/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=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 18:19:05,763 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 18:19:05,766 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 18:19:05,791 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 18:19:05,791 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 18:19:05,792 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 18:19:05,794 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 18:19:05,795 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 18:19:05,797 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 18:19:05,798 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 18:19:05,799 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 18:19:05,800 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 18:19:05,800 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 18:19:05,801 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 18:19:05,802 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 18:19:05,803 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 18:19:05,804 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 18:19:05,805 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 18:19:05,806 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 18:19:05,808 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 18:19:05,810 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 18:19:05,811 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 18:19:05,812 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 18:19:05,813 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 18:19:05,815 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 18:19:05,816 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 18:19:05,816 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 18:19:05,817 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 18:19:05,817 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 18:19:05,818 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 18:19:05,818 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 18:19:05,819 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 18:19:05,820 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 18:19:05,820 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 18:19:05,821 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 18:19:05,821 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 18:19:05,825 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 18:19:05,825 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 18:19:05,825 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 18:19:05,826 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 18:19:05,827 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 18:19:05,828 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 18:19:05,850 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 18:19:05,851 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 18:19:05,852 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 18:19:05,852 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 18:19:05,852 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 18:19:05,853 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 18:19:05,853 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 18:19:05,853 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 18:19:05,853 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 18:19:05,854 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 18:19:05,854 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 18:19:05,854 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 18:19:05,854 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 18:19:05,854 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 18:19:05,855 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 18:19:05,855 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 18:19:05,855 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 18:19:05,855 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 18:19:05,856 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 18:19:05,856 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 18:19:05,856 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 18:19:05,856 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 18:19:05,856 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 18:19:05,857 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 18:19:05,857 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 18:19:05,857 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 18:19:05,857 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 18:19:05,857 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 18:19:05,858 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 18:19:05,858 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=LOWLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true;
[2020-08-21 18:19:06,227 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 18:19:06,241 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 18:19:06,245 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 18:19:06,246 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 18:19:06,247 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 18:19:06,247 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:06,311 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf6737e85/3f612c21bf944e8091c84954687fac42/FLAG7e4aebe3d
[2020-08-21 18:19:06,968 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 18:19:06,968 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:06,992 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf6737e85/3f612c21bf944e8091c84954687fac42/FLAG7e4aebe3d
[2020-08-21 18:19:07,188 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf6737e85/3f612c21bf944e8091c84954687fac42
[2020-08-21 18:19:07,199 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 18:19:07,201 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 18:19:07,202 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 18:19:07,202 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 18:19:07,207 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 18:19:07,209 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:07" (1/1) ...
[2020-08-21 18:19:07,212 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30829a49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:07, skipping insertion in model container
[2020-08-21 18:19:07,212 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:19:07" (1/1) ...
[2020-08-21 18:19:07,228 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 18:19:07,352 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 18:19:08,362 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:19:08,384 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 18:19:08,936 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:19:08,970 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 18:19:08,971 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08 WrapperNode
[2020-08-21 18:19:08,971 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 18:19:08,972 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 18:19:08,972 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 18:19:08,972 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 18:19:08,988 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:08,990 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,038 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,038 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,108 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,131 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,139 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (1/1) ...
[2020-08-21 18:19:09,153 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 18:19:09,153 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 18:19:09,153 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 18:19:09,154 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 18:19:09,155 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (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 18:19:09,220 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 18:19:09,220 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 18:19:09,221 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 18:19:09,221 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 18:19:09,221 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 18:19:09,221 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 18:19:09,222 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 18:19:09,222 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 18:19:09,222 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 18:19:09,222 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 18:19:09,222 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 18:19:09,223 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 18:19:09,223 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 18:19:09,223 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 18:19:09,223 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 18:19:09,223 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 18:19:09,224 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 18:19:09,224 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 18:19:09,224 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 18:19:09,225 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 18:19:09,225 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 18:19:09,225 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 18:19:11,928 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 18:19:11,929 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 18:19:11,939 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:11 BoogieIcfgContainer
[2020-08-21 18:19:11,940 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 18:19:11,941 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 18:19:11,941 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 18:19:11,945 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 18:19:11,946 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:19:07" (1/3) ...
