/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=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 13:07:06,452 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 13:07:06,456 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 13:07:06,494 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 13:07:06,495 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 13:07:06,504 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 13:07:06,506 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 13:07:06,509 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 13:07:06,512 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 13:07:06,515 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 13:07:06,516 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 13:07:06,517 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 13:07:06,517 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 13:07:06,520 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 13:07:06,522 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 13:07:06,524 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 13:07:06,525 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 13:07:06,526 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 13:07:06,527 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 13:07:06,535 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 13:07:06,537 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 13:07:06,538 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 13:07:06,539 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 13:07:06,540 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 13:07:06,552 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 13:07:06,552 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 13:07:06,552 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 13:07:06,555 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 13:07:06,556 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 13:07:06,557 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 13:07:06,558 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 13:07:06,558 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 13:07:06,559 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 13:07:06,561 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 13:07:06,562 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 13:07:06,562 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 13:07:06,563 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 13:07:06,563 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 13:07:06,563 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 13:07:06,564 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 13:07:06,565 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 13:07:06,566 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 13:07:06,604 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 13:07:06,604 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 13:07:06,606 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 13:07:06,607 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 13:07:06,607 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 13:07:06,607 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 13:07:06,607 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 13:07:06,608 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 13:07:06,608 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 13:07:06,608 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 13:07:06,609 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 13:07:06,609 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 13:07:06,609 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 13:07:06,610 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 13:07:06,610 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 13:07:06,610 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 13:07:06,610 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 13:07:06,611 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 13:07:06,611 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 13:07:06,611 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 13:07:06,611 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 13:07:06,611 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 13:07:06,612 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 13:07:06,612 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 13:07:06,612 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 13:07:06,612 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 13:07:06,612 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 13:07:06,612 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 13:07:06,613 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 13:07:06,613 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=BIGGEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST;
[2020-08-18 13:07:06,924 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 13:07:06,942 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 13:07:06,947 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 13:07:06,949 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 13:07:06,950 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 13:07:06,951 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 13:07:07,029 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0694a6c9d/069ae3fdec2a4fd693265201f08e70b1/FLAG4a73e6169
[2020-08-18 13:07:07,678 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 13:07:07,679 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 13:07:07,700 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0694a6c9d/069ae3fdec2a4fd693265201f08e70b1/FLAG4a73e6169
[2020-08-18 13:07:07,988 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0694a6c9d/069ae3fdec2a4fd693265201f08e70b1
[2020-08-18 13:07:07,997 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 13:07:07,998 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 13:07:07,999 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 13:07:08,000 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 13:07:08,003 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 13:07:08,004 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:07:07" (1/1) ...
[2020-08-18 13:07:08,007 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1efc8eb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:08, skipping insertion in model container
[2020-08-18 13:07:08,008 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:07:07" (1/1) ...
[2020-08-18 13:07:08,016 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 13:07:08,129 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 13:07:09,124 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:07:09,140 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 13:07:09,625 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:07:09,656 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 13:07:09,658 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09 WrapperNode
[2020-08-18 13:07:09,658 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 13:07:09,659 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 13:07:09,659 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 13:07:09,659 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 13:07:09,674 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,677 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,714 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,715 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,780 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,831 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,848 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (1/1) ...
[2020-08-18 13:07:09,873 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 13:07:09,873 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 13:07:09,874 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 13:07:09,874 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 13:07:09,875 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (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 13:07:09,953 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 13:07:09,953 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 13:07:09,953 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 13:07:09,954 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 13:07:09,954 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 13:07:09,956 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 13:07:09,956 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 13:07:09,956 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 13:07:09,956 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 13:07:09,956 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 13:07:09,957 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 13:07:09,958 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 13:07:09,958 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 13:07:09,958 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 13:07:09,958 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 13:07:09,959 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 13:07:09,960 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 13:07:09,960 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 13:07:09,960 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 13:07:09,960 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 13:07:09,961 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 13:07:09,961 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 13:07:12,500 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 13:07:12,500 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 13:07:12,515 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:07:12 BoogieIcfgContainer
[2020-08-18 13:07:12,515 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 13:07:12,517 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 13:07:12,517 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 13:07:12,520 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 13:07:12,520 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:07:07" (1/3) ...
