/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/loop-invgen/sendmail-close-angle.i


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 13:04:39,645 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 13:04:39,649 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 13:04:39,686 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 13:04:39,687 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 13:04:39,696 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 13:04:39,698 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 13:04:39,702 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 13:04:39,704 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 13:04:39,707 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 13:04:39,708 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 13:04:39,709 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 13:04:39,709 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 13:04:39,711 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 13:04:39,714 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 13:04:39,715 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 13:04:39,717 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 13:04:39,719 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 13:04:39,720 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 13:04:39,730 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 13:04:39,732 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 13:04:39,733 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 13:04:39,734 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 13:04:39,735 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 13:04:39,747 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 13:04:39,747 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 13:04:39,748 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 13:04:39,748 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 13:04:39,750 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 13:04:39,751 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 13:04:39,751 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 13:04:39,752 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 13:04:39,753 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 13:04:39,754 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 13:04:39,755 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 13:04:39,755 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 13:04:39,756 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 13:04:39,756 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 13:04:39,759 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 13:04:39,759 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 13:04:39,801 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 13:04:39,802 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 13:04:39,804 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 13:04:39,804 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 13:04:39,804 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 13:04:39,804 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 13:04:39,805 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 13:04:39,805 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 13:04:39,805 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 13:04:39,805 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 13:04:39,806 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 13:04:39,806 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 13:04:39,807 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 13:04:39,807 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 13:04:39,807 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 13:04:39,807 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 13:04:39,808 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 13:04:39,808 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 13:04:39,808 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 13:04:39,808 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 13:04:39,808 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 13:04:39,809 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 13:04:39,809 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 13:04:39,809 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 13:04:39,809 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 13:04:39,809 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 13:04:39,810 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 13:04:39,810 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 13:04:39,810 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 13:04:39,810 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 13:04:40,115 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 13:04:40,125 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 13:04:40,129 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 13:04:40,130 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 13:04:40,131 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 13:04:40,131 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/sendmail-close-angle.i
[2020-08-18 13:04:40,203 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a09ab5bb4/195d202da8f94783b548bb2f18869efb/FLAG973705e28
[2020-08-18 13:04:40,694 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 13:04:40,697 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-invgen/sendmail-close-angle.i
[2020-08-18 13:04:40,704 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a09ab5bb4/195d202da8f94783b548bb2f18869efb/FLAG973705e28
[2020-08-18 13:04:41,041 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a09ab5bb4/195d202da8f94783b548bb2f18869efb
[2020-08-18 13:04:41,049 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 13:04:41,050 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 13:04:41,052 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 13:04:41,052 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 13:04:41,055 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 13:04:41,056 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,059 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22f0616b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41, skipping insertion in model container
[2020-08-18 13:04:41,059 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,067 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 13:04:41,089 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 13:04:41,269 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:04:41,273 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 13:04:41,292 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:04:41,307 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 13:04:41,307 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41 WrapperNode
[2020-08-18 13:04:41,308 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 13:04:41,308 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 13:04:41,309 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 13:04:41,309 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 13:04:41,323 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,323 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,329 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,330 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,409 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,419 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,420 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (1/1) ...
[2020-08-18 13:04:41,422 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 13:04:41,422 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 13:04:41,422 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 13:04:41,422 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 13:04:41,423 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (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 13:04:41,490 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 13:04:41,490 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 13:04:41,490 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 13:04:41,490 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-08-18 13:04:41,490 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 13:04:41,490 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 13:04:41,491 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 13:04:41,492 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 13:04:41,744 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 13:04:41,744 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-08-18 13:04:41,749 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:04:41 BoogieIcfgContainer
[2020-08-18 13:04:41,749 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 13:04:41,750 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 13:04:41,751 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 13:04:41,754 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 13:04:41,754 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:04:41" (1/3) ...
[2020-08-18 13:04:41,755 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75668809 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:04:41, skipping insertion in model container
[2020-08-18 13:04:41,755 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:04:41" (2/3) ...
[2020-08-18 13:04:41,755 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75668809 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:04:41, skipping insertion in model container
[2020-08-18 13:04:41,756 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:04:41" (3/3) ...
[2020-08-18 13:04:41,757 INFO  L109   eAbstractionObserver]: Analyzing ICFG sendmail-close-angle.i
[2020-08-18 13:04:41,769 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 13:04:41,776 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 13:04:41,792 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 13:04:41,817 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 13:04:41,817 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 13:04:41,817 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 13:04:41,817 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 13:04:41,818 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 13:04:41,818 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 13:04:41,818 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 13:04:41,818 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 13:04:41,844 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states.