[2020-08-21 18:19:11,947 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34d1198c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:11, skipping insertion in model container
[2020-08-21 18:19:11,947 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:19:08" (2/3) ...
[2020-08-21 18:19:11,948 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34d1198c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:19:11, skipping insertion in model container
[2020-08-21 18:19:11,948 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:19:11" (3/3) ...
[2020-08-21 18:19:11,951 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-21 18:19:11,962 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 18:19:11,971 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 18:19:11,986 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 18:19:12,015 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 18:19:12,015 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 18:19:12,015 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 18:19:12,016 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 18:19:12,016 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 18:19:12,016 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 18:19:12,016 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 18:19:12,016 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 18:19:12,056 INFO  L276                IsEmpty]: Start isEmpty. Operand 808 states.
[2020-08-21 18:19:12,083 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 18:19:12,083 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:12,085 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:12,085 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:12,092 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:12,093 INFO  L82        PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times
[2020-08-21 18:19:12,103 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:12,103 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367462411]
[2020-08-21 18:19:12,104 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:12,838 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:13,693 WARN  L193               SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:13,695 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:13,702 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:13,888 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 18:19:13,889 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367462411]
[2020-08-21 18:19:13,891 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:13,892 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:13,893 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437086924]
[2020-08-21 18:19:13,899 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:13,899 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:13,914 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:13,914 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:13,917 INFO  L87              Difference]: Start difference. First operand 808 states. Second operand 4 states.
[2020-08-21 18:19:14,425 WARN  L193               SmtUtils]: Spent 438.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 18:19:19,706 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:19,707 INFO  L93              Difference]: Finished difference Result 1527 states and 2683 transitions.
[2020-08-21 18:19:19,708 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 18:19:19,710 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 18:19:19,712 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:19,739 INFO  L225             Difference]: With dead ends: 1527
[2020-08-21 18:19:19,740 INFO  L226             Difference]: Without dead ends: 1311
[2020-08-21 18:19:19,746 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 18:19:19,765 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1311 states.
[2020-08-21 18:19:19,877 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309.
[2020-08-21 18:19:19,878 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1309 states.
[2020-08-21 18:19:19,886 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions.
[2020-08-21 18:19:19,888 INFO  L78                 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330
[2020-08-21 18:19:19,889 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:19,889 INFO  L479      AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions.
[2020-08-21 18:19:19,890 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:19,890 INFO  L276                IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions.
[2020-08-21 18:19:19,896 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 18:19:19,896 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:19,897 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:19,897 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 18:19:19,898 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:19,898 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:19,898 INFO  L82        PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times
[2020-08-21 18:19:19,899 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:19,899 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294166688]
[2020-08-21 18:19:19,899 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:20,088 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:20,877 WARN  L193               SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:20,879 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:20,886 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:21,166 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 18:19:21,167 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294166688]
[2020-08-21 18:19:21,167 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:21,168 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:21,168 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725313874]
[2020-08-21 18:19:21,172 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:21,172 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:21,173 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:21,173 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:21,173 INFO  L87              Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 4 states.
[2020-08-21 18:19:21,802 WARN  L193               SmtUtils]: Spent 575.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 18:19:26,296 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:26,296 INFO  L93              Difference]: Finished difference Result 2683 states and 4213 transitions.
[2020-08-21 18:19:26,297 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 18:19:26,297 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 18:19:26,300 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:26,323 INFO  L225             Difference]: With dead ends: 2683
[2020-08-21 18:19:26,325 INFO  L226             Difference]: Without dead ends: 2301
[2020-08-21 18:19:26,336 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-21 18:19:26,341 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2301 states.
[2020-08-21 18:19:26,449 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299.
[2020-08-21 18:19:26,451 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2299 states.
[2020-08-21 18:19:26,468 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions.
[2020-08-21 18:19:26,469 INFO  L78                 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330
[2020-08-21 18:19:26,471 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:26,471 INFO  L479      AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions.
[2020-08-21 18:19:26,471 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:26,472 INFO  L276                IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions.
