/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-19 01:19:33,123 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-19 01:19:33,126 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-19 01:19:33,167 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-19 01:19:33,168 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-19 01:19:33,175 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-19 01:19:33,177 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-19 01:19:33,179 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-19 01:19:33,186 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-19 01:19:33,187 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-19 01:19:33,188 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-19 01:19:33,189 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-19 01:19:33,189 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-19 01:19:33,190 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-19 01:19:33,193 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-19 01:19:33,195 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-19 01:19:33,197 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-19 01:19:33,198 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-19 01:19:33,200 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-19 01:19:33,205 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-19 01:19:33,210 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-19 01:19:33,211 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-19 01:19:33,213 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-19 01:19:33,214 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-19 01:19:33,219 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-19 01:19:33,219 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-19 01:19:33,220 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-19 01:19:33,224 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-19 01:19:33,226 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-19 01:19:33,228 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-19 01:19:33,228 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-19 01:19:33,229 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-19 01:19:33,230 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-19 01:19:33,231 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-19 01:19:33,232 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-19 01:19:33,232 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-19 01:19:33,233 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-19 01:19:33,233 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-19 01:19:33,233 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-19 01:19:33,235 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-19 01:19:33,236 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
[2020-08-19 01:19:33,283 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-19 01:19:33,283 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-19 01:19:33,286 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-19 01:19:33,286 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-19 01:19:33,286 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-19 01:19:33,286 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-19 01:19:33,287 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-19 01:19:33,287 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-19 01:19:33,287 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-19 01:19:33,287 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-19 01:19:33,288 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-19 01:19:33,289 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-19 01:19:33,289 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-19 01:19:33,289 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-19 01:19:33,290 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-19 01:19:33,290 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-19 01:19:33,290 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-19 01:19:33,290 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-19 01:19:33,290 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-19 01:19:33,291 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-19 01:19:33,291 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-19 01:19:33,291 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-19 01:19:33,291 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-19 01:19:33,291 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-19 01:19:33,292 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-19 01:19:33,292 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-19 01:19:33,292 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-19 01:19:33,292 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-19 01:19:33,292 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-19 01:19:33,292 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=WIDESTAMONGSMALL;tolerance=0.6;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;
[2020-08-19 01:19:33,652 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-19 01:19:33,683 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-19 01:19:33,689 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-19 01:19:33,691 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-19 01:19:33,691 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-19 01:19:33,692 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-19 01:19:33,767 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1738c4ef2/558ee8b620ab4de592455bf877fe6174/FLAG9db4ebb71
[2020-08-19 01:19:34,462 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-19 01:19:34,463 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-19 01:19:34,480 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1738c4ef2/558ee8b620ab4de592455bf877fe6174/FLAG9db4ebb71
[2020-08-19 01:19:34,592 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1738c4ef2/558ee8b620ab4de592455bf877fe6174
[2020-08-19 01:19:34,601 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-19 01:19:34,603 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-19 01:19:34,605 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-19 01:19:34,605 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-19 01:19:34,609 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-19 01:19:34,610 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:19:34" (1/1) ...
[2020-08-19 01:19:34,614 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3310a15d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:34, skipping insertion in model container
[2020-08-19 01:19:34,614 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:19:34" (1/1) ...
[2020-08-19 01:19:34,623 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-19 01:19:34,753 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-19 01:19:35,846 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-19 01:19:35,860 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-19 01:19:36,628 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-19 01:19:36,667 INFO  L208         MainTranslator]: Completed translation
[2020-08-19 01:19:36,670 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36 WrapperNode
[2020-08-19 01:19:36,670 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-19 01:19:36,671 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-19 01:19:36,672 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-19 01:19:36,672 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-19 01:19:36,693 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,695 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,737 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,737 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,785 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,827 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,835 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
[2020-08-19 01:19:36,850 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-19 01:19:36,851 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-19 01:19:36,851 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-19 01:19:36,851 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-19 01:19:36,854 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-19 01:19:36,934 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-19 01:19:36,934 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-19 01:19:36,935 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-19 01:19:36,935 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-19 01:19:36,936 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-19 01:19:36,936 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-19 01:19:36,936 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-19 01:19:36,936 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-19 01:19:36,936 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-19 01:19:36,937 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-19 01:19:36,937 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-19 01:19:36,938 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-19 01:19:36,938 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-19 01:19:36,938 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-19 01:19:36,938 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-19 01:19:36,939 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-19 01:19:36,939 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-19 01:19:36,940 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-19 01:19:36,940 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-19 01:19:36,940 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-19 01:19:36,941 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-19 01:19:36,941 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-19 01:19:39,664 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-19 01:19:39,665 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-19 01:19:39,675 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:19:39 BoogieIcfgContainer
[2020-08-19 01:19:39,675 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-19 01:19:39,677 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-19 01:19:39,677 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-19 01:19:39,681 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-19 01:19:39,681 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:19:34" (1/3) ...
