/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=SMALLEST -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 12:18:52,759 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 12:18:52,762 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 12:18:52,800 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 12:18:52,800 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 12:18:52,812 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 12:18:52,814 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 12:18:52,816 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 12:18:52,818 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 12:18:52,821 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 12:18:52,823 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 12:18:52,825 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 12:18:52,825 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 12:18:52,828 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 12:18:52,828 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 12:18:52,831 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 12:18:52,833 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 12:18:52,835 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 12:18:52,837 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 12:18:52,841 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 12:18:52,842 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 12:18:52,843 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 12:18:52,844 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 12:18:52,845 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 12:18:52,847 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 12:18:52,847 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 12:18:52,848 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 12:18:52,848 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 12:18:52,849 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 12:18:52,850 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 12:18:52,850 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 12:18:52,850 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 12:18:52,851 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 12:18:52,852 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 12:18:52,853 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 12:18:52,853 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 12:18:52,854 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 12:18:52,854 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 12:18:52,854 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 12:18:52,855 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 12:18:52,856 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 12:18:52,878 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 12:18:52,878 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 12:18:52,879 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 12:18:52,880 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 12:18:52,880 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 12:18:52,880 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 12:18:52,880 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 12:18:52,881 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 12:18:52,881 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 12:18:52,881 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 12:18:52,881 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 12:18:52,881 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 12:18:52,882 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 12:18:52,882 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 12:18:52,882 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 12:18:52,882 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 12:18:52,882 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 12:18:52,883 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 12:18:52,883 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 12:18:52,883 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 12:18:52,883 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 12:18:52,883 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 12:18:52,884 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 12:18:52,884 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 12:18:52,884 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 12:18:52,884 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 12:18:52,884 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 12:18:52,885 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 12:18:52,885 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 12:18:52,885 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=SMALLEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST;
[2020-08-18 12:18:53,157 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 12:18:53,170 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 12:18:53,173 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 12:18:53,175 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 12:18:53,175 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 12:18:53,176 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 12:18:53,239 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2ae46eac6/d4aa8850a6884ceba95c5cf9423e68b2/FLAG5384218ce
[2020-08-18 12:18:53,883 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 12:18:53,884 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 12:18:53,902 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2ae46eac6/d4aa8850a6884ceba95c5cf9423e68b2/FLAG5384218ce
[2020-08-18 12:18:54,077 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2ae46eac6/d4aa8850a6884ceba95c5cf9423e68b2
[2020-08-18 12:18:54,087 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 12:18:54,089 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 12:18:54,090 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 12:18:54,090 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 12:18:54,094 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 12:18:54,095 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:18:54" (1/1) ...
[2020-08-18 12:18:54,098 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c79f013 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:54, skipping insertion in model container
[2020-08-18 12:18:54,098 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:18:54" (1/1) ...
[2020-08-18 12:18:54,106 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 12:18:54,209 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 12:18:55,261 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 12:18:55,274 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 12:18:55,723 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 12:18:55,753 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 12:18:55,753 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55 WrapperNode
[2020-08-18 12:18:55,754 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 12:18:55,755 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 12:18:55,755 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 12:18:55,755 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 12:18:55,776 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,779 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,837 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,837 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,909 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,960 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,973 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (1/1) ...
[2020-08-18 12:18:55,999 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 12:18:56,000 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 12:18:56,000 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 12:18:56,001 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 12:18:56,002 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (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 12:18:56,093 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 12:18:56,093 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 12:18:56,093 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 12:18:56,094 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 12:18:56,095 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 12:18:56,095 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 12:18:56,095 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 12:18:56,097 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 12:18:56,097 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 12:18:56,097 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 12:18:56,098 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 12:18:56,099 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 12:18:56,099 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 12:18:56,099 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 12:18:56,100 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 12:18:56,101 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 12:18:56,101 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 12:18:56,102 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 12:18:56,102 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 12:18:56,102 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 12:18:56,103 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 12:18:56,103 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 12:18:59,042 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 12:18:59,042 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 12:18:59,061 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:18:59 BoogieIcfgContainer
[2020-08-18 12:18:59,061 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 12:18:59,066 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 12:18:59,067 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 12:18:59,071 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 12:18:59,071 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 12:18:54" (1/3) ...
