/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 SequenceOfStatements --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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c


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


This is Ultimate 0.1.25-adbd35c
[2020-10-13 10:45:22,358 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-10-13 10:45:22,361 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-10-13 10:45:22,384 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-10-13 10:45:22,384 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-10-13 10:45:22,385 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-10-13 10:45:22,387 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-10-13 10:45:22,388 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-10-13 10:45:22,390 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-10-13 10:45:22,391 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-10-13 10:45:22,392 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-10-13 10:45:22,393 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-10-13 10:45:22,393 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-10-13 10:45:22,394 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-10-13 10:45:22,395 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-10-13 10:45:22,396 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-10-13 10:45:22,397 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-10-13 10:45:22,398 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-10-13 10:45:22,399 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-10-13 10:45:22,401 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-10-13 10:45:22,403 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-10-13 10:45:22,404 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-10-13 10:45:22,405 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-10-13 10:45:22,406 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-10-13 10:45:22,408 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-10-13 10:45:22,409 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-10-13 10:45:22,409 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-10-13 10:45:22,410 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-10-13 10:45:22,410 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-10-13 10:45:22,411 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-10-13 10:45:22,412 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-10-13 10:45:22,412 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-10-13 10:45:22,413 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-10-13 10:45:22,414 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-10-13 10:45:22,415 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-10-13 10:45:22,415 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-10-13 10:45:22,416 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-10-13 10:45:22,416 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-10-13 10:45:22,416 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-10-13 10:45:22,417 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-10-13 10:45:22,417 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-10-13 10:45:22,418 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
[2020-10-13 10:45:22,440 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-10-13 10:45:22,440 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-10-13 10:45:22,441 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-10-13 10:45:22,441 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-10-13 10:45:22,442 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-10-13 10:45:22,442 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-10-13 10:45:22,442 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-10-13 10:45:22,442 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-10-13 10:45:22,442 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-10-13 10:45:22,443 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-10-13 10:45:22,443 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-10-13 10:45:22,443 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-10-13 10:45:22,443 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-10-13 10:45:22,444 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-10-13 10:45:22,444 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-10-13 10:45:22,444 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-10-13 10:45:22,444 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-10-13 10:45:22,444 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-10-13 10:45:22,445 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-10-13 10:45:22,445 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-10-13 10:45:22,445 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-10-13 10:45:22,445 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-10-13 10:45:22,445 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-10-13 10:45:22,446 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-10-13 10:45:22,447 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 -> SequenceOfStatements
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;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true;
[2020-10-13 10:45:22,752 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-10-13 10:45:22,765 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-10-13 10:45:22,768 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-10-13 10:45:22,770 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-10-13 10:45:22,770 INFO  L275        PluginConnector]: CDTParser initialized
[2020-10-13 10:45:22,771 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c
[2020-10-13 10:45:22,844 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c/FLAGf0ae6fdcb
[2020-10-13 10:45:23,262 INFO  L306              CDTParser]: Found 1 translation units.
[2020-10-13 10:45:23,263 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/phases_1-2.c
[2020-10-13 10:45:23,269 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c/FLAGf0ae6fdcb
[2020-10-13 10:45:23,653 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c
[2020-10-13 10:45:23,662 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-10-13 10:45:23,664 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-10-13 10:45:23,665 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-10-13 10:45:23,665 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-10-13 10:45:23,669 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-10-13 10:45:23,670 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:23,673 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@674884e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23, skipping insertion in model container
[2020-10-13 10:45:23,674 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:23,682 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-10-13 10:45:23,700 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-10-13 10:45:23,885 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-13 10:45:23,889 INFO  L203         MainTranslator]: Completed pre-run
[2020-10-13 10:45:23,909 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-13 10:45:23,921 INFO  L208         MainTranslator]: Completed translation
[2020-10-13 10:45:23,921 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23 WrapperNode
[2020-10-13 10:45:23,922 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-10-13 10:45:23,922 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-10-13 10:45:23,922 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-10-13 10:45:23,922 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-10-13 10:45:23,931 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:23,931 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,011 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,012 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,021 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,026 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,027 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ...
[2020-10-13 10:45:24,030 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-10-13 10:45:24,030 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-10-13 10:45:24,030 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-10-13 10:45:24,030 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-10-13 10:45:24,031 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (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
[2020-10-13 10:45:24,081 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-10-13 10:45:24,081 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-10-13 10:45:24,081 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-10-13 10:45:24,081 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-10-13 10:45:24,081 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-10-13 10:45:24,082 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-10-13 10:45:24,082 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-10-13 10:45:24,082 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-10-13 10:45:24,082 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-10-13 10:45:24,236 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-10-13 10:45:24,236 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-10-13 10:45:24,240 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:45:24 BoogieIcfgContainer
[2020-10-13 10:45:24,240 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-10-13 10:45:24,241 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-10-13 10:45:24,241 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-10-13 10:45:24,244 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-10-13 10:45:24,244 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 10:45:23" (1/3) ...
[2020-10-13 10:45:24,245 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a43e790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:45:24, skipping insertion in model container
[2020-10-13 10:45:24,245 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (2/3) ...
[2020-10-13 10:45:24,246 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a43e790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:45:24, skipping insertion in model container
[2020-10-13 10:45:24,246 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:45:24" (3/3) ...
[2020-10-13 10:45:24,248 INFO  L109   eAbstractionObserver]: Analyzing ICFG phases_1-2.c
[2020-10-13 10:45:24,258 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-10-13 10:45:24,264 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-10-13 10:45:24,277 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-10-13 10:45:24,297 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-10-13 10:45:24,298 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-10-13 10:45:24,298 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-10-13 10:45:24,298 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-10-13 10:45:24,298 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-10-13 10:45:24,298 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-10-13 10:45:24,299 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-10-13 10:45:24,299 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-10-13 10:45:24,315 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states.
[2020-10-13 10:45:24,320 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2020-10-13 10:45:24,321 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:24,322 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:24,322 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:24,328 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:24,328 INFO  L82        PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times
[2020-10-13 10:45:24,337 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:24,337 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310242059]
[2020-10-13 10:45:24,337 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:24,409 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:24,422 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:24,463 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:24,622 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:24,622 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 18
[2020-10-13 10:45:24,622 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:24,623 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 208
[2020-10-13 10:45:24,627 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:24,628 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:24,628 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 11
[2020-10-13 10:45:24,628 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:24,628 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 5
[2020-10-13 10:45:24,656 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:24,659 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:24,662 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:24,674 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:24,675 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:24,675 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:24,675 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 14
[2020-10-13 10:45:24,675 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:24,676 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:24,676 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:24,676 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:24,677 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:24,683 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-13 10:45:24,684 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310242059]
[2020-10-13 10:45:24,685 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-13 10:45:24,686 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2020-10-13 10:45:24,686 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402781900]
[2020-10-13 10:45:24,690 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 2 states
[2020-10-13 10:45:24,691 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:24,700 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2020-10-13 10:45:24,701 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-10-13 10:45:24,702 INFO  L87              Difference]: Start difference. First operand 18 states. Second operand 2 states.
[2020-10-13 10:45:24,719 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:24,719 INFO  L93              Difference]: Finished difference Result 29 states and 33 transitions.
[2020-10-13 10:45:24,720 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2020-10-13 10:45:24,721 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 10
[2020-10-13 10:45:24,721 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:24,727 INFO  L225             Difference]: With dead ends: 29
[2020-10-13 10:45:24,727 INFO  L226             Difference]: Without dead ends: 12
[2020-10-13 10:45:24,730 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
[2020-10-13 10:45:24,747 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 12 states.
[2020-10-13 10:45:24,759 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12.
[2020-10-13 10:45:24,760 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 12 states.
[2020-10-13 10:45:24,761 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions.
[2020-10-13 10:45:24,762 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10
[2020-10-13 10:45:24,762 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:24,763 INFO  L479      AbstractCegarLoop]: Abstraction has 12 states and 13 transitions.
[2020-10-13 10:45:24,763 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2020-10-13 10:45:24,763 INFO  L276                IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions.
