/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 --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i


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


This is Ultimate 0.1.25-c90d42b
[2020-09-24 17:20:28,445 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-24 17:20:28,450 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-24 17:20:28,494 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-24 17:20:28,496 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-24 17:20:28,504 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-24 17:20:28,506 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-09-24 17:20:28,510 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-09-24 17:20:28,513 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-09-24 17:20:28,516 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-09-24 17:20:28,517 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-09-24 17:20:28,518 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-24 17:20:28,518 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-24 17:20:28,522 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-24 17:20:28,523 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-24 17:20:28,526 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-24 17:20:28,527 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-24 17:20:28,528 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-24 17:20:28,529 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-24 17:20:28,531 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-24 17:20:28,533 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-24 17:20:28,533 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-24 17:20:28,535 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-24 17:20:28,535 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-24 17:20:28,538 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-24 17:20:28,538 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-24 17:20:28,538 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-24 17:20:28,539 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-09-24 17:20:28,539 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-09-24 17:20:28,540 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-09-24 17:20:28,541 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-09-24 17:20:28,541 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-09-24 17:20:28,542 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-09-24 17:20:28,543 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-09-24 17:20:28,544 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-24 17:20:28,544 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-09-24 17:20:28,545 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-09-24 17:20:28,545 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-09-24 17:20:28,545 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-09-24 17:20:28,547 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-24 17:20:28,548 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
[2020-09-24 17:20:28,571 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-24 17:20:28,572 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-24 17:20:28,573 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-24 17:20:28,573 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-24 17:20:28,574 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-24 17:20:28,574 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-24 17:20:28,574 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-24 17:20:28,574 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-24 17:20:28,575 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-24 17:20:28,575 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-24 17:20:28,575 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-24 17:20:28,575 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-24 17:20:28,575 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-24 17:20:28,576 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-24 17:20:28,576 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-24 17:20:28,576 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-24 17:20:28,576 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-24 17:20:28,576 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-24 17:20:28,577 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-24 17:20:28,577 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-24 17:20:28,577 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-24 17:20:28,577 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-24 17:20:28,578 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-24 17:20:28,578 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-24 17:20:28,578 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-24 17:20:28,578 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-24 17:20:28,579 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-24 17:20:28,579 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-24 17:20:28,579 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-24 17:20:28,579 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.rcfgbuilder: Size of a code block -> SingleStatement
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 -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;log-additional-information=true;
[2020-09-24 17:20:29,049 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-24 17:20:29,072 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-24 17:20:29,076 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-24 17:20:29,078 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-24 17:20:29,080 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-24 17:20:29,081 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i
[2020-09-24 17:20:29,173 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b24821884/83b458a2821549d384a918019ff3480a/FLAG6660d57c3
[2020-09-24 17:20:29,740 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-24 17:20:29,741 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum01-1.i
[2020-09-24 17:20:29,750 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b24821884/83b458a2821549d384a918019ff3480a/FLAG6660d57c3
[2020-09-24 17:20:30,079 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b24821884/83b458a2821549d384a918019ff3480a
[2020-09-24 17:20:30,094 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-24 17:20:30,102 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-24 17:20:30,103 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-24 17:20:30,103 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-24 17:20:30,108 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-24 17:20:30,109 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,114 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@156ed3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30, skipping insertion in model container
[2020-09-24 17:20:30,114 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,123 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-24 17:20:30,149 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-24 17:20:30,370 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 17:20:30,376 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-24 17:20:30,396 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 17:20:30,414 INFO  L208         MainTranslator]: Completed translation
[2020-09-24 17:20:30,415 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30 WrapperNode
[2020-09-24 17:20:30,415 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-24 17:20:30,416 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-24 17:20:30,416 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-24 17:20:30,417 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-24 17:20:30,436 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,436 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,443 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,444 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,449 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,455 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,457 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (1/1) ...
[2020-09-24 17:20:30,539 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-24 17:20:30,540 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-24 17:20:30,540 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-24 17:20:30,540 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-24 17:20:30,542 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (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
[2020-09-24 17:20:30,627 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-24 17:20:30,627 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-24 17:20:30,628 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-09-24 17:20:30,628 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-24 17:20:30,628 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-24 17:20:30,629 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-09-24 17:20:30,629 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint
[2020-09-24 17:20:30,629 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-24 17:20:30,629 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-24 17:20:30,630 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-24 17:20:30,830 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-24 17:20:30,830 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-09-24 17:20:30,836 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:20:30 BoogieIcfgContainer
[2020-09-24 17:20:30,836 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-24 17:20:30,838 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-24 17:20:30,838 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-24 17:20:30,842 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-24 17:20:30,842 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 05:20:30" (1/3) ...
[2020-09-24 17:20:30,843 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f1cfc55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:20:30, skipping insertion in model container
[2020-09-24 17:20:30,843 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 05:20:30" (2/3) ...
[2020-09-24 17:20:30,844 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f1cfc55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 05:20:30, skipping insertion in model container
[2020-09-24 17:20:30,844 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 05:20:30" (3/3) ...