[2020-08-18 13:04:41,851 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-08-18 13:04:41,852 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:41,853 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:41,853 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:41,859 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:41,859 INFO  L82        PathProgramCache]: Analyzing trace with hash 160437665, now seen corresponding path program 1 times
[2020-08-18 13:04:41,866 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:41,866 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033998391]
[2020-08-18 13:04:41,866 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:41,948 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:41,976 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:41,977 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:41,982 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 13:04:41,983 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033998391]
[2020-08-18 13:04:41,985 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:41,985 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2020-08-18 13:04:41,986 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124783987]
[2020-08-18 13:04:41,991 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 2 states
[2020-08-18 13:04:41,991 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,002 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2020-08-18 13:04:42,003 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-08-18 13:04:42,004 INFO  L87              Difference]: Start difference. First operand 35 states. Second operand 2 states.
[2020-08-18 13:04:42,031 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:42,031 INFO  L93              Difference]: Finished difference Result 61 states and 92 transitions.
[2020-08-18 13:04:42,031 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2020-08-18 13:04:42,032 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 14
[2020-08-18 13:04:42,033 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:42,041 INFO  L225             Difference]: With dead ends: 61
[2020-08-18 13:04:42,041 INFO  L226             Difference]: Without dead ends: 29
[2020-08-18 13:04:42,045 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-08-18 13:04:42,062 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 29 states.
[2020-08-18 13:04:42,082 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29.
[2020-08-18 13:04:42,083 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 29 states.
[2020-08-18 13:04:42,085 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions.
[2020-08-18 13:04:42,086 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 14
[2020-08-18 13:04:42,087 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:42,087 INFO  L479      AbstractCegarLoop]: Abstraction has 29 states and 37 transitions.
[2020-08-18 13:04:42,087 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2020-08-18 13:04:42,087 INFO  L276                IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions.
[2020-08-18 13:04:42,088 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2020-08-18 13:04:42,088 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:42,089 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:42,089 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 13:04:42,089 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:42,090 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:42,090 INFO  L82        PathProgramCache]: Analyzing trace with hash 89152719, now seen corresponding path program 1 times
[2020-08-18 13:04:42,090 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,090 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315031176]
[2020-08-18 13:04:42,091 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:42,119 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,213 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:42,215 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,220 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 13:04:42,220 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315031176]
[2020-08-18 13:04:42,221 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:42,221 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 13:04:42,221 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117846349]
[2020-08-18 13:04:42,223 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 13:04:42,224 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,224 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 13:04:42,225 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 13:04:42,225 INFO  L87              Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 5 states.
[2020-08-18 13:04:42,361 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:42,362 INFO  L93              Difference]: Finished difference Result 35 states and 42 transitions.
[2020-08-18 13:04:42,362 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 13:04:42,363 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 15
[2020-08-18 13:04:42,364 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:42,364 INFO  L225             Difference]: With dead ends: 35
[2020-08-18 13:04:42,365 INFO  L226             Difference]: Without dead ends: 33
[2020-08-18 13:04:42,366 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 13:04:42,367 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2020-08-18 13:04:42,376 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33.
[2020-08-18 13:04:42,376 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 33 states.
[2020-08-18 13:04:42,378 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions.
[2020-08-18 13:04:42,378 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 15
[2020-08-18 13:04:42,378 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:42,379 INFO  L479      AbstractCegarLoop]: Abstraction has 33 states and 40 transitions.
[2020-08-18 13:04:42,379 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 13:04:42,379 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions.
[2020-08-18 13:04:42,380 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-08-18 13:04:42,380 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:42,380 INFO  L422         BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:42,381 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 13:04:42,381 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:42,381 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:42,381 INFO  L82        PathProgramCache]: Analyzing trace with hash 1105875316, now seen corresponding path program 1 times
[2020-08-18 13:04:42,382 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,382 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580265498]
[2020-08-18 13:04:42,382 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:42,400 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,465 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:42,466 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,468 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 13:04:42,471 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,478 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 13:04:42,479 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580265498]
[2020-08-18 13:04:42,479 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:42,480 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-08-18 13:04:42,480 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967192617]
[2020-08-18 13:04:42,481 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-18 13:04:42,481 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,481 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-18 13:04:42,482 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2020-08-18 13:04:42,482 INFO  L87              Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 6 states.
[2020-08-18 13:04:42,626 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:42,627 INFO  L93              Difference]: Finished difference Result 48 states and 60 transitions.
[2020-08-18 13:04:42,627 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-08-18 13:04:42,628 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 20
[2020-08-18 13:04:42,628 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:42,629 INFO  L225             Difference]: With dead ends: 48
[2020-08-18 13:04:42,629 INFO  L226             Difference]: Without dead ends: 46
[2020-08-18 13:04:42,630 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2020-08-18 13:04:42,631 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 46 states.
[2020-08-18 13:04:42,641 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44.
[2020-08-18 13:04:42,642 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 44 states.
[2020-08-18 13:04:42,643 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions.
[2020-08-18 13:04:42,644 INFO  L78                 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 20
[2020-08-18 13:04:42,644 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:42,644 INFO  L479      AbstractCegarLoop]: Abstraction has 44 states and 56 transitions.
[2020-08-18 13:04:42,645 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-18 13:04:42,645 INFO  L276                IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions.