[2020-10-13 10:45:24,764 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2020-10-13 10:45:24,764 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:24,764 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:24,764 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-10-13 10:45:24,765 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:24,765 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:24,765 INFO  L82        PathProgramCache]: Analyzing trace with hash -730736584, now seen corresponding path program 1 times
[2020-10-13 10:45:24,766 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:24,766 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646261165]
[2020-10-13 10:45:24,766 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:24,776 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:24,784 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:24,801 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:24,905 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:24,906 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 18
[2020-10-13 10:45:24,906 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:24,906 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 127
[2020-10-13 10:45:24,907 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:24,907 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-10-13 10:45:24,907 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:24,908 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 2
[2020-10-13 10:45:24,908 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:25,071 WARN  L193               SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5
[2020-10-13 10:45:25,073 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:25,074 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,075 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,077 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,077 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:25,078 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:25,078 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-10-13 10:45:25,078 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,079 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:25,079 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:25,080 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:25,080 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:25,082 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-13 10:45:25,082 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646261165]
[2020-10-13 10:45:25,083 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-13 10:45:25,083 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-10-13 10:45:25,083 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851396410]
[2020-10-13 10:45:25,085 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-10-13 10:45:25,085 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,085 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-10-13 10:45:25,086 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-13 10:45:25,086 INFO  L87              Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 3 states.
[2020-10-13 10:45:25,107 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:25,107 INFO  L93              Difference]: Finished difference Result 21 states and 25 transitions.
[2020-10-13 10:45:25,108 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-10-13 10:45:25,108 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 10
[2020-10-13 10:45:25,108 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:25,109 INFO  L225             Difference]: With dead ends: 21
[2020-10-13 10:45:25,109 INFO  L226             Difference]: Without dead ends: 14
[2020-10-13 10:45:25,110 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-13 10:45:25,111 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2020-10-13 10:45:25,114 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14.
[2020-10-13 10:45:25,115 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 14 states.
[2020-10-13 10:45:25,115 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions.
[2020-10-13 10:45:25,116 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10
[2020-10-13 10:45:25,116 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:25,116 INFO  L479      AbstractCegarLoop]: Abstraction has 14 states and 15 transitions.
[2020-10-13 10:45:25,116 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-10-13 10:45:25,116 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions.
[2020-10-13 10:45:25,117 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-10-13 10:45:25,117 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:25,117 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:25,118 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-10-13 10:45:25,118 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:25,118 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:25,118 INFO  L82        PathProgramCache]: Analyzing trace with hash -1082855947, now seen corresponding path program 1 times
[2020-10-13 10:45:25,119 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,119 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179653818]
[2020-10-13 10:45:25,119 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:25,129 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,136 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,170 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,171 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 20
[2020-10-13 10:45:25,171 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:25,171 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 40
[2020-10-13 10:45:25,171 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,172 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 2
[2020-10-13 10:45:25,172 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 12
[2020-10-13 10:45:25,172 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 2
[2020-10-13 10:45:25,172 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:25,195 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:25,196 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,197 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,198 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,199 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:25,199 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:25,199 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:25,199 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,199 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:25,200 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:25,200 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:25,200 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:25,202 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-13 10:45:25,203 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179653818]
[2020-10-13 10:45:25,203 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-13 10:45:25,203 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-10-13 10:45:25,204 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080286236]
[2020-10-13 10:45:25,204 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-10-13 10:45:25,204 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,205 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-10-13 10:45:25,205 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-13 10:45:25,205 INFO  L87              Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states.
[2020-10-13 10:45:25,231 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:25,231 INFO  L93              Difference]: Finished difference Result 21 states and 23 transitions.
[2020-10-13 10:45:25,231 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-10-13 10:45:25,232 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 12
[2020-10-13 10:45:25,232 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:25,233 INFO  L225             Difference]: With dead ends: 21
[2020-10-13 10:45:25,233 INFO  L226             Difference]: Without dead ends: 16
[2020-10-13 10:45:25,233 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-13 10:45:25,234 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16 states.
[2020-10-13 10:45:25,237 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15.
[2020-10-13 10:45:25,237 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15 states.
[2020-10-13 10:45:25,238 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions.
[2020-10-13 10:45:25,239 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12
[2020-10-13 10:45:25,239 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:25,239 INFO  L479      AbstractCegarLoop]: Abstraction has 15 states and 16 transitions.
[2020-10-13 10:45:25,239 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-10-13 10:45:25,239 INFO  L276                IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions.
[2020-10-13 10:45:25,240 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-10-13 10:45:25,240 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:25,240 INFO  L422         BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:25,240 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-10-13 10:45:25,241 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:25,241 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:25,241 INFO  L82        PathProgramCache]: Analyzing trace with hash -109889104, now seen corresponding path program 1 times
[2020-10-13 10:45:25,241 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,242 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997059813]
[2020-10-13 10:45:25,242 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:25,249 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,254 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,288 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,325 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,326 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 22
[2020-10-13 10:45:25,326 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:25,326 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 75
[2020-10-13 10:45:25,326 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,327 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 3
[2020-10-13 10:45:25,327 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 12
[2020-10-13 10:45:25,327 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 4
[2020-10-13 10:45:25,327 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:25,376 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:25,377 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,378 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,379 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,379 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:25,380 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:25,380 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:25,380 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,381 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:25,381 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:25,381 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:25,382 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:25,384 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-13 10:45:25,385 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997059813]
[2020-10-13 10:45:25,385 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:25,385 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4
[2020-10-13 10:45:25,386 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139734463]
[2020-10-13 10:45:25,386 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-10-13 10:45:25,386 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,387 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-10-13 10:45:25,387 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2020-10-13 10:45:25,387 INFO  L87              Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states.
[2020-10-13 10:45:25,426 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:25,427 INFO  L93              Difference]: Finished difference Result 23 states and 26 transitions.
[2020-10-13 10:45:25,428 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-10-13 10:45:25,428 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 14
[2020-10-13 10:45:25,428 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:25,430 INFO  L225             Difference]: With dead ends: 23
[2020-10-13 10:45:25,431 INFO  L226             Difference]: Without dead ends: 18
[2020-10-13 10:45:25,431 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2020-10-13 10:45:25,432 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2020-10-13 10:45:25,437 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17.
[2020-10-13 10:45:25,437 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 17 states.
[2020-10-13 10:45:25,438 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions.
[2020-10-13 10:45:25,438 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14
[2020-10-13 10:45:25,438 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:25,439 INFO  L479      AbstractCegarLoop]: Abstraction has 17 states and 19 transitions.
[2020-10-13 10:45:25,439 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-10-13 10:45:25,439 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions.
[2020-10-13 10:45:25,440 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2020-10-13 10:45:25,440 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:25,440 INFO  L422         BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:25,440 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-10-13 10:45:25,440 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:25,441 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:25,441 INFO  L82        PathProgramCache]: Analyzing trace with hash -1391623509, now seen corresponding path program 2 times
[2020-10-13 10:45:25,441 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,442 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876101042]
[2020-10-13 10:45:25,456 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:25,462 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,475 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,536 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,654 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,655 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 24
[2020-10-13 10:45:25,656 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:25,656 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 186
[2020-10-13 10:45:25,656 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,656 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 3
[2020-10-13 10:45:25,656 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:25,657 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 5
[2020-10-13 10:45:25,657 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:25,708 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:25,709 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,710 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,713 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,713 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:25,713 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:25,713 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-10-13 10:45:25,714 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,714 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:25,714 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:25,714 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:25,714 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:25,718 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-10-13 10:45:25,721 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876101042]
[2020-10-13 10:45:25,722 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:25,722 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4
[2020-10-13 10:45:25,722 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299134163]
[2020-10-13 10:45:25,723 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-10-13 10:45:25,723 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,723 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-10-13 10:45:25,724 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2020-10-13 10:45:25,724 INFO  L87              Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states.
[2020-10-13 10:45:25,749 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:25,750 INFO  L93              Difference]: Finished difference Result 29 states and 34 transitions.
[2020-10-13 10:45:25,752 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-10-13 10:45:25,752 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 16
[2020-10-13 10:45:25,752 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:25,753 INFO  L225             Difference]: With dead ends: 29
[2020-10-13 10:45:25,753 INFO  L226             Difference]: Without dead ends: 19
[2020-10-13 10:45:25,754 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2020-10-13 10:45:25,754 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-10-13 10:45:25,759 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-10-13 10:45:25,759 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-10-13 10:45:25,763 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions.
