/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -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 0.1.25-5644d1e-m
[2020-08-18 20:28:32,749 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 20:28:32,752 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 20:28:32,789 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 20:28:32,789 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 20:28:32,799 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 20:28:32,801 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 20:28:32,805 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 20:28:32,807 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 20:28:32,810 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 20:28:32,811 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 20:28:32,812 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 20:28:32,812 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 20:28:32,815 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 20:28:32,817 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 20:28:32,819 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 20:28:32,820 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 20:28:32,822 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 20:28:32,823 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 20:28:32,831 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 20:28:32,833 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 20:28:32,834 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 20:28:32,835 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 20:28:32,836 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 20:28:32,851 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 20:28:32,851 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 20:28:32,851 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 20:28:32,852 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 20:28:32,853 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 20:28:32,857 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 20:28:32,857 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 20:28:32,857 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 20:28:32,862 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 20:28:32,863 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 20:28:32,864 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 20:28:32,864 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 20:28:32,865 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 20:28:32,865 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 20:28:32,867 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 20:28:32,868 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 20:28:32,904 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 20:28:32,904 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 20:28:32,906 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 20:28:32,906 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 20:28:32,907 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 20:28:32,907 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 20:28:32,907 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 20:28:32,907 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 20:28:32,908 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 20:28:32,908 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 20:28:32,909 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 20:28:32,909 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 20:28:32,909 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 20:28:32,910 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 20:28:32,910 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 20:28:32,910 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 20:28:32,910 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 20:28:32,910 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 20:28:32,911 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 20:28:32,911 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 20:28:32,911 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 20:28:32,911 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:28:32,911 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 20:28:32,912 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 20:28:32,912 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 20:28:32,912 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 20:28:32,912 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 20:28:32,912 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 20:28:32,913 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 20:28:32,913 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
[2020-08-18 20:28:33,248 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 20:28:33,258 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 20:28:33,263 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 20:28:33,264 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 20:28:33,264 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 20:28:33,265 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 20:28:33,322 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/554cdefc0/2f5624d8902e4d248785208d1162a8c6/FLAGbb6ed7bcf
[2020-08-18 20:28:33,958 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 20:28:33,958 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 20:28:33,978 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/554cdefc0/2f5624d8902e4d248785208d1162a8c6/FLAGbb6ed7bcf
[2020-08-18 20:28:34,155 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/554cdefc0/2f5624d8902e4d248785208d1162a8c6
[2020-08-18 20:28:34,163 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 20:28:34,164 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 20:28:34,167 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 20:28:34,167 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 20:28:34,171 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 20:28:34,172 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:28:34" (1/1) ...
[2020-08-18 20:28:34,175 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10865b9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:34, skipping insertion in model container
[2020-08-18 20:28:34,176 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:28:34" (1/1) ...
[2020-08-18 20:28:34,184 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 20:28:34,293 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 20:28:35,340 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:28:35,357 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 20:28:35,838 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:28:35,878 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 20:28:35,879 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35 WrapperNode
[2020-08-18 20:28:35,880 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 20:28:35,881 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 20:28:35,881 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 20:28:35,881 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 20:28:35,904 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:35,907 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:35,966 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:35,966 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:36,022 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:36,062 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:36,071 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
[2020-08-18 20:28:36,094 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 20:28:36,095 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 20:28:36,095 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 20:28:36,096 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 20:28:36,098 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:28:36,201 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 20:28:36,202 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 20:28:36,202 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 20:28:36,202 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 20:28:36,202 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 20:28:36,203 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 20:28:36,203 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 20:28:36,203 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 20:28:36,203 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 20:28:36,204 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 20:28:36,204 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 20:28:36,204 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 20:28:36,204 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 20:28:36,205 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 20:28:36,205 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 20:28:36,205 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 20:28:36,205 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 20:28:36,206 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 20:28:36,206 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 20:28:36,206 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 20:28:36,206 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 20:28:36,207 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 20:28:39,042 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 20:28:39,043 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 20:28:39,054 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:28:39 BoogieIcfgContainer
[2020-08-18 20:28:39,054 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 20:28:39,056 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 20:28:39,056 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 20:28:39,059 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 20:28:39,060 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:28:34" (1/3) ...
[2020-08-18 20:28:39,061 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c7bd058 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:28:39, skipping insertion in model container
[2020-08-18 20:28:39,061 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:28:35" (2/3) ...