[2020-08-21 18:19:26,487 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 18:19:26,492 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:26,494 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:26,494 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 18:19:26,495 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:26,495 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:26,495 INFO  L82        PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times
[2020-08-21 18:19:26,496 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:26,497 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234596893]
[2020-08-21 18:19:26,497 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:26,853 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:27,781 WARN  L193               SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:27,784 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:27,803 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:28,086 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 18:19:28,086 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234596893]
[2020-08-21 18:19:28,087 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:28,087 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:28,088 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916822204]
[2020-08-21 18:19:28,089 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:28,090 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:28,090 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:28,091 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:28,091 INFO  L87              Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 4 states.
[2020-08-21 18:19:28,507 WARN  L193               SmtUtils]: Spent 376.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-21 18:19:32,633 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:32,633 INFO  L93              Difference]: Finished difference Result 4867 states and 7634 transitions.
[2020-08-21 18:19:32,634 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 18:19:32,634 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-21 18:19:32,635 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:32,656 INFO  L225             Difference]: With dead ends: 4867
[2020-08-21 18:19:32,656 INFO  L226             Difference]: Without dead ends: 4201
[2020-08-21 18:19:32,659 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 18:19:32,666 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4201 states.
[2020-08-21 18:19:32,799 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199.
[2020-08-21 18:19:32,799 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4199 states.
[2020-08-21 18:19:32,814 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions.
[2020-08-21 18:19:32,814 INFO  L78                 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330
[2020-08-21 18:19:32,815 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:32,815 INFO  L479      AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions.
[2020-08-21 18:19:32,815 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:32,816 INFO  L276                IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions.
[2020-08-21 18:19:32,828 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-21 18:19:32,828 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:32,829 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:32,830 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-21 18:19:32,830 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:32,830 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:32,831 INFO  L82        PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times
[2020-08-21 18:19:32,832 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:32,832 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318661319]
[2020-08-21 18:19:32,833 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:33,299 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:33,891 WARN  L193               SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:33,896 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:33,905 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:34,089 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 18:19:34,089 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318661319]
[2020-08-21 18:19:34,090 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:34,090 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 18:19:34,090 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037574119]
[2020-08-21 18:19:34,091 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 18:19:34,091 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:34,092 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 18:19:34,092 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 18:19:34,092 INFO  L87              Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 5 states.
[2020-08-21 18:19:41,585 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:41,585 INFO  L93              Difference]: Finished difference Result 12414 states and 19245 transitions.
[2020-08-21 18:19:41,586 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-21 18:19:41,586 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 330
[2020-08-21 18:19:41,586 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:41,626 INFO  L225             Difference]: With dead ends: 12414
[2020-08-21 18:19:41,626 INFO  L226             Difference]: Without dead ends: 8230
[2020-08-21 18:19:41,637 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 18:19:41,647 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8230 states.
[2020-08-21 18:19:42,002 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8230 to 8228.
[2020-08-21 18:19:42,003 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8228 states.
[2020-08-21 18:19:42,037 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8228 states to 8228 states and 12694 transitions.
[2020-08-21 18:19:42,038 INFO  L78                 Accepts]: Start accepts. Automaton has 8228 states and 12694 transitions. Word has length 330
[2020-08-21 18:19:42,038 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:42,039 INFO  L479      AbstractCegarLoop]: Abstraction has 8228 states and 12694 transitions.
[2020-08-21 18:19:42,039 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 18:19:42,039 INFO  L276                IsEmpty]: Start isEmpty. Operand 8228 states and 12694 transitions.
[2020-08-21 18:19:42,059 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-21 18:19:42,059 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:42,060 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:42,060 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-21 18:19:42,061 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:42,061 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:42,061 INFO  L82        PathProgramCache]: Analyzing trace with hash 569689837, now seen corresponding path program 1 times
[2020-08-21 18:19:42,061 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:42,062 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176014024]
[2020-08-21 18:19:42,062 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:42,249 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:42,766 WARN  L193               SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:42,768 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:42,775 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:42,932 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 18:19:42,932 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176014024]
[2020-08-21 18:19:42,933 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:42,933 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:42,933 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786871999]
[2020-08-21 18:19:42,934 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:42,935 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:42,935 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:42,935 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:42,935 INFO  L87              Difference]: Start difference. First operand 8228 states and 12694 transitions. Second operand 4 states.
