/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_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 21:32:35,995 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 21:32:35,998 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 21:32:36,041 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 21:32:36,041 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 21:32:36,050 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 21:32:36,051 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 21:32:36,054 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 21:32:36,057 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 21:32:36,058 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 21:32:36,060 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 21:32:36,061 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 21:32:36,061 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 21:32:36,063 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 21:32:36,066 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 21:32:36,067 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 21:32:36,068 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 21:32:36,069 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 21:32:36,073 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 21:32:36,077 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 21:32:36,082 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 21:32:36,083 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 21:32:36,085 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 21:32:36,085 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 21:32:36,090 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 21:32:36,091 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 21:32:36,091 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 21:32:36,094 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 21:32:36,094 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 21:32:36,102 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 21:32:36,102 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 21:32:36,103 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 21:32:36,104 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 21:32:36,108 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 21:32:36,109 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 21:32:36,109 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 21:32:36,110 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 21:32:36,110 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 21:32:36,110 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-21 21:32:36,112 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 21:32:36,113 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 21:32:36,152 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 21:32:36,153 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 21:32:36,155 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 21:32:36,155 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 21:32:36,155 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 21:32:36,155 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 21:32:36,156 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 21:32:36,156 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 21:32:36,156 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 21:32:36,156 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 21:32:36,157 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 21:32:36,157 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 21:32:36,158 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 21:32:36,158 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 21:32:36,158 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 21:32:36,158 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 21:32:36,159 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 21:32:36,159 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 21:32:36,159 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 21:32:36,159 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 21:32:36,159 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 21:32:36,160 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 21:32:36,160 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 21:32:36,160 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 21:32:36,160 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 21:32:36,160 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 21:32:36,161 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 21:32:36,161 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 21:32:36,161 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 21:32:36,161 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 21:32:36,458 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 21:32:36,471 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 21:32:36,474 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 21:32:36,476 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 21:32:36,478 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 21:32:36,479 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:36,555 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bba46d94b/c50f5fd89fe14c18896c6ac38f195deb/FLAG1f9cf7534
[2020-08-21 21:32:37,272 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 21:32:37,273 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:37,297 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bba46d94b/c50f5fd89fe14c18896c6ac38f195deb/FLAG1f9cf7534
[2020-08-21 21:32:37,373 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bba46d94b/c50f5fd89fe14c18896c6ac38f195deb
[2020-08-21 21:32:37,384 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 21:32:37,385 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 21:32:37,388 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 21:32:37,388 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 21:32:37,392 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 21:32:37,393 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:32:37" (1/1) ...
[2020-08-21 21:32:37,397 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@701ef800 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:37, skipping insertion in model container
[2020-08-21 21:32:37,397 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:32:37" (1/1) ...
[2020-08-21 21:32:37,407 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 21:32:37,532 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 21:32:38,623 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 21:32:38,641 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 21:32:39,082 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 21:32:39,111 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 21:32:39,112 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39 WrapperNode
[2020-08-21 21:32:39,112 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 21:32:39,113 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 21:32:39,113 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 21:32:39,113 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 21:32:39,135 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,135 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,160 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,160 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,261 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,306 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,315 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (1/1) ...
[2020-08-21 21:32:39,327 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 21:32:39,328 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 21:32:39,328 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 21:32:39,328 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 21:32:39,329 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (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 21:32:39,424 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 21:32:39,424 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 21:32:39,425 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 21:32:39,425 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 21:32:39,425 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 21:32:39,426 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 21:32:39,426 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 21:32:39,426 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 21:32:39,426 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 21:32:39,427 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 21:32:39,427 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 21:32:39,427 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 21:32:39,427 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 21:32:39,427 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 21:32:39,428 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 21:32:39,428 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 21:32:39,428 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 21:32:39,428 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 21:32:39,429 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 21:32:39,429 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 21:32:39,429 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 21:32:39,430 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 21:32:42,067 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 21:32:42,067 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 21:32:42,077 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:32:42 BoogieIcfgContainer
[2020-08-21 21:32:42,077 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 21:32:42,079 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 21:32:42,079 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 21:32:42,082 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 21:32:42,082 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:32:37" (1/3) ...
