/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 interpolation-heuristic=FIRST --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.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 15:05:54,406 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 15:05:54,409 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 15:05:54,433 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 15:05:54,434 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 15:05:54,435 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 15:05:54,436 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 15:05:54,438 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 15:05:54,440 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 15:05:54,440 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 15:05:54,441 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 15:05:54,443 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 15:05:54,443 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 15:05:54,444 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 15:05:54,445 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 15:05:54,446 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 15:05:54,447 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 15:05:54,450 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 15:05:54,453 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 15:05:54,455 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 15:05:54,458 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 15:05:54,461 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 15:05:54,462 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 15:05:54,465 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 15:05:54,470 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 15:05:54,470 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 15:05:54,470 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 15:05:54,472 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 15:05:54,475 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 15:05:54,476 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 15:05:54,476 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 15:05:54,477 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 15:05:54,479 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 15:05:54,480 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 15:05:54,482 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 15:05:54,482 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 15:05:54,483 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 15:05:54,483 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 15:05:54,484 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-21 15:05:54,486 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 15:05:54,487 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 15:05:54,523 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 15:05:54,523 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 15:05:54,525 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 15:05:54,525 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 15:05:54,525 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 15:05:54,525 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 15:05:54,526 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 15:05:54,526 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 15:05:54,526 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 15:05:54,526 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 15:05:54,526 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 15:05:54,527 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 15:05:54,528 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 15:05:54,528 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 15:05:54,528 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 15:05:54,528 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 15:05:54,529 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 15:05:54,529 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 15:05:54,529 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 15:05:54,529 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 15:05:54,529 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 15:05:54,530 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 15:05:54,530 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 15:05:54,530 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 15:05:54,530 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 -> interpolation-heuristic=FIRST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true;
[2020-08-21 15:05:54,845 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 15:05:54,856 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 15:05:54,860 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 15:05:54,861 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 15:05:54,862 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 15:05:54,862 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:54,928 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ae16c73a/5848224701884931be8d56ceffcd66e2/FLAG86cb68d07
[2020-08-21 15:05:55,582 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 15:05:55,583 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:05:55,602 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ae16c73a/5848224701884931be8d56ceffcd66e2/FLAG86cb68d07
[2020-08-21 15:05:55,839 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ae16c73a/5848224701884931be8d56ceffcd66e2
[2020-08-21 15:05:55,847 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 15:05:55,848 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 15:05:55,849 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:55,850 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 15:05:55,853 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 15:05:55,854 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:55" (1/1) ...
[2020-08-21 15:05:55,857 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20fc4f96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:55, skipping insertion in model container
[2020-08-21 15:05:55,857 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:05:55" (1/1) ...
[2020-08-21 15:05:55,865 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 15:05:55,972 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 15:05:56,990 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:57,014 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 15:05:57,574 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 15:05:57,617 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 15:05:57,618 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57 WrapperNode
[2020-08-21 15:05:57,618 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 15:05:57,619 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 15:05:57,619 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 15:05:57,619 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 15:05:57,639 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,641 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,697 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,701 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,756 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,779 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,787 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (1/1) ...
[2020-08-21 15:05:57,801 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 15:05:57,802 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 15:05:57,802 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 15:05:57,802 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 15:05:57,803 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (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 15:05:57,905 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 15:05:57,906 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 15:05:57,906 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 15:05:57,906 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 15:05:57,907 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 15:05:57,907 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 15:05:57,907 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 15:05:57,907 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 15:05:57,907 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 15:05:57,908 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 15:05:57,908 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 15:05:57,908 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 15:05:57,908 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 15:05:57,909 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 15:05:57,909 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 15:05:57,909 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 15:05:57,909 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 15:05:57,909 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 15:05:57,910 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 15:05:57,910 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 15:05:57,911 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 15:05:57,911 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 15:06:00,532 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 15:06:00,532 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 15:06:00,542 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:06:00 BoogieIcfgContainer
[2020-08-21 15:06:00,543 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 15:06:00,544 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 15:06:00,544 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 15:06:00,547 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 15:06:00,547 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:05:55" (1/3) ...
