/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-eb0fd7c
[2020-09-21 10:32:45,993 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-21 10:32:45,997 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-21 10:32:46,023 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-21 10:32:46,023 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-21 10:32:46,025 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-21 10:32:46,026 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-09-21 10:32:46,034 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-21 10:32:46,036 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-21 10:32:46,040 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-21 10:32:46,043 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-21 10:32:46,044 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-21 10:32:46,046 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-21 10:32:46,050 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-21 10:32:46,056 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-21 10:32:46,061 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-21 10:32:46,065 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-21 10:32:46,066 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-21 10:32:46,068 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-21 10:32:46,073 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-21 10:32:46,073 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-21 10:32:46,074 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-21 10:32:46,077 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-21 10:32:46,078 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-21 10:32:46,081 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-21 10:32:46,082 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-21 10:32:46,083 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
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[2020-09-21 10:32:46,086 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-21 10:32:46,087 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-09-21 10:32:46,088 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-09-21 10:32:46,091 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-21 10:32:46,092 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
[2020-09-21 10:32:46,155 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-21 10:32:46,156 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-21 10:32:46,160 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-21 10:32:46,160 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-21 10:32:46,160 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-21 10:32:46,161 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-21 10:32:46,161 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-21 10:32:46,161 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-21 10:32:46,161 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-21 10:32:46,161 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-21 10:32:46,162 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-21 10:32:46,162 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-21 10:32:46,162 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-21 10:32:46,162 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-21 10:32:46,162 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-21 10:32:46,163 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-21 10:32:46,164 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-21 10:32:46,164 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-21 10:32:46,164 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-21 10:32:46,165 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-21 10:32:46,165 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-21 10:32:46,165 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-21 10:32:46,165 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-21 10:32:46,165 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-21 10:32:46,166 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-21 10:32:46,166 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-21 10:32:46,166 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-21 10:32:46,166 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-21 10:32:46,166 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-21 10:32:46,166 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 -> false
[2020-09-21 10:32:46,667 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-21 10:32:46,688 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-21 10:32:46,692 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-21 10:32:46,694 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-21 10:32:46,695 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-21 10:32:46,696 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:46,790 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fdfd23468/fc40e5fb9d754d7c8ce7fb32ba471c57/FLAGb3c46e36e
[2020-09-21 10:32:47,588 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-21 10:32:47,591 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:47,613 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fdfd23468/fc40e5fb9d754d7c8ce7fb32ba471c57/FLAGb3c46e36e
[2020-09-21 10:32:47,735 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fdfd23468/fc40e5fb9d754d7c8ce7fb32ba471c57
[2020-09-21 10:32:47,749 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-21 10:32:47,755 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-21 10:32:47,756 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-21 10:32:47,756 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-21 10:32:47,761 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-21 10:32:47,762 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:47" (1/1) ...
[2020-09-21 10:32:47,766 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@187bf361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:47, skipping insertion in model container
[2020-09-21 10:32:47,766 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:47" (1/1) ...
[2020-09-21 10:32:47,775 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-21 10:32:47,889 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-21 10:32:48,923 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-21 10:32:48,947 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-21 10:32:49,462 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-21 10:32:49,488 INFO  L208         MainTranslator]: Completed translation
[2020-09-21 10:32:49,488 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49 WrapperNode
[2020-09-21 10:32:49,488 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-21 10:32:49,489 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-21 10:32:49,490 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-21 10:32:49,490 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-21 10:32:49,508 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,509 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,540 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,541 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,608 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,683 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,704 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (1/1) ...
[2020-09-21 10:32:49,732 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-21 10:32:49,733 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-21 10:32:49,733 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-21 10:32:49,733 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-21 10:32:49,735 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (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
[2020-09-21 10:32:49,833 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-21 10:32:49,834 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-21 10:32:49,834 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-09-21 10:32:49,834 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-21 10:32:49,835 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-21 10:32:49,835 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-09-21 10:32:49,836 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-09-21 10:32:49,836 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-09-21 10:32:49,836 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-09-21 10:32:49,837 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-09-21 10:32:49,837 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-09-21 10:32:49,838 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-09-21 10:32:49,838 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-09-21 10:32:49,839 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-09-21 10:32:49,839 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-09-21 10:32:49,841 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-09-21 10:32:49,842 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-09-21 10:32:49,842 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-09-21 10:32:49,842 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-21 10:32:49,842 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-21 10:32:49,843 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-21 10:32:52,323 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-21 10:32:52,324 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-09-21 10:32:52,334 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:52 BoogieIcfgContainer
[2020-09-21 10:32:52,334 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-21 10:32:52,336 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-21 10:32:52,336 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-21 10:32:52,340 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-21 10:32:52,340 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:32:47" (1/3) ...
[2020-09-21 10:32:52,341 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72bbb7e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:52, skipping insertion in model container
[2020-09-21 10:32:52,341 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:49" (2/3) ...
[2020-09-21 10:32:52,342 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72bbb7e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:52, skipping insertion in model container
[2020-09-21 10:32:52,342 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:52" (3/3) ...