[2020-08-18 20:28:39,061 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c7bd058 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:28:39, skipping insertion in model container
[2020-08-18 20:28:39,061 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:28:39" (3/3) ...
[2020-08-18 20:28:39,063 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 20:28:39,076 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 20:28:39,091 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 20:28:39,105 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 20:28:39,132 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 20:28:39,133 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 20:28:39,133 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 20:28:39,133 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 20:28:39,133 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 20:28:39,133 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 20:28:39,133 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 20:28:39,134 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 20:28:39,168 INFO  L276                IsEmpty]: Start isEmpty. Operand 808 states.
[2020-08-18 20:28:39,198 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-18 20:28:39,198 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:39,199 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]
[2020-08-18 20:28:39,200 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:39,206 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:39,207 INFO  L82        PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times
[2020-08-18 20:28:39,216 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:39,216 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236501480]
[2020-08-18 20:28:39,217 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:39,903 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:41,123 WARN  L193               SmtUtils]: Spent 735.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:28:41,126 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:41,133 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:41,349 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:28:41,350 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236501480]
[2020-08-18 20:28:41,352 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:41,353 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:28:41,353 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403862653]
[2020-08-18 20:28:41,360 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:28:41,360 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:41,374 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:28:41,375 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:41,377 INFO  L87              Difference]: Start difference. First operand 808 states. Second operand 4 states.
[2020-08-18 20:28:42,147 WARN  L193               SmtUtils]: Spent 700.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 20:28:47,371 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:28:47,371 INFO  L93              Difference]: Finished difference Result 1527 states and 2683 transitions.
[2020-08-18 20:28:47,372 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 20:28:47,374 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-18 20:28:47,377 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:28:47,419 INFO  L225             Difference]: With dead ends: 1527
[2020-08-18 20:28:47,419 INFO  L226             Difference]: Without dead ends: 1311
[2020-08-18 20:28:47,427 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 20:28:47,452 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1311 states.
[2020-08-18 20:28:47,557 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309.
[2020-08-18 20:28:47,559 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1309 states.
[2020-08-18 20:28:47,566 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions.
[2020-08-18 20:28:47,568 INFO  L78                 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330
[2020-08-18 20:28:47,569 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:28:47,570 INFO  L479      AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions.
[2020-08-18 20:28:47,570 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:28:47,570 INFO  L276                IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions.
[2020-08-18 20:28:47,579 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-18 20:28:47,579 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:47,580 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]
[2020-08-18 20:28:47,580 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 20:28:47,580 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:47,581 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:47,581 INFO  L82        PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times
[2020-08-18 20:28:47,581 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:47,581 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644831792]
[2020-08-18 20:28:47,582 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:47,760 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:48,535 WARN  L193               SmtUtils]: Spent 566.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:28:48,536 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:48,543 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:48,795 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:28:48,795 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644831792]
[2020-08-18 20:28:48,796 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:48,796 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:28:48,797 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519433315]
[2020-08-18 20:28:48,799 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:28:48,800 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:48,800 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:28:48,801 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:48,801 INFO  L87              Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 4 states.
[2020-08-18 20:28:49,449 WARN  L193               SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 20:28:53,642 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:28:53,643 INFO  L93              Difference]: Finished difference Result 2683 states and 4213 transitions.
[2020-08-18 20:28:53,643 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 20:28:53,644 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-18 20:28:53,646 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:28:53,660 INFO  L225             Difference]: With dead ends: 2683
[2020-08-18 20:28:53,661 INFO  L226             Difference]: Without dead ends: 2301
[2020-08-18 20:28:53,668 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
[2020-08-18 20:28:53,673 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2301 states.
[2020-08-18 20:28:53,745 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299.
[2020-08-18 20:28:53,746 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2299 states.
[2020-08-18 20:28:53,758 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions.
[2020-08-18 20:28:53,758 INFO  L78                 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330
[2020-08-18 20:28:53,760 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:28:53,760 INFO  L479      AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions.
[2020-08-18 20:28:53,760 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:28:53,760 INFO  L276                IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions.
