/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 18:49:18,259 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 18:49:18,262 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 18:49:18,309 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 18:49:18,309 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 18:49:18,310 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 18:49:18,311 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 18:49:18,313 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 18:49:18,315 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 18:49:18,316 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 18:49:18,317 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 18:49:18,318 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 18:49:18,318 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 18:49:18,319 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 18:49:18,320 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 18:49:18,321 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 18:49:18,322 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 18:49:18,323 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 18:49:18,325 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 18:49:18,327 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 18:49:18,329 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 18:49:18,330 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 18:49:18,331 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 18:49:18,332 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 18:49:18,334 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 18:49:18,334 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 18:49:18,335 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 18:49:18,336 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 18:49:18,336 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 18:49:18,337 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 18:49:18,337 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 18:49:18,338 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 18:49:18,339 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 18:49:18,339 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 18:49:18,340 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 18:49:18,341 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-08-18 18:49:18,342 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 18:49:18,343 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 18:49:18,344 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 18:49:18,366 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 18:49:18,367 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 18:49:18,368 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 18:49:18,368 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 18:49:18,368 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 18:49:18,369 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 18:49:18,369 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 18:49:18,369 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 18:49:18,369 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 18:49:18,369 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 18:49:18,370 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 18:49:18,370 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 18:49:18,370 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 18:49:18,370 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 18:49:18,370 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 18:49:18,371 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 18:49:18,371 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 18:49:18,371 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 18:49:18,371 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 18:49:18,371 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 18:49:18,372 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 18:49:18,372 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 18:49:18,372 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 18:49:18,372 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 18:49:18,372 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 18:49:18,373 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 18:49:18,373 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 18:49:18,373 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 18:49:18,373 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 18:49:18,373 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER;
[2020-08-18 18:49:18,706 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 18:49:18,727 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 18:49:18,733 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 18:49:18,735 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 18:49:18,736 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 18:49:18,738 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i
[2020-08-18 18:49:18,802 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d04c5141/6bbf8115866d4e03814a209903ff79f6/FLAG6edf7d23a
[2020-08-18 18:49:19,229 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 18:49:19,230 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-invgen/fragtest_simple.i
[2020-08-18 18:49:19,236 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d04c5141/6bbf8115866d4e03814a209903ff79f6/FLAG6edf7d23a
[2020-08-18 18:49:19,592 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d04c5141/6bbf8115866d4e03814a209903ff79f6
[2020-08-18 18:49:19,604 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 18:49:19,606 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 18:49:19,607 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 18:49:19,607 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 18:49:19,611 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 18:49:19,612 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,615 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d198e76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19, skipping insertion in model container
[2020-08-18 18:49:19,616 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,624 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 18:49:19,647 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 18:49:19,814 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:49:19,820 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 18:49:19,852 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:49:19,868 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 18:49:19,868 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19 WrapperNode
[2020-08-18 18:49:19,868 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 18:49:19,869 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 18:49:19,869 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 18:49:19,869 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 18:49:19,879 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,880 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,885 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,886 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,895 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,975 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,977 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
[2020-08-18 18:49:19,979 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 18:49:19,980 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 18:49:19,980 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 18:49:19,980 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 18:49:19,981 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 18:49:20,047 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 18:49:20,048 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 18:49:20,048 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 18:49:20,048 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-08-18 18:49:20,048 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 18:49:20,048 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 18:49:20,048 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 18:49:20,049 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 18:49:20,258 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 18:49:20,258 INFO  L295             CfgBuilder]: Removed 3 assume(true) statements.
[2020-08-18 18:49:20,262 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:20 BoogieIcfgContainer
[2020-08-18 18:49:20,262 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 18:49:20,263 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 18:49:20,264 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 18:49:20,267 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 18:49:20,267 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:49:19" (1/3) ...
[2020-08-18 18:49:20,268 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3180e936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:20, skipping insertion in model container
[2020-08-18 18:49:20,268 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:19" (2/3) ...
[2020-08-18 18:49:20,269 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3180e936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:20, skipping insertion in model container
[2020-08-18 18:49:20,269 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:20" (3/3) ...
[2020-08-18 18:49:20,271 INFO  L109   eAbstractionObserver]: Analyzing ICFG fragtest_simple.i
[2020-08-18 18:49:20,281 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 18:49:20,289 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 18:49:20,304 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 18:49:20,327 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 18:49:20,327 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 18:49:20,328 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 18:49:20,328 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 18:49:20,328 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 18:49:20,328 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 18:49:20,328 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 18:49:20,328 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 18:49:20,347 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states.
[2020-08-18 18:49:20,352 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2020-08-18 18:49:20,352 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:20,353 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:20,354 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:20,359 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:20,359 INFO  L82        PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times
[2020-08-18 18:49:20,366 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,366 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074630979]
[2020-08-18 18:49:20,367 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:20,444 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,472 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:20,473 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,479 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:49:20,479 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074630979]
[2020-08-18 18:49:20,481 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:49:20,482 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2020-08-18 18:49:20,482 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617088701]
[2020-08-18 18:49:20,487 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 2 states
[2020-08-18 18:49:20,487 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,497 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2020-08-18 18:49:20,498 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-08-18 18:49:20,500 INFO  L87              Difference]: Start difference. First operand 27 states. Second operand 2 states.