[2020-08-21 21:32:42,083 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b0e71bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:32:42, skipping insertion in model container
[2020-08-21 21:32:42,083 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:32:39" (2/3) ...
[2020-08-21 21:32:42,084 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b0e71bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:32:42, skipping insertion in model container
[2020-08-21 21:32:42,084 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:32:42" (3/3) ...
[2020-08-21 21:32:42,086 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 21:32:42,096 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 21:32:42,105 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 21:32:42,119 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 21:32:42,146 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 21:32:42,147 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 21:32:42,147 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 21:32:42,147 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 21:32:42,147 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 21:32:42,147 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 21:32:42,147 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 21:32:42,148 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 21:32:42,179 INFO  L276                IsEmpty]: Start isEmpty. Operand 796 states.
[2020-08-21 21:32:42,209 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 21:32:42,209 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:42,211 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]
[2020-08-21 21:32:42,211 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:42,216 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:42,217 INFO  L82        PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times
[2020-08-21 21:32:42,225 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:42,225 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670674247]
[2020-08-21 21:32:42,225 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:42,872 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:43,773 WARN  L193               SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:32:43,782 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:43,795 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:43,969 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 21:32:43,970 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670674247]
[2020-08-21 21:32:43,972 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:43,972 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:32:43,973 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243697377]
[2020-08-21 21:32:43,979 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:32:43,979 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:43,993 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:32:43,994 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:32:43,996 INFO  L87              Difference]: Start difference. First operand 796 states. Second operand 4 states.
[2020-08-21 21:32:44,472 WARN  L193               SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 21:32:49,355 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:32:49,356 INFO  L93              Difference]: Finished difference Result 1515 states and 2659 transitions.
[2020-08-21 21:32:49,356 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:32:49,358 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 21:32:49,360 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:32:49,386 INFO  L225             Difference]: With dead ends: 1515
[2020-08-21 21:32:49,386 INFO  L226             Difference]: Without dead ends: 1299
[2020-08-21 21:32:49,392 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:32:49,415 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1299 states.
[2020-08-21 21:32:49,540 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297.
[2020-08-21 21:32:49,541 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1297 states.
[2020-08-21 21:32:49,548 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions.
[2020-08-21 21:32:49,550 INFO  L78                 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318
[2020-08-21 21:32:49,556 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:32:49,556 INFO  L479      AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions.
[2020-08-21 21:32:49,556 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:32:49,556 INFO  L276                IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions.
[2020-08-21 21:32:49,570 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 21:32:49,570 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:49,571 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]
[2020-08-21 21:32:49,571 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 21:32:49,571 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:49,571 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:49,572 INFO  L82        PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times
[2020-08-21 21:32:49,572 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:49,572 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195729569]
[2020-08-21 21:32:49,573 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:49,848 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:50,658 WARN  L193               SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:32:50,660 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:50,670 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:50,937 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 21:32:50,938 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195729569]
[2020-08-21 21:32:50,938 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:50,939 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:32:50,939 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980660647]
[2020-08-21 21:32:50,944 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:32:50,944 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:50,945 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:32:50,945 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:32:50,945 INFO  L87              Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states.
[2020-08-21 21:32:51,558 WARN  L193               SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 21:32:55,784 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:32:55,784 INFO  L93              Difference]: Finished difference Result 2671 states and 4201 transitions.
[2020-08-21 21:32:55,785 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:32:55,785 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 21:32:55,786 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:32:55,800 INFO  L225             Difference]: With dead ends: 2671
[2020-08-21 21:32:55,801 INFO  L226             Difference]: Without dead ends: 2289
[2020-08-21 21:32:55,809 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
[2020-08-21 21:32:55,813 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2289 states.
[2020-08-21 21:32:55,889 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287.
[2020-08-21 21:32:55,890 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2287 states.
[2020-08-21 21:32:55,903 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions.
[2020-08-21 21:32:55,903 INFO  L78                 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318
[2020-08-21 21:32:55,904 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:32:55,904 INFO  L479      AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions.
[2020-08-21 21:32:55,904 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:32:55,904 INFO  L276                IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions.
