/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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --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.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 16:42:33,787 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 16:42:33,790 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 16:42:33,813 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 16:42:33,813 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 16:42:33,815 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 16:42:33,816 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 16:42:33,818 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
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[2020-08-21 16:42:33,823 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 16:42:33,823 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 16:42:33,824 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 16:42:33,825 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 16:42:33,826 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 16:42:33,827 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 16:42:33,829 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 16:42:33,830 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 16:42:33,832 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 16:42:33,833 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 16:42:33,834 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 16:42:33,835 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 16:42:33,837 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 16:42:33,838 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 16:42:33,838 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 16:42:33,839 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 16:42:33,839 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 16:42:33,840 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 16:42:33,840 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 16:42:33,841 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 16:42:33,841 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 16:42:33,842 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 16:42:33,843 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 16:42:33,844 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 16:42:33,844 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 16:42:33,844 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 16:42:33,845 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-21 16:42:33,846 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 16:42:33,847 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 16:42:33,871 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 16:42:33,871 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 16:42:33,872 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 16:42:33,872 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 16:42:33,876 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 16:42:33,876 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 16:42:33,876 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 16:42:33,876 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 16:42:33,876 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 16:42:33,876 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 16:42:33,877 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 16:42:33,877 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 16:42:33,877 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 16:42:33,877 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 16:42:33,877 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 16:42:33,878 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 16:42:33,878 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 16:42:33,878 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 16:42:33,878 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 16:42:33,878 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 16:42:33,878 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 16:42:33,879 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 16:42:33,879 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 16:42:33,879 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 16:42:33,879 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 16:42:33,879 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 16:42:33,879 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 16:42:33,880 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 16:42:33,880 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 16:42:33,880 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true;
[2020-08-21 16:42:34,161 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 16:42:34,179 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 16:42:34,182 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 16:42:34,183 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 16:42:34,183 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 16:42:34,184 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 16:42:34,245 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a6c7eafd/04eaddb9d2cd4b6788d8d1775c2e4b65/FLAGe6404eab3
[2020-08-21 16:42:34,820 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 16:42:34,821 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 16:42:34,844 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a6c7eafd/04eaddb9d2cd4b6788d8d1775c2e4b65/FLAGe6404eab3
[2020-08-21 16:42:35,025 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a6c7eafd/04eaddb9d2cd4b6788d8d1775c2e4b65
[2020-08-21 16:42:35,034 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 16:42:35,036 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 16:42:35,038 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 16:42:35,038 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 16:42:35,043 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 16:42:35,043 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:42:35" (1/1) ...
[2020-08-21 16:42:35,046 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40826058 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:35, skipping insertion in model container
[2020-08-21 16:42:35,047 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:42:35" (1/1) ...
[2020-08-21 16:42:35,055 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 16:42:35,179 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 16:42:36,269 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 16:42:36,285 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 16:42:36,713 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 16:42:36,735 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 16:42:36,736 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36 WrapperNode
[2020-08-21 16:42:36,736 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 16:42:36,737 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 16:42:36,737 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 16:42:36,737 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 16:42:36,751 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,751 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,780 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,780 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,832 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,864 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,877 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (1/1) ...
[2020-08-21 16:42:36,903 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 16:42:36,904 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 16:42:36,904 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 16:42:36,904 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 16:42:36,906 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (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 16:42:37,008 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 16:42:37,008 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 16:42:37,009 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 16:42:37,010 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 16:42:37,010 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 16:42:37,010 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 16:42:37,010 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 16:42:37,010 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 16:42:37,011 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 16:42:37,012 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 16:42:37,013 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 16:42:37,013 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 16:42:37,013 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 16:42:37,013 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 16:42:37,014 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 16:42:37,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 16:42:37,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 16:42:37,016 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 16:42:37,016 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 16:42:37,016 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 16:42:37,017 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 16:42:37,017 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 16:42:39,972 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 16:42:39,972 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 16:42:39,984 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:42:39 BoogieIcfgContainer
[2020-08-21 16:42:39,984 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 16:42:39,985 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 16:42:39,986 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 16:42:39,992 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 16:42:39,992 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:42:35" (1/3) ...