[2020-08-18 12:18:59,072 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69294f9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:18:59, skipping insertion in model container
[2020-08-18 12:18:59,073 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:55" (2/3) ...
[2020-08-18 12:18:59,073 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69294f9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:18:59, skipping insertion in model container
[2020-08-18 12:18:59,074 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:18:59" (3/3) ...
[2020-08-18 12:18:59,076 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 12:18:59,089 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 12:18:59,105 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 12:18:59,120 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 12:18:59,154 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 12:18:59,154 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 12:18:59,154 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 12:18:59,155 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 12:18:59,155 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 12:18:59,155 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 12:18:59,155 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 12:18:59,155 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 12:18:59,199 INFO  L276                IsEmpty]: Start isEmpty. Operand 796 states.
[2020-08-18 12:18:59,247 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 12:18:59,247 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:18:59,249 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 12:18:59,249 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:18:59,255 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:18:59,256 INFO  L82        PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times
[2020-08-18 12:18:59,263 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:18:59,264 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502503625]
[2020-08-18 12:18:59,264 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:18:59,986 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:00,944 WARN  L193               SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:00,947 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:00,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:01,145 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 12:19:01,146 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502503625]
[2020-08-18 12:19:01,149 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:01,149 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:01,150 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901901362]
[2020-08-18 12:19:01,156 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:01,157 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:01,168 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:01,169 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:01,171 INFO  L87              Difference]: Start difference. First operand 796 states. Second operand 4 states.
[2020-08-18 12:19:01,647 WARN  L193               SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 12:19:06,776 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:06,777 INFO  L93              Difference]: Finished difference Result 1515 states and 2659 transitions.
[2020-08-18 12:19:06,778 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:19:06,779 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 12:19:06,781 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:06,819 INFO  L225             Difference]: With dead ends: 1515
[2020-08-18 12:19:06,819 INFO  L226             Difference]: Without dead ends: 1299
[2020-08-18 12:19:06,825 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 12:19:06,842 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1299 states.
[2020-08-18 12:19:06,960 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297.
[2020-08-18 12:19:06,962 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1297 states.
[2020-08-18 12:19:06,969 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions.
[2020-08-18 12:19:06,971 INFO  L78                 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318
[2020-08-18 12:19:06,973 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:06,973 INFO  L479      AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions.
[2020-08-18 12:19:06,973 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 12:19:06,973 INFO  L276                IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions.
[2020-08-18 12:19:06,982 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 12:19:06,982 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:06,983 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 12:19:06,983 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 12:19:06,983 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:06,984 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:06,984 INFO  L82        PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times
[2020-08-18 12:19:06,984 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:06,984 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246700936]
[2020-08-18 12:19:06,985 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:07,248 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:08,036 WARN  L193               SmtUtils]: Spent 606.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:08,038 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:08,049 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:08,307 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 12:19:08,308 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246700936]
[2020-08-18 12:19:08,308 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:08,308 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:08,309 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86577968]
[2020-08-18 12:19:08,312 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:08,313 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:08,313 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:08,314 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:08,314 INFO  L87              Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states.
[2020-08-18 12:19:08,984 WARN  L193               SmtUtils]: Spent 606.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 12:19:13,308 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:13,308 INFO  L93              Difference]: Finished difference Result 2671 states and 4201 transitions.
[2020-08-18 12:19:13,309 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:19:13,309 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 12:19:13,315 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:13,329 INFO  L225             Difference]: With dead ends: 2671
[2020-08-18 12:19:13,330 INFO  L226             Difference]: Without dead ends: 2289
[2020-08-18 12:19:13,339 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 12:19:13,343 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2289 states.
[2020-08-18 12:19:13,429 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287.
[2020-08-18 12:19:13,431 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2287 states.