[2020-10-13 10:45:25,763 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 16
[2020-10-13 10:45:25,763 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:25,763 INFO  L479      AbstractCegarLoop]: Abstraction has 19 states and 21 transitions.
[2020-10-13 10:45:25,763 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-10-13 10:45:25,764 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions.
[2020-10-13 10:45:25,764 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-10-13 10:45:25,764 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:25,765 INFO  L422         BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:25,765 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-10-13 10:45:25,765 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:25,765 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:25,766 INFO  L82        PathProgramCache]: Analyzing trace with hash -89745752, now seen corresponding path program 3 times
[2020-10-13 10:45:25,766 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:25,766 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971049095]
[2020-10-13 10:45:25,767 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:25,782 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:25,790 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,827 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:25,979 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:25,980 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 26
[2020-10-13 10:45:25,980 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:25,980 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 196
[2020-10-13 10:45:25,981 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:25,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-10-13 10:45:25,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 14
[2020-10-13 10:45:25,981 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 6
[2020-10-13 10:45:25,981 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:26,029 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:26,030 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:26,031 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,032 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:26,032 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:26,032 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:26,032 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:26,033 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:26,033 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:26,033 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:26,033 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:26,034 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:26,036 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-10-13 10:45:26,036 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971049095]
[2020-10-13 10:45:26,036 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:26,037 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5
[2020-10-13 10:45:26,037 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435116274]
[2020-10-13 10:45:26,037 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-10-13 10:45:26,038 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:26,038 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-10-13 10:45:26,038 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-10-13 10:45:26,038 INFO  L87              Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states.
[2020-10-13 10:45:26,192 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:26,192 INFO  L93              Difference]: Finished difference Result 29 states and 34 transitions.
[2020-10-13 10:45:26,193 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-10-13 10:45:26,193 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 18
[2020-10-13 10:45:26,194 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:26,194 INFO  L225             Difference]: With dead ends: 29
[2020-10-13 10:45:26,194 INFO  L226             Difference]: Without dead ends: 24
[2020-10-13 10:45:26,195 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30
[2020-10-13 10:45:26,195 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2020-10-13 10:45:26,200 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21.
[2020-10-13 10:45:26,200 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 21 states.
[2020-10-13 10:45:26,201 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions.
[2020-10-13 10:45:26,201 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 18
[2020-10-13 10:45:26,201 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:26,202 INFO  L479      AbstractCegarLoop]: Abstraction has 21 states and 24 transitions.
[2020-10-13 10:45:26,202 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-10-13 10:45:26,202 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions.
[2020-10-13 10:45:26,203 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-10-13 10:45:26,203 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:26,203 INFO  L422         BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:26,203 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-10-13 10:45:26,203 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:26,204 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:26,204 INFO  L82        PathProgramCache]: Analyzing trace with hash 786268579, now seen corresponding path program 4 times
[2020-10-13 10:45:26,204 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:26,204 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565317407]
[2020-10-13 10:45:26,205 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:26,213 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:26,219 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,239 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,445 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:26,445 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 28
[2020-10-13 10:45:26,445 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:26,452 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 231
[2020-10-13 10:45:26,453 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:26,453 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 4
[2020-10-13 10:45:26,453 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:26,453 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 7
[2020-10-13 10:45:26,454 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:26,502 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:26,503 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:26,504 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,505 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:26,505 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:26,505 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:26,506 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:26,506 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:26,506 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:26,506 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:26,507 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:26,507 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:26,509 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2020-10-13 10:45:26,509 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565317407]
[2020-10-13 10:45:26,510 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:26,510 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5
[2020-10-13 10:45:26,510 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648529908]
[2020-10-13 10:45:26,510 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-10-13 10:45:26,511 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:26,511 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-10-13 10:45:26,511 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-10-13 10:45:26,511 INFO  L87              Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 5 states.
[2020-10-13 10:45:26,542 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:26,542 INFO  L93              Difference]: Finished difference Result 35 states and 42 transitions.
[2020-10-13 10:45:26,543 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-10-13 10:45:26,543 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 20
[2020-10-13 10:45:26,543 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:26,544 INFO  L225             Difference]: With dead ends: 35
[2020-10-13 10:45:26,544 INFO  L226             Difference]: Without dead ends: 23
[2020-10-13 10:45:26,545 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-10-13 10:45:26,545 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2020-10-13 10:45:26,550 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23.
[2020-10-13 10:45:26,550 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 23 states.
[2020-10-13 10:45:26,551 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions.
[2020-10-13 10:45:26,551 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 20
[2020-10-13 10:45:26,551 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:26,551 INFO  L479      AbstractCegarLoop]: Abstraction has 23 states and 26 transitions.
[2020-10-13 10:45:26,551 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-10-13 10:45:26,552 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions.
[2020-10-13 10:45:26,552 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-10-13 10:45:26,552 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:26,552 INFO  L422         BasicCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:26,553 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-10-13 10:45:26,553 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:26,553 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:26,553 INFO  L82        PathProgramCache]: Analyzing trace with hash 564285216, now seen corresponding path program 5 times
[2020-10-13 10:45:26,554 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:26,554 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423072679]
[2020-10-13 10:45:26,554 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:26,561 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:26,567 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,597 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,819 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:26,819 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 30
[2020-10-13 10:45:26,820 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:26,820 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 256
[2020-10-13 10:45:26,820 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:26,820 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 5
[2020-10-13 10:45:26,820 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 16
[2020-10-13 10:45:26,821 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 8
[2020-10-13 10:45:26,821 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:26,881 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:26,881 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:26,882 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:26,883 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:26,883 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:26,883 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:26,884 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:26,884 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:26,884 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:26,884 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:26,884 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:26,885 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:26,887 INFO  L134       CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2020-10-13 10:45:26,887 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423072679]
[2020-10-13 10:45:26,888 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:26,888 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6
[2020-10-13 10:45:26,888 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394169717]
[2020-10-13 10:45:26,889 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-10-13 10:45:26,889 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:26,889 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-10-13 10:45:26,889 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30
[2020-10-13 10:45:26,890 INFO  L87              Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 6 states.
[2020-10-13 10:45:27,392 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:27,392 INFO  L93              Difference]: Finished difference Result 33 states and 39 transitions.
[2020-10-13 10:45:27,393 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-10-13 10:45:27,393 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 22
[2020-10-13 10:45:27,393 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:27,394 INFO  L225             Difference]: With dead ends: 33
[2020-10-13 10:45:27,394 INFO  L226             Difference]: Without dead ends: 28
[2020-10-13 10:45:27,395 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56
[2020-10-13 10:45:27,395 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28 states.
[2020-10-13 10:45:27,400 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25.
[2020-10-13 10:45:27,400 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 25 states.
[2020-10-13 10:45:27,401 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions.
[2020-10-13 10:45:27,401 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22
[2020-10-13 10:45:27,401 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:27,401 INFO  L479      AbstractCegarLoop]: Abstraction has 25 states and 29 transitions.
[2020-10-13 10:45:27,401 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-10-13 10:45:27,402 INFO  L276                IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions.
[2020-10-13 10:45:27,402 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-10-13 10:45:27,402 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:27,402 INFO  L422         BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:27,403 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-10-13 10:45:27,403 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:27,403 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:27,403 INFO  L82        PathProgramCache]: Analyzing trace with hash -2050163685, now seen corresponding path program 6 times
[2020-10-13 10:45:27,404 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:27,404 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2884402]
[2020-10-13 10:45:27,404 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:27,414 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:27,419 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:27,437 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:27,754 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:27,755 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 32
[2020-10-13 10:45:27,755 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:27,755 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 340
[2020-10-13 10:45:27,755 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:27,756 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 5
[2020-10-13 10:45:27,756 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:27,756 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 9
[2020-10-13 10:45:27,756 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:27,821 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:27,822 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:27,822 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:27,823 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:27,823 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:27,824 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:27,824 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:27,824 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:27,824 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:27,825 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:27,825 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:27,825 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:27,827 INFO  L134       CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked.