[2020-08-18 13:07:12,521 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12e1df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:07:12, skipping insertion in model container
[2020-08-18 13:07:12,521 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:07:09" (2/3) ...
[2020-08-18 13:07:12,522 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12e1df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:07:12, skipping insertion in model container
[2020-08-18 13:07:12,522 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:07:12" (3/3) ...
[2020-08-18 13:07:12,524 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c
[2020-08-18 13:07:12,536 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 13:07:12,548 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 13:07:12,562 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 13:07:12,591 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 13:07:12,591 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 13:07:12,591 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 13:07:12,592 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 13:07:12,592 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 13:07:12,592 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 13:07:12,592 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 13:07:12,592 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 13:07:12,625 INFO  L276                IsEmpty]: Start isEmpty. Operand 789 states.
[2020-08-18 13:07:12,687 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 13:07:12,688 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:12,689 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:12,690 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:12,696 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:12,696 INFO  L82        PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times
[2020-08-18 13:07:12,705 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:12,706 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364088798]
[2020-08-18 13:07:12,706 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:13,366 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:14,508 WARN  L193               SmtUtils]: Spent 736.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:14,518 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:14,528 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:14,732 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 13:07:14,733 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364088798]
[2020-08-18 13:07:14,735 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:14,735 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:14,736 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410897193]
[2020-08-18 13:07:14,742 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:14,743 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:14,756 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:14,757 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:14,760 INFO  L87              Difference]: Start difference. First operand 789 states. Second operand 4 states.
[2020-08-18 13:07:15,224 WARN  L193               SmtUtils]: Spent 399.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 13:07:20,185 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:20,185 INFO  L93              Difference]: Finished difference Result 1489 states and 2621 transitions.
[2020-08-18 13:07:20,187 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 13:07:20,188 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 13:07:20,190 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:20,233 INFO  L225             Difference]: With dead ends: 1489
[2020-08-18 13:07:20,233 INFO  L226             Difference]: Without dead ends: 1273
[2020-08-18 13:07:20,241 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 13:07:20,266 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1273 states.
[2020-08-18 13:07:20,385 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271.
[2020-08-18 13:07:20,386 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1271 states.
[2020-08-18 13:07:20,392 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions.
[2020-08-18 13:07:20,394 INFO  L78                 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326
[2020-08-18 13:07:20,396 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:20,396 INFO  L479      AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions.
[2020-08-18 13:07:20,396 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:20,396 INFO  L276                IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions.
[2020-08-18 13:07:20,405 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 13:07:20,406 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:20,406 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:20,407 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 13:07:20,407 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:20,407 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:20,407 INFO  L82        PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times
[2020-08-18 13:07:20,408 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:20,408 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005621906]
[2020-08-18 13:07:20,408 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:20,575 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:21,122 WARN  L193               SmtUtils]: Spent 352.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:21,124 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:21,130 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:21,460 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 13:07:21,461 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005621906]
[2020-08-18 13:07:21,462 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:21,462 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:21,463 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604888774]
[2020-08-18 13:07:21,467 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:21,468 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:21,468 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:21,469 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:21,469 INFO  L87              Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states.
[2020-08-18 13:07:22,090 WARN  L193               SmtUtils]: Spent 564.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 13:07:26,410 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:26,410 INFO  L93              Difference]: Finished difference Result 2607 states and 4089 transitions.
[2020-08-18 13:07:26,411 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 13:07:26,411 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 13:07:26,415 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:26,434 INFO  L225             Difference]: With dead ends: 2607
[2020-08-18 13:07:26,435 INFO  L226             Difference]: Without dead ends: 2225
[2020-08-18 13:07:26,445 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
[2020-08-18 13:07:26,451 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2225 states.