[2020-08-21 15:06:00,548 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@474825ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:06:00, skipping insertion in model container
[2020-08-21 15:06:00,548 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:05:57" (2/3) ...
[2020-08-21 15:06:00,549 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@474825ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:06:00, skipping insertion in model container
[2020-08-21 15:06:00,549 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:06:00" (3/3) ...
[2020-08-21 15:06:00,551 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 15:06:00,561 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 15:06:00,570 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 15:06:00,581 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 15:06:00,608 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 15:06:00,609 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 15:06:00,609 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 15:06:00,609 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 15:06:00,609 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 15:06:00,609 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 15:06:00,609 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 15:06:00,610 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 15:06:00,642 INFO  L276                IsEmpty]: Start isEmpty. Operand 808 states.
[2020-08-21 15:06:00,671 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 15:06:00,672 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:00,673 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:00,674 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:00,679 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:00,680 INFO  L82        PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times
[2020-08-21 15:06:00,689 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:00,689 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051644253]
[2020-08-21 15:06:00,690 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:01,446 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:02,284 WARN  L193               SmtUtils]: Spent 471.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:02,287 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:02,294 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:02,479 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 15:06:02,481 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051644253]
[2020-08-21 15:06:02,483 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:02,483 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:02,484 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296819379]
[2020-08-21 15:06:02,493 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:02,494 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:02,508 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:02,509 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:02,511 INFO  L87              Difference]: Start difference. First operand 808 states. Second operand 4 states.
[2020-08-21 15:06:02,998 WARN  L193               SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:08,098 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:08,099 INFO  L93              Difference]: Finished difference Result 1527 states and 2683 transitions.
[2020-08-21 15:06:08,100 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:08,101 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 15:06:08,104 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:08,151 INFO  L225             Difference]: With dead ends: 1527
[2020-08-21 15:06:08,151 INFO  L226             Difference]: Without dead ends: 1311
[2020-08-21 15:06:08,158 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 15:06:08,176 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1311 states.
[2020-08-21 15:06:08,306 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309.
[2020-08-21 15:06:08,308 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1309 states.
[2020-08-21 15:06:08,315 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions.
[2020-08-21 15:06:08,317 INFO  L78                 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330
[2020-08-21 15:06:08,322 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:08,323 INFO  L479      AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions.
[2020-08-21 15:06:08,323 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:08,323 INFO  L276                IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions.
[2020-08-21 15:06:08,336 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 15:06:08,336 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:08,337 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:08,337 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 15:06:08,337 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:08,337 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:08,338 INFO  L82        PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times
[2020-08-21 15:06:08,338 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:08,338 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831147844]
[2020-08-21 15:06:08,339 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:08,542 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:09,294 WARN  L193               SmtUtils]: Spent 527.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:09,296 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:09,304 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:09,587 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 15:06:09,588 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831147844]
[2020-08-21 15:06:09,589 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:09,589 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:09,590 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591941200]
[2020-08-21 15:06:09,592 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:09,592 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:09,593 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:09,593 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:09,594 INFO  L87              Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 4 states.
[2020-08-21 15:06:10,326 WARN  L193               SmtUtils]: Spent 678.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:14,863 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:14,864 INFO  L93              Difference]: Finished difference Result 2683 states and 4213 transitions.
[2020-08-21 15:06:14,864 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:14,865 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 15:06:14,866 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:14,882 INFO  L225             Difference]: With dead ends: 2683
[2020-08-21 15:06:14,882 INFO  L226             Difference]: Without dead ends: 2301
[2020-08-21 15:06:14,886 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 15:06:14,892 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2301 states.
[2020-08-21 15:06:14,985 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299.
[2020-08-21 15:06:14,986 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2299 states.
[2020-08-21 15:06:15,004 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions.
[2020-08-21 15:06:15,004 INFO  L78                 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330
[2020-08-21 15:06:15,005 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:15,006 INFO  L479      AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions.
[2020-08-21 15:06:15,006 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:15,006 INFO  L276                IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions.