[2020-10-13 10:45:27,827 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2884402]
[2020-10-13 10:45:27,828 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:27,828 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6
[2020-10-13 10:45:27,828 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541136142]
[2020-10-13 10:45:27,829 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-10-13 10:45:27,829 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:27,829 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-10-13 10:45:27,829 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30
[2020-10-13 10:45:27,830 INFO  L87              Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states.
[2020-10-13 10:45:27,869 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:27,870 INFO  L93              Difference]: Finished difference Result 41 states and 50 transitions.
[2020-10-13 10:45:27,870 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-10-13 10:45:27,870 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 24
[2020-10-13 10:45:27,871 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:27,871 INFO  L225             Difference]: With dead ends: 41
[2020-10-13 10:45:27,871 INFO  L226             Difference]: Without dead ends: 27
[2020-10-13 10:45:27,872 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30
[2020-10-13 10:45:27,872 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 27 states.
[2020-10-13 10:45:27,877 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27.
[2020-10-13 10:45:27,877 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 27 states.
[2020-10-13 10:45:27,878 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions.
[2020-10-13 10:45:27,878 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 24
[2020-10-13 10:45:27,878 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:27,878 INFO  L479      AbstractCegarLoop]: Abstraction has 27 states and 31 transitions.
[2020-10-13 10:45:27,878 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-10-13 10:45:27,879 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions.
[2020-10-13 10:45:27,879 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-10-13 10:45:27,879 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:27,880 INFO  L422         BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:27,880 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8
[2020-10-13 10:45:27,880 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:27,880 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:27,880 INFO  L82        PathProgramCache]: Analyzing trace with hash -968572136, now seen corresponding path program 7 times
[2020-10-13 10:45:27,881 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:27,881 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239028577]
[2020-10-13 10:45:27,881 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:27,889 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:27,895 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:27,919 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:28,336 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:28,336 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 34
[2020-10-13 10:45:28,337 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:28,337 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 446
[2020-10-13 10:45:28,337 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:28,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 6
[2020-10-13 10:45:28,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 18
[2020-10-13 10:45:28,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 10
[2020-10-13 10:45:28,338 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:28,422 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:28,423 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:28,424 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:28,424 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:28,425 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:28,425 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:28,425 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:28,425 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:28,426 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:28,426 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:28,426 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:28,426 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:28,429 INFO  L134       CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-10-13 10:45:28,429 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239028577]
[2020-10-13 10:45:28,430 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:28,430 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-10-13 10:45:28,430 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938846042]
[2020-10-13 10:45:28,430 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-10-13 10:45:28,431 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:28,431 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-10-13 10:45:28,431 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2020-10-13 10:45:28,431 INFO  L87              Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 7 states.
[2020-10-13 10:45:34,116 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:34,117 INFO  L93              Difference]: Finished difference Result 39 states and 47 transitions.
[2020-10-13 10:45:34,121 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-10-13 10:45:34,121 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 26
[2020-10-13 10:45:34,122 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:34,122 INFO  L225             Difference]: With dead ends: 39
[2020-10-13 10:45:34,123 INFO  L226             Difference]: Without dead ends: 34
[2020-10-13 10:45:34,123 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110
[2020-10-13 10:45:34,123 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2020-10-13 10:45:34,128 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29.
[2020-10-13 10:45:34,128 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 29 states.
[2020-10-13 10:45:34,129 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions.
[2020-10-13 10:45:34,129 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 26
[2020-10-13 10:45:34,130 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:34,130 INFO  L479      AbstractCegarLoop]: Abstraction has 29 states and 34 transitions.
[2020-10-13 10:45:34,130 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-10-13 10:45:34,130 INFO  L276                IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions.
[2020-10-13 10:45:34,131 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2020-10-13 10:45:34,131 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:34,131 INFO  L422         BasicCegarLoop]: trace histogram [9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:34,131 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9
[2020-10-13 10:45:34,132 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:34,132 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:34,132 INFO  L82        PathProgramCache]: Analyzing trace with hash -1952296429, now seen corresponding path program 8 times
[2020-10-13 10:45:34,132 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:34,133 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543349195]
[2020-10-13 10:45:34,133 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:34,147 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:34,153 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:34,176 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:34,738 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:34,738 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 36
[2020-10-13 10:45:34,739 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:34,739 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 590
[2020-10-13 10:45:34,739 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:34,739 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 6
[2020-10-13 10:45:34,739 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:34,740 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 11
[2020-10-13 10:45:34,740 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:34,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:34,821 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:34,822 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:34,823 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:34,823 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:34,823 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:34,823 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:34,823 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:34,824 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:34,824 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:34,824 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:34,824 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:34,826 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked.
[2020-10-13 10:45:34,827 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543349195]
[2020-10-13 10:45:34,827 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:34,827 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-10-13 10:45:34,828 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819891821]
[2020-10-13 10:45:34,829 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-10-13 10:45:34,829 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:34,829 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-10-13 10:45:34,830 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2020-10-13 10:45:34,830 INFO  L87              Difference]: Start difference. First operand 29 states and 34 transitions. Second operand 7 states.
[2020-10-13 10:45:34,879 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:34,879 INFO  L93              Difference]: Finished difference Result 47 states and 58 transitions.
[2020-10-13 10:45:34,880 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-10-13 10:45:34,880 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 28
[2020-10-13 10:45:34,880 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:34,881 INFO  L225             Difference]: With dead ends: 47
[2020-10-13 10:45:34,881 INFO  L226             Difference]: Without dead ends: 31
[2020-10-13 10:45:34,882 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2020-10-13 10:45:34,882 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-10-13 10:45:34,886 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31.
[2020-10-13 10:45:34,887 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-10-13 10:45:34,887 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions.
[2020-10-13 10:45:34,888 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 28
[2020-10-13 10:45:34,888 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:34,888 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 36 transitions.
[2020-10-13 10:45:34,888 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-10-13 10:45:34,888 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions.
[2020-10-13 10:45:34,889 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-10-13 10:45:34,889 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:34,889 INFO  L422         BasicCegarLoop]: trace histogram [10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:34,889 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10
[2020-10-13 10:45:34,890 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:34,890 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:34,890 INFO  L82        PathProgramCache]: Analyzing trace with hash -1397468528, now seen corresponding path program 9 times
[2020-10-13 10:45:34,890 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:34,890 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502873532]
[2020-10-13 10:45:34,891 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:34,898 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:34,903 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:34,929 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:35,635 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:35,636 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 38
[2020-10-13 10:45:35,636 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:35,636 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 736
[2020-10-13 10:45:35,637 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:35,637 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 7
[2020-10-13 10:45:35,637 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 20
[2020-10-13 10:45:35,637 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 12
[2020-10-13 10:45:35,638 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:37,853 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:37,854 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:37,855 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:37,856 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:37,856 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:37,856 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:37,857 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:37,857 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:37,857 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:37,857 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:37,858 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:37,858 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:37,861 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 25 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked.
[2020-10-13 10:45:37,861 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502873532]
[2020-10-13 10:45:37,862 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:37,862 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2020-10-13 10:45:37,862 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592624442]
[2020-10-13 10:45:37,863 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-10-13 10:45:37,863 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:37,863 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-10-13 10:45:37,863 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56
[2020-10-13 10:45:37,864 INFO  L87              Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 8 states.
[2020-10-13 10:45:38,222 WARN  L193               SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 17
[2020-10-13 10:45:42,999 WARN  L193               SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 24
[2020-10-13 10:45:43,355 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:43,355 INFO  L93              Difference]: Finished difference Result 41 states and 49 transitions.
[2020-10-13 10:45:43,356 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-10-13 10:45:43,356 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 30
[2020-10-13 10:45:43,356 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:43,357 INFO  L225             Difference]: With dead ends: 41
[2020-10-13 10:45:43,357 INFO  L226             Difference]: Without dead ends: 36
[2020-10-13 10:45:43,358 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=49, Invalid=82, Unknown=1, NotChecked=0, Total=132
[2020-10-13 10:45:43,358 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2020-10-13 10:45:43,363 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33.
[2020-10-13 10:45:43,363 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 33 states.