[2020-08-18 13:07:26,553 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223.
[2020-08-18 13:07:26,555 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2223 states.
[2020-08-18 13:07:26,571 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions.
[2020-08-18 13:07:26,571 INFO  L78                 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326
[2020-08-18 13:07:26,574 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:26,574 INFO  L479      AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions.
[2020-08-18 13:07:26,574 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:26,574 INFO  L276                IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions.
[2020-08-18 13:07:26,590 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 13:07:26,591 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:26,596 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:26,596 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 13:07:26,597 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:26,597 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:26,597 INFO  L82        PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times
[2020-08-18 13:07:26,599 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:26,600 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16728730]
[2020-08-18 13:07:26,600 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:26,942 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:27,918 WARN  L193               SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:27,920 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:27,930 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:28,218 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 13:07:28,219 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16728730]
[2020-08-18 13:07:28,220 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:28,220 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:28,220 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965529416]
[2020-08-18 13:07:28,221 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:28,223 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:28,223 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:28,224 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:28,224 INFO  L87              Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states.
[2020-08-18 13:07:28,756 WARN  L193               SmtUtils]: Spent 477.00 ms on a formula simplification that was a NOOP. DAG size: 278
[2020-08-18 13:07:32,726 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:32,726 INFO  L93              Difference]: Finished difference Result 4715 states and 7386 transitions.
[2020-08-18 13:07:32,727 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 13:07:32,727 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 326
[2020-08-18 13:07:32,728 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:32,749 INFO  L225             Difference]: With dead ends: 4715
[2020-08-18 13:07:32,749 INFO  L226             Difference]: Without dead ends: 4049
[2020-08-18 13:07:32,751 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 13:07:32,756 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 4049 states.
[2020-08-18 13:07:32,865 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047.
[2020-08-18 13:07:32,865 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 4047 states.
[2020-08-18 13:07:32,878 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions.
[2020-08-18 13:07:32,878 INFO  L78                 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326
[2020-08-18 13:07:32,879 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:32,879 INFO  L479      AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions.
[2020-08-18 13:07:32,879 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:32,880 INFO  L276                IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions.
[2020-08-18 13:07:32,890 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 327
[2020-08-18 13:07:32,890 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:32,890 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:32,891 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 13:07:32,891 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:32,891 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:32,891 INFO  L82        PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times
[2020-08-18 13:07:32,892 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:32,892 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641070422]
[2020-08-18 13:07:32,892 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:33,285 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:33,875 WARN  L193               SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:33,877 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:33,883 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:34,081 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 13:07:34,081 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641070422]
[2020-08-18 13:07:34,082 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:34,082 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 13:07:34,082 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133472389]
[2020-08-18 13:07:34,083 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 13:07:34,083 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:34,083 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 13:07:34,084 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 13:07:34,084 INFO  L87              Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states.
[2020-08-18 13:07:40,822 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:40,822 INFO  L93              Difference]: Finished difference Result 11998 states and 18565 transitions.
[2020-08-18 13:07:40,823 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 13:07:40,823 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 326
[2020-08-18 13:07:40,824 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:40,859 INFO  L225             Difference]: With dead ends: 11998
[2020-08-18 13:07:40,859 INFO  L226             Difference]: Without dead ends: 7966
[2020-08-18 13:07:40,866 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 13:07:40,875 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7966 states.
[2020-08-18 13:07:41,160 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964.
[2020-08-18 13:07:41,161 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7964 states.
[2020-08-18 13:07:41,185 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions.
[2020-08-18 13:07:41,185 INFO  L78                 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326
[2020-08-18 13:07:41,185 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:41,186 INFO  L479      AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions.
[2020-08-18 13:07:41,186 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 13:07:41,186 INFO  L276                IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions.