[2020-09-24 17:20:30,847 INFO  L109   eAbstractionObserver]: Analyzing ICFG sum01-1.i
[2020-09-24 17:20:30,868 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-24 17:20:30,882 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-24 17:20:30,909 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-24 17:20:30,950 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-24 17:20:30,950 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-24 17:20:30,950 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-24 17:20:30,950 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-24 17:20:30,952 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-24 17:20:30,952 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-24 17:20:30,952 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-24 17:20:30,953 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-24 17:20:30,991 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states.
[2020-09-24 17:20:31,000 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-09-24 17:20:31,001 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:31,002 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:31,002 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:31,011 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:31,011 INFO  L82        PathProgramCache]: Analyzing trace with hash 1882057920, now seen corresponding path program 1 times
[2020-09-24 17:20:31,020 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:31,021 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124013442]
[2020-09-24 17:20:31,021 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:31,124 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:31,146 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:31,212 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:31,323 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:31,323 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 23
[2020-09-24 17:20:31,323 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-09-24 17:20:31,323 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 193
[2020-09-24 17:20:31,325 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:31,325 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:31,326 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 16
[2020-09-24 17:20:31,326 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:31,326 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 2
[2020-09-24 17:20:31,367 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:31,369 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:31,371 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:31,375 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:31,375 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:31,376 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:31,376 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 5
[2020-09-24 17:20:31,376 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:31,376 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:31,377 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:31,377 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:31,377 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:20:31,393 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:31,396 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124013442]
[2020-09-24 17:20:31,399 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 17:20:31,400 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2020-09-24 17:20:31,402 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147211756]
[2020-09-24 17:20:31,409 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 2 states
[2020-09-24 17:20:31,410 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:31,425 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2020-09-24 17:20:31,426 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-09-24 17:20:31,428 INFO  L87              Difference]: Start difference. First operand 26 states. Second operand 2 states.
[2020-09-24 17:20:31,455 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:31,456 INFO  L93              Difference]: Finished difference Result 37 states and 41 transitions.
[2020-09-24 17:20:31,456 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2020-09-24 17:20:31,457 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 14
[2020-09-24 17:20:31,458 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:31,468 INFO  L225             Difference]: With dead ends: 37
[2020-09-24 17:20:31,469 INFO  L226             Difference]: Without dead ends: 20
[2020-09-24 17:20:31,478 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
[2020-09-24 17:20:31,500 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20 states.
[2020-09-24 17:20:31,522 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20.
[2020-09-24 17:20:31,524 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 20 states.
[2020-09-24 17:20:31,525 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions.
[2020-09-24 17:20:31,527 INFO  L78                 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14
[2020-09-24 17:20:31,527 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:31,527 INFO  L479      AbstractCegarLoop]: Abstraction has 20 states and 21 transitions.
[2020-09-24 17:20:31,527 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2020-09-24 17:20:31,528 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions.
[2020-09-24 17:20:31,528 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-09-24 17:20:31,528 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:31,529 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:31,529 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-24 17:20:31,529 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:31,530 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:31,530 INFO  L82        PathProgramCache]: Analyzing trace with hash 1869128626, now seen corresponding path program 1 times
[2020-09-24 17:20:31,530 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:31,530 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271611459]
[2020-09-24 17:20:31,531 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:31,544 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:31,555 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:31,666 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:31,667 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 23
[2020-09-24 17:20:31,667 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:31,667 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 121
[2020-09-24 17:20:31,668 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:31,668 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-24 17:20:31,668 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 14
[2020-09-24 17:20:31,668 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 8
[2020-09-24 17:20:31,669 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:20:31,740 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:31,741 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:31,743 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:31,745 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:31,745 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:31,745 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:31,746 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:31,746 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:31,746 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:31,747 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:31,747 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:31,747 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:20:31,750 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:31,751 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271611459]
[2020-09-24 17:20:31,751 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 17:20:31,752 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-09-24 17:20:31,752 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877585669]
[2020-09-24 17:20:31,754 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-24 17:20:31,754 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:31,755 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-24 17:20:31,755 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-09-24 17:20:31,755 INFO  L87              Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states.
[2020-09-24 17:20:31,802 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:31,802 INFO  L93              Difference]: Finished difference Result 31 states and 33 transitions.
[2020-09-24 17:20:31,803 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-09-24 17:20:31,803 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 14
[2020-09-24 17:20:31,804 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:31,805 INFO  L225             Difference]: With dead ends: 31
[2020-09-24 17:20:31,805 INFO  L226             Difference]: Without dead ends: 26
[2020-09-24 17:20:31,807 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
[2020-09-24 17:20:31,808 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 26 states.
[2020-09-24 17:20:31,813 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25.
[2020-09-24 17:20:31,813 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 25 states.
[2020-09-24 17:20:31,814 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions.
[2020-09-24 17:20:31,814 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 14
[2020-09-24 17:20:31,815 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:31,815 INFO  L479      AbstractCegarLoop]: Abstraction has 25 states and 27 transitions.