[2020-10-13 10:45:43,364 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions.
[2020-10-13 10:45:43,364 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 30
[2020-10-13 10:45:43,364 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:43,364 INFO  L479      AbstractCegarLoop]: Abstraction has 33 states and 39 transitions.
[2020-10-13 10:45:43,365 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-10-13 10:45:43,365 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions.
[2020-10-13 10:45:43,365 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 33
[2020-10-13 10:45:43,366 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:43,366 INFO  L422         BasicCegarLoop]: trace histogram [11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:43,366 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11
[2020-10-13 10:45:43,366 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:43,366 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:43,366 INFO  L82        PathProgramCache]: Analyzing trace with hash -1804868725, now seen corresponding path program 10 times
[2020-10-13 10:45:43,367 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:43,367 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000089619]
[2020-10-13 10:45:43,367 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:43,375 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:43,379 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:43,401 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:44,197 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:44,197 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 40
[2020-10-13 10:45:44,198 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:44,199 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 821
[2020-10-13 10:45:44,199 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:44,200 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 7
[2020-10-13 10:45:44,200 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:45:44,200 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 13
[2020-10-13 10:45:44,200 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:44,306 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:44,306 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:44,307 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:44,309 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:44,309 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:44,309 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:44,309 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-10-13 10:45:44,310 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:44,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:44,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:44,310 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:44,310 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:44,313 INFO  L134       CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked.
[2020-10-13 10:45:44,313 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000089619]
[2020-10-13 10:45:44,313 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:44,314 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2020-10-13 10:45:44,314 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635232987]
[2020-10-13 10:45:44,315 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-10-13 10:45:44,316 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:44,316 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-10-13 10:45:44,319 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56
[2020-10-13 10:45:44,320 INFO  L87              Difference]: Start difference. First operand 33 states and 39 transitions. Second operand 8 states.
[2020-10-13 10:45:44,402 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:45:44,402 INFO  L93              Difference]: Finished difference Result 53 states and 66 transitions.
[2020-10-13 10:45:44,403 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-10-13 10:45:44,403 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 32
[2020-10-13 10:45:44,404 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:45:44,404 INFO  L225             Difference]: With dead ends: 53
[2020-10-13 10:45:44,404 INFO  L226             Difference]: Without dead ends: 35
[2020-10-13 10:45:44,405 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56
[2020-10-13 10:45:44,405 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2020-10-13 10:45:44,411 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35.
[2020-10-13 10:45:44,411 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 35 states.
[2020-10-13 10:45:44,411 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions.
[2020-10-13 10:45:44,412 INFO  L78                 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 32
[2020-10-13 10:45:44,412 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:45:44,412 INFO  L479      AbstractCegarLoop]: Abstraction has 35 states and 41 transitions.
[2020-10-13 10:45:44,412 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-10-13 10:45:44,412 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions.
[2020-10-13 10:45:44,415 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 35
[2020-10-13 10:45:44,415 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:45:44,416 INFO  L422         BasicCegarLoop]: trace histogram [12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:45:44,416 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12
[2020-10-13 10:45:44,416 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:45:44,416 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:45:44,416 INFO  L82        PathProgramCache]: Analyzing trace with hash -480289400, now seen corresponding path program 11 times
[2020-10-13 10:45:44,416 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:45:44,417 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153082250]
[2020-10-13 10:45:44,417 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:45:44,426 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:44,443 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:44,468 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:45,469 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:45,470 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 42
[2020-10-13 10:45:45,470 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:45:45,470 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1043
[2020-10-13 10:45:45,471 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:45,471 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 8
[2020-10-13 10:45:45,471 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 22
[2020-10-13 10:45:45,471 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 14
[2020-10-13 10:45:45,471 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:45:45,999 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:45:46,000 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:45:46,001 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:45:46,001 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:45:46,002 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:45:46,002 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:45:46,002 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:45:46,003 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:45:46,003 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:45:46,003 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:45:46,004 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:45:46,004 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:45:46,010 INFO  L134       CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked.
[2020-10-13 10:45:46,010 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153082250]
[2020-10-13 10:45:46,010 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:45:46,011 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-10-13 10:45:46,011 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499330052]
[2020-10-13 10:45:46,011 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-10-13 10:45:46,012 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:45:46,012 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-10-13 10:45:46,012 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72
[2020-10-13 10:45:46,013 INFO  L87              Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 9 states.
[2020-10-13 10:45:46,273 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 19
[2020-10-13 10:45:46,524 WARN  L193               SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 19
[2020-10-13 10:46:00,714 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:00,715 INFO  L93              Difference]: Finished difference Result 47 states and 57 transitions.
[2020-10-13 10:46:00,715 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-10-13 10:46:00,715 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 34
[2020-10-13 10:46:00,715 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:00,716 INFO  L225             Difference]: With dead ends: 47
[2020-10-13 10:46:00,716 INFO  L226             Difference]: Without dead ends: 42
[2020-10-13 10:46:00,717 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210
[2020-10-13 10:46:00,718 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 42 states.
[2020-10-13 10:46:00,724 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37.
[2020-10-13 10:46:00,725 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 37 states.
[2020-10-13 10:46:00,725 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions.
[2020-10-13 10:46:00,725 INFO  L78                 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 34
[2020-10-13 10:46:00,726 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:00,726 INFO  L479      AbstractCegarLoop]: Abstraction has 37 states and 44 transitions.
[2020-10-13 10:46:00,726 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-10-13 10:46:00,726 INFO  L276                IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions.
[2020-10-13 10:46:00,727 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 37
[2020-10-13 10:46:00,727 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:00,727 INFO  L422         BasicCegarLoop]: trace histogram [13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:00,727 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13
[2020-10-13 10:46:00,727 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:00,727 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:00,728 INFO  L82        PathProgramCache]: Analyzing trace with hash -864022397, now seen corresponding path program 12 times
[2020-10-13 10:46:00,728 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:00,728 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362320512]
[2020-10-13 10:46:00,728 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:00,736 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:00,741 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:00,768 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:01,809 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:01,809 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 44
[2020-10-13 10:46:01,809 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1072
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 8
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 15
[2020-10-13 10:46:01,810 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:01,914 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:01,914 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:01,915 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:01,917 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:01,917 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:01,918 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:01,919 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:01,921 INFO  L134       CoverageAnalysis]: Checked inductivity of 169 backedges. 91 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked.
[2020-10-13 10:46:01,921 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362320512]
[2020-10-13 10:46:01,921 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:01,922 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-10-13 10:46:01,922 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592650097]
[2020-10-13 10:46:01,922 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-10-13 10:46:01,922 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:01,923 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-10-13 10:46:01,923 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72
[2020-10-13 10:46:01,924 INFO  L87              Difference]: Start difference. First operand 37 states and 44 transitions. Second operand 9 states.
[2020-10-13 10:46:02,004 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:02,005 INFO  L93              Difference]: Finished difference Result 59 states and 74 transitions.
[2020-10-13 10:46:02,005 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-10-13 10:46:02,005 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 36
[2020-10-13 10:46:02,006 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:02,006 INFO  L225             Difference]: With dead ends: 59
[2020-10-13 10:46:02,006 INFO  L226             Difference]: Without dead ends: 39
[2020-10-13 10:46:02,007 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72
[2020-10-13 10:46:02,009 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 39 states.
[2020-10-13 10:46:02,016 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39.
[2020-10-13 10:46:02,016 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 39 states.
[2020-10-13 10:46:02,016 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions.
[2020-10-13 10:46:02,017 INFO  L78                 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 36
[2020-10-13 10:46:02,017 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:02,017 INFO  L479      AbstractCegarLoop]: Abstraction has 39 states and 46 transitions.
[2020-10-13 10:46:02,017 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-10-13 10:46:02,017 INFO  L276                IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions.