[2020-08-18 13:04:42,646 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2020-08-18 13:04:42,646 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:42,647 INFO  L422         BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:42,647 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 13:04:42,647 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:42,648 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:42,648 INFO  L82        PathProgramCache]: Analyzing trace with hash 726428669, now seen corresponding path program 1 times
[2020-08-18 13:04:42,648 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,649 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662275531]
[2020-08-18 13:04:42,649 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:42,667 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,720 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:42,721 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,723 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:42,726 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,730 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:42,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,739 INFO  L134       CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2020-08-18 13:04:42,740 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662275531]
[2020-08-18 13:04:42,740 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:42,740 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-08-18 13:04:42,741 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251558550]
[2020-08-18 13:04:42,741 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-18 13:04:42,742 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,742 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-18 13:04:42,742 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30
[2020-08-18 13:04:42,742 INFO  L87              Difference]: Start difference. First operand 44 states and 56 transitions. Second operand 6 states.
[2020-08-18 13:04:42,857 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:42,858 INFO  L93              Difference]: Finished difference Result 55 states and 67 transitions.
[2020-08-18 13:04:42,858 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-08-18 13:04:42,858 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 28
[2020-08-18 13:04:42,859 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:42,860 INFO  L225             Difference]: With dead ends: 55
[2020-08-18 13:04:42,860 INFO  L226             Difference]: Without dead ends: 53
[2020-08-18 13:04:42,861 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42
[2020-08-18 13:04:42,862 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 53 states.
[2020-08-18 13:04:42,872 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 48.
[2020-08-18 13:04:42,873 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 48 states.
[2020-08-18 13:04:42,874 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 59 transitions.
[2020-08-18 13:04:42,874 INFO  L78                 Accepts]: Start accepts. Automaton has 48 states and 59 transitions. Word has length 28
[2020-08-18 13:04:42,875 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:42,875 INFO  L479      AbstractCegarLoop]: Abstraction has 48 states and 59 transitions.
[2020-08-18 13:04:42,875 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-18 13:04:42,875 INFO  L276                IsEmpty]: Start isEmpty. Operand 48 states and 59 transitions.
[2020-08-18 13:04:42,877 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-08-18 13:04:42,877 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:42,877 INFO  L422         BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:42,877 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 13:04:42,878 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:42,878 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:42,878 INFO  L82        PathProgramCache]: Analyzing trace with hash 239914697, now seen corresponding path program 1 times
[2020-08-18 13:04:42,878 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,879 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410535084]
[2020-08-18 13:04:42,879 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:42,894 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,952 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:42,953 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,955 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 13:04:42,957 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,962 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16
[2020-08-18 13:04:42,964 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,968 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22
[2020-08-18 13:04:42,970 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:42,979 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 13:04:42,979 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410535084]
[2020-08-18 13:04:42,980 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:42,980 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2020-08-18 13:04:42,980 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20117822]
[2020-08-18 13:04:42,981 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-08-18 13:04:42,981 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:42,981 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-08-18 13:04:42,982 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42
[2020-08-18 13:04:42,982 INFO  L87              Difference]: Start difference. First operand 48 states and 59 transitions. Second operand 7 states.
[2020-08-18 13:04:43,174 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:43,174 INFO  L93              Difference]: Finished difference Result 70 states and 89 transitions.
[2020-08-18 13:04:43,175 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-08-18 13:04:43,175 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 31
[2020-08-18 13:04:43,175 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:43,177 INFO  L225             Difference]: With dead ends: 70
[2020-08-18 13:04:43,177 INFO  L226             Difference]: Without dead ends: 63
[2020-08-18 13:04:43,178 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90
[2020-08-18 13:04:43,178 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 63 states.
[2020-08-18 13:04:43,189 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61.
[2020-08-18 13:04:43,189 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 61 states.
[2020-08-18 13:04:43,191 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions.
[2020-08-18 13:04:43,191 INFO  L78                 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 31
[2020-08-18 13:04:43,192 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:43,192 INFO  L479      AbstractCegarLoop]: Abstraction has 61 states and 75 transitions.
[2020-08-18 13:04:43,192 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-08-18 13:04:43,192 INFO  L276                IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions.
[2020-08-18 13:04:43,193 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 34
[2020-08-18 13:04:43,193 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:43,193 INFO  L422         BasicCegarLoop]: trace histogram [4, 3, 3, 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 13:04:43,194 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 13:04:43,194 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:43,194 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:43,194 INFO  L82        PathProgramCache]: Analyzing trace with hash 1617190790, now seen corresponding path program 1 times
[2020-08-18 13:04:43,195 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:43,195 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263037453]
[2020-08-18 13:04:43,195 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:43,208 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,271 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:43,271 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,273 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:43,275 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,278 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:43,280 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,283 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:43,285 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,290 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 13:04:43,291 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263037453]
[2020-08-18 13:04:43,291 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:04:43,291 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8
[2020-08-18 13:04:43,292 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639660386]
[2020-08-18 13:04:43,292 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-08-18 13:04:43,292 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:43,293 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-08-18 13:04:43,293 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56
[2020-08-18 13:04:43,293 INFO  L87              Difference]: Start difference. First operand 61 states and 75 transitions. Second operand 8 states.