[2020-09-24 17:20:31,815 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-24 17:20:31,815 INFO  L276                IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions.
[2020-09-24 17:20:31,816 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-09-24 17:20:31,816 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:31,817 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:31,817 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-24 17:20:31,817 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:31,817 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:31,818 INFO  L82        PathProgramCache]: Analyzing trace with hash 1535432394, now seen corresponding path program 1 times
[2020-09-24 17:20:31,818 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:31,818 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297207477]
[2020-09-24 17:20:31,819 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:31,832 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:31,844 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:32,116 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:32,116 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 29
[2020-09-24 17:20:32,117 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:32,117 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 283
[2020-09-24 17:20:32,117 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:32,117 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 10
[2020-09-24 17:20:32,118 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 14
[2020-09-24 17:20:32,118 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 14
[2020-09-24 17:20:32,118 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:32,510 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:32,511 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:32,513 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:32,515 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:32,515 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:32,515 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:32,516 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:32,516 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:32,516 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:32,517 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:32,517 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:32,517 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:32,522 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:32,522 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297207477]
[2020-09-24 17:20:32,523 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:32,523 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-09-24 17:20:32,523 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098547147]
[2020-09-24 17:20:32,524 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-09-24 17:20:32,524 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:32,524 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-09-24 17:20:32,525 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110
[2020-09-24 17:20:32,525 INFO  L87              Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states.
[2020-09-24 17:20:32,731 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:32,731 INFO  L93              Difference]: Finished difference Result 48 states and 53 transitions.
[2020-09-24 17:20:32,732 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-09-24 17:20:32,732 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 20
[2020-09-24 17:20:32,732 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:32,733 INFO  L225             Difference]: With dead ends: 48
[2020-09-24 17:20:32,733 INFO  L226             Difference]: Without dead ends: 29
[2020-09-24 17:20:32,734 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210
[2020-09-24 17:20:32,735 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 29 states.
[2020-09-24 17:20:32,739 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27.
[2020-09-24 17:20:32,740 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 27 states.
[2020-09-24 17:20:32,741 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions.
[2020-09-24 17:20:32,741 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20
[2020-09-24 17:20:32,741 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:32,742 INFO  L479      AbstractCegarLoop]: Abstraction has 27 states and 28 transitions.
[2020-09-24 17:20:32,742 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-09-24 17:20:32,742 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions.
[2020-09-24 17:20:32,743 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-09-24 17:20:32,743 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:32,743 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:32,743 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-09-24 17:20:32,743 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:32,744 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:32,744 INFO  L82        PathProgramCache]: Analyzing trace with hash -927596731, now seen corresponding path program 1 times
[2020-09-24 17:20:32,744 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:32,745 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763579456]
[2020-09-24 17:20:32,745 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:32,755 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:32,763 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:32,831 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:32,831 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 34
[2020-09-24 17:20:32,831 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:32,832 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 75
[2020-09-24 17:20:32,832 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:32,832 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-09-24 17:20:32,832 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:32,832 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 9
[2020-09-24 17:20:32,833 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:32,867 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:32,868 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:32,869 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:32,870 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:32,871 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:32,871 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:32,871 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:32,871 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:32,872 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:32,872 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:32,872 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:32,872 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:32,875 INFO  L134       CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:32,876 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763579456]
[2020-09-24 17:20:32,876 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:32,876 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5
[2020-09-24 17:20:32,876 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354137057]
[2020-09-24 17:20:32,877 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-09-24 17:20:32,877 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:32,878 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-09-24 17:20:32,878 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20
[2020-09-24 17:20:32,878 INFO  L87              Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 5 states.
[2020-09-24 17:20:32,932 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:32,932 INFO  L93              Difference]: Finished difference Result 42 states and 45 transitions.
[2020-09-24 17:20:32,933 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-24 17:20:32,933 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 25
[2020-09-24 17:20:32,934 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:32,934 INFO  L225             Difference]: With dead ends: 42
[2020-09-24 17:20:32,935 INFO  L226             Difference]: Without dead ends: 31
[2020-09-24 17:20:32,935 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2020-09-24 17:20:32,936 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-09-24 17:20:32,940 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28.
[2020-09-24 17:20:32,940 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28 states.
[2020-09-24 17:20:32,941 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions.
[2020-09-24 17:20:32,942 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 25
[2020-09-24 17:20:32,942 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:32,942 INFO  L479      AbstractCegarLoop]: Abstraction has 28 states and 29 transitions.
[2020-09-24 17:20:32,942 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-09-24 17:20:32,942 INFO  L276                IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions.