[2020-08-18 13:07:41,207 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 13:07:41,208 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:41,208 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]
[2020-08-18 13:07:41,209 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 13:07:41,209 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:41,209 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:41,210 INFO  L82        PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times
[2020-08-18 13:07:41,210 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:41,210 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409593925]
[2020-08-18 13:07:41,211 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:41,339 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:41,861 WARN  L193               SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:41,862 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:41,868 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:42,015 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 13:07:42,016 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409593925]
[2020-08-18 13:07:42,016 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:42,016 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:42,017 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485106621]
[2020-08-18 13:07:42,017 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:42,018 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:42,018 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:42,018 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:42,018 INFO  L87              Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states.
[2020-08-18 13:07:49,594 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:49,594 INFO  L93              Difference]: Finished difference Result 23441 states and 36046 transitions.
[2020-08-18 13:07:49,595 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 13:07:49,595 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 13:07:49,595 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:49,656 INFO  L225             Difference]: With dead ends: 23441
[2020-08-18 13:07:49,657 INFO  L226             Difference]: Without dead ends: 15606
[2020-08-18 13:07:49,676 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 13:07:49,695 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15606 states.
[2020-08-18 13:07:50,237 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604.
[2020-08-18 13:07:50,237 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15604 states.
[2020-08-18 13:07:50,266 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions.
[2020-08-18 13:07:50,267 INFO  L78                 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328
[2020-08-18 13:07:50,267 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:50,267 INFO  L479      AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions.
[2020-08-18 13:07:50,268 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:50,268 INFO  L276                IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions.
[2020-08-18 13:07:50,298 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 329
[2020-08-18 13:07:50,298 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:50,298 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:50,299 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 13:07:50,300 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:50,304 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:50,305 INFO  L82        PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times
[2020-08-18 13:07:50,305 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:50,305 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285176501]
[2020-08-18 13:07:50,306 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:50,367 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:50,880 WARN  L193               SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:07:50,881 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:50,886 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:50,969 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 13:07:50,970 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285176501]
[2020-08-18 13:07:50,970 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:50,970 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:50,971 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189260872]
[2020-08-18 13:07:50,971 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:50,972 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:50,972 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:50,972 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:50,972 INFO  L87              Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states.
[2020-08-18 13:07:58,893 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:58,894 INFO  L93              Difference]: Finished difference Result 46737 states and 71555 transitions.
[2020-08-18 13:07:58,894 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 13:07:58,895 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 328
[2020-08-18 13:07:58,895 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:58,961 INFO  L225             Difference]: With dead ends: 46737
[2020-08-18 13:07:58,962 INFO  L226             Difference]: Without dead ends: 31175
[2020-08-18 13:07:58,993 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 13:07:59,027 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31175 states.
[2020-08-18 13:07:59,894 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623.
[2020-08-18 13:07:59,894 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15623 states.
[2020-08-18 13:07:59,920 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions.
[2020-08-18 13:07:59,921 INFO  L78                 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328
[2020-08-18 13:07:59,921 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:59,921 INFO  L479      AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions.
[2020-08-18 13:07:59,921 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:59,922 INFO  L276                IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions.
[2020-08-18 13:07:59,950 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 330
[2020-08-18 13:07:59,950 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:59,951 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:07:59,951 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 13:07:59,951 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:59,952 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:59,952 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times
[2020-08-18 13:07:59,952 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:59,952 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938672007]
[2020-08-18 13:07:59,953 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:59,987 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:08:00,432 WARN  L193               SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 277
[2020-08-18 13:08:00,434 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:08:00,441 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:08:00,523 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 13:08:00,524 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938672007]
[2020-08-18 13:08:00,524 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:08:00,524 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:08:00,525 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34511756]
[2020-08-18 13:08:00,525 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:08:00,525 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:08:00,526 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:08:00,526 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:08:00,526 INFO  L87              Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.