[2020-08-18 13:04:43,479 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:43,479 INFO  L93              Difference]: Finished difference Result 72 states and 86 transitions.
[2020-08-18 13:04:43,480 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-08-18 13:04:43,480 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 33
[2020-08-18 13:04:43,481 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:43,482 INFO  L225             Difference]: With dead ends: 72
[2020-08-18 13:04:43,482 INFO  L226             Difference]: Without dead ends: 70
[2020-08-18 13:04:43,483 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132
[2020-08-18 13:04:43,483 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 70 states.
[2020-08-18 13:04:43,493 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65.
[2020-08-18 13:04:43,493 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 65 states.
[2020-08-18 13:04:43,494 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions.
[2020-08-18 13:04:43,495 INFO  L78                 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 33
[2020-08-18 13:04:43,495 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:43,495 INFO  L479      AbstractCegarLoop]: Abstraction has 65 states and 78 transitions.
[2020-08-18 13:04:43,495 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-08-18 13:04:43,496 INFO  L276                IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions.
[2020-08-18 13:04:43,497 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 57
[2020-08-18 13:04:43,498 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:43,498 INFO  L422         BasicCegarLoop]: trace histogram [8, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 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 13:04:43,498 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 13:04:43,498 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:43,499 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:43,499 INFO  L82        PathProgramCache]: Analyzing trace with hash 260855770, now seen corresponding path program 1 times
[2020-08-18 13:04:43,499 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:43,500 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814664725]
[2020-08-18 13:04:43,500 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:43,519 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,622 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:43,623 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,624 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:43,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,629 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:43,631 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,634 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:43,635 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,638 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 13:04:43,640 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,643 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36
[2020-08-18 13:04:43,645 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,648 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 13:04:43,650 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,652 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47
[2020-08-18 13:04:43,654 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:43,664 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2020-08-18 13:04:43,665 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814664725]
[2020-08-18 13:04:43,665 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 13:04:43,665 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-18 13:04:43,666 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298531328]
[2020-08-18 13:04:43,666 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-18 13:04:43,667 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:43,667 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-18 13:04:43,667 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2020-08-18 13:04:43,667 INFO  L87              Difference]: Start difference. First operand 65 states and 78 transitions. Second operand 9 states.
[2020-08-18 13:04:44,025 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:44,025 INFO  L93              Difference]: Finished difference Result 96 states and 123 transitions.
[2020-08-18 13:04:44,026 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 13:04:44,026 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 56
[2020-08-18 13:04:44,027 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:44,029 INFO  L225             Difference]: With dead ends: 96
[2020-08-18 13:04:44,029 INFO  L226             Difference]: Without dead ends: 86
[2020-08-18 13:04:44,030 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240
[2020-08-18 13:04:44,031 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 86 states.
[2020-08-18 13:04:44,043 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 78.
[2020-08-18 13:04:44,043 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 78 states.
[2020-08-18 13:04:44,044 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions.
[2020-08-18 13:04:44,045 INFO  L78                 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 56
[2020-08-18 13:04:44,045 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:44,045 INFO  L479      AbstractCegarLoop]: Abstraction has 78 states and 94 transitions.
[2020-08-18 13:04:44,045 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-18 13:04:44,046 INFO  L276                IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions.
[2020-08-18 13:04:44,047 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 59
[2020-08-18 13:04:44,047 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:44,047 INFO  L422         BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:44,047 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-08-18 13:04:44,048 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:44,048 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:44,048 INFO  L82        PathProgramCache]: Analyzing trace with hash 266725463, now seen corresponding path program 1 times
[2020-08-18 13:04:44,048 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:44,049 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442055929]
[2020-08-18 13:04:44,049 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:44,063 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,141 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:44,142 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,144 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:44,145 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,152 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:44,154 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,159 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:44,160 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,166 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 13:04:44,169 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,172 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 13:04:44,175 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,178 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42
[2020-08-18 13:04:44,183 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,196 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 13:04:44,198 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,206 INFO  L134       CoverageAnalysis]: Checked inductivity of 107 backedges. 14 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2020-08-18 13:04:44,207 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442055929]
[2020-08-18 13:04:44,207 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 13:04:44,207 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-18 13:04:44,207 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977128187]
[2020-08-18 13:04:44,209 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-18 13:04:44,209 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:44,210 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-18 13:04:44,211 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2020-08-18 13:04:44,211 INFO  L87              Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 9 states.
[2020-08-18 13:04:44,410 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:44,411 INFO  L93              Difference]: Finished difference Result 89 states and 105 transitions.