[2020-08-18 20:28:53,768 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-18 20:28:53,770 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:53,773 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]
[2020-08-18 20:28:53,774 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 20:28:53,774 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:53,774 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:53,775 INFO  L82        PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times
[2020-08-18 20:28:53,775 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:53,775 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387201213]
[2020-08-18 20:28:53,776 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:53,978 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:54,668 WARN  L193               SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:28:54,670 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:54,676 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:54,833 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:28:54,833 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387201213]
[2020-08-18 20:28:54,834 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:54,835 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:28:54,835 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098071958]
[2020-08-18 20:28:54,836 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:28:54,837 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:54,837 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:28:54,838 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:54,838 INFO  L87              Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 4 states.
[2020-08-18 20:28:55,239 WARN  L193               SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 20:28:59,602 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:28:59,603 INFO  L93              Difference]: Finished difference Result 4867 states and 7634 transitions.
[2020-08-18 20:28:59,603 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 20:28:59,604 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 330
[2020-08-18 20:28:59,605 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:28:59,626 INFO  L225             Difference]: With dead ends: 4867
[2020-08-18 20:28:59,626 INFO  L226             Difference]: Without dead ends: 4201
[2020-08-18 20:28:59,629 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
[2020-08-18 20:28:59,635 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4201 states.
[2020-08-18 20:28:59,751 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199.
[2020-08-18 20:28:59,751 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4199 states.
[2020-08-18 20:28:59,763 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions.
[2020-08-18 20:28:59,764 INFO  L78                 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330
[2020-08-18 20:28:59,764 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:28:59,765 INFO  L479      AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions.
[2020-08-18 20:28:59,765 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:28:59,765 INFO  L276                IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions.
[2020-08-18 20:28:59,772 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 331
[2020-08-18 20:28:59,773 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:59,773 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]
[2020-08-18 20:28:59,773 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 20:28:59,774 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:59,774 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:59,774 INFO  L82        PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times
[2020-08-18 20:28:59,775 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:59,775 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058368798]
[2020-08-18 20:28:59,775 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:29:00,161 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:00,737 WARN  L193               SmtUtils]: Spent 402.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:29:00,738 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:29:00,744 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:00,956 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:29:00,957 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058368798]
[2020-08-18 20:29:00,957 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:29:00,958 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 20:29:00,958 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438191179]
[2020-08-18 20:29:00,959 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 20:29:00,959 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:29:00,959 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 20:29:00,960 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 20:29:00,960 INFO  L87              Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 5 states.
[2020-08-18 20:29:07,845 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:29:07,846 INFO  L93              Difference]: Finished difference Result 12414 states and 19245 transitions.
[2020-08-18 20:29:07,846 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 20:29:07,847 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 330
[2020-08-18 20:29:07,847 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:29:07,884 INFO  L225             Difference]: With dead ends: 12414
[2020-08-18 20:29:07,885 INFO  L226             Difference]: Without dead ends: 8230
[2020-08-18 20:29:07,893 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
[2020-08-18 20:29:07,902 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8230 states.
[2020-08-18 20:29:08,167 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8230 to 8228.
[2020-08-18 20:29:08,167 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 8228 states.
[2020-08-18 20:29:08,190 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 8228 states to 8228 states and 12694 transitions.
[2020-08-18 20:29:08,191 INFO  L78                 Accepts]: Start accepts. Automaton has 8228 states and 12694 transitions. Word has length 330
[2020-08-18 20:29:08,191 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:29:08,191 INFO  L479      AbstractCegarLoop]: Abstraction has 8228 states and 12694 transitions.
[2020-08-18 20:29:08,192 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 20:29:08,192 INFO  L276                IsEmpty]: Start isEmpty. Operand 8228 states and 12694 transitions.
[2020-08-18 20:29:08,207 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-18 20:29:08,207 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:29:08,208 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]
[2020-08-18 20:29:08,208 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 20:29:08,209 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:29:08,209 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:29:08,209 INFO  L82        PathProgramCache]: Analyzing trace with hash 569689837, now seen corresponding path program 1 times
[2020-08-18 20:29:08,209 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:29:08,210 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5572377]
[2020-08-18 20:29:08,210 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:29:08,315 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:08,847 WARN  L193               SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:29:08,849 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:29:08,855 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:09,001 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:29:09,001 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5572377]
[2020-08-18 20:29:09,001 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:29:09,001 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:29:09,002 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864855436]
[2020-08-18 20:29:09,002 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:29:09,003 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:29:09,003 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:29:09,003 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:29:09,003 INFO  L87              Difference]: Start difference. First operand 8228 states and 12694 transitions. Second operand 4 states.