[2020-10-13 10:46:02,018 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 39
[2020-10-13 10:46:02,018 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:02,018 INFO  L422         BasicCegarLoop]: trace histogram [14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:02,018 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14
[2020-10-13 10:46:02,019 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:02,019 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:02,019 INFO  L82        PathProgramCache]: Analyzing trace with hash 553403392, now seen corresponding path program 13 times
[2020-10-13 10:46:02,019 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:02,019 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409261245]
[2020-10-13 10:46:02,019 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:02,026 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:02,030 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:02,062 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:03,199 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:03,200 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 46
[2020-10-13 10:46:03,200 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:03,200 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1172
[2020-10-13 10:46:03,200 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:03,201 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 9
[2020-10-13 10:46:03,201 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 24
[2020-10-13 10:46:03,201 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 16
[2020-10-13 10:46:03,201 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:03,445 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:03,445 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:03,446 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:03,447 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:03,447 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:03,447 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:03,447 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:46:03,447 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:03,448 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:03,448 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:03,448 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:03,448 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:03,452 INFO  L134       CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 49 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked.
[2020-10-13 10:46:03,452 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409261245]
[2020-10-13 10:46:03,452 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:03,453 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-10-13 10:46:03,453 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976353024]
[2020-10-13 10:46:03,453 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-10-13 10:46:03,453 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:03,454 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-10-13 10:46:03,454 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90
[2020-10-13 10:46:03,454 INFO  L87              Difference]: Start difference. First operand 39 states and 46 transitions. Second operand 10 states.
[2020-10-13 10:46:23,912 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:23,913 INFO  L93              Difference]: Finished difference Result 50 states and 60 transitions.
[2020-10-13 10:46:23,915 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-10-13 10:46:23,915 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 38
[2020-10-13 10:46:23,916 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:23,916 INFO  L225             Difference]: With dead ends: 50
[2020-10-13 10:46:23,916 INFO  L226             Difference]: Without dead ends: 45
[2020-10-13 10:46:23,917 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=99, Invalid=171, Unknown=2, NotChecked=0, Total=272
[2020-10-13 10:46:23,918 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 45 states.
[2020-10-13 10:46:23,923 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41.
[2020-10-13 10:46:23,924 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 41 states.
[2020-10-13 10:46:23,924 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions.
[2020-10-13 10:46:23,925 INFO  L78                 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 38
[2020-10-13 10:46:23,925 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:23,925 INFO  L479      AbstractCegarLoop]: Abstraction has 41 states and 49 transitions.
[2020-10-13 10:46:23,925 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-10-13 10:46:23,925 INFO  L276                IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions.
[2020-10-13 10:46:23,926 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 41
[2020-10-13 10:46:23,926 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:23,926 INFO  L422         BasicCegarLoop]: trace histogram [15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:23,926 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15
[2020-10-13 10:46:23,926 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:23,926 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:23,927 INFO  L82        PathProgramCache]: Analyzing trace with hash 377305339, now seen corresponding path program 14 times
[2020-10-13 10:46:23,927 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:23,927 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141903236]
[2020-10-13 10:46:23,927 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:23,933 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:23,937 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:23,968 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:25,109 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 48
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1175
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 9
[2020-10-13 10:46:25,110 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:46:25,111 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 17
[2020-10-13 10:46:25,111 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:25,227 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:25,228 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:25,229 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:25,229 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:25,230 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:25,230 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:25,230 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:46:25,230 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:25,230 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:25,231 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:25,231 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:25,231 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:25,234 INFO  L134       CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 56 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked.
[2020-10-13 10:46:25,234 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141903236]
[2020-10-13 10:46:25,234 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:25,234 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-10-13 10:46:25,235 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636944016]
[2020-10-13 10:46:25,236 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-10-13 10:46:25,236 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:25,237 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-10-13 10:46:25,237 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90
[2020-10-13 10:46:25,237 INFO  L87              Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 10 states.
[2020-10-13 10:46:25,338 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:25,338 INFO  L93              Difference]: Finished difference Result 65 states and 82 transitions.
[2020-10-13 10:46:25,338 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-10-13 10:46:25,339 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 40
[2020-10-13 10:46:25,339 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:25,339 INFO  L225             Difference]: With dead ends: 65
[2020-10-13 10:46:25,339 INFO  L226             Difference]: Without dead ends: 43
[2020-10-13 10:46:25,340 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90
[2020-10-13 10:46:25,341 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 43 states.
[2020-10-13 10:46:25,348 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43.
[2020-10-13 10:46:25,348 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 43 states.
[2020-10-13 10:46:25,349 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions.
[2020-10-13 10:46:25,349 INFO  L78                 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 40
[2020-10-13 10:46:25,349 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:25,349 INFO  L479      AbstractCegarLoop]: Abstraction has 43 states and 51 transitions.
[2020-10-13 10:46:25,349 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-10-13 10:46:25,350 INFO  L276                IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions.
[2020-10-13 10:46:25,350 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 43
[2020-10-13 10:46:25,350 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:25,350 INFO  L422         BasicCegarLoop]: trace histogram [16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:25,351 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16
[2020-10-13 10:46:25,351 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:25,351 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:25,351 INFO  L82        PathProgramCache]: Analyzing trace with hash -1568053768, now seen corresponding path program 15 times
[2020-10-13 10:46:25,351 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:25,352 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323692001]
[2020-10-13 10:46:25,352 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:25,358 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:25,361 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:25,395 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:26,890 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:26,890 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 50
[2020-10-13 10:46:26,890 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1531
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 10
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 26
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 18
[2020-10-13 10:46:26,891 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:27,133 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:27,134 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:27,135 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:27,135 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:27,135 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:27,136 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:27,137 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:27,141 INFO  L134       CoverageAnalysis]: Checked inductivity of 256 backedges. 136 proven. 64 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked.
[2020-10-13 10:46:27,141 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323692001]
[2020-10-13 10:46:27,141 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:27,142 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-10-13 10:46:27,142 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817077537]
[2020-10-13 10:46:27,142 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-10-13 10:46:27,142 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:27,143 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-10-13 10:46:27,143 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-10-13 10:46:27,143 INFO  L87              Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 11 states.
[2020-10-13 10:46:31,544 WARN  L193               SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 47 DAG size of output: 19
[2020-10-13 10:46:33,880 WARN  L193               SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 19
[2020-10-13 10:46:36,047 WARN  L193               SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 47 DAG size of output: 19
[2020-10-13 10:46:44,800 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:44,801 INFO  L93              Difference]: Finished difference Result 53 states and 64 transitions.
[2020-10-13 10:46:44,801 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-10-13 10:46:44,802 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 42
[2020-10-13 10:46:44,802 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:44,802 INFO  L225             Difference]: With dead ends: 53
[2020-10-13 10:46:44,802 INFO  L226             Difference]: Without dead ends: 48
[2020-10-13 10:46:44,803 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=104, Invalid=201, Unknown=1, NotChecked=0, Total=306
[2020-10-13 10:46:44,803 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 48 states.
[2020-10-13 10:46:44,809 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45.
[2020-10-13 10:46:44,810 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 45 states.
[2020-10-13 10:46:44,810 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions.
[2020-10-13 10:46:44,810 INFO  L78                 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 42
[2020-10-13 10:46:44,811 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:44,811 INFO  L479      AbstractCegarLoop]: Abstraction has 45 states and 54 transitions.
[2020-10-13 10:46:44,811 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-10-13 10:46:44,811 INFO  L276                IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions.
[2020-10-13 10:46:44,812 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-10-13 10:46:44,812 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:44,812 INFO  L422         BasicCegarLoop]: trace histogram [17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:44,812 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17
[2020-10-13 10:46:44,812 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:44,812 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:44,813 INFO  L82        PathProgramCache]: Analyzing trace with hash 1766440179, now seen corresponding path program 16 times
[2020-10-13 10:46:44,813 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:44,813 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295988592]
[2020-10-13 10:46:44,813 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:44,819 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:44,823 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:44,853 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:46,736 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:46,736 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 52
[2020-10-13 10:46:46,736 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:46,737 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1916
[2020-10-13 10:46:46,737 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:46,737 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 10
[2020-10-13 10:46:46,738 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:46:46,738 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 19
[2020-10-13 10:46:46,738 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 1
[2020-10-13 10:46:46,883 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:46,884 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:46,884 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:46,885 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:46,885 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:46,885 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:46,885 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:46:46,886 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:46,886 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:46,886 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:46,886 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:46,886 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:46,890 INFO  L134       CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked.