[2020-08-21 18:19:50,885 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:19:50,885 INFO  L93              Difference]: Finished difference Result 24233 states and 37318 transitions.
[2020-08-21 18:19:50,886 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:19:50,886 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-21 18:19:50,887 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:19:50,939 INFO  L225             Difference]: With dead ends: 24233
[2020-08-21 18:19:50,940 INFO  L226             Difference]: Without dead ends: 16134
[2020-08-21 18:19:50,958 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 18:19:50,977 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16134 states.
[2020-08-21 18:19:51,560 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16134 to 16132.
[2020-08-21 18:19:51,560 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16132 states.
[2020-08-21 18:19:51,589 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 24741 transitions.
[2020-08-21 18:19:51,589 INFO  L78                 Accepts]: Start accepts. Automaton has 16132 states and 24741 transitions. Word has length 332
[2020-08-21 18:19:51,590 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:19:51,590 INFO  L479      AbstractCegarLoop]: Abstraction has 16132 states and 24741 transitions.
[2020-08-21 18:19:51,590 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:19:51,590 INFO  L276                IsEmpty]: Start isEmpty. Operand 16132 states and 24741 transitions.
[2020-08-21 18:19:51,624 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-21 18:19:51,624 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:19:51,625 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:19:51,626 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-21 18:19:51,630 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:19:51,630 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:19:51,630 INFO  L82        PathProgramCache]: Analyzing trace with hash -310142286, now seen corresponding path program 1 times
[2020-08-21 18:19:51,631 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:19:51,631 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670574833]
[2020-08-21 18:19:51,631 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:19:51,684 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:52,156 WARN  L193               SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:19:52,157 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:19:52,164 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:19:52,249 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 18:19:52,249 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670574833]
[2020-08-21 18:19:52,250 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:19:52,250 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:19:52,250 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362371135]
[2020-08-21 18:19:52,251 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:19:52,251 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:19:52,251 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:19:52,252 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:19:52,252 INFO  L87              Difference]: Start difference. First operand 16132 states and 24741 transitions. Second operand 4 states.
[2020-08-21 18:20:01,179 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 18:20:01,179 INFO  L93              Difference]: Finished difference Result 48321 states and 74099 transitions.
[2020-08-21 18:20:01,180 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 18:20:01,180 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-21 18:20:01,180 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 18:20:01,257 INFO  L225             Difference]: With dead ends: 48321
[2020-08-21 18:20:01,257 INFO  L226             Difference]: Without dead ends: 32231
[2020-08-21 18:20:01,294 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 18:20:01,330 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 32231 states.
[2020-08-21 18:20:01,970 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 32231 to 16151.
[2020-08-21 18:20:01,970 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16151 states.
[2020-08-21 18:20:01,991 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16151 states to 16151 states and 24769 transitions.
[2020-08-21 18:20:01,991 INFO  L78                 Accepts]: Start accepts. Automaton has 16151 states and 24769 transitions. Word has length 332
[2020-08-21 18:20:01,991 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 18:20:01,992 INFO  L479      AbstractCegarLoop]: Abstraction has 16151 states and 24769 transitions.
[2020-08-21 18:20:01,992 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 18:20:01,992 INFO  L276                IsEmpty]: Start isEmpty. Operand 16151 states and 24769 transitions.
[2020-08-21 18:20:02,020 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 334
[2020-08-21 18:20:02,021 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:20:02,021 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:20:02,021 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-21 18:20:02,022 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:20:02,022 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:20:02,022 INFO  L82        PathProgramCache]: Analyzing trace with hash -1868318850, now seen corresponding path program 1 times
[2020-08-21 18:20:02,022 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:20:02,023 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517087293]
[2020-08-21 18:20:02,023 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:20:02,060 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:02,500 WARN  L193               SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-21 18:20:02,502 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 18:20:02,508 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 18:20:02,602 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 18:20:02,602 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517087293]
[2020-08-21 18:20:02,602 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 18:20:02,603 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 18:20:02,603 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207529462]
[2020-08-21 18:20:02,604 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 18:20:02,604 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 18:20:02,604 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 18:20:02,604 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 18:20:02,604 INFO  L87              Difference]: Start difference. First operand 16151 states and 24769 transitions. Second operand 4 states.