[2020-08-21 16:42:39,993 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bcaea3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:42:39, skipping insertion in model container
[2020-08-21 16:42:39,993 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:42:36" (2/3) ...
[2020-08-21 16:42:39,994 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bcaea3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:42:39, skipping insertion in model container
[2020-08-21 16:42:39,994 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:42:39" (3/3) ...
[2020-08-21 16:42:39,996 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 16:42:40,008 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 16:42:40,019 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 16:42:40,034 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 16:42:40,066 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 16:42:40,067 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 16:42:40,067 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 16:42:40,067 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 16:42:40,067 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 16:42:40,067 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 16:42:40,068 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 16:42:40,068 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 16:42:40,103 INFO  L276                IsEmpty]: Start isEmpty. Operand 789 states.
[2020-08-21 16:42:40,132 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 16:42:40,132 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:42:40,134 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 16:42:40,134 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:42:40,141 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:42:40,142 INFO  L82        PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times
[2020-08-21 16:42:40,152 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:42:40,152 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822397938]
[2020-08-21 16:42:40,153 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:42:41,008 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:41,988 WARN  L193               SmtUtils]: Spent 534.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:42:41,991 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:42:41,999 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:42,172 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 16:42:42,173 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822397938]
[2020-08-21 16:42:42,175 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:42:42,176 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:42:42,177 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156390353]
[2020-08-21 16:42:42,183 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:42:42,183 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:42:42,198 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:42:42,199 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:42:42,202 INFO  L87              Difference]: Start difference. First operand 789 states. Second operand 4 states.
[2020-08-21 16:42:42,687 WARN  L193               SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 16:42:47,794 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:42:47,794 INFO  L93              Difference]: Finished difference Result 1489 states and 2621 transitions.
[2020-08-21 16:42:47,795 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 16:42:47,797 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-21 16:42:47,799 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:42:47,828 INFO  L225             Difference]: With dead ends: 1489
[2020-08-21 16:42:47,828 INFO  L226             Difference]: Without dead ends: 1273
[2020-08-21 16:42:47,833 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 16:42:47,851 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1273 states.
[2020-08-21 16:42:47,964 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271.
[2020-08-21 16:42:47,965 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1271 states.
[2020-08-21 16:42:47,973 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions.
[2020-08-21 16:42:47,975 INFO  L78                 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326
[2020-08-21 16:42:47,976 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:42:47,977 INFO  L479      AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions.
[2020-08-21 16:42:47,977 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 16:42:47,977 INFO  L276                IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions.
[2020-08-21 16:42:47,983 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 16:42:47,984 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:42:47,984 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 16:42:47,985 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 16:42:47,985 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:42:47,985 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:42:47,986 INFO  L82        PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times
[2020-08-21 16:42:47,986 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:42:47,986 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690840187]
[2020-08-21 16:42:47,987 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:42:48,178 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:48,907 WARN  L193               SmtUtils]: Spent 458.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:42:48,909 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:42:48,918 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:49,169 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 16:42:49,170 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690840187]
[2020-08-21 16:42:49,171 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:42:49,171 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:42:49,171 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001497891]
[2020-08-21 16:42:49,175 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:42:49,176 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:42:49,176 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:42:49,176 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:42:49,177 INFO  L87              Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states.
[2020-08-21 16:42:49,865 WARN  L193               SmtUtils]: Spent 628.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 16:42:54,234 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:42:54,235 INFO  L93              Difference]: Finished difference Result 2607 states and 4089 transitions.
[2020-08-21 16:42:54,241 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 16:42:54,241 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-21 16:42:54,242 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:42:54,254 INFO  L225             Difference]: With dead ends: 2607
[2020-08-21 16:42:54,254 INFO  L226             Difference]: Without dead ends: 2225
[2020-08-21 16:42:54,259 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 16:42:54,262 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2225 states.