[2020-10-13 10:46:46,890 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295988592]
[2020-10-13 10:46:46,890 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:46,891 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-10-13 10:46:46,891 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990205866]
[2020-10-13 10:46:46,892 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-10-13 10:46:46,892 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:46,893 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-10-13 10:46:46,893 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-10-13 10:46:46,893 INFO  L87              Difference]: Start difference. First operand 45 states and 54 transitions. Second operand 11 states.
[2020-10-13 10:46:47,011 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:46:47,012 INFO  L93              Difference]: Finished difference Result 71 states and 90 transitions.
[2020-10-13 10:46:47,012 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-10-13 10:46:47,012 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 44
[2020-10-13 10:46:47,012 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:46:47,013 INFO  L225             Difference]: With dead ends: 71
[2020-10-13 10:46:47,013 INFO  L226             Difference]: Without dead ends: 47
[2020-10-13 10:46:47,013 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-10-13 10:46:47,014 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 47 states.
[2020-10-13 10:46:47,024 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47.
[2020-10-13 10:46:47,024 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 47 states.
[2020-10-13 10:46:47,025 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions.
[2020-10-13 10:46:47,025 INFO  L78                 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 44
[2020-10-13 10:46:47,025 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:46:47,025 INFO  L479      AbstractCegarLoop]: Abstraction has 47 states and 56 transitions.
[2020-10-13 10:46:47,025 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-10-13 10:46:47,025 INFO  L276                IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions.
[2020-10-13 10:46:47,026 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 47
[2020-10-13 10:46:47,026 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:46:47,026 INFO  L422         BasicCegarLoop]: trace histogram [18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:46:47,026 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18
[2020-10-13 10:46:47,026 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:46:47,027 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:46:47,027 INFO  L82        PathProgramCache]: Analyzing trace with hash -1991433360, now seen corresponding path program 17 times
[2020-10-13 10:46:47,027 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:46:47,027 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654700410]
[2020-10-13 10:46:47,027 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:46:47,037 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:47,045 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:47,088 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 54
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1591
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:48,629 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 11
[2020-10-13 10:46:48,630 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 28
[2020-10-13 10:46:48,630 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 20
[2020-10-13 10:46:48,630 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:55,068 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:46:55,069 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:46:55,069 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:46:55,070 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:46:55,070 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:46:55,070 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:46:55,070 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:46:55,070 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:46:55,071 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:46:55,071 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:46:55,071 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:46:55,071 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:46:55,076 INFO  L134       CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 75 refuted. 6 times theorem prover too weak. 72 trivial. 0 not checked.
[2020-10-13 10:46:55,076 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654700410]
[2020-10-13 10:46:55,076 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:46:55,076 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12
[2020-10-13 10:46:55,077 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747251368]
[2020-10-13 10:46:55,077 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-10-13 10:46:55,077 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:46:55,077 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-10-13 10:46:55,078 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=99, Unknown=3, NotChecked=0, Total=132
[2020-10-13 10:46:55,078 INFO  L87              Difference]: Start difference. First operand 47 states and 56 transitions. Second operand 12 states.
[2020-10-13 10:46:56,282 WARN  L193               SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:46:58,765 WARN  L193               SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 17
[2020-10-13 10:47:05,194 WARN  L193               SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 45 DAG size of output: 17
[2020-10-13 10:47:07,531 WARN  L193               SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17
[2020-10-13 10:47:12,063 WARN  L193               SmtUtils]: Spent 2.29 s on a formula simplification. DAG size of input: 38 DAG size of output: 17
[2020-10-13 10:47:19,077 WARN  L193               SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 24 DAG size of output: 17
[2020-10-13 10:47:24,018 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:47:24,018 INFO  L93              Difference]: Finished difference Result 57 states and 69 transitions.
[2020-10-13 10:47:24,024 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-10-13 10:47:24,024 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 46
[2020-10-13 10:47:24,025 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:47:24,025 INFO  L225             Difference]: With dead ends: 57
[2020-10-13 10:47:24,025 INFO  L226             Difference]: Without dead ends: 52
[2020-10-13 10:47:24,026 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=144, Invalid=270, Unknown=6, NotChecked=0, Total=420
[2020-10-13 10:47:24,026 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 52 states.
[2020-10-13 10:47:24,032 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 49.
[2020-10-13 10:47:24,033 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 49 states.
[2020-10-13 10:47:24,033 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions.
[2020-10-13 10:47:24,033 INFO  L78                 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 46
[2020-10-13 10:47:24,034 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:47:24,034 INFO  L479      AbstractCegarLoop]: Abstraction has 49 states and 59 transitions.
[2020-10-13 10:47:24,034 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-10-13 10:47:24,034 INFO  L276                IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions.
[2020-10-13 10:47:24,034 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 49
[2020-10-13 10:47:24,035 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:47:24,035 INFO  L422         BasicCegarLoop]: trace histogram [19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:47:24,035 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19
[2020-10-13 10:47:24,035 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:47:24,035 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:47:24,035 INFO  L82        PathProgramCache]: Analyzing trace with hash -1374421909, now seen corresponding path program 18 times
[2020-10-13 10:47:24,036 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:47:24,036 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913753439]
[2020-10-13 10:47:24,036 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:47:24,041 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:47:24,045 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:24,107 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:25,337 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:47:25,337 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 56
[2020-10-13 10:47:25,337 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1295
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 11
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 21
[2020-10-13 10:47:25,338 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:47:25,486 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:47:25,487 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:47:25,487 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:25,488 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:47:25,488 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:47:25,488 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:47:25,489 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:47:25,489 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:47:25,489 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:47:25,489 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:47:25,489 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:47:25,490 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:47:25,493 INFO  L134       CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 90 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked.
[2020-10-13 10:47:25,494 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913753439]
[2020-10-13 10:47:25,494 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:47:25,494 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12
[2020-10-13 10:47:25,494 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960506232]
[2020-10-13 10:47:25,495 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-10-13 10:47:25,495 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:47:25,495 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-10-13 10:47:25,495 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132
[2020-10-13 10:47:25,495 INFO  L87              Difference]: Start difference. First operand 49 states and 59 transitions. Second operand 12 states.
[2020-10-13 10:47:25,668 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:47:25,669 INFO  L93              Difference]: Finished difference Result 77 states and 98 transitions.
[2020-10-13 10:47:25,670 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-10-13 10:47:25,670 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 48
[2020-10-13 10:47:25,670 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:47:25,671 INFO  L225             Difference]: With dead ends: 77
[2020-10-13 10:47:25,671 INFO  L226             Difference]: Without dead ends: 51
[2020-10-13 10:47:25,671 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132
[2020-10-13 10:47:25,672 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 51 states.
[2020-10-13 10:47:25,686 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51.
[2020-10-13 10:47:25,686 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 51 states.
[2020-10-13 10:47:25,687 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions.
[2020-10-13 10:47:25,687 INFO  L78                 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 48
[2020-10-13 10:47:25,687 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:47:25,688 INFO  L479      AbstractCegarLoop]: Abstraction has 51 states and 61 transitions.
[2020-10-13 10:47:25,688 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-10-13 10:47:25,688 INFO  L276                IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions.
[2020-10-13 10:47:25,688 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 51
[2020-10-13 10:47:25,689 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:47:25,689 INFO  L422         BasicCegarLoop]: trace histogram [20, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:47:25,689 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20
[2020-10-13 10:47:25,689 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:47:25,689 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:47:25,689 INFO  L82        PathProgramCache]: Analyzing trace with hash -1193943960, now seen corresponding path program 19 times
[2020-10-13 10:47:25,690 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:47:25,690 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791874826]
[2020-10-13 10:47:25,690 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:47:25,699 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:47:25,706 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:25,747 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:27,480 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:47:27,480 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 58
[2020-10-13 10:47:27,480 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:47:27,481 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1779
[2020-10-13 10:47:27,481 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:47:27,481 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 12
[2020-10-13 10:47:27,481 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 30
[2020-10-13 10:47:27,482 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 22
[2020-10-13 10:47:27,482 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:47:36,023 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:47:36,024 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:47:36,024 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:47:36,025 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:47:36,025 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:47:36,025 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:47:36,025 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:47:36,025 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:47:36,026 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:47:36,026 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:47:36,026 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:47:36,026 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:47:36,030 INFO  L134       CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 94 refuted. 6 times theorem prover too weak. 90 trivial. 0 not checked.
