/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 19:40:50,675 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 19:40:50,678 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 19:40:50,721 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 19:40:50,721 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 19:40:50,730 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 19:40:50,732 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 19:40:50,736 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 19:40:50,738 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
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[2020-08-18 19:40:50,743 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 19:40:50,743 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 19:40:50,746 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 19:40:50,748 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 19:40:50,749 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 19:40:50,751 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 19:40:50,752 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 19:40:50,753 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 19:40:50,761 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 19:40:50,763 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 19:40:50,764 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 19:40:50,765 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 19:40:50,766 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 19:40:50,778 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 19:40:50,778 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 19:40:50,778 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 19:40:50,780 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 19:40:50,780 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 19:40:50,782 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 19:40:50,783 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 19:40:50,783 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 19:40:50,784 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 19:40:50,785 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 19:40:50,786 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 19:40:50,786 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 19:40:50,787 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 19:40:50,787 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 19:40:50,787 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 19:40:50,789 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 19:40:50,790 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 19:40:50,820 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 19:40:50,820 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 19:40:50,822 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 19:40:50,822 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 19:40:50,822 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 19:40:50,822 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 19:40:50,822 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 19:40:50,823 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 19:40:50,823 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 19:40:50,823 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 19:40:50,823 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 19:40:50,823 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 19:40:50,824 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 19:40:50,824 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 19:40:50,824 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 19:40:50,824 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 19:40:50,824 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 19:40:50,825 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 19:40:50,825 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 19:40:50,825 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 19:40:50,825 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 19:40:50,825 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 19:40:50,826 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 19:40:50,826 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 19:40:50,826 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 19:40:50,826 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 19:40:50,826 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 19:40:50,827 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 19:40:50,827 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 19:40:50,827 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER;
[2020-08-18 19:40:51,139 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 19:40:51,154 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 19:40:51,156 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 19:40:51,157 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 19:40:51,158 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 19:40:51,158 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 19:40:51,221 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11187b3c9/074acb042c8c4167a5022cae3010400f/FLAGdf34c667a
[2020-08-18 19:40:51,973 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 19:40:51,975 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 19:40:52,003 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11187b3c9/074acb042c8c4167a5022cae3010400f/FLAGdf34c667a
[2020-08-18 19:40:52,096 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/11187b3c9/074acb042c8c4167a5022cae3010400f
[2020-08-18 19:40:52,105 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 19:40:52,106 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 19:40:52,107 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 19:40:52,108 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 19:40:52,111 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 19:40:52,112 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:40:52" (1/1) ...
[2020-08-18 19:40:52,115 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ddb36e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:52, skipping insertion in model container
[2020-08-18 19:40:52,116 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:40:52" (1/1) ...
[2020-08-18 19:40:52,124 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 19:40:52,333 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 19:40:53,943 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 19:40:53,969 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 19:40:55,519 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 19:40:55,557 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 19:40:55,557 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55 WrapperNode
[2020-08-18 19:40:55,558 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 19:40:55,558 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 19:40:55,559 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 19:40:55,559 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 19:40:55,574 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,576 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,654 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,655 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,751 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,798 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,809 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
[2020-08-18 19:40:55,823 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 19:40:55,824 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 19:40:55,824 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 19:40:55,825 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 19:40:55,826 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 19:40:55,895 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 19:40:55,895 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 19:40:55,896 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 19:40:55,896 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 19:40:55,896 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 19:40:55,896 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 19:40:55,896 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 19:40:55,897 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 19:40:55,897 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 19:40:55,897 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 19:40:55,897 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 19:40:55,898 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 19:40:55,898 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 19:40:55,898 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 19:40:55,898 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 19:40:55,898 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 19:40:55,899 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 19:40:55,899 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 19:40:55,899 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 19:40:55,899 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 19:40:55,900 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 19:40:55,900 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 19:40:55,900 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 19:40:59,849 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 19:40:59,850 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 19:40:59,867 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:40:59 BoogieIcfgContainer
[2020-08-18 19:40:59,868 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 19:40:59,871 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 19:40:59,871 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 19:40:59,875 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 19:40:59,875 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:40:52" (1/3) ...
[2020-08-18 19:40:59,876 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a13884e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:40:59, skipping insertion in model container
[2020-08-18 19:40:59,876 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:40:55" (2/3) ...
[2020-08-18 19:40:59,877 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a13884e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:40:59, skipping insertion in model container
[2020-08-18 19:40:59,877 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:40:59" (3/3) ...
[2020-08-18 19:40:59,878 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 19:40:59,889 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 19:40:59,899 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 19:40:59,914 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 19:40:59,942 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 19:40:59,942 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 19:40:59,942 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 19:40:59,942 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 19:40:59,942 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 19:40:59,943 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 19:40:59,943 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 19:40:59,943 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 19:40:59,983 INFO  L276                IsEmpty]: Start isEmpty. Operand 1449 states.