[2020-08-21 16:42:54,328 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223.
[2020-08-21 16:42:54,329 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2223 states.
[2020-08-21 16:42:54,338 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions.
[2020-08-21 16:42:54,339 INFO  L78                 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326
[2020-08-21 16:42:54,340 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:42:54,340 INFO  L479      AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions.
[2020-08-21 16:42:54,340 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 16:42:54,340 INFO  L276                IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions.
[2020-08-21 16:42:54,347 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 16:42:54,347 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:42:54,348 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 16:42:54,348 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 16:42:54,348 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:42:54,349 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:42:54,349 INFO  L82        PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times
[2020-08-21 16:42:54,349 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:42:54,349 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [568124452]
[2020-08-21 16:42:54,350 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:42:54,517 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:55,143 WARN  L193               SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:42:55,145 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:42:55,150 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:42:55,260 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 16:42:55,261 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [568124452]
[2020-08-21 16:42:55,261 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:42:55,261 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:42:55,262 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679014833]
[2020-08-21 16:42:55,262 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:42:55,263 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:42:55,263 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:42:55,263 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:42:55,264 INFO  L87              Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states.
[2020-08-21 16:42:55,708 WARN  L193               SmtUtils]: Spent 399.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 16:43:00,073 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:43:00,074 INFO  L93              Difference]: Finished difference Result 4715 states and 7386 transitions.
[2020-08-21 16:43:00,074 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 16:43:00,075 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-21 16:43:00,076 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:43:00,099 INFO  L225             Difference]: With dead ends: 4715
[2020-08-21 16:43:00,099 INFO  L226             Difference]: Without dead ends: 4049
[2020-08-21 16:43:00,103 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
[2020-08-21 16:43:00,111 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4049 states.
[2020-08-21 16:43:00,285 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047.
[2020-08-21 16:43:00,286 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4047 states.
[2020-08-21 16:43:00,304 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions.
[2020-08-21 16:43:00,304 INFO  L78                 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326
[2020-08-21 16:43:00,305 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:43:00,306 INFO  L479      AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions.
[2020-08-21 16:43:00,306 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 16:43:00,306 INFO  L276                IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions.
[2020-08-21 16:43:00,323 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-21 16:43:00,323 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:43:00,324 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 16:43:00,324 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 16:43:00,324 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:43:00,325 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:43:00,325 INFO  L82        PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times
[2020-08-21 16:43:00,326 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:43:00,326 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45423297]
[2020-08-21 16:43:00,327 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:43:00,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:01,493 WARN  L193               SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:43:01,494 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:43:01,500 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:01,724 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 16:43:01,724 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45423297]
[2020-08-21 16:43:01,725 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:43:01,725 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 16:43:01,725 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747604526]
[2020-08-21 16:43:01,726 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 16:43:01,726 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:43:01,727 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 16:43:01,727 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 16:43:01,727 INFO  L87              Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states.
[2020-08-21 16:43:08,415 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:43:08,415 INFO  L93              Difference]: Finished difference Result 11998 states and 18565 transitions.
[2020-08-21 16:43:08,416 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 16:43:08,416 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 326
[2020-08-21 16:43:08,417 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:43:08,456 INFO  L225             Difference]: With dead ends: 11998
[2020-08-21 16:43:08,457 INFO  L226             Difference]: Without dead ends: 7966
[2020-08-21 16:43:08,467 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 16:43:08,478 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7966 states.
[2020-08-21 16:43:08,835 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964.
[2020-08-21 16:43:08,836 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7964 states.
[2020-08-21 16:43:08,865 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions.
[2020-08-21 16:43:08,865 INFO  L78                 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326
[2020-08-21 16:43:08,866 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:43:08,866 INFO  L479      AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions.
[2020-08-21 16:43:08,866 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 16:43:08,866 INFO  L276                IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions.