[2020-08-18 13:04:44,411 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 13:04:44,411 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 58
[2020-08-18 13:04:44,412 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:44,413 INFO  L225             Difference]: With dead ends: 89
[2020-08-18 13:04:44,413 INFO  L226             Difference]: Without dead ends: 87
[2020-08-18 13:04:44,414 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182
[2020-08-18 13:04:44,414 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 87 states.
[2020-08-18 13:04:44,424 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 82.
[2020-08-18 13:04:44,425 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 82 states.
[2020-08-18 13:04:44,426 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions.
[2020-08-18 13:04:44,426 INFO  L78                 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 58
[2020-08-18 13:04:44,427 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:44,427 INFO  L479      AbstractCegarLoop]: Abstraction has 82 states and 97 transitions.
[2020-08-18 13:04:44,427 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-18 13:04:44,427 INFO  L276                IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions.
[2020-08-18 13:04:44,428 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 82
[2020-08-18 13:04:44,429 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:44,429 INFO  L422         BasicCegarLoop]: trace histogram [12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:44,429 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-08-18 13:04:44,429 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:44,430 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:44,430 INFO  L82        PathProgramCache]: Analyzing trace with hash 269972457, now seen corresponding path program 2 times
[2020-08-18 13:04:44,430 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:44,431 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538530445]
[2020-08-18 13:04:44,431 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:44,451 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,592 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:44,593 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,594 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:44,597 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,602 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:44,604 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,609 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:44,611 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,616 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 13:04:44,618 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,627 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 13:04:44,629 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,633 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42
[2020-08-18 13:04:44,637 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,639 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 13:04:44,642 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,645 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54
[2020-08-18 13:04:44,646 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,650 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 13:04:44,657 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,660 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66
[2020-08-18 13:04:44,662 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,667 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72
[2020-08-18 13:04:44,671 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:44,689 INFO  L134       CoverageAnalysis]: Checked inductivity of 255 backedges. 22 proven. 10 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked.
[2020-08-18 13:04:44,689 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538530445]
[2020-08-18 13:04:44,690 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 13:04:44,690 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-08-18 13:04:44,694 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332035733]
[2020-08-18 13:04:44,695 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-08-18 13:04:44,696 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:44,697 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-08-18 13:04:44,698 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90
[2020-08-18 13:04:44,698 INFO  L87              Difference]: Start difference. First operand 82 states and 97 transitions. Second operand 10 states.
[2020-08-18 13:04:44,863 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:44,864 INFO  L93              Difference]: Finished difference Result 88 states and 102 transitions.
[2020-08-18 13:04:44,864 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-08-18 13:04:44,865 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 81
[2020-08-18 13:04:44,865 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:44,868 INFO  L225             Difference]: With dead ends: 88
[2020-08-18 13:04:44,868 INFO  L226             Difference]: Without dead ends: 79
[2020-08-18 13:04:44,869 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182
[2020-08-18 13:04:44,870 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 79 states.
[2020-08-18 13:04:44,877 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70.
[2020-08-18 13:04:44,877 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 70 states.
[2020-08-18 13:04:44,878 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 74 transitions.
[2020-08-18 13:04:44,879 INFO  L78                 Accepts]: Start accepts. Automaton has 70 states and 74 transitions. Word has length 81
[2020-08-18 13:04:44,879 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:44,879 INFO  L479      AbstractCegarLoop]: Abstraction has 70 states and 74 transitions.
[2020-08-18 13:04:44,879 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-08-18 13:04:44,880 INFO  L276                IsEmpty]: Start isEmpty. Operand 70 states and 74 transitions.
[2020-08-18 13:04:44,881 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 84
[2020-08-18 13:04:44,881 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:44,881 INFO  L422         BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:44,881 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8
[2020-08-18 13:04:44,882 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:44,882 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:44,882 INFO  L82        PathProgramCache]: Analyzing trace with hash 437927078, now seen corresponding path program 2 times
[2020-08-18 13:04:44,882 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:44,883 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760028385]
[2020-08-18 13:04:44,883 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:44,900 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,018 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:45,018 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,020 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:45,021 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,025 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:45,026 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,034 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:45,036 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,038 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 13:04:45,039 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,041 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 13:04:45,043 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,044 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42
[2020-08-18 13:04:45,046 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,047 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 13:04:45,048 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,050 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54
[2020-08-18 13:04:45,051 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,053 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62
[2020-08-18 13:04:45,054 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,056 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 13:04:45,058 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,060 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74
[2020-08-18 13:04:45,062 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,072 INFO  L134       CoverageAnalysis]: Checked inductivity of 269 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked.
[2020-08-18 13:04:45,073 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760028385]
[2020-08-18 13:04:45,073 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 13:04:45,073 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-08-18 13:04:45,074 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124052741]
[2020-08-18 13:04:45,074 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-18 13:04:45,074 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:45,075 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-18 13:04:45,075 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110
[2020-08-18 13:04:45,075 INFO  L87              Difference]: Start difference. First operand 70 states and 74 transitions. Second operand 11 states.