[2020-08-18 12:19:13,443 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions.
[2020-08-18 12:19:13,443 INFO  L78                 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318
[2020-08-18 12:19:13,445 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:13,445 INFO  L479      AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions.
[2020-08-18 12:19:13,446 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 12:19:13,446 INFO  L276                IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions.
[2020-08-18 12:19:13,455 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 12:19:13,456 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:13,459 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 12:19:13,459 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 12:19:13,460 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:13,460 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:13,460 INFO  L82        PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times
[2020-08-18 12:19:13,461 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:13,461 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808719089]
[2020-08-18 12:19:13,462 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:13,656 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:14,296 WARN  L193               SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:14,297 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:14,304 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:14,438 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 12:19:14,438 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808719089]
[2020-08-18 12:19:14,439 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:14,440 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:14,440 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340624220]
[2020-08-18 12:19:14,441 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:14,442 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:14,443 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:14,444 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:14,444 INFO  L87              Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states.
[2020-08-18 12:19:14,891 WARN  L193               SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 12:19:19,750 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:19,750 INFO  L93              Difference]: Finished difference Result 4943 states and 7762 transitions.
[2020-08-18 12:19:19,751 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:19:19,751 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 12:19:19,752 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:19,772 INFO  L225             Difference]: With dead ends: 4943
[2020-08-18 12:19:19,773 INFO  L226             Difference]: Without dead ends: 4229
[2020-08-18 12:19:19,776 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 12:19:19,781 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4229 states.
[2020-08-18 12:19:19,899 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227.
[2020-08-18 12:19:19,900 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4227 states.
[2020-08-18 12:19:19,913 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions.
[2020-08-18 12:19:19,914 INFO  L78                 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318
[2020-08-18 12:19:19,914 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:19,915 INFO  L479      AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions.
[2020-08-18 12:19:19,915 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 12:19:19,915 INFO  L276                IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions.
[2020-08-18 12:19:19,926 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 12:19:19,926 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:19,926 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 12:19:19,927 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 12:19:19,927 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:19,927 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:19,927 INFO  L82        PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times
[2020-08-18 12:19:19,928 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:19,928 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854498782]
[2020-08-18 12:19:19,929 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:20,093 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:20,667 WARN  L193               SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:20,669 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:20,677 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:20,831 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 12:19:20,832 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854498782]
[2020-08-18 12:19:20,832 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:20,832 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:20,833 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312609444]
[2020-08-18 12:19:20,834 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:20,834 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:20,834 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:20,835 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:20,835 INFO  L87              Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states.
[2020-08-18 12:19:21,262 WARN  L193               SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 12:19:25,280 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:25,280 INFO  L93              Difference]: Finished difference Result 9359 states and 14670 transitions.
[2020-08-18 12:19:25,281 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:19:25,281 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-18 12:19:25,282 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:25,319 INFO  L225             Difference]: With dead ends: 9359
[2020-08-18 12:19:25,319 INFO  L226             Difference]: Without dead ends: 8029
[2020-08-18 12:19:25,325 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 12:19:25,336 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8029 states.
[2020-08-18 12:19:25,568 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027.
[2020-08-18 12:19:25,568 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8027 states.
[2020-08-18 12:19:25,596 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions.
[2020-08-18 12:19:25,597 INFO  L78                 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318
[2020-08-18 12:19:25,597 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:25,598 INFO  L479      AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions.
[2020-08-18 12:19:25,598 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 12:19:25,598 INFO  L276                IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions.
[2020-08-18 12:19:25,615 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-18 12:19:25,615 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:25,616 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 12:19:25,616 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 12:19:25,617 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:25,617 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:25,617 INFO  L82        PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times
[2020-08-18 12:19:25,617 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:25,618 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120336955]
[2020-08-18 12:19:25,618 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:25,920 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:26,643 WARN  L193               SmtUtils]: Spent 537.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:26,644 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:26,650 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:26,803 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 12:19:26,804 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120336955]
[2020-08-18 12:19:26,804 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:26,805 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 12:19:26,805 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119245986]
[2020-08-18 12:19:26,806 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 12:19:26,806 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:26,806 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 12:19:26,806 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 12:19:26,807 INFO  L87              Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states.