[2020-09-21 10:32:52,344 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c
[2020-09-21 10:32:52,356 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-21 10:32:52,367 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-21 10:32:52,390 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-21 10:32:52,425 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-21 10:32:52,425 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-21 10:32:52,425 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-21 10:32:52,425 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-21 10:32:52,426 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-21 10:32:52,426 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-21 10:32:52,426 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-21 10:32:52,426 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-21 10:32:52,465 INFO  L276                IsEmpty]: Start isEmpty. Operand 795 states.
[2020-09-21 10:32:52,497 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 325
[2020-09-21 10:32:52,498 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:32:52,499 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-21 10:32:52,500 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:32:52,507 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:32:52,508 INFO  L82        PathProgramCache]: Analyzing trace with hash -2046950044, now seen corresponding path program 1 times
[2020-09-21 10:32:52,520 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:32:52,520 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792675160]
[2020-09-21 10:32:52,521 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:32:53,656 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:55,035 WARN  L193               SmtUtils]: Spent 830.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-09-21 10:32:55,042 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:32:55,057 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:32:55,407 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:32:55,409 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792675160]
[2020-09-21 10:32:55,411 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:32:55,412 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-09-21 10:32:55,413 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795739028]
[2020-09-21 10:32:55,422 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-21 10:32:55,423 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:32:55,441 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-21 10:32:55,442 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-09-21 10:32:55,445 INFO  L87              Difference]: Start difference. First operand 795 states. Second operand 5 states.
[2020-09-21 10:33:04,219 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:33:04,220 INFO  L93              Difference]: Finished difference Result 2333 states and 4147 transitions.
[2020-09-21 10:33:04,220 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-21 10:33:04,223 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 324
[2020-09-21 10:33:04,224 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:33:04,258 INFO  L225             Difference]: With dead ends: 2333
[2020-09-21 10:33:04,259 INFO  L226             Difference]: Without dead ends: 1545
[2020-09-21 10:33:04,269 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-09-21 10:33:04,293 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1545 states.
[2020-09-21 10:33:04,417 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1545 to 1543.
[2020-09-21 10:33:04,419 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1543 states.
[2020-09-21 10:33:04,427 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1543 states to 1543 states and 2401 transitions.
[2020-09-21 10:33:04,429 INFO  L78                 Accepts]: Start accepts. Automaton has 1543 states and 2401 transitions. Word has length 324
[2020-09-21 10:33:04,430 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:33:04,430 INFO  L479      AbstractCegarLoop]: Abstraction has 1543 states and 2401 transitions.
[2020-09-21 10:33:04,430 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-21 10:33:04,431 INFO  L276                IsEmpty]: Start isEmpty. Operand 1543 states and 2401 transitions.
[2020-09-21 10:33:04,441 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-09-21 10:33:04,441 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:33:04,442 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]
[2020-09-21 10:33:04,442 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-21 10:33:04,442 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:33:04,443 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:33:04,443 INFO  L82        PathProgramCache]: Analyzing trace with hash 1516440759, now seen corresponding path program 1 times
[2020-09-21 10:33:04,443 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:33:04,443 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967231776]
[2020-09-21 10:33:04,444 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:33:04,564 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:05,385 WARN  L193               SmtUtils]: Spent 580.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-09-21 10:33:05,387 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:33:05,395 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:05,699 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:33:05,699 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967231776]
[2020-09-21 10:33:05,700 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:33:05,700 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:33:05,700 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372222843]
[2020-09-21 10:33:05,703 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:33:05,703 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:33:05,703 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:33:05,704 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:05,704 INFO  L87              Difference]: Start difference. First operand 1543 states and 2401 transitions. Second operand 4 states.
[2020-09-21 10:33:15,352 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:33:15,353 INFO  L93              Difference]: Finished difference Result 4438 states and 6875 transitions.
[2020-09-21 10:33:15,353 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-09-21 10:33:15,353 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-09-21 10:33:15,355 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:33:15,370 INFO  L225             Difference]: With dead ends: 4438
[2020-09-21 10:33:15,370 INFO  L226             Difference]: Without dead ends: 3024
[2020-09-21 10:33:15,374 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:15,379 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3024 states.
[2020-09-21 10:33:15,496 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3024 to 3022.
[2020-09-21 10:33:15,497 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3022 states.
[2020-09-21 10:33:15,507 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3022 states to 3022 states and 4679 transitions.
[2020-09-21 10:33:15,508 INFO  L78                 Accepts]: Start accepts. Automaton has 3022 states and 4679 transitions. Word has length 326
[2020-09-21 10:33:15,508 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:33:15,509 INFO  L479      AbstractCegarLoop]: Abstraction has 3022 states and 4679 transitions.
[2020-09-21 10:33:15,509 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-09-21 10:33:15,509 INFO  L276                IsEmpty]: Start isEmpty. Operand 3022 states and 4679 transitions.