[2020-08-18 13:04:45,356 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:45,357 INFO  L93              Difference]: Finished difference Result 92 states and 101 transitions.
[2020-08-18 13:04:45,357 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-08-18 13:04:45,357 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 83
[2020-08-18 13:04:45,358 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:45,359 INFO  L225             Difference]: With dead ends: 92
[2020-08-18 13:04:45,359 INFO  L226             Difference]: Without dead ends: 90
[2020-08-18 13:04:45,363 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306
[2020-08-18 13:04:45,363 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 90 states.
[2020-08-18 13:04:45,382 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83.
[2020-08-18 13:04:45,382 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 83 states.
[2020-08-18 13:04:45,383 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 90 transitions.
[2020-08-18 13:04:45,384 INFO  L78                 Accepts]: Start accepts. Automaton has 83 states and 90 transitions. Word has length 83
[2020-08-18 13:04:45,384 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:45,384 INFO  L479      AbstractCegarLoop]: Abstraction has 83 states and 90 transitions.
[2020-08-18 13:04:45,384 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-18 13:04:45,385 INFO  L276                IsEmpty]: Start isEmpty. Operand 83 states and 90 transitions.
[2020-08-18 13:04:45,386 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 109
[2020-08-18 13:04:45,386 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:04:45,386 INFO  L422         BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 13:04:45,386 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9
[2020-08-18 13:04:45,387 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:04:45,387 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:04:45,387 INFO  L82        PathProgramCache]: Analyzing trace with hash 331157303, now seen corresponding path program 3 times
[2020-08-18 13:04:45,387 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:04:45,387 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785920136]
[2020-08-18 13:04:45,393 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:04:45,439 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,653 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:04:45,654 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,655 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-08-18 13:04:45,656 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,658 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 13:04:45,660 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,662 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24
[2020-08-18 13:04:45,664 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,666 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 13:04:45,668 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,670 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 13:04:45,671 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,673 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42
[2020-08-18 13:04:45,674 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,676 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 13:04:45,677 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,679 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54
[2020-08-18 13:04:45,680 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,682 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62
[2020-08-18 13:04:45,683 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,685 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 13:04:45,686 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,688 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74
[2020-08-18 13:04:45,689 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,690 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 13:04:45,691 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,693 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 13:04:45,694 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,695 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92
[2020-08-18 13:04:45,696 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,698 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 13:04:45,699 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:04:45,718 INFO  L134       CoverageAnalysis]: Checked inductivity of 504 backedges. 30 proven. 51 refuted. 0 times theorem prover too weak. 423 trivial. 0 not checked.
[2020-08-18 13:04:45,719 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785920136]
[2020-08-18 13:04:45,719 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 13:04:45,719 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-08-18 13:04:45,719 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663427092]
[2020-08-18 13:04:45,720 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 13:04:45,720 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:04:45,720 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 13:04:45,721 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156
[2020-08-18 13:04:45,721 INFO  L87              Difference]: Start difference. First operand 83 states and 90 transitions. Second operand 13 states.
[2020-08-18 13:04:45,876 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:04:45,876 INFO  L93              Difference]: Finished difference Result 83 states and 90 transitions.
[2020-08-18 13:04:45,877 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 13:04:45,877 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 108
[2020-08-18 13:04:45,878 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:04:45,878 INFO  L225             Difference]: With dead ends: 83
[2020-08-18 13:04:45,878 INFO  L226             Difference]: Without dead ends: 0
[2020-08-18 13:04:45,881 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272
[2020-08-18 13:04:45,882 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 0 states.
[2020-08-18 13:04:45,882 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0.
[2020-08-18 13:04:45,882 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 0 states.
[2020-08-18 13:04:45,882 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions.
[2020-08-18 13:04:45,882 INFO  L78                 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 108
[2020-08-18 13:04:45,883 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:04:45,884 INFO  L479      AbstractCegarLoop]: Abstraction has 0 states and 0 transitions.
[2020-08-18 13:04:45,884 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 13:04:45,884 INFO  L276                IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions.
[2020-08-18 13:04:45,884 INFO  L282                IsEmpty]: Finished isEmpty. No accepting run.
[2020-08-18 13:04:45,884 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10
[2020-08-18 13:04:45,887 INFO  L343    DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.
[2020-08-18 13:04:46,380 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.initFINAL(line -1)  the Hoare annotation is:  true
[2020-08-18 13:04:46,380 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.initEXIT(line -1)  no Hoare annotation was computed.
[2020-08-18 13:04:46,380 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startEXIT(line -1)  no Hoare annotation was computed.
[2020-08-18 13:04:46,381 INFO  L271        CegarLoopResult]: At program point  L-1(line -1)  the Hoare annotation is:  true
[2020-08-18 13:04:46,383 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.startENTRY(line -1)  the Hoare annotation is:  true
[2020-08-18 13:04:46,383 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startFINAL(line -1)  no Hoare annotation was computed.