[2020-08-18 12:19:34,207 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:34,208 INFO  L93              Difference]: Finished difference Result 23754 states and 36777 transitions.
[2020-08-18 12:19:34,208 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:19:34,208 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 318
[2020-08-18 12:19:34,209 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:34,266 INFO  L225             Difference]: With dead ends: 23754
[2020-08-18 12:19:34,266 INFO  L226             Difference]: Without dead ends: 15742
[2020-08-18 12:19:34,283 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
[2020-08-18 12:19:34,299 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15742 states.
[2020-08-18 12:19:34,785 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740.
[2020-08-18 12:19:34,785 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15740 states.
[2020-08-18 12:19:34,814 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions.
[2020-08-18 12:19:34,814 INFO  L78                 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318
[2020-08-18 12:19:34,815 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:34,815 INFO  L479      AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions.
[2020-08-18 12:19:34,815 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 12:19:34,815 INFO  L276                IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions.
[2020-08-18 12:19:34,845 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-18 12:19:34,846 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:34,846 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 12:19:34,847 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 12:19:34,851 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:34,851 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:34,851 INFO  L82        PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times
[2020-08-18 12:19:34,852 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:34,852 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307198913]
[2020-08-18 12:19:34,852 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:34,953 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:35,447 WARN  L193               SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:35,448 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:35,454 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:35,593 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 12:19:35,594 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307198913]
[2020-08-18 12:19:35,604 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:35,604 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:35,605 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008792859]
[2020-08-18 12:19:35,605 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:35,606 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:35,606 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:35,606 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:35,606 INFO  L87              Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states.
[2020-08-18 12:19:43,629 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:19:43,629 INFO  L93              Difference]: Finished difference Result 46481 states and 71518 transitions.
[2020-08-18 12:19:43,630 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 12:19:43,630 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 320
[2020-08-18 12:19:43,631 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:19:43,703 INFO  L225             Difference]: With dead ends: 46481
[2020-08-18 12:19:43,704 INFO  L226             Difference]: Without dead ends: 30870
[2020-08-18 12:19:43,885 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 12:19:43,916 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30870 states.
[2020-08-18 12:19:44,744 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30870 to 30868.
[2020-08-18 12:19:44,744 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30868 states.
[2020-08-18 12:19:44,784 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30868 states to 30868 states and 47285 transitions.
[2020-08-18 12:19:44,784 INFO  L78                 Accepts]: Start accepts. Automaton has 30868 states and 47285 transitions. Word has length 320
[2020-08-18 12:19:44,785 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:19:44,785 INFO  L479      AbstractCegarLoop]: Abstraction has 30868 states and 47285 transitions.
[2020-08-18 12:19:44,785 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 12:19:44,785 INFO  L276                IsEmpty]: Start isEmpty. Operand 30868 states and 47285 transitions.
[2020-08-18 12:19:44,827 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-18 12:19:44,827 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:19:44,828 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 12:19:44,828 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 12:19:44,828 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:19:44,828 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:19:44,829 INFO  L82        PathProgramCache]: Analyzing trace with hash -810813248, now seen corresponding path program 1 times
[2020-08-18 12:19:44,829 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:19:44,829 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157889107]
[2020-08-18 12:19:44,829 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:19:44,880 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:45,337 WARN  L193               SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 12:19:45,338 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:19:45,344 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:19:46,297 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 12:19:46,298 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157889107]
[2020-08-18 12:19:46,298 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:19:46,299 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 12:19:46,299 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135723908]
[2020-08-18 12:19:46,299 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 12:19:46,300 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:19:46,300 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 12:19:46,300 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 12:19:46,300 INFO  L87              Difference]: Start difference. First operand 30868 states and 47285 transitions. Second operand 4 states.