[2020-08-19 01:19:39,682 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bca5e71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:19:39, skipping insertion in model container
[2020-08-19 01:19:39,682 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:19:36" (2/3) ...
[2020-08-19 01:19:39,683 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bca5e71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:19:39, skipping insertion in model container
[2020-08-19 01:19:39,683 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:19:39" (3/3) ...
[2020-08-19 01:19:39,685 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-19 01:19:39,697 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-19 01:19:39,718 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-19 01:19:39,734 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-19 01:19:39,774 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-19 01:19:39,775 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-19 01:19:39,775 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-19 01:19:39,775 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-19 01:19:39,775 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-19 01:19:39,775 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-19 01:19:39,775 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-19 01:19:39,776 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-19 01:19:39,818 INFO  L276                IsEmpty]: Start isEmpty. Operand 789 states.
[2020-08-19 01:19:39,864 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-19 01:19:39,864 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:19:39,866 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:19:39,866 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:19:39,873 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:19:39,874 INFO  L82        PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times
[2020-08-19 01:19:39,884 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:19:39,884 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159709773]
[2020-08-19 01:19:39,885 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:19:40,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:41,531 WARN  L193               SmtUtils]: Spent 513.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:19:41,534 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:19:41,542 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:41,749 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:19:41,750 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159709773]
[2020-08-19 01:19:41,752 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:19:41,753 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:19:41,754 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091901124]
[2020-08-19 01:19:41,760 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:19:41,761 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:19:41,777 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:19:41,778 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:19:41,780 INFO  L87              Difference]: Start difference. First operand 789 states. Second operand 4 states.
[2020-08-19 01:19:42,268 WARN  L193               SmtUtils]: Spent 411.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-19 01:19:47,198 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:19:47,199 INFO  L93              Difference]: Finished difference Result 1489 states and 2621 transitions.
[2020-08-19 01:19:47,199 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-19 01:19:47,201 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-19 01:19:47,203 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:19:47,231 INFO  L225             Difference]: With dead ends: 1489
[2020-08-19 01:19:47,231 INFO  L226             Difference]: Without dead ends: 1273
[2020-08-19 01:19:47,237 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
[2020-08-19 01:19:47,259 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1273 states.
[2020-08-19 01:19:47,376 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271.
[2020-08-19 01:19:47,377 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1271 states.
[2020-08-19 01:19:47,384 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions.
[2020-08-19 01:19:47,386 INFO  L78                 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326
[2020-08-19 01:19:47,392 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:19:47,392 INFO  L479      AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions.
[2020-08-19 01:19:47,392 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 01:19:47,392 INFO  L276                IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions.
[2020-08-19 01:19:47,404 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-19 01:19:47,404 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:19:47,405 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:19:47,405 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-19 01:19:47,405 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:19:47,405 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:19:47,406 INFO  L82        PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times
[2020-08-19 01:19:47,406 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:19:47,406 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432596632]
[2020-08-19 01:19:47,407 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:19:47,660 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:48,466 WARN  L193               SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:19:48,468 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:19:48,491 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:48,725 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:19:48,726 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432596632]
[2020-08-19 01:19:48,726 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:19:48,727 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:19:48,727 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910068897]
[2020-08-19 01:19:48,730 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:19:48,731 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:19:48,731 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:19:48,731 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:19:48,732 INFO  L87              Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states.
[2020-08-19 01:19:49,208 WARN  L193               SmtUtils]: Spent 437.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-19 01:19:53,352 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:19:53,353 INFO  L93              Difference]: Finished difference Result 2607 states and 4089 transitions.