[2020-09-24 17:20:32,943 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-09-24 17:20:32,943 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:32,944 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:32,944 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-09-24 17:20:32,944 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:32,944 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:32,945 INFO  L82        PathProgramCache]: Analyzing trace with hash -1778100254, now seen corresponding path program 2 times
[2020-09-24 17:20:32,945 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:32,945 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626120302]
[2020-09-24 17:20:32,945 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:32,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:32,964 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:33,143 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:33,144 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 35
[2020-09-24 17:20:33,144 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:33,144 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 188
[2020-09-24 17:20:33,145 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:33,145 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 13
[2020-09-24 17:20:33,145 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 14
[2020-09-24 17:20:33,145 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 20
[2020-09-24 17:20:33,145 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:33,429 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:33,430 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:33,431 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:33,432 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:33,433 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:33,433 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:33,433 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:33,433 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:33,434 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:33,434 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:33,434 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:33,435 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:20:33,439 INFO  L134       CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:33,440 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626120302]
[2020-09-24 17:20:33,440 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:33,440 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14
[2020-09-24 17:20:33,440 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659815247]
[2020-09-24 17:20:33,441 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-09-24 17:20:33,441 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:33,442 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-09-24 17:20:33,442 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182
[2020-09-24 17:20:33,442 INFO  L87              Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states.
[2020-09-24 17:20:33,882 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:33,882 INFO  L93              Difference]: Finished difference Result 42 states and 44 transitions.
[2020-09-24 17:20:33,883 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2020-09-24 17:20:33,883 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 26
[2020-09-24 17:20:33,883 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:33,884 INFO  L225             Difference]: With dead ends: 42
[2020-09-24 17:20:33,884 INFO  L226             Difference]: Without dead ends: 37
[2020-09-24 17:20:33,885 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506
[2020-09-24 17:20:33,886 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 37 states.
[2020-09-24 17:20:33,890 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33.
[2020-09-24 17:20:33,891 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 33 states.
[2020-09-24 17:20:33,891 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions.
[2020-09-24 17:20:33,892 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 26
[2020-09-24 17:20:33,892 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:33,892 INFO  L479      AbstractCegarLoop]: Abstraction has 33 states and 34 transitions.
[2020-09-24 17:20:33,892 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-09-24 17:20:33,893 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions.
[2020-09-24 17:20:33,893 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-09-24 17:20:33,894 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:33,894 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:33,894 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-09-24 17:20:33,894 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:33,895 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:33,895 INFO  L82        PathProgramCache]: Analyzing trace with hash -1884066515, now seen corresponding path program 2 times
[2020-09-24 17:20:33,895 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:33,895 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645501528]
[2020-09-24 17:20:33,896 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:33,904 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:33,911 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:34,004 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:34,005 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 40
[2020-09-24 17:20:34,005 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:34,005 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 99
[2020-09-24 17:20:34,005 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:34,005 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 6
[2020-09-24 17:20:34,006 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:34,006 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 15
[2020-09-24 17:20:34,006 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:34,045 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:34,046 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:34,047 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:34,049 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:34,049 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:34,049 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:34,050 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:34,050 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:34,050 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:34,050 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:34,051 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:34,051 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:34,053 INFO  L134       CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:34,054 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645501528]
[2020-09-24 17:20:34,054 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:34,054 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-09-24 17:20:34,055 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970127301]
[2020-09-24 17:20:34,055 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-09-24 17:20:34,055 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:34,056 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-09-24 17:20:34,056 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2020-09-24 17:20:34,056 INFO  L87              Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 7 states.
[2020-09-24 17:20:34,134 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:34,134 INFO  L93              Difference]: Finished difference Result 48 states and 51 transitions.
[2020-09-24 17:20:34,135 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-09-24 17:20:34,135 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 31
[2020-09-24 17:20:34,135 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:34,136 INFO  L225             Difference]: With dead ends: 48
[2020-09-24 17:20:34,136 INFO  L226             Difference]: Without dead ends: 37
[2020-09-24 17:20:34,137 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110
[2020-09-24 17:20:34,137 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 37 states.
[2020-09-24 17:20:34,141 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34.
[2020-09-24 17:20:34,141 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 34 states.
[2020-09-24 17:20:34,142 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions.
[2020-09-24 17:20:34,143 INFO  L78                 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 31
[2020-09-24 17:20:34,143 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:34,143 INFO  L479      AbstractCegarLoop]: Abstraction has 34 states and 35 transitions.
[2020-09-24 17:20:34,143 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-09-24 17:20:34,143 INFO  L276                IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions.
[2020-09-24 17:20:34,144 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 33
[2020-09-24 17:20:34,144 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:34,145 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:34,145 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-09-24 17:20:34,145 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:34,145 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:34,146 INFO  L82        PathProgramCache]: Analyzing trace with hash -1363892486, now seen corresponding path program 3 times
[2020-09-24 17:20:34,146 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:34,146 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [274822002]
[2020-09-24 17:20:34,146 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:34,163 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:34,174 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:34,561 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:34,561 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 41
[2020-09-24 17:20:34,561 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:34,564 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 396
[2020-09-24 17:20:34,565 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:34,565 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 16
[2020-09-24 17:20:34,565 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 14
[2020-09-24 17:20:34,566 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 26
[2020-09-24 17:20:34,566 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-09-24 17:20:34,852 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:34,853 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:34,855 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:34,856 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:34,856 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:34,856 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:34,857 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:34,858 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:34,858 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:34,858 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:34,858 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:34,859 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:34,865 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked.