[2020-08-21 15:06:15,022 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 15:06:15,024 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:15,028 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:15,029 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 15:06:15,029 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:15,029 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:15,030 INFO  L82        PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times
[2020-08-21 15:06:15,030 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:15,031 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160242202]
[2020-08-21 15:06:15,032 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:15,460 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:16,099 WARN  L193               SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:16,101 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:16,107 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:16,256 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 15:06:16,256 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160242202]
[2020-08-21 15:06:16,257 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:16,257 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:16,257 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975842861]
[2020-08-21 15:06:16,258 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:16,259 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:16,260 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:16,260 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:16,260 INFO  L87              Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 4 states.
[2020-08-21 15:06:16,707 WARN  L193               SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 15:06:20,730 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:20,731 INFO  L93              Difference]: Finished difference Result 4867 states and 7634 transitions.
[2020-08-21 15:06:20,731 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:20,731 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 15:06:20,732 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:20,753 INFO  L225             Difference]: With dead ends: 4867
[2020-08-21 15:06:20,753 INFO  L226             Difference]: Without dead ends: 4201
[2020-08-21 15:06:20,756 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 15:06:20,762 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4201 states.
[2020-08-21 15:06:20,880 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199.
[2020-08-21 15:06:20,880 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4199 states.
[2020-08-21 15:06:20,894 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions.
[2020-08-21 15:06:20,895 INFO  L78                 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330
[2020-08-21 15:06:20,896 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:20,896 INFO  L479      AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions.
[2020-08-21 15:06:20,896 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:20,896 INFO  L276                IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions.
[2020-08-21 15:06:20,911 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 15:06:20,911 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:20,912 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:20,912 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 15:06:20,912 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:20,913 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:20,913 INFO  L82        PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times
[2020-08-21 15:06:20,914 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:20,915 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232310418]
[2020-08-21 15:06:20,915 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:21,367 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:22,091 WARN  L193               SmtUtils]: Spent 467.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:22,094 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:22,101 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:22,516 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 15:06:22,517 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232310418]
[2020-08-21 15:06:22,518 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:22,519 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 15:06:22,519 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548273196]
[2020-08-21 15:06:22,520 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 15:06:22,520 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:22,521 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 15:06:22,521 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 15:06:22,522 INFO  L87              Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 5 states.
[2020-08-21 15:06:29,639 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:29,640 INFO  L93              Difference]: Finished difference Result 12414 states and 19245 transitions.
[2020-08-21 15:06:29,640 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 15:06:29,641 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 330
[2020-08-21 15:06:29,641 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:29,680 INFO  L225             Difference]: With dead ends: 12414
[2020-08-21 15:06:29,681 INFO  L226             Difference]: Without dead ends: 8230
[2020-08-21 15:06:29,691 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 15:06:29,700 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8230 states.
[2020-08-21 15:06:30,094 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8230 to 8228.
[2020-08-21 15:06:30,094 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8228 states.
[2020-08-21 15:06:30,125 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8228 states to 8228 states and 12694 transitions.
[2020-08-21 15:06:30,126 INFO  L78                 Accepts]: Start accepts. Automaton has 8228 states and 12694 transitions. Word has length 330
[2020-08-21 15:06:30,126 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:30,126 INFO  L479      AbstractCegarLoop]: Abstraction has 8228 states and 12694 transitions.
[2020-08-21 15:06:30,126 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 15:06:30,126 INFO  L276                IsEmpty]: Start isEmpty. Operand 8228 states and 12694 transitions.
[2020-08-21 15:06:30,146 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-21 15:06:30,146 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:30,147 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:30,147 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 15:06:30,148 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:30,148 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:30,148 INFO  L82        PathProgramCache]: Analyzing trace with hash 569689837, now seen corresponding path program 1 times
[2020-08-21 15:06:30,148 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:30,149 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848576294]
[2020-08-21 15:06:30,149 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:30,260 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:30,794 WARN  L193               SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:30,795 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:30,803 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:30,952 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 15:06:30,953 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848576294]
[2020-08-21 15:06:30,953 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:30,953 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:30,954 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728282214]
[2020-08-21 15:06:30,955 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:30,955 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:30,955 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:30,956 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:30,956 INFO  L87              Difference]: Start difference. First operand 8228 states and 12694 transitions. Second operand 4 states.