[2020-10-13 10:47:36,030 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791874826]
[2020-10-13 10:47:36,030 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:47:36,030 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-10-13 10:47:36,031 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771895076]
[2020-10-13 10:47:36,031 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-10-13 10:47:36,031 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:47:36,031 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-10-13 10:47:36,032 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=120, Unknown=4, NotChecked=0, Total=156
[2020-10-13 10:47:36,032 INFO  L87              Difference]: Start difference. First operand 51 states and 61 transitions. Second operand 13 states.
[2020-10-13 10:47:38,438 WARN  L193               SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:47:41,200 WARN  L193               SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:47:44,018 WARN  L193               SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:47:47,696 WARN  L193               SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17
[2020-10-13 10:47:52,574 WARN  L193               SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:47:56,726 WARN  L193               SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 52 DAG size of output: 17
[2020-10-13 10:48:06,388 WARN  L193               SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17
[2020-10-13 10:48:07,140 WARN  L193               SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 17
[2020-10-13 10:48:22,754 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:48:22,755 INFO  L93              Difference]: Finished difference Result 66 states and 81 transitions.
[2020-10-13 10:48:22,757 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2020-10-13 10:48:22,757 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 50
[2020-10-13 10:48:22,757 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:48:22,758 INFO  L225             Difference]: With dead ends: 66
[2020-10-13 10:48:22,758 INFO  L226             Difference]: Without dead ends: 61
[2020-10-13 10:48:22,759 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=198, Invalid=395, Unknown=7, NotChecked=0, Total=600
[2020-10-13 10:48:22,759 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 61 states.
[2020-10-13 10:48:22,766 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53.
[2020-10-13 10:48:22,766 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 53 states.
[2020-10-13 10:48:22,767 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions.
[2020-10-13 10:48:22,767 INFO  L78                 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 50
[2020-10-13 10:48:22,767 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:48:22,767 INFO  L479      AbstractCegarLoop]: Abstraction has 53 states and 64 transitions.
[2020-10-13 10:48:22,767 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-10-13 10:48:22,767 INFO  L276                IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions.
[2020-10-13 10:48:22,768 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 53
[2020-10-13 10:48:22,768 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:48:22,768 INFO  L422         BasicCegarLoop]: trace histogram [21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:48:22,769 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21
[2020-10-13 10:48:22,769 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:48:22,769 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:48:22,769 INFO  L82        PathProgramCache]: Analyzing trace with hash 508712803, now seen corresponding path program 20 times
[2020-10-13 10:48:22,769 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:48:22,769 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913554610]
[2020-10-13 10:48:22,770 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:48:22,779 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:48:22,786 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:22,818 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:25,013 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 60
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2233
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 12
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 10
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 23
[2020-10-13 10:48:25,014 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:48:25,181 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:48:25,182 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:48:25,182 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:25,183 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:48:25,183 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:48:25,184 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:48:25,184 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 1
[2020-10-13 10:48:25,184 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:48:25,184 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:48:25,184 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:48:25,185 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:48:25,185 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:48:25,188 INFO  L134       CoverageAnalysis]: Checked inductivity of 441 backedges. 231 proven. 110 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked.
[2020-10-13 10:48:25,188 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913554610]
[2020-10-13 10:48:25,189 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:48:25,189 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-10-13 10:48:25,189 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366397631]
[2020-10-13 10:48:25,189 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-10-13 10:48:25,189 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:48:25,189 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-10-13 10:48:25,190 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156
[2020-10-13 10:48:25,190 INFO  L87              Difference]: Start difference. First operand 53 states and 64 transitions. Second operand 13 states.
[2020-10-13 10:48:25,378 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-13 10:48:25,378 INFO  L93              Difference]: Finished difference Result 83 states and 106 transitions.
[2020-10-13 10:48:25,380 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-10-13 10:48:25,380 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 52
[2020-10-13 10:48:25,380 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-13 10:48:25,381 INFO  L225             Difference]: With dead ends: 83
[2020-10-13 10:48:25,381 INFO  L226             Difference]: Without dead ends: 55
[2020-10-13 10:48:25,381 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156
[2020-10-13 10:48:25,382 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-10-13 10:48:25,388 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55.
[2020-10-13 10:48:25,388 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55 states.
[2020-10-13 10:48:25,388 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions.
[2020-10-13 10:48:25,389 INFO  L78                 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 52
[2020-10-13 10:48:25,389 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-13 10:48:25,389 INFO  L479      AbstractCegarLoop]: Abstraction has 55 states and 66 transitions.
[2020-10-13 10:48:25,389 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-10-13 10:48:25,389 INFO  L276                IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions.
[2020-10-13 10:48:25,390 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 55
[2020-10-13 10:48:25,390 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-13 10:48:25,390 INFO  L422         BasicCegarLoop]: trace histogram [22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-13 10:48:25,390 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22
[2020-10-13 10:48:25,390 INFO  L427      AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-13 10:48:25,390 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-13 10:48:25,390 INFO  L82        PathProgramCache]: Analyzing trace with hash 888795360, now seen corresponding path program 21 times
[2020-10-13 10:48:25,391 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-13 10:48:25,391 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155434513]
[2020-10-13 10:48:25,391 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-13 10:48:25,400 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:48:25,405 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:25,443 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:27,637 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:48:27,637 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 62
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 2
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 2237
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 13
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 32
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 24
[2020-10-13 10:48:27,638 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:48:34,166 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-13 10:48:34,167 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-13 10:48:34,167 FATAL L256   erpolLogProxyWrapper]: Now shrinking...
[2020-10-13 10:48:34,168 FATAL L256   erpolLogProxyWrapper]: Timeout: 5000
[2020-10-13 10:48:34,168 FATAL L256   erpolLogProxyWrapper]: Cardinality of Constraint set: 7
[2020-10-13 10:48:34,168 FATAL L256   erpolLogProxyWrapper]: Number of enumerated Muses: 1
[2020-10-13 10:48:34,168 FATAL L256   erpolLogProxyWrapper]: Time needed for enumeration: 0
[2020-10-13 10:48:34,168 FATAL L256   erpolLogProxyWrapper]: Heuristic: NARROWEST
[2020-10-13 10:48:34,169 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has size: 1
[2020-10-13 10:48:34,169 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has depth: 1
[2020-10-13 10:48:34,169 FATAL L256   erpolLogProxyWrapper]: Chosen Mus has width: 1
[2020-10-13 10:48:34,169 FATAL L256   erpolLogProxyWrapper]: Time needed for Heuristics: 0
[2020-10-13 10:48:34,173 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 115 refuted. 6 times theorem prover too weak. 110 trivial. 0 not checked.
[2020-10-13 10:48:34,173 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155434513]
[2020-10-13 10:48:34,173 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-10-13 10:48:34,174 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14
[2020-10-13 10:48:34,174 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995850156]
[2020-10-13 10:48:34,174 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-10-13 10:48:34,174 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-13 10:48:34,175 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-10-13 10:48:34,175 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=143, Unknown=3, NotChecked=0, Total=182
[2020-10-13 10:48:34,175 INFO  L87              Difference]: Start difference. First operand 55 states and 66 transitions. Second operand 14 states.
[2020-10-13 10:48:37,424 WARN  L193               SmtUtils]: Spent 736.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 17
[2020-10-13 10:48:41,484 WARN  L193               SmtUtils]: Spent 3.34 s on a formula simplification. DAG size of input: 80 DAG size of output: 17
[2020-10-13 10:48:42,410 WARN  L193               SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17
[2020-10-13 10:48:51,116 WARN  L193               SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17
[2020-10-13 10:48:55,875 WARN  L193               SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 17
[2020-10-13 10:48:58,692 WARN  L193               SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 17
[2020-10-13 10:49:47,868 WARN  L193               SmtUtils]: Spent 2.48 s on a formula simplification. DAG size of input: 73 DAG size of output: 17