[2020-09-24 17:20:34,866 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [274822002]
[2020-09-24 17:20:34,866 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:34,866 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-09-24 17:20:34,867 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130553650]
[2020-09-24 17:20:34,868 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-09-24 17:20:34,868 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:34,868 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-09-24 17:20:34,869 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156
[2020-09-24 17:20:34,869 INFO  L87              Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 13 states.
[2020-09-24 17:20:35,272 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:35,272 INFO  L93              Difference]: Finished difference Result 47 states and 49 transitions.
[2020-09-24 17:20:35,273 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-09-24 17:20:35,273 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 32
[2020-09-24 17:20:35,273 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:35,274 INFO  L225             Difference]: With dead ends: 47
[2020-09-24 17:20:35,274 INFO  L226             Difference]: Without dead ends: 42
[2020-09-24 17:20:35,275 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462
[2020-09-24 17:20:35,276 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 42 states.
[2020-09-24 17:20:35,287 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40.
[2020-09-24 17:20:35,288 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 40 states.
[2020-09-24 17:20:35,289 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions.
[2020-09-24 17:20:35,289 INFO  L78                 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 32
[2020-09-24 17:20:35,290 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:35,290 INFO  L479      AbstractCegarLoop]: Abstraction has 40 states and 42 transitions.
[2020-09-24 17:20:35,290 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-09-24 17:20:35,290 INFO  L276                IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions.
[2020-09-24 17:20:35,291 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2020-09-24 17:20:35,291 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:35,292 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:35,293 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-09-24 17:20:35,293 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:35,294 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:35,294 INFO  L82        PathProgramCache]: Analyzing trace with hash 1557187861, now seen corresponding path program 3 times
[2020-09-24 17:20:35,294 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:35,295 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970333344]
[2020-09-24 17:20:35,295 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:35,313 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:35,322 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:35,479 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:35,479 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 46
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 164
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 8
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:35,480 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 21
[2020-09-24 17:20:35,481 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:35,550 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:35,551 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:35,553 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:35,554 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:35,554 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:35,554 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:35,554 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:20:35,554 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:35,555 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:35,555 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:35,555 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:35,555 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:35,558 INFO  L134       CoverageAnalysis]: Checked inductivity of 37 backedges. 13 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:35,558 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970333344]
[2020-09-24 17:20:35,558 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:35,559 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-09-24 17:20:35,559 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647456591]
[2020-09-24 17:20:35,559 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-09-24 17:20:35,560 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:35,560 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-09-24 17:20:35,560 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72
[2020-09-24 17:20:35,560 INFO  L87              Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 9 states.
[2020-09-24 17:20:35,670 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:35,671 INFO  L93              Difference]: Finished difference Result 60 states and 64 transitions.
[2020-09-24 17:20:35,671 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-09-24 17:20:35,671 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 37
[2020-09-24 17:20:35,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:35,672 INFO  L225             Difference]: With dead ends: 60
[2020-09-24 17:20:35,672 INFO  L226             Difference]: Without dead ends: 49
[2020-09-24 17:20:35,673 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210
[2020-09-24 17:20:35,674 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 49 states.
[2020-09-24 17:20:35,678 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46.
[2020-09-24 17:20:35,678 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 46 states.
[2020-09-24 17:20:35,679 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions.
[2020-09-24 17:20:35,679 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 37
[2020-09-24 17:20:35,680 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:35,680 INFO  L479      AbstractCegarLoop]: Abstraction has 46 states and 48 transitions.
[2020-09-24 17:20:35,680 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-09-24 17:20:35,680 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions.
[2020-09-24 17:20:35,681 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 44
[2020-09-24 17:20:35,681 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:35,681 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:35,682 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-09-24 17:20:35,682 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:35,682 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:35,682 INFO  L82        PathProgramCache]: Analyzing trace with hash -2133811459, now seen corresponding path program 4 times
[2020-09-24 17:20:35,683 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:35,683 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042732029]
[2020-09-24 17:20:35,683 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:35,694 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:35,704 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:35,894 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:35,894 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 52
[2020-09-24 17:20:35,894 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:35,895 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 199
[2020-09-24 17:20:35,895 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:35,895 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 10
[2020-09-24 17:20:35,895 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:35,895 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 27
[2020-09-24 17:20:35,896 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:35,992 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:35,993 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:35,994 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:35,995 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:35,995 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:35,996 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:35,996 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:20:35,996 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:35,996 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:35,996 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:35,997 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:35,997 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:36,002 INFO  L134       CoverageAnalysis]: Checked inductivity of 61 backedges. 17 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:36,008 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042732029]
[2020-09-24 17:20:36,009 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:36,009 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-09-24 17:20:36,009 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807728767]
[2020-09-24 17:20:36,009 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-09-24 17:20:36,010 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:36,010 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-09-24 17:20:36,010 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110
[2020-09-24 17:20:36,010 INFO  L87              Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 11 states.