[2020-08-18 19:41:00,030 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 497
[2020-08-18 19:41:00,031 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 19:41:00,032 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 19:41:00,033 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 19:41:00,039 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 19:41:00,040 INFO  L82        PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times
[2020-08-18 19:41:00,049 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 19:41:00,050 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034638010]
[2020-08-18 19:41:00,050 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 19:41:01,058 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:02,697 WARN  L193               SmtUtils]: Spent 871.00 ms on a formula simplification that was a NOOP. DAG size: 397
[2020-08-18 19:41:02,703 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 19:41:02,725 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:03,143 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 19:41:03,144 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034638010]
[2020-08-18 19:41:03,146 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 19:41:03,146 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 19:41:03,147 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063291989]
[2020-08-18 19:41:03,153 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 19:41:03,153 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 19:41:03,167 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 19:41:03,168 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 19:41:03,170 INFO  L87              Difference]: Start difference. First operand 1449 states. Second operand 4 states.
[2020-08-18 19:41:03,927 WARN  L193               SmtUtils]: Spent 675.00 ms on a formula simplification that was a NOOP. DAG size: 398
[2020-08-18 19:41:14,414 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 19:41:14,415 INFO  L93              Difference]: Finished difference Result 2488 states and 4423 transitions.
[2020-08-18 19:41:14,415 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 19:41:14,417 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 496
[2020-08-18 19:41:14,422 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 19:41:14,458 INFO  L225             Difference]: With dead ends: 2488
[2020-08-18 19:41:14,458 INFO  L226             Difference]: Without dead ends: 2186
[2020-08-18 19:41:14,465 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 19:41:14,486 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2186 states.
[2020-08-18 19:41:14,622 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2184.
[2020-08-18 19:41:14,623 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2184 states.
[2020-08-18 19:41:14,634 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2184 states to 2184 states and 3563 transitions.
[2020-08-18 19:41:14,636 INFO  L78                 Accepts]: Start accepts. Automaton has 2184 states and 3563 transitions. Word has length 496
[2020-08-18 19:41:14,638 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 19:41:14,638 INFO  L479      AbstractCegarLoop]: Abstraction has 2184 states and 3563 transitions.
[2020-08-18 19:41:14,638 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 19:41:14,638 INFO  L276                IsEmpty]: Start isEmpty. Operand 2184 states and 3563 transitions.
[2020-08-18 19:41:14,654 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 497
[2020-08-18 19:41:14,655 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 19:41:14,655 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 19:41:14,656 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 19:41:14,656 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 19:41:14,656 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 19:41:14,657 INFO  L82        PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times
[2020-08-18 19:41:14,657 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 19:41:14,657 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139840573]
[2020-08-18 19:41:14,658 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 19:41:15,763 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:17,123 WARN  L193               SmtUtils]: Spent 854.00 ms on a formula simplification that was a NOOP. DAG size: 397
[2020-08-18 19:41:17,126 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 19:41:17,139 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:18,049 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 19:41:18,050 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139840573]
[2020-08-18 19:41:18,051 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 19:41:18,052 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 19:41:18,052 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035940022]
[2020-08-18 19:41:18,057 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 19:41:18,057 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 19:41:18,058 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 19:41:18,058 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 19:41:18,058 INFO  L87              Difference]: Start difference. First operand 2184 states and 3563 transitions. Second operand 5 states.
[2020-08-18 19:41:34,170 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 19:41:34,170 INFO  L93              Difference]: Finished difference Result 6476 states and 10564 transitions.
[2020-08-18 19:41:34,171 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 19:41:34,171 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 496
[2020-08-18 19:41:34,172 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 19:41:34,195 INFO  L225             Difference]: With dead ends: 6476
[2020-08-18 19:41:34,196 INFO  L226             Difference]: Without dead ends: 4309
[2020-08-18 19:41:34,206 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
[2020-08-18 19:41:34,213 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4309 states.
[2020-08-18 19:41:34,391 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4309 to 4307.
[2020-08-18 19:41:34,392 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4307 states.
[2020-08-18 19:41:34,409 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4307 states to 4307 states and 7000 transitions.
[2020-08-18 19:41:34,409 INFO  L78                 Accepts]: Start accepts. Automaton has 4307 states and 7000 transitions. Word has length 496
[2020-08-18 19:41:34,410 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 19:41:34,410 INFO  L479      AbstractCegarLoop]: Abstraction has 4307 states and 7000 transitions.
[2020-08-18 19:41:34,410 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 19:41:34,410 INFO  L276                IsEmpty]: Start isEmpty. Operand 4307 states and 7000 transitions.
[2020-08-18 19:41:34,434 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 499
[2020-08-18 19:41:34,435 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 19:41:34,439 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 19:41:34,439 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 19:41:34,440 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 19:41:34,441 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 19:41:34,441 INFO  L82        PathProgramCache]: Analyzing trace with hash 589891249, now seen corresponding path program 1 times
[2020-08-18 19:41:34,442 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 19:41:34,442 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033045676]
[2020-08-18 19:41:34,443 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 19:41:34,798 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:35,924 WARN  L193               SmtUtils]: Spent 840.00 ms on a formula simplification that was a NOOP. DAG size: 397
[2020-08-18 19:41:35,926 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 19:41:35,934 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 19:41:36,507 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 19:41:36,509 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033045676]
[2020-08-18 19:41:36,511 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 19:41:36,512 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 19:41:36,513 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888601344]
[2020-08-18 19:41:36,515 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 19:41:36,515 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 19:41:36,518 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 19:41:36,518 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 19:41:36,518 INFO  L87              Difference]: Start difference. First operand 4307 states and 7000 transitions. Second operand 4 states.