[2020-08-19 01:19:53,356 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-19 01:19:53,356 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-19 01:19:53,357 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:19:53,372 INFO  L225             Difference]: With dead ends: 2607
[2020-08-19 01:19:53,373 INFO  L226             Difference]: Without dead ends: 2225
[2020-08-19 01:19:53,379 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
[2020-08-19 01:19:53,384 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2225 states.
[2020-08-19 01:19:53,454 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223.
[2020-08-19 01:19:53,454 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2223 states.
[2020-08-19 01:19:53,464 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions.
[2020-08-19 01:19:53,465 INFO  L78                 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326
[2020-08-19 01:19:53,466 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:19:53,466 INFO  L479      AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions.
[2020-08-19 01:19:53,466 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 01:19:53,466 INFO  L276                IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions.
[2020-08-19 01:19:53,475 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-19 01:19:53,475 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:19:53,476 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]
[2020-08-19 01:19:53,476 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-19 01:19:53,476 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:19:53,477 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:19:53,477 INFO  L82        PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times
[2020-08-19 01:19:53,477 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:19:53,478 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916608088]
[2020-08-19 01:19:53,478 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:19:53,745 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:54,438 WARN  L193               SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:19:54,440 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:19:54,449 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:19:54,707 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:19:54,708 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916608088]
[2020-08-19 01:19:54,708 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:19:54,709 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:19:54,709 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403915837]
[2020-08-19 01:19:54,711 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:19:54,711 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:19:54,712 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:19:54,713 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:19:54,714 INFO  L87              Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states.
[2020-08-19 01:19:55,383 WARN  L193               SmtUtils]: Spent 613.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-19 01:19:59,260 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:19:59,260 INFO  L93              Difference]: Finished difference Result 4715 states and 7386 transitions.
[2020-08-19 01:19:59,261 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-19 01:19:59,261 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-19 01:19:59,262 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:19:59,282 INFO  L225             Difference]: With dead ends: 4715
[2020-08-19 01:19:59,283 INFO  L226             Difference]: Without dead ends: 4049
[2020-08-19 01:19:59,285 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-19 01:19:59,291 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4049 states.
[2020-08-19 01:19:59,397 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047.
[2020-08-19 01:19:59,397 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4047 states.
[2020-08-19 01:19:59,410 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions.
[2020-08-19 01:19:59,410 INFO  L78                 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326
[2020-08-19 01:19:59,411 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:19:59,411 INFO  L479      AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions.
[2020-08-19 01:19:59,411 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 01:19:59,412 INFO  L276                IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions.
[2020-08-19 01:19:59,421 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-19 01:19:59,422 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:19:59,422 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:19:59,423 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-19 01:19:59,423 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:19:59,423 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:19:59,423 INFO  L82        PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times
[2020-08-19 01:19:59,424 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:19:59,424 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827450657]
[2020-08-19 01:19:59,425 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:19:59,813 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:00,542 WARN  L193               SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:20:00,543 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:20:00,549 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:00,758 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:20:00,758 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827450657]
[2020-08-19 01:20:00,759 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:20:00,759 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-19 01:20:00,759 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553197268]
[2020-08-19 01:20:00,760 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-19 01:20:00,760 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:20:00,761 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-19 01:20:00,761 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-19 01:20:00,761 INFO  L87              Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states.
[2020-08-19 01:20:07,787 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:20:07,788 INFO  L93              Difference]: Finished difference Result 11998 states and 18565 transitions.
[2020-08-19 01:20:07,788 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-19 01:20:07,788 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 326
[2020-08-19 01:20:07,789 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:20:07,826 INFO  L225             Difference]: With dead ends: 11998
[2020-08-19 01:20:07,826 INFO  L226             Difference]: Without dead ends: 7966
[2020-08-19 01:20:07,837 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
[2020-08-19 01:20:07,848 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7966 states.
[2020-08-19 01:20:08,156 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964.
[2020-08-19 01:20:08,156 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7964 states.
[2020-08-19 01:20:08,180 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions.
[2020-08-19 01:20:08,181 INFO  L78                 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326
[2020-08-19 01:20:08,181 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:20:08,181 INFO  L479      AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions.