[2020-08-18 13:04:46,383 INFO  L268        CegarLoopResult]: For program point  assume_abort_if_notENTRY(lines 3 5)  no Hoare annotation was computed.
[2020-08-18 13:04:46,384 INFO  L268        CegarLoopResult]: For program point  L4(line 4)  no Hoare annotation was computed.
[2020-08-18 13:04:46,384 INFO  L268        CegarLoopResult]: For program point  L4-2(lines 3 5)  no Hoare annotation was computed.
[2020-08-18 13:04:46,384 INFO  L268        CegarLoopResult]: For program point  assume_abort_if_notEXIT(lines 3 5)  no Hoare annotation was computed.
[2020-08-18 13:04:46,384 INFO  L268        CegarLoopResult]: For program point  L31(line 31)  no Hoare annotation was computed.
[2020-08-18 13:04:46,384 INFO  L268        CegarLoopResult]: For program point  mainEXIT(lines 13 45)  no Hoare annotation was computed.
[2020-08-18 13:04:46,385 INFO  L271        CegarLoopResult]: At program point  L44(lines 14 45)  the Hoare annotation is:  true
[2020-08-18 13:04:46,385 INFO  L264        CegarLoopResult]: At program point  L36(lines 26 37)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (< main_~buf~0 (+ main_~buflim~0 1)) (<= (+ main_~buflim~0 2) main_~bufferlen~0) (<= (+ main_~in~0 main_~buflim~0 3) (+ main_~buf~0 main_~inlen~0)) (<= (+ main_~bufferlen~0 1) main_~inlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,386 INFO  L268        CegarLoopResult]: For program point  L28(lines 28 29)  no Hoare annotation was computed.
[2020-08-18 13:04:46,386 INFO  L268        CegarLoopResult]: For program point  L20(line 20)  no Hoare annotation was computed.
[2020-08-18 13:04:46,386 INFO  L268        CegarLoopResult]: For program point  L20-1(lines 14 45)  no Hoare annotation was computed.
[2020-08-18 13:04:46,386 INFO  L264        CegarLoopResult]: At program point  L41(line 41)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buf~0 1) main_~bufferlen~0) (<= 2 main_~bufferlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,387 INFO  L264        CegarLoopResult]: At program point  L41-1(line 41)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buf~0 1) main_~bufferlen~0) (<= 2 main_~bufferlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,387 INFO  L268        CegarLoopResult]: For program point  L33(lines 33 34)  no Hoare annotation was computed.
[2020-08-18 13:04:46,387 INFO  L268        CegarLoopResult]: For program point  L21(lines 14 45)  no Hoare annotation was computed.
[2020-08-18 13:04:46,387 INFO  L268        CegarLoopResult]: For program point  mainFINAL(lines 13 45)  no Hoare annotation was computed.
[2020-08-18 13:04:46,388 INFO  L268        CegarLoopResult]: For program point  L42(line 42)  no Hoare annotation was computed.
[2020-08-18 13:04:46,388 INFO  L264        CegarLoopResult]: At program point  L38(line 38)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buf~0 2) main_~bufferlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,389 INFO  L264        CegarLoopResult]: At program point  L30(line 30)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buflim~0 2) main_~bufferlen~0) (< main_~buf~0 main_~buflim~0) (<= (+ main_~in~0 main_~buflim~0 3) (+ main_~buf~0 main_~inlen~0)) (<= (+ main_~bufferlen~0 1) main_~inlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,389 INFO  L271        CegarLoopResult]: At program point  mainENTRY(lines 13 45)  the Hoare annotation is:  true
[2020-08-18 13:04:46,390 INFO  L264        CegarLoopResult]: At program point  L30-1(line 30)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buflim~0 2) main_~bufferlen~0) (< main_~buf~0 main_~buflim~0) (<= (+ main_~in~0 main_~buflim~0 3) (+ main_~buf~0 main_~inlen~0)) (<= (+ main_~bufferlen~0 1) main_~inlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,390 INFO  L268        CegarLoopResult]: For program point  L26-1(lines 26 37)  no Hoare annotation was computed.
[2020-08-18 13:04:46,391 INFO  L264        CegarLoopResult]: At program point  L26-3(lines 26 37)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (<= (+ main_~buf~0 2) main_~bufferlen~0) (<= 0 main_~in~0))
[2020-08-18 13:04:46,391 INFO  L268        CegarLoopResult]: For program point  L22(line 22)  no Hoare annotation was computed.
[2020-08-18 13:04:46,391 INFO  L268        CegarLoopResult]: For program point  L39(line 39)  no Hoare annotation was computed.