[2020-08-21 21:32:55,914 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 21:32:55,917 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:32:55,918 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]
[2020-08-21 21:32:55,918 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 21:32:55,918 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:32:55,918 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:32:55,919 INFO  L82        PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times
[2020-08-21 21:32:55,919 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:32:55,920 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456314861]
[2020-08-21 21:32:55,920 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:32:56,159 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:56,706 WARN  L193               SmtUtils]: Spent 376.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:32:56,707 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:32:56,714 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:32:56,865 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 21:32:56,865 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456314861]
[2020-08-21 21:32:56,866 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:32:56,866 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:32:56,866 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734880103]
[2020-08-21 21:32:56,867 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:32:56,867 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:32:56,867 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:32:56,868 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:32:56,868 INFO  L87              Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states.
[2020-08-21 21:32:57,264 WARN  L193               SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 21:33:01,722 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:33:01,722 INFO  L93              Difference]: Finished difference Result 4943 states and 7762 transitions.
[2020-08-21 21:33:01,723 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:33:01,724 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 21:33:01,725 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:33:01,748 INFO  L225             Difference]: With dead ends: 4943
[2020-08-21 21:33:01,748 INFO  L226             Difference]: Without dead ends: 4229
[2020-08-21 21:33:01,753 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:33:01,759 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4229 states.
[2020-08-21 21:33:01,884 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227.
[2020-08-21 21:33:01,885 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4227 states.
[2020-08-21 21:33:01,900 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions.
[2020-08-21 21:33:01,901 INFO  L78                 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318
[2020-08-21 21:33:01,901 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:33:01,901 INFO  L479      AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions.
[2020-08-21 21:33:01,902 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:33:01,902 INFO  L276                IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions.
[2020-08-21 21:33:01,915 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 21:33:01,915 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:33:01,915 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]
[2020-08-21 21:33:01,916 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 21:33:01,916 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:33:01,916 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:33:01,917 INFO  L82        PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times
[2020-08-21 21:33:01,917 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:33:01,918 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82242654]
[2020-08-21 21:33:01,918 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:33:02,166 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:02,743 WARN  L193               SmtUtils]: Spent 399.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:33:02,744 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:33:02,757 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:02,882 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 21:33:02,882 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82242654]
[2020-08-21 21:33:02,883 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:33:02,883 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:33:02,883 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936783550]
[2020-08-21 21:33:02,884 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:33:02,884 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:33:02,885 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:33:02,885 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:33:02,885 INFO  L87              Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states.
[2020-08-21 21:33:03,379 WARN  L193               SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 21:33:07,506 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:33:07,507 INFO  L93              Difference]: Finished difference Result 9359 states and 14670 transitions.
[2020-08-21 21:33:07,507 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:33:07,507 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 318
[2020-08-21 21:33:07,508 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:33:07,546 INFO  L225             Difference]: With dead ends: 9359
[2020-08-21 21:33:07,547 INFO  L226             Difference]: Without dead ends: 8029
[2020-08-21 21:33:07,552 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:33:07,561 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8029 states.
[2020-08-21 21:33:07,813 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027.
[2020-08-21 21:33:07,814 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8027 states.
[2020-08-21 21:33:07,846 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions.
[2020-08-21 21:33:07,846 INFO  L78                 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318
[2020-08-21 21:33:07,847 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:33:07,847 INFO  L479      AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions.
[2020-08-21 21:33:07,847 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:33:07,847 INFO  L276                IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions.
[2020-08-21 21:33:07,866 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 319
[2020-08-21 21:33:07,867 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:33:07,867 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]
[2020-08-21 21:33:07,867 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 21:33:07,868 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:33:07,868 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:33:07,869 INFO  L82        PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times
[2020-08-21 21:33:07,869 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:33:07,869 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411811393]
[2020-08-21 21:33:07,869 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:33:08,277 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:08,862 WARN  L193               SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:33:08,863 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:33:08,868 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:09,072 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 21:33:09,073 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411811393]
[2020-08-21 21:33:09,073 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:33:09,073 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 21:33:09,074 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780277488]
[2020-08-21 21:33:09,074 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 21:33:09,074 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:33:09,075 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 21:33:09,075 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 21:33:09,075 INFO  L87              Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states.
