/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --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_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 21:32:02,723 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 21:32:02,727 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 21:32:02,755 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 21:32:02,755 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 21:32:02,756 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 21:32:02,757 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 21:32:02,759 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 21:32:02,761 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 21:32:02,762 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 21:32:02,763 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 21:32:02,764 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 21:32:02,764 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 21:32:02,765 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 21:32:02,766 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 21:32:02,767 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 21:32:02,768 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 21:32:02,769 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 21:32:02,771 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 21:32:02,772 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 21:32:02,774 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 21:32:02,775 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 21:32:02,776 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 21:32:02,777 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 21:32:02,779 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 21:32:02,780 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 21:32:02,780 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 21:32:02,781 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 21:32:02,781 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 21:32:02,782 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 21:32:02,782 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 21:32:02,783 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 21:32:02,784 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 21:32:02,785 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 21:32:02,785 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 21:32:02,786 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 21:32:02,786 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 21:32:02,787 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 21:32:02,787 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 21:32:02,788 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 21:32:02,788 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 21:32:02,789 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 21:32:02,811 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 21:32:02,811 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 21:32:02,813 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 21:32:02,813 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 21:32:02,813 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 21:32:02,813 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 21:32:02,814 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 21:32:02,815 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 21:32:02,815 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 21:32:02,815 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 21:32:02,815 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 21:32:02,815 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 21:32:02,816 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 21:32:02,816 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 21:32:02,816 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 21:32:02,816 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 21:32:02,816 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 21:32:02,817 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 21:32:02,817 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 21:32:02,817 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 21:32:02,817 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 21:32:02,817 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 21:32:02,817 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 21:32:02,818 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 21:32:02,818 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=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;
[2020-08-21 21:32:03,121 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 21:32:03,141 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 21:32:03,146 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 21:32:03,148 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 21:32:03,150 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 21:32:03,151 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:03,217 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/682ae936c/6828da673ace4dd485c8ef06bc64da4d/FLAG61ddb6099
[2020-08-21 21:32:03,958 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 21:32:03,959 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:03,986 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/682ae936c/6828da673ace4dd485c8ef06bc64da4d/FLAG61ddb6099
[2020-08-21 21:32:04,076 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/682ae936c/6828da673ace4dd485c8ef06bc64da4d
[2020-08-21 21:32:04,087 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 21:32:04,089 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 21:32:04,090 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 21:32:04,090 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 21:32:04,094 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 21:32:04,095 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:32:04" (1/1) ...
[2020-08-21 21:32:04,098 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dc8c9c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:04, skipping insertion in model container
[2020-08-21 21:32:04,098 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:32:04" (1/1) ...
[2020-08-21 21:32:04,106 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 21:32:04,271 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 21:32:05,699 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 21:32:05,712 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 21:32:07,182 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 21:32:07,215 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 21:32:07,215 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07 WrapperNode
[2020-08-21 21:32:07,215 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 21:32:07,216 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 21:32:07,216 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 21:32:07,216 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 21:32:07,232 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,233 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,287 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,288 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,384 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,432 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,444 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (1/1) ...
[2020-08-21 21:32:07,459 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 21:32:07,459 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 21:32:07,460 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 21:32:07,460 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 21:32:07,461 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (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 21:32:07,534 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 21:32:07,535 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 21:32:07,535 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 21:32:07,535 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 21:32:07,536 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 21:32:07,536 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 21:32:07,537 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 21:32:07,537 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 21:32:07,537 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 21:32:07,538 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 21:32:07,538 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 21:32:07,538 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 21:32:07,539 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 21:32:07,539 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 21:32:07,539 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 21:32:07,540 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 21:32:07,540 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-21 21:32:07,541 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 21:32:07,541 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 21:32:07,541 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 21:32:07,542 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 21:32:07,542 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 21:32:11,447 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 21:32:11,447 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 21:32:11,460 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:32:11 BoogieIcfgContainer
[2020-08-21 21:32:11,460 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 21:32:11,462 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 21:32:11,463 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 21:32:11,466 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 21:32:11,467 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:32:04" (1/3) ...
[2020-08-21 21:32:11,468 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a55bf10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:32:11, skipping insertion in model container
[2020-08-21 21:32:11,468 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:07" (2/3) ...
[2020-08-21 21:32:11,469 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a55bf10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:32:11, skipping insertion in model container
[2020-08-21 21:32:11,469 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:32:11" (3/3) ...