[2020-08-18 13:04:46,391 INFO  L264        CegarLoopResult]: At program point  L35(line 35)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (< main_~buf~0 (+ main_~buflim~0 1)) (<= (+ main_~buflim~0 2) main_~bufferlen~0) (<= 1 main_~in~0) (<= (+ main_~in~0 main_~buflim~0 3) (+ main_~buf~0 main_~inlen~0)) (<= (+ main_~bufferlen~0 1) main_~inlen~0))
[2020-08-18 13:04:46,392 INFO  L264        CegarLoopResult]: At program point  L35-1(line 35)  the Hoare annotation is:  (and (<= 0 main_~buf~0) (< main_~buf~0 (+ main_~buflim~0 1)) (<= (+ main_~buflim~0 2) main_~bufferlen~0) (<= 1 main_~in~0) (<= (+ main_~in~0 main_~buflim~0 3) (+ main_~buf~0 main_~inlen~0)) (<= (+ main_~bufferlen~0 1) main_~inlen~0))
[2020-08-18 13:04:46,392 INFO  L271        CegarLoopResult]: At program point  __VERIFIER_assertENTRY(lines 6 11)  the Hoare annotation is:  true
[2020-08-18 13:04:46,392 INFO  L268        CegarLoopResult]: For program point  __VERIFIER_assertEXIT(lines 6 11)  no Hoare annotation was computed.
[2020-08-18 13:04:46,392 INFO  L268        CegarLoopResult]: For program point  L8(line 8)  no Hoare annotation was computed.
[2020-08-18 13:04:46,392 INFO  L268        CegarLoopResult]: For program point  L7(lines 7 9)  no Hoare annotation was computed.
[2020-08-18 13:04:46,393 INFO  L268        CegarLoopResult]: For program point  L7-2(lines 6 11)  no Hoare annotation was computed.
[2020-08-18 13:04:46,393 INFO  L268        CegarLoopResult]: For program point  __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8)  no Hoare annotation was computed.
[2020-08-18 13:04:46,423 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 01:04:46 BoogieIcfgContainer
[2020-08-18 13:04:46,424 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-18 13:04:46,427 INFO  L168              Benchmark]: Toolchain (without parser) took 5375.59 ms. Allocated memory was 140.5 MB in the beginning and 283.6 MB in the end (delta: 143.1 MB). Free memory was 102.6 MB in the beginning and 132.4 MB in the end (delta: -29.8 MB). Peak memory consumption was 113.3 MB. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,428 INFO  L168              Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,432 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 256.08 ms. Allocated memory is still 140.5 MB. Free memory was 102.4 MB in the beginning and 92.1 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,436 INFO  L168              Benchmark]: Boogie Preprocessor took 113.40 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 182.1 MB in the end (delta: -90.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,437 INFO  L168              Benchmark]: RCFGBuilder took 327.06 ms. Allocated memory is still 202.9 MB. Free memory was 182.1 MB in the beginning and 166.7 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,439 INFO  L168              Benchmark]: TraceAbstraction took 4673.27 ms. Allocated memory was 202.9 MB in the beginning and 283.6 MB in the end (delta: 80.7 MB). Free memory was 166.0 MB in the beginning and 132.4 MB in the end (delta: 33.7 MB). Peak memory consumption was 114.4 MB. Max. memory is 7.1 GB.
[2020-08-18 13:04:46,448 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.12 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 256.08 ms. Allocated memory is still 140.5 MB. Free memory was 102.4 MB in the beginning and 92.1 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 113.40 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 182.1 MB in the end (delta: -90.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 327.06 ms. Allocated memory is still 202.9 MB. Free memory was 182.1 MB in the beginning and 166.7 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 4673.27 ms. Allocated memory was 202.9 MB in the beginning and 283.6 MB in the end (delta: 80.7 MB). Free memory was 166.0 MB in the beginning and 132.4 MB in the end (delta: 33.7 MB). Peak memory consumption was 114.4 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable
    For all program executions holds that call of __VERIFIER_error() unreachable at this location
  - AllSpecificationsHoldResult: All specifications hold
    1 specifications checked. All of them hold
  - InvariantResult [Line: 14]: Loop Invariant
    Derived loop invariant: 1
  - InvariantResult [Line: 26]: Loop Invariant
    Derived loop invariant: ((((0 <= buf && buf < buflim + 1) && buflim + 2 <= bufferlen) && in + buflim + 3 <= buf + inlen) && bufferlen + 1 <= inlen) && 0 <= in
  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.0s, OverallIterations: 11, TraceHistogramMax: 16, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 422 SDtfs, 351 SDslu, 1324 SDs, 0 SdLazy, 750 SolverSat, 329 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 268 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=83occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 43 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 15 LocationsWithAnnotation, 54 PreInvPairs, 91 NumberOfFragments, 206 HoareAnnotationTreeSize, 54 FomulaSimplifications, 1422 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 15 FomulaSimplificationsInter, 705 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 527 NumberOfCodeBlocks, 527 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 516 ConstructedInterpolants, 0 QuantifiedInterpolants, 111624 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 11 InterpolantComputations, 6 PerfectInterpolantSequences, 1182/1281 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be correct!
Received shutdown request...