[2020-09-24 17:20:36,178 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:36,178 INFO  L93              Difference]: Finished difference Result 66 states and 70 transitions.
[2020-09-24 17:20:36,179 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-09-24 17:20:36,179 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 43
[2020-09-24 17:20:36,179 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:36,180 INFO  L225             Difference]: With dead ends: 66
[2020-09-24 17:20:36,180 INFO  L226             Difference]: Without dead ends: 55
[2020-09-24 17:20:36,181 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=219, Unknown=0, NotChecked=0, Total=342
[2020-09-24 17:20:36,181 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-09-24 17:20:36,192 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52.
[2020-09-24 17:20:36,192 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 52 states.
[2020-09-24 17:20:36,194 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions.
[2020-09-24 17:20:36,195 INFO  L78                 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43
[2020-09-24 17:20:36,195 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:36,195 INFO  L479      AbstractCegarLoop]: Abstraction has 52 states and 54 transitions.
[2020-09-24 17:20:36,195 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-09-24 17:20:36,196 INFO  L276                IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions.
[2020-09-24 17:20:36,198 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 50
[2020-09-24 17:20:36,199 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:36,199 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:36,199 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8
[2020-09-24 17:20:36,199 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:36,200 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:36,202 INFO  L82        PathProgramCache]: Analyzing trace with hash 1351967461, now seen corresponding path program 5 times
[2020-09-24 17:20:36,202 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:36,202 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471144583]
[2020-09-24 17:20:36,202 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:36,217 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:36,232 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:36,540 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:36,540 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 58
[2020-09-24 17:20:36,540 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:36,540 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 319
[2020-09-24 17:20:36,540 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:36,541 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 12
[2020-09-24 17:20:36,541 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:36,541 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 33
[2020-09-24 17:20:36,541 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:36,642 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:36,643 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:36,644 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:36,645 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:36,645 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:36,645 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:36,646 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:20:36,646 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:36,646 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:36,646 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:36,646 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:36,647 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:36,650 INFO  L134       CoverageAnalysis]: Checked inductivity of 91 backedges. 21 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:36,650 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471144583]
[2020-09-24 17:20:36,650 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:36,651 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-09-24 17:20:36,651 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456878484]
[2020-09-24 17:20:36,651 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-09-24 17:20:36,652 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:36,652 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-09-24 17:20:36,652 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156
[2020-09-24 17:20:36,652 INFO  L87              Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 13 states.
[2020-09-24 17:20:36,852 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:36,852 INFO  L93              Difference]: Finished difference Result 72 states and 76 transitions.
[2020-09-24 17:20:36,853 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2020-09-24 17:20:36,853 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 49
[2020-09-24 17:20:36,854 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:36,854 INFO  L225             Difference]: With dead ends: 72
[2020-09-24 17:20:36,855 INFO  L226             Difference]: Without dead ends: 61
[2020-09-24 17:20:36,858 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=178, Invalid=328, Unknown=0, NotChecked=0, Total=506
[2020-09-24 17:20:36,859 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 61 states.
[2020-09-24 17:20:36,868 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58.
[2020-09-24 17:20:36,869 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 58 states.
[2020-09-24 17:20:36,874 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions.
[2020-09-24 17:20:36,874 INFO  L78                 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 49
[2020-09-24 17:20:36,874 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:36,874 INFO  L479      AbstractCegarLoop]: Abstraction has 58 states and 60 transitions.
[2020-09-24 17:20:36,875 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-09-24 17:20:36,875 INFO  L276                IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions.
[2020-09-24 17:20:36,875 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 56
[2020-09-24 17:20:36,876 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:36,876 INFO  L422         BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:36,876 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9
[2020-09-24 17:20:36,876 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:36,876 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:36,877 INFO  L82        PathProgramCache]: Analyzing trace with hash -1927178035, now seen corresponding path program 6 times
[2020-09-24 17:20:36,877 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:36,877 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347733316]
[2020-09-24 17:20:36,877 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:36,892 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:36,904 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:37,254 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:37,254 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 64
[2020-09-24 17:20:37,254 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:37,255 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 361
[2020-09-24 17:20:37,255 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:37,255 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 14
[2020-09-24 17:20:37,255 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:37,256 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 39
[2020-09-24 17:20:37,256 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:37,401 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:37,402 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:37,403 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:37,404 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:37,404 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:37,405 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:37,405 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:20:37,405 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:37,405 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:37,406 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:37,406 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:37,406 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:37,410 INFO  L134       CoverageAnalysis]: Checked inductivity of 127 backedges. 25 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:37,410 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347733316]
[2020-09-24 17:20:37,411 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:37,411 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15
[2020-09-24 17:20:37,411 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153487202]
[2020-09-24 17:20:37,412 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-09-24 17:20:37,412 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:37,412 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-09-24 17:20:37,413 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210
[2020-09-24 17:20:37,413 INFO  L87              Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 15 states.
[2020-09-24 17:20:37,659 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:37,659 INFO  L93              Difference]: Finished difference Result 78 states and 82 transitions.