[2020-08-21 21:33:16,036 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:33:16,036 INFO  L93              Difference]: Finished difference Result 23754 states and 36777 transitions.
[2020-08-21 21:33:16,037 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 21:33:16,037 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 318
[2020-08-21 21:33:16,037 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:33:16,099 INFO  L225             Difference]: With dead ends: 23754
[2020-08-21 21:33:16,099 INFO  L226             Difference]: Without dead ends: 15742
[2020-08-21 21:33:16,117 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 21:33:16,135 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15742 states.
[2020-08-21 21:33:16,733 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740.
[2020-08-21 21:33:16,734 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15740 states.
[2020-08-21 21:33:16,767 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions.
[2020-08-21 21:33:16,768 INFO  L78                 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318
[2020-08-21 21:33:16,768 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:33:16,768 INFO  L479      AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions.
[2020-08-21 21:33:16,769 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 21:33:16,769 INFO  L276                IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions.
[2020-08-21 21:33:16,802 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-21 21:33:16,802 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:33:16,805 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]
[2020-08-21 21:33:16,811 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 21:33:16,812 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:33:16,812 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:33:16,812 INFO  L82        PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times
[2020-08-21 21:33:16,812 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:33:16,813 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22131929]
[2020-08-21 21:33:16,813 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:33:16,952 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:17,417 WARN  L193               SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:33:17,418 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:33:17,424 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:17,573 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 21:33:17,573 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22131929]
[2020-08-21 21:33:17,573 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:33:17,574 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:33:17,574 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070825542]
[2020-08-21 21:33:17,575 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:33:17,575 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:33:17,575 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:33:17,575 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:33:17,575 INFO  L87              Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states.
[2020-08-21 21:33:26,104 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 21:33:26,104 INFO  L93              Difference]: Finished difference Result 46481 states and 71518 transitions.
[2020-08-21 21:33:26,105 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 21:33:26,105 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 320
[2020-08-21 21:33:26,105 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 21:33:26,173 INFO  L225             Difference]: With dead ends: 46481
[2020-08-21 21:33:26,173 INFO  L226             Difference]: Without dead ends: 30870
[2020-08-21 21:33:26,205 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
[2020-08-21 21:33:26,246 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30870 states.
[2020-08-21 21:33:27,251 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30870 to 30868.
[2020-08-21 21:33:27,251 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30868 states.
[2020-08-21 21:33:27,306 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30868 states to 30868 states and 47285 transitions.
[2020-08-21 21:33:27,306 INFO  L78                 Accepts]: Start accepts. Automaton has 30868 states and 47285 transitions. Word has length 320
[2020-08-21 21:33:27,306 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 21:33:27,307 INFO  L479      AbstractCegarLoop]: Abstraction has 30868 states and 47285 transitions.
[2020-08-21 21:33:27,307 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 21:33:27,307 INFO  L276                IsEmpty]: Start isEmpty. Operand 30868 states and 47285 transitions.
[2020-08-21 21:33:27,365 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 321
[2020-08-21 21:33:27,365 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 21:33:27,365 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]
[2020-08-21 21:33:27,366 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 21:33:27,366 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 21:33:27,366 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 21:33:27,366 INFO  L82        PathProgramCache]: Analyzing trace with hash -810813248, now seen corresponding path program 1 times
[2020-08-21 21:33:27,367 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 21:33:27,367 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490658443]
[2020-08-21 21:33:27,367 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 21:33:27,416 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:27,861 WARN  L193               SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 21:33:27,862 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 21:33:27,867 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 21:33:27,953 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 21:33:27,955 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490658443]
[2020-08-21 21:33:27,955 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 21:33:27,956 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 21:33:27,956 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347985540]
[2020-08-21 21:33:27,956 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 21:33:27,957 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 21:33:27,957 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 21:33:27,957 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 21:33:27,957 INFO  L87              Difference]: Start difference. First operand 30868 states and 47285 transitions. Second operand 4 states.