraction has 3041 states and 4707 transitions.
[2020-08-21 18:19:47,429 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:47,429 INFO  L276                IsEmpty]: Start isEmpty. Operand 3041 states and 4707 transitions.
[2020-08-21 18:19:47,438 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 328
[2020-08-21 18:19:47,438 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:47,439 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:47,439 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 18:19:47,439 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:47,440 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:47,440 INFO  L82        PathProgramCache]: Analyzing trace with hash -441096328, now seen corresponding path program 1 times
[2020-08-21 18:19:47,440 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:47,441 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961006983]
[2020-08-21 18:19:47,441 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:47,486 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:47,957 WARN  L193               SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:19:47,959 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:47,965 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:48,048 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 18:19:48,048 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961006983]
[2020-08-21 18:19:48,049 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:48,049 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:48,049 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338933872]
[2020-08-21 18:19:48,050 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:48,050 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:48,050 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:48,051 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:48,051 INFO  L87              Difference]: Start difference. First operand 3041 states and 4707 transitions. Second operand 4 states.
[2020-08-21 18:19:56,119 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:56,120 INFO  L93              Difference]: Finished difference Result 9010 states and 13934 transitions.
[2020-08-21 18:19:56,122 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:19:56,122 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 327
[2020-08-21 18:19:56,123 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:56,149 INFO  L225             Difference]: With dead ends: 9010
[2020-08-21 18:19:56,149 INFO  L226             Difference]: Without dead ends: 6029
[2020-08-21 18:19:56,157 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 18:19:56,165 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6029 states.
[2020-08-21 18:19:56,313 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6029 to 3059.
[2020-08-21 18:19:56,314 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3059 states.
[2020-08-21 18:19:56,321 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3059 states to 3059 states and 4728 transitions.
[2020-08-21 18:19:56,322 INFO  L78                 Accepts]: Start accepts. Automaton has 3059 states and 4728 transitions. Word has length 327
[2020-08-21 18:19:56,322 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:56,322 INFO  L479      AbstractCegarLoop]: Abstraction has 3059 states and 4728 transitions.
[2020-08-21 18:19:56,323 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:56,323 INFO  L276                IsEmpty]: Start isEmpty. Operand 3059 states and 4728 transitions.
[2020-08-21 18:19:56,334 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-21 18:19:56,334 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:56,335 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:56,335 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 18:19:56,336 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:56,336 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:56,336 INFO  L82        PathProgramCache]: Analyzing trace with hash -1648776142, now seen corresponding path program 1 times
[2020-08-21 18:19:56,336 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:56,337 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960855381]
[2020-08-21 18:19:56,337 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:56,464 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:57,047 WARN  L193               SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:19:57,048 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:57,057 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:57,237 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 18:19:57,238 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960855381]
[2020-08-21 18:19:57,238 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:57,239 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:57,239 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277363333]
[2020-08-21 18:19:57,240 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:57,241 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:57,241 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:57,241 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:57,241 INFO  L87              Difference]: Start difference. First operand 3059 states and 4728 transitions. Second operand 4 states.
[2020-08-21 18:20:05,473 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:20:05,473 INFO  L93              Difference]: Finished difference Result 8718 states and 13409 transitions.
[2020-08-21 18:20:05,474 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:20:05,474 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-21 18:20:05,475 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:20:05,499 INFO  L225             Difference]: With dead ends: 8718
[2020-08-21 18:20:05,499 INFO  L226             Difference]: Without dead ends: 5904
[2020-08-21 18:20:05,506 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 18:20:05,514 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5904 states.
[2020-08-21 18:20:05,776 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5904 to 5902.
[2020-08-21 18:20:05,776 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5902 states.
[2020-08-21 18:20:05,793 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5902 states to 5902 states and 9056 transitions.
[2020-08-21 18:20:05,794 INFO  L78                 Accepts]: Start accepts. Automaton has 5902 states and 9056 transitions. Word has length 328
[2020-08-21 18:20:05,795 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:20:05,795 INFO  L479      AbstractCegarLoop]: Abstraction has 5902 states and 9056 transitions.
[2020-08-21 18:20:05,796 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:20:05,796 INFO  L276                IsEmpty]: Start isEmpty. Operand 5902 states and 9056 transitions.
[2020-08-21 18:20:05,814 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-21 18:20:05,815 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:20:05,815 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:20:05,815 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 18:20:05,816 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:20:05,817 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:20:05,817 INFO  L82        PathProgramCache]: Analyzing trace with hash 157244175, now seen corresponding path program 1 times
[2020-08-21 18:20:05,817 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:20:05,818 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11206012]
[2020-08-21 18:20:05,820 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:20:06,215 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:06,854 WARN  L193               SmtUtils]: Spent 460.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:20:06,857 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:20:06,865 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:06,959 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 18:20:06,959 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11206012]
[2020-08-21 18:20:06,960 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:20:06,960 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 18:20:06,961 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712318548]
[2020-08-21 18:20:06,961 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 18:20:06,962 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:20:06,971 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 18:20:06,971 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 18:20:06,971 INFO  L87              Difference]: Start difference. First operand 5902 states and 9056 transitions. Second operand 5 states.
[2020-08-21 18:20:13,322 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:20:13,323 INFO  L93              Difference]: Finished difference Result 13189 states and 20201 transitions.
[2020-08-21 18:20:13,324 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 18:20:13,324 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 328
[2020-08-21 18:20:13,324 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:20:13,347 INFO  L225             Difference]: With dead ends: 13189
[2020-08-21 18:20:13,347 INFO  L226             Difference]: Without dead ends: 6775
[2020-08-21 18:20:13,357 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 18:20:13,369 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6775 states.
[2020-08-21 18:20:13,634 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6775 to 6773.
[2020-08-21 18:20:13,635 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 6773 states.
[2020-08-21 18:20:13,648 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 6773 states to 6773 states and 10350 transitions.
[2020-08-21 18:20:13,648 INFO  L78                 Accepts]: Start accepts. Automaton has 6773 states and 10350 transitions. Word has length 328
[2020-08-21 18:20:13,648 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:20:13,648 INFO  L479      AbstractCegarLoop]: Abstraction has 6773 states and 10350 transitions.
[2020-08-21 18:20:13,649 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 18:20:13,649 INFO  L276                IsEmpty]: Start isEmpty. Operand 6773 states and 10350 transitions.
[2020-08-21 18:20:13,664 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 18:20:13,664 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:20:13,664 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:20:13,665 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 18:20:13,665 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:20:13,665 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:20:13,665 INFO  L82        PathProgramCache]: Analyzing trace with hash -1619567406, now seen corresponding path program 1 times
[2020-08-21 18:20:13,666 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:20:13,666 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189770036]
[2020-08-21 18:20:13,666 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:20:13,708 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:14,231 WARN  L193               SmtUtils]: Spent 438.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-08-21 18:20:14,232 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:20:14,238 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:14,324 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 18:20:14,324 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189770036]
[2020-08-21 18:20:14,325 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:20:14,325 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:20:14,325 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907475954]
[2020-08-21 18:20:14,326 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:20:14,326 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:20:14,326 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:20:14,327 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:20:14,327 INFO  L87              Difference]: Start difference. First operand 6773 states and 10350 transitions. Second operand 4 states.