[2020-09-24 17:20:37,660 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. 
[2020-09-24 17:20:37,660 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 55
[2020-09-24 17:20:37,660 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:37,661 INFO  L225             Difference]: With dead ends: 78
[2020-09-24 17:20:37,661 INFO  L226             Difference]: Without dead ends: 67
[2020-09-24 17:20:37,665 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702
[2020-09-24 17:20:37,666 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 67 states.
[2020-09-24 17:20:37,676 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64.
[2020-09-24 17:20:37,676 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 64 states.
[2020-09-24 17:20:37,677 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions.
[2020-09-24 17:20:37,678 INFO  L78                 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55
[2020-09-24 17:20:37,678 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:37,678 INFO  L479      AbstractCegarLoop]: Abstraction has 64 states and 66 transitions.
[2020-09-24 17:20:37,678 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-09-24 17:20:37,678 INFO  L276                IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions.
[2020-09-24 17:20:37,679 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 62
[2020-09-24 17:20:37,679 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:37,679 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:37,679 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10
[2020-09-24 17:20:37,683 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:37,684 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:37,684 INFO  L82        PathProgramCache]: Analyzing trace with hash -879247179, now seen corresponding path program 7 times
[2020-09-24 17:20:37,684 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:37,684 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891210882]
[2020-09-24 17:20:37,684 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:37,699 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:37,712 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:38,180 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 70
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 480
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 16
[2020-09-24 17:20:38,181 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:38,182 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 45
[2020-09-24 17:20:38,182 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:38,400 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:38,401 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:38,402 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:38,403 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:38,404 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:38,404 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:38,404 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-09-24 17:20:38,404 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:38,405 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:38,406 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:38,407 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:38,407 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 2
[2020-09-24 17:20:38,412 INFO  L134       CoverageAnalysis]: Checked inductivity of 169 backedges. 29 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:38,413 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891210882]
[2020-09-24 17:20:38,414 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:38,414 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17
[2020-09-24 17:20:38,414 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008980750]
[2020-09-24 17:20:38,415 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-09-24 17:20:38,415 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:38,415 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-09-24 17:20:38,415 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272
[2020-09-24 17:20:38,416 INFO  L87              Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 17 states.
[2020-09-24 17:20:38,700 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:38,701 INFO  L93              Difference]: Finished difference Result 84 states and 88 transitions.
[2020-09-24 17:20:38,702 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-09-24 17:20:38,702 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 61
[2020-09-24 17:20:38,703 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:38,703 INFO  L225             Difference]: With dead ends: 84
[2020-09-24 17:20:38,703 INFO  L226             Difference]: Without dead ends: 73
[2020-09-24 17:20:38,704 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=318, Invalid=612, Unknown=0, NotChecked=0, Total=930
[2020-09-24 17:20:38,705 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 73 states.
[2020-09-24 17:20:38,715 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70.
[2020-09-24 17:20:38,718 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 70 states.
[2020-09-24 17:20:38,719 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions.
[2020-09-24 17:20:38,719 INFO  L78                 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 61
[2020-09-24 17:20:38,723 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:38,723 INFO  L479      AbstractCegarLoop]: Abstraction has 70 states and 72 transitions.
[2020-09-24 17:20:38,723 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-09-24 17:20:38,723 INFO  L276                IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions.
[2020-09-24 17:20:38,724 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 68
[2020-09-24 17:20:38,724 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:38,724 INFO  L422         BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:38,725 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11
[2020-09-24 17:20:38,727 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:38,727 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:38,727 INFO  L82        PathProgramCache]: Analyzing trace with hash -583378275, now seen corresponding path program 8 times
[2020-09-24 17:20:38,728 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:38,728 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799706077]
[2020-09-24 17:20:38,728 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:38,747 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:38,763 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:39,311 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:39,311 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 76
[2020-09-24 17:20:39,311 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:39,312 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 563
[2020-09-24 17:20:39,312 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:39,312 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 18
[2020-09-24 17:20:39,312 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 15
[2020-09-24 17:20:39,312 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 51
[2020-09-24 17:20:39,313 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:39,582 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 17:20:39,584 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 17:20:39,585 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-09-24 17:20:39,586 FATAL L256   erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set)
[2020-09-24 17:20:39,587 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 8
[2020-09-24 17:20:39,587 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-09-24 17:20:39,587 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-09-24 17:20:39,587 FATAL L256   erpolLogProxyWrapper]: Heuristic: RANDOM
[2020-09-24 17:20:39,587 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-09-24 17:20:39,588 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 2
[2020-09-24 17:20:39,588 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-09-24 17:20:39,588 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-09-24 17:20:39,597 INFO  L134       CoverageAnalysis]: Checked inductivity of 217 backedges. 33 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 17:20:39,597 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799706077]
[2020-09-24 17:20:39,597 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 17:20:39,597 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19
[2020-09-24 17:20:39,598 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564523549]
[2020-09-24 17:20:39,599 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-09-24 17:20:39,599 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 17:20:39,600 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-09-24 17:20:39,601 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342
[2020-09-24 17:20:39,601 INFO  L87              Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 19 states.