[2020-09-21 10:33:15,519 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-09-21 10:33:15,519 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:33:15,519 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]
[2020-09-21 10:33:15,520 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-21 10:33:15,520 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:33:15,520 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:33:15,521 INFO  L82        PathProgramCache]: Analyzing trace with hash -545695684, now seen corresponding path program 1 times
[2020-09-21 10:33:15,521 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:33:15,521 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277243307]
[2020-09-21 10:33:15,522 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:33:15,589 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:16,166 WARN  L193               SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-09-21 10:33:16,168 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:33:16,174 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:16,324 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:33:16,326 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277243307]
[2020-09-21 10:33:16,335 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:33:16,335 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:33:16,336 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130494274]
[2020-09-21 10:33:16,337 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:33:16,338 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:33:16,338 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:33:16,338 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:16,339 INFO  L87              Difference]: Start difference. First operand 3022 states and 4679 transitions. Second operand 4 states.
[2020-09-21 10:33:25,541 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:33:25,542 INFO  L93              Difference]: Finished difference Result 8991 states and 13913 transitions.
[2020-09-21 10:33:25,543 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-09-21 10:33:25,543 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-09-21 10:33:25,543 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:33:25,571 INFO  L225             Difference]: With dead ends: 8991
[2020-09-21 10:33:25,571 INFO  L226             Difference]: Without dead ends: 6011
[2020-09-21 10:33:25,577 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:25,585 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6011 states.
[2020-09-21 10:33:25,725 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6011 to 3041.
[2020-09-21 10:33:25,725 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3041 states.
[2020-09-21 10:33:25,734 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3041 states to 3041 states and 4707 transitions.
[2020-09-21 10:33:25,734 INFO  L78                 Accepts]: Start accepts. Automaton has 3041 states and 4707 transitions. Word has length 326
[2020-09-21 10:33:25,734 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:33:25,735 INFO  L479      AbstractCegarLoop]: Abstraction has 3041 states and 4707 transitions.
[2020-09-21 10:33:25,735 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-09-21 10:33:25,735 INFO  L276                IsEmpty]: Start isEmpty. Operand 3041 states and 4707 transitions.
[2020-09-21 10:33:25,745 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 328
[2020-09-21 10:33:25,745 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:33:25,746 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-21 10:33:25,746 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-09-21 10:33:25,747 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:33:25,747 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:33:25,747 INFO  L82        PathProgramCache]: Analyzing trace with hash -441096328, now seen corresponding path program 1 times
[2020-09-21 10:33:25,747 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:33:25,749 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323477331]
[2020-09-21 10:33:25,749 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:33:25,825 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:26,436 WARN  L193               SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-09-21 10:33:26,438 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:33:26,450 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:26,578 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:33:26,579 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323477331]
[2020-09-21 10:33:26,579 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:33:26,579 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:33:26,580 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121865693]
[2020-09-21 10:33:26,580 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:33:26,580 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:33:26,581 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:33:26,581 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:26,581 INFO  L87              Difference]: Start difference. First operand 3041 states and 4707 transitions. Second operand 4 states.
[2020-09-21 10:33:35,582 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-21 10:33:35,583 INFO  L93              Difference]: Finished difference Result 9010 states and 13934 transitions.
[2020-09-21 10:33:35,584 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-09-21 10:33:35,584 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 327
[2020-09-21 10:33:35,584 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-21 10:33:35,609 INFO  L225             Difference]: With dead ends: 9010
[2020-09-21 10:33:35,609 INFO  L226             Difference]: Without dead ends: 6029
[2020-09-21 10:33:35,616 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:35,623 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6029 states.
[2020-09-21 10:33:35,777 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6029 to 3059.
[2020-09-21 10:33:35,778 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3059 states.
[2020-09-21 10:33:35,784 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3059 states to 3059 states and 4728 transitions.
[2020-09-21 10:33:35,784 INFO  L78                 Accepts]: Start accepts. Automaton has 3059 states and 4728 transitions. Word has length 327
[2020-09-21 10:33:35,784 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-21 10:33:35,785 INFO  L479      AbstractCegarLoop]: Abstraction has 3059 states and 4728 transitions.
[2020-09-21 10:33:35,785 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-09-21 10:33:35,785 INFO  L276                IsEmpty]: Start isEmpty. Operand 3059 states and 4728 transitions.
[2020-09-21 10:33:35,793 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-09-21 10:33:35,794 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-21 10:33:35,794 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]
[2020-09-21 10:33:35,795 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-09-21 10:33:35,795 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-21 10:33:35,796 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-21 10:33:35,796 INFO  L82        PathProgramCache]: Analyzing trace with hash -1648776142, now seen corresponding path program 1 times
[2020-09-21 10:33:35,796 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-21 10:33:35,797 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346605610]
[2020-09-21 10:33:35,797 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-21 10:33:35,981 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:36,675 WARN  L193               SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 283
[2020-09-21 10:33:36,677 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-21 10:33:36,683 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-21 10:33:36,887 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-21 10:33:36,887 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346605610]
[2020-09-21 10:33:36,887 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-21 10:33:36,887 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-09-21 10:33:36,888 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149128112]
[2020-09-21 10:33:36,890 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-09-21 10:33:36,890 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-21 10:33:36,890 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-09-21 10:33:36,890 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-09-21 10:33:36,891 INFO  L87              Difference]: Start difference. First operand 3059 states and 4728 transitions. Second operand 4 states.