[2020-08-21 15:06:39,413 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:39,414 INFO  L93              Difference]: Finished difference Result 24233 states and 37318 transitions.
[2020-08-21 15:06:39,414 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 15:06:39,414 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-21 15:06:39,415 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:39,493 INFO  L225             Difference]: With dead ends: 24233
[2020-08-21 15:06:39,494 INFO  L226             Difference]: Without dead ends: 16134
[2020-08-21 15:06:39,510 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:39,528 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16134 states.
[2020-08-21 15:06:39,968 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16134 to 16132.
[2020-08-21 15:06:39,969 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16132 states.
[2020-08-21 15:06:39,997 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 24741 transitions.
[2020-08-21 15:06:39,997 INFO  L78                 Accepts]: Start accepts. Automaton has 16132 states and 24741 transitions. Word has length 332
[2020-08-21 15:06:39,998 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:39,998 INFO  L479      AbstractCegarLoop]: Abstraction has 16132 states and 24741 transitions.
[2020-08-21 15:06:39,998 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:39,998 INFO  L276                IsEmpty]: Start isEmpty. Operand 16132 states and 24741 transitions.
[2020-08-21 15:06:40,027 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-21 15:06:40,028 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:40,028 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:40,028 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 15:06:40,029 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:40,033 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:40,033 INFO  L82        PathProgramCache]: Analyzing trace with hash -310142286, now seen corresponding path program 1 times
[2020-08-21 15:06:40,034 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:40,034 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406904196]
[2020-08-21 15:06:40,034 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:40,070 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:41,164 WARN  L193               SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:41,165 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:41,171 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:41,300 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 15:06:41,301 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406904196]
[2020-08-21 15:06:41,302 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:41,310 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:41,310 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474123990]
[2020-08-21 15:06:41,311 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:41,311 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:41,311 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:41,312 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:41,312 INFO  L87              Difference]: Start difference. First operand 16132 states and 24741 transitions. Second operand 4 states.
[2020-08-21 15:06:49,710 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 15:06:49,710 INFO  L93              Difference]: Finished difference Result 48321 states and 74099 transitions.
[2020-08-21 15:06:49,711 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 15:06:49,711 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-21 15:06:49,711 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 15:06:49,775 INFO  L225             Difference]: With dead ends: 48321
[2020-08-21 15:06:49,775 INFO  L226             Difference]: Without dead ends: 32231
[2020-08-21 15:06:49,810 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:49,845 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 32231 states.
[2020-08-21 15:06:50,399 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 32231 to 16151.
[2020-08-21 15:06:50,400 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16151 states.
[2020-08-21 15:06:50,426 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16151 states to 16151 states and 24769 transitions.
[2020-08-21 15:06:50,426 INFO  L78                 Accepts]: Start accepts. Automaton has 16151 states and 24769 transitions. Word has length 332
[2020-08-21 15:06:50,426 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 15:06:50,426 INFO  L479      AbstractCegarLoop]: Abstraction has 16151 states and 24769 transitions.
[2020-08-21 15:06:50,427 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 15:06:50,427 INFO  L276                IsEmpty]: Start isEmpty. Operand 16151 states and 24769 transitions.
[2020-08-21 15:06:50,455 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 334
[2020-08-21 15:06:50,456 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 15:06:50,456 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 15:06:50,456 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 15:06:50,457 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 15:06:50,457 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 15:06:50,457 INFO  L82        PathProgramCache]: Analyzing trace with hash -1868318850, now seen corresponding path program 1 times
[2020-08-21 15:06:50,457 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 15:06:50,458 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184348045]
[2020-08-21 15:06:50,458 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 15:06:50,495 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:50,941 WARN  L193               SmtUtils]: Spent 364.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 15:06:50,942 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 15:06:50,948 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 15:06:51,033 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 15:06:51,034 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184348045]
[2020-08-21 15:06:51,034 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 15:06:51,034 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 15:06:51,034 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985085509]
[2020-08-21 15:06:51,035 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 15:06:51,035 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 15:06:51,035 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 15:06:51,036 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 15:06:51,036 INFO  L87              Difference]: Start difference. First operand 16151 states and 24769 transitions. Second operand 4 states.