[2020-09-24 17:20:39,991 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 17:20:39,991 INFO  L93              Difference]: Finished difference Result 89 states and 93 transitions.
[2020-09-24 17:20:39,991 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. 
[2020-09-24 17:20:39,992 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 67
[2020-09-24 17:20:39,992 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 17:20:39,993 INFO  L225             Difference]: With dead ends: 89
[2020-09-24 17:20:39,994 INFO  L226             Difference]: Without dead ends: 78
[2020-09-24 17:20:39,995 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190
[2020-09-24 17:20:39,996 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 78 states.
[2020-09-24 17:20:40,001 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76.
[2020-09-24 17:20:40,001 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 76 states.
[2020-09-24 17:20:40,002 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions.
[2020-09-24 17:20:40,002 INFO  L78                 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 67
[2020-09-24 17:20:40,002 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 17:20:40,003 INFO  L479      AbstractCegarLoop]: Abstraction has 76 states and 78 transitions.
[2020-09-24 17:20:40,003 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-09-24 17:20:40,003 INFO  L276                IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions.
[2020-09-24 17:20:40,004 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 74
[2020-09-24 17:20:40,004 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 17:20:40,004 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 17:20:40,004 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12
[2020-09-24 17:20:40,005 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 17:20:40,005 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 17:20:40,005 INFO  L82        PathProgramCache]: Analyzing trace with hash 929818245, now seen corresponding path program 9 times
[2020-09-24 17:20:40,005 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 17:20:40,006 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519628099]
[2020-09-24 17:20:40,006 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 17:20:40,023 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-09-24 17:20:40,025 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-09-24 17:20:40,025 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-09-24 17:20:40,030 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13
[2020-09-24 17:20:40,052 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 05:20:40 BoogieIcfgContainer
[2020-09-24 17:20:40,053 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-09-24 17:20:40,056 INFO  L168              Benchmark]: Toolchain (without parser) took 9957.90 ms. Allocated memory was 139.5 MB in the beginning and 305.7 MB in the end (delta: 166.2 MB). Free memory was 102.8 MB in the beginning and 92.8 MB in the end (delta: 10.0 MB). Peak memory consumption was 176.2 MB. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,057 INFO  L168              Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,058 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 312.72 ms. Allocated memory is still 139.5 MB. Free memory was 102.1 MB in the beginning and 92.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,058 INFO  L168              Benchmark]: Boogie Preprocessor took 123.27 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 92.7 MB in the beginning and 181.9 MB in the end (delta: -89.2 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,059 INFO  L168              Benchmark]: RCFGBuilder took 296.60 ms. Allocated memory is still 201.9 MB. Free memory was 181.9 MB in the beginning and 169.1 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,060 INFO  L168              Benchmark]: TraceAbstraction took 9215.09 ms. Allocated memory was 201.9 MB in the beginning and 305.7 MB in the end (delta: 103.8 MB). Free memory was 168.4 MB in the beginning and 92.8 MB in the end (delta: 75.7 MB). Peak memory consumption was 179.5 MB. Max. memory is 7.1 GB.
[2020-09-24 17:20:40,063 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 312.72 ms. Allocated memory is still 139.5 MB. Free memory was 102.1 MB in the beginning and 92.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 123.27 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 92.7 MB in the beginning and 181.9 MB in the end (delta: -89.2 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 296.60 ms. Allocated memory is still 201.9 MB. Free memory was 181.9 MB in the beginning and 169.1 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 9215.09 ms. Allocated memory was 201.9 MB in the beginning and 305.7 MB in the end (delta: 103.8 MB). Free memory was 168.4 MB in the beginning and 92.8 MB in the end (delta: 75.7 MB). Peak memory consumption was 179.5 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L12]              int i, n=__VERIFIER_nondet_uint(), sn=0;
[L12]              int i, n=__VERIFIER_nondet_uint(), sn=0;
[L13]              i=1
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND TRUE   i<10
[L15]              sn = sn + (2)
[L13]              i++
[L13]  COND TRUE   i<=n
[L14]  COND FALSE  !(i<10)
[L13]              i++
[L13]  COND FALSE  !(i<=n)
[L17]  CALL        __VERIFIER_assert(sn==n*(2) || sn == 0)
[L4]   COND TRUE   !(cond)
[L5]               __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.0s, OverallIterations: 14, TraceHistogramMax: 10, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 222 SDtfs, 201 SDslu, 1069 SDs, 0 SdLazy, 775 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 266 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=76occurred in iteration=13, 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, 13 MinimizatonAttempts, 32 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 5.6s InterpolantComputationTime, 547 NumberOfCodeBlocks, 547 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 461 ConstructedInterpolants, 0 QuantifiedInterpolants, 60623 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 13 InterpolantComputations, 2 PerfectInterpolantSequences, 160/758 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 incorrect!
Received shutdown request...