[2020-08-21 16:43:08,886 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-21 16:43:08,887 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:43:08,887 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 16:43:08,888 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 16:43:08,888 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:43:08,888 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:43:08,889 INFO  L82        PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times
[2020-08-21 16:43:08,889 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:43:08,889 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736952701]
[2020-08-21 16:43:08,889 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:43:08,986 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:09,488 WARN  L193               SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:43:09,490 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:43:09,496 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:09,607 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 16:43:09,608 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736952701]
[2020-08-21 16:43:09,608 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:43:09,608 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:43:09,609 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45052276]
[2020-08-21 16:43:09,609 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:43:09,609 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:43:09,609 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:43:09,610 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:43:09,610 INFO  L87              Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states.
[2020-08-21 16:43:17,121 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:43:17,121 INFO  L93              Difference]: Finished difference Result 23441 states and 36046 transitions.
[2020-08-21 16:43:17,122 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 16:43:17,122 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-21 16:43:17,123 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:43:17,183 INFO  L225             Difference]: With dead ends: 23441
[2020-08-21 16:43:17,183 INFO  L226             Difference]: Without dead ends: 15606
[2020-08-21 16:43:17,201 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
[2020-08-21 16:43:17,225 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15606 states.
[2020-08-21 16:43:17,731 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604.
[2020-08-21 16:43:17,731 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15604 states.
[2020-08-21 16:43:17,764 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions.
[2020-08-21 16:43:17,765 INFO  L78                 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328
[2020-08-21 16:43:17,766 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:43:17,766 INFO  L479      AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions.
[2020-08-21 16:43:17,766 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 16:43:17,766 INFO  L276                IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions.
[2020-08-21 16:43:18,385 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-21 16:43:18,385 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:43:18,386 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 16:43:18,386 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 16:43:18,386 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:43:18,389 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:43:18,390 INFO  L82        PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times
[2020-08-21 16:43:18,390 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:43:18,391 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727461342]
[2020-08-21 16:43:18,391 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:43:18,434 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:18,878 WARN  L193               SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:43:18,879 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:43:18,884 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:18,965 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 16:43:18,965 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727461342]
[2020-08-21 16:43:18,965 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:43:18,966 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:43:18,966 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989909271]
[2020-08-21 16:43:18,967 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:43:18,967 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:43:18,967 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:43:18,967 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:43:18,968 INFO  L87              Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states.
[2020-08-21 16:43:26,764 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 16:43:26,764 INFO  L93              Difference]: Finished difference Result 46737 states and 71555 transitions.
[2020-08-21 16:43:26,765 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 16:43:26,765 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-21 16:43:26,766 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 16:43:26,833 INFO  L225             Difference]: With dead ends: 46737
[2020-08-21 16:43:26,833 INFO  L226             Difference]: Without dead ends: 31175
[2020-08-21 16:43:26,867 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
[2020-08-21 16:43:26,907 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31175 states.
[2020-08-21 16:43:27,594 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623.
[2020-08-21 16:43:27,595 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15623 states.
[2020-08-21 16:43:27,621 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions.
[2020-08-21 16:43:27,621 INFO  L78                 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328
[2020-08-21 16:43:27,621 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 16:43:27,622 INFO  L479      AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions.
[2020-08-21 16:43:27,622 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 16:43:27,622 INFO  L276                IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions.
[2020-08-21 16:43:27,649 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 330
[2020-08-21 16:43:27,649 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 16:43:27,649 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 16:43:27,650 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 16:43:27,650 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 16:43:27,650 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 16:43:27,650 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times
[2020-08-21 16:43:27,651 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 16:43:27,651 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705796905]
[2020-08-21 16:43:27,651 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 16:43:27,687 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:28,134 WARN  L193               SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 16:43:28,135 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 16:43:28,141 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 16:43:28,287 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 16:43:28,287 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705796905]
[2020-08-21 16:43:28,287 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 16:43:28,288 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 16:43:28,288 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519036381]
[2020-08-21 16:43:28,289 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 16:43:28,289 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 16:43:28,289 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 16:43:28,289 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 16:43:28,289 INFO  L87              Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.