[2020-08-19 01:20:08,181 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-19 01:20:08,181 INFO  L276                IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions.
[2020-08-19 01:20:08,200 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-19 01:20:08,200 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:20:08,200 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:20:08,201 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-19 01:20:08,201 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:20:08,201 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:20:08,202 INFO  L82        PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times
[2020-08-19 01:20:08,202 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:20:08,202 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245253108]
[2020-08-19 01:20:08,203 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:20:08,341 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:08,933 WARN  L193               SmtUtils]: Spent 350.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:20:08,934 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:20:08,939 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:09,102 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:20:09,103 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245253108]
[2020-08-19 01:20:09,103 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:20:09,103 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:20:09,103 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595662932]
[2020-08-19 01:20:09,104 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:20:09,104 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:20:09,105 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:20:09,105 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:20:09,105 INFO  L87              Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states.
[2020-08-19 01:20:17,260 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:20:17,260 INFO  L93              Difference]: Finished difference Result 23441 states and 36046 transitions.
[2020-08-19 01:20:17,261 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-19 01:20:17,261 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-19 01:20:17,261 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:20:17,316 INFO  L225             Difference]: With dead ends: 23441
[2020-08-19 01:20:17,316 INFO  L226             Difference]: Without dead ends: 15606
[2020-08-19 01:20:17,332 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
[2020-08-19 01:20:17,348 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15606 states.
[2020-08-19 01:20:17,923 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604.
[2020-08-19 01:20:17,923 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15604 states.
[2020-08-19 01:20:17,956 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions.
[2020-08-19 01:20:17,957 INFO  L78                 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328
[2020-08-19 01:20:17,957 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:20:17,957 INFO  L479      AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions.
[2020-08-19 01:20:17,957 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 01:20:17,957 INFO  L276                IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions.
[2020-08-19 01:20:17,992 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-19 01:20:17,992 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:20:17,992 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:20:17,993 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-19 01:20:17,993 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:20:17,996 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:20:17,997 INFO  L82        PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times
[2020-08-19 01:20:17,998 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:20:17,998 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463795123]
[2020-08-19 01:20:17,998 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:20:18,041 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:18,478 WARN  L193               SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:20:18,480 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:20:18,485 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:18,574 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:20:18,575 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463795123]
[2020-08-19 01:20:18,575 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:20:18,575 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:20:18,575 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939670214]
[2020-08-19 01:20:18,576 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:20:18,576 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:20:18,577 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:20:18,577 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:20:18,577 INFO  L87              Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states.
[2020-08-19 01:20:26,792 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 01:20:26,793 INFO  L93              Difference]: Finished difference Result 46737 states and 71555 transitions.
[2020-08-19 01:20:26,794 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-19 01:20:26,794 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-19 01:20:26,794 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 01:20:26,874 INFO  L225             Difference]: With dead ends: 46737
[2020-08-19 01:20:26,874 INFO  L226             Difference]: Without dead ends: 31175
[2020-08-19 01:20:26,914 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:20:26,952 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31175 states.
[2020-08-19 01:20:28,379 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623.
[2020-08-19 01:20:28,379 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15623 states.
[2020-08-19 01:20:28,407 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions.
[2020-08-19 01:20:28,407 INFO  L78                 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328
[2020-08-19 01:20:28,407 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 01:20:28,408 INFO  L479      AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions.
[2020-08-19 01:20:28,408 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 01:20:28,408 INFO  L276                IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions.
[2020-08-19 01:20:28,437 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 330
[2020-08-19 01:20:28,437 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 01:20:28,437 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 01:20:28,438 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-19 01:20:28,438 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 01:20:28,438 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 01:20:28,438 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times
[2020-08-19 01:20:28,439 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 01:20:28,439 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944563579]
[2020-08-19 01:20:28,439 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 01:20:28,479 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:28,921 WARN  L193               SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-19 01:20:28,922 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 01:20:28,928 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 01:20:29,010 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 01:20:29,010 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944563579]
[2020-08-19 01:20:29,011 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 01:20:29,011 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 01:20:29,011 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325801262]
[2020-08-19 01:20:29,012 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 01:20:29,012 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 01:20:29,012 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 01:20:29,012 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 01:20:29,012 INFO  L87              Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.