[2020-08-18 20:29:16,842 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:29:16,842 INFO  L93              Difference]: Finished difference Result 24233 states and 37318 transitions.
[2020-08-18 20:29:16,843 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 20:29:16,843 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-18 20:29:16,844 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:29:16,899 INFO  L225             Difference]: With dead ends: 24233
[2020-08-18 20:29:16,899 INFO  L226             Difference]: Without dead ends: 16134
[2020-08-18 20:29:16,914 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:29:16,929 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16134 states.
[2020-08-18 20:29:17,333 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16134 to 16132.
[2020-08-18 20:29:17,334 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16132 states.
[2020-08-18 20:29:17,360 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 24741 transitions.
[2020-08-18 20:29:17,361 INFO  L78                 Accepts]: Start accepts. Automaton has 16132 states and 24741 transitions. Word has length 332
[2020-08-18 20:29:17,361 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:29:17,361 INFO  L479      AbstractCegarLoop]: Abstraction has 16132 states and 24741 transitions.
[2020-08-18 20:29:17,362 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:29:17,362 INFO  L276                IsEmpty]: Start isEmpty. Operand 16132 states and 24741 transitions.
[2020-08-18 20:29:17,391 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 333
[2020-08-18 20:29:17,391 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:29:17,391 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]
[2020-08-18 20:29:17,392 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 20:29:17,393 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:29:17,397 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:29:17,398 INFO  L82        PathProgramCache]: Analyzing trace with hash -310142286, now seen corresponding path program 1 times
[2020-08-18 20:29:17,398 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:29:17,398 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656928873]
[2020-08-18 20:29:17,398 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:29:17,447 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:18,069 WARN  L193               SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:29:18,070 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:29:18,077 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:18,242 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:29:18,242 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656928873]
[2020-08-18 20:29:18,243 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:29:18,250 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:29:18,251 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617930627]
[2020-08-18 20:29:18,252 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:29:18,252 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:29:18,252 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:29:18,252 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:29:18,253 INFO  L87              Difference]: Start difference. First operand 16132 states and 24741 transitions. Second operand 4 states.
[2020-08-18 20:29:27,119 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:29:27,120 INFO  L93              Difference]: Finished difference Result 48321 states and 74099 transitions.
[2020-08-18 20:29:27,120 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 20:29:27,121 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 332
[2020-08-18 20:29:27,121 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:29:27,185 INFO  L225             Difference]: With dead ends: 48321
[2020-08-18 20:29:27,185 INFO  L226             Difference]: Without dead ends: 32231
[2020-08-18 20:29:27,215 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:29:27,245 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 32231 states.
[2020-08-18 20:29:27,797 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 32231 to 16151.
[2020-08-18 20:29:27,797 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16151 states.
[2020-08-18 20:29:27,815 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16151 states to 16151 states and 24769 transitions.
[2020-08-18 20:29:27,815 INFO  L78                 Accepts]: Start accepts. Automaton has 16151 states and 24769 transitions. Word has length 332
[2020-08-18 20:29:27,816 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:29:27,816 INFO  L479      AbstractCegarLoop]: Abstraction has 16151 states and 24769 transitions.
[2020-08-18 20:29:27,816 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:29:27,816 INFO  L276                IsEmpty]: Start isEmpty. Operand 16151 states and 24769 transitions.
[2020-08-18 20:29:27,841 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 334
[2020-08-18 20:29:27,842 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:29:27,842 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]
[2020-08-18 20:29:27,842 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 20:29:27,842 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:29:27,843 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:29:27,843 INFO  L82        PathProgramCache]: Analyzing trace with hash -1868318850, now seen corresponding path program 1 times
[2020-08-18 20:29:27,843 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:29:27,843 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970362370]
[2020-08-18 20:29:27,844 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:29:27,878 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:28,315 WARN  L193               SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 20:29:28,316 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:29:28,320 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:29:28,479 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:29:28,480 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970362370]
[2020-08-18 20:29:28,480 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:29:28,480 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:29:28,481 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2998661]
[2020-08-18 20:29:28,481 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:29:28,482 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:29:28,482 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:29:28,482 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:29:28,482 INFO  L87              Difference]: Start difference. First operand 16151 states and 24769 transitions. Second operand 4 states.