[2020-08-21 21:32:11,471 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:11,488 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 21:32:11,499 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 21:32:11,521 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 21:32:11,558 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 21:32:11,558 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 21:32:11,559 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 21:32:11,559 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 21:32:11,559 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 21:32:11,559 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 21:32:11,559 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 21:32:11,560 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 21:32:11,611 INFO  L276                IsEmpty]: Start isEmpty. Operand 1322 states.
[2020-08-21 21:32:11,651 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-21 21:32:11,651 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:11,653 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]
[2020-08-21 21:32:11,654 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:11,663 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:11,664 INFO  L82        PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times
[2020-08-21 21:32:11,678 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:11,679 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815742914]
[2020-08-21 21:32:11,680 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:12,885 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:14,322 WARN  L193               SmtUtils]: Spent 845.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 21:32:14,324 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:14,333 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:14,573 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 21:32:14,574 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815742914]
[2020-08-21 21:32:14,576 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:14,576 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:32:14,576 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184048707]
[2020-08-21 21:32:14,582 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:32:14,582 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:14,594 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:32:14,595 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:32:14,598 INFO  L87              Difference]: Start difference. First operand 1322 states. Second operand 4 states.
[2020-08-21 21:32:15,561 WARN  L193               SmtUtils]: Spent 871.00 ms on a formula simplification that was a NOOP. DAG size: 389
[2020-08-21 21:32:25,237 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:32:25,238 INFO  L93              Difference]: Finished difference Result 2212 states and 3947 transitions.
[2020-08-21 21:32:25,239 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:32:25,241 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 467
[2020-08-21 21:32:25,244 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:32:25,279 INFO  L225             Difference]: With dead ends: 2212
[2020-08-21 21:32:25,280 INFO  L226             Difference]: Without dead ends: 1956
[2020-08-21 21:32:25,287 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:32:25,312 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1956 states.
[2020-08-21 21:32:25,438 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954.
[2020-08-21 21:32:25,440 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1954 states.
[2020-08-21 21:32:25,451 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions.
[2020-08-21 21:32:25,453 INFO  L78                 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467
[2020-08-21 21:32:25,458 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:32:25,459 INFO  L479      AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions.
[2020-08-21 21:32:25,459 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:32:25,459 INFO  L276                IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions.
[2020-08-21 21:32:25,474 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-21 21:32:25,475 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:25,476 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]
[2020-08-21 21:32:25,476 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 21:32:25,477 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:25,477 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:25,477 INFO  L82        PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times
[2020-08-21 21:32:25,478 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:25,478 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386053318]
[2020-08-21 21:32:25,479 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:27,070 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:28,463 WARN  L193               SmtUtils]: Spent 998.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 21:32:28,466 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:28,477 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:29,266 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 21:32:29,267 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386053318]
[2020-08-21 21:32:29,268 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:29,268 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 21:32:29,268 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657765518]
[2020-08-21 21:32:29,271 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 21:32:29,272 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:29,272 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 21:32:29,272 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:32:29,273 INFO  L87              Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states.
[2020-08-21 21:32:44,101 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:32:44,102 INFO  L93              Difference]: Finished difference Result 5793 states and 9438 transitions.
[2020-08-21 21:32:44,104 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:32:44,104 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 467
[2020-08-21 21:32:44,105 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:32:44,129 INFO  L225             Difference]: With dead ends: 5793
[2020-08-21 21:32:44,129 INFO  L226             Difference]: Without dead ends: 3856
[2020-08-21 21:32:44,136 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 21:32:44,142 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3856 states.
[2020-08-21 21:32:44,283 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854.
[2020-08-21 21:32:44,284 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3854 states.
[2020-08-21 21:32:44,300 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions.
[2020-08-21 21:32:44,301 INFO  L78                 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467
[2020-08-21 21:32:44,302 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:32:44,302 INFO  L479      AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions.
[2020-08-21 21:32:44,302 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 21:32:44,302 INFO  L276                IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions.
[2020-08-21 21:32:44,323 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 470
[2020-08-21 21:32:44,324 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:44,329 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]
[2020-08-21 21:32:44,330 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 21:32:44,331 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:44,331 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:44,331 INFO  L82        PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times
[2020-08-21 21:32:44,332 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:44,333 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707389248]
[2020-08-21 21:32:44,333 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:44,698 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:45,696 WARN  L193               SmtUtils]: Spent 805.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-21 21:32:45,698 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:45,706 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:46,005 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 21:32:46,006 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707389248]
[2020-08-21 21:32:46,006 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:46,006 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:32:46,007 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020881768]
[2020-08-21 21:32:46,008 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:32:46,008 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:46,008 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:32:46,008 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:32:46,009 INFO  L87              Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states.