[2020-08-18 18:49:20,521 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:20,522 INFO  L93              Difference]: Finished difference Result 47 states and 62 transitions.
[2020-08-18 18:49:20,522 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2020-08-18 18:49:20,523 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 15
[2020-08-18 18:49:20,524 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:20,532 INFO  L225             Difference]: With dead ends: 47
[2020-08-18 18:49:20,532 INFO  L226             Difference]: Without dead ends: 22
[2020-08-18 18:49:20,536 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-08-18 18:49:20,550 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2020-08-18 18:49:20,567 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22.
[2020-08-18 18:49:20,568 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22 states.
[2020-08-18 18:49:20,571 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions.
[2020-08-18 18:49:20,573 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15
[2020-08-18 18:49:20,573 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:20,574 INFO  L479      AbstractCegarLoop]: Abstraction has 22 states and 25 transitions.
[2020-08-18 18:49:20,574 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2020-08-18 18:49:20,574 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions.
[2020-08-18 18:49:20,575 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2020-08-18 18:49:20,575 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:20,575 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:20,576 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 18:49:20,576 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:20,576 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:20,577 INFO  L82        PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times
[2020-08-18 18:49:20,577 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,577 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815742048]
[2020-08-18 18:49:20,577 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:20,608 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,713 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:20,715 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,725 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:49:20,725 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815742048]
[2020-08-18 18:49:20,726 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:49:20,726 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 18:49:20,730 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325947026]
[2020-08-18 18:49:20,732 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 18:49:20,733 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,733 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 18:49:20,734 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 18:49:20,734 INFO  L87              Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states.
[2020-08-18 18:49:20,831 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:20,832 INFO  L93              Difference]: Finished difference Result 31 states and 34 transitions.
[2020-08-18 18:49:20,832 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 18:49:20,833 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 17
[2020-08-18 18:49:20,833 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:20,834 INFO  L225             Difference]: With dead ends: 31
[2020-08-18 18:49:20,834 INFO  L226             Difference]: Without dead ends: 29
[2020-08-18 18:49:20,836 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 18:49:20,837 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 29 states.
[2020-08-18 18:49:20,844 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28.
[2020-08-18 18:49:20,844 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28 states.
[2020-08-18 18:49:20,846 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions.
[2020-08-18 18:49:20,846 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17
[2020-08-18 18:49:20,846 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:20,847 INFO  L479      AbstractCegarLoop]: Abstraction has 28 states and 31 transitions.
[2020-08-18 18:49:20,847 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 18:49:20,847 INFO  L276                IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions.
[2020-08-18 18:49:20,848 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-08-18 18:49:20,848 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:20,849 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:20,849 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 18:49:20,849 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:20,849 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:20,850 INFO  L82        PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times
[2020-08-18 18:49:20,850 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,851 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36517021]
[2020-08-18 18:49:20,851 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:20,900 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,982 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:20,983 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,985 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13
[2020-08-18 18:49:20,988 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:20,996 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:49:20,997 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36517021]
[2020-08-18 18:49:20,997 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:49:20,997 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 18:49:20,997 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318535358]
[2020-08-18 18:49:20,998 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 18:49:20,998 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:20,999 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 18:49:20,999 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20
[2020-08-18 18:49:20,999 INFO  L87              Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states.
[2020-08-18 18:49:21,095 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:21,095 INFO  L93              Difference]: Finished difference Result 49 states and 56 transitions.
[2020-08-18 18:49:21,096 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 18:49:21,097 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 25
[2020-08-18 18:49:21,097 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:21,100 INFO  L225             Difference]: With dead ends: 49
[2020-08-18 18:49:21,100 INFO  L226             Difference]: Without dead ends: 34
[2020-08-18 18:49:21,101 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2020-08-18 18:49:21,102 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2020-08-18 18:49:21,112 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30.
[2020-08-18 18:49:21,112 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30 states.
[2020-08-18 18:49:21,113 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions.
[2020-08-18 18:49:21,114 INFO  L78                 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25
[2020-08-18 18:49:21,114 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:21,114 INFO  L479      AbstractCegarLoop]: Abstraction has 30 states and 33 transitions.
[2020-08-18 18:49:21,114 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 18:49:21,115 INFO  L276                IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions.
[2020-08-18 18:49:21,115 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-08-18 18:49:21,116 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:21,116 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:21,116 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 18:49:21,117 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:21,117 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:21,117 INFO  L82        PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times
[2020-08-18 18:49:21,117 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,118 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858241242]
[2020-08-18 18:49:21,118 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:21,133 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,180 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:21,181 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,183 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-08-18 18:49:21,186 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,192 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:49:21,193 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858241242]
[2020-08-18 18:49:21,193 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:21,193 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6
[2020-08-18 18:49:21,193 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931067305]
[2020-08-18 18:49:21,194 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-18 18:49:21,194 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,195 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-18 18:49:21,195 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 18:49:21,195 INFO  L87              Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 6 states.
[2020-08-18 18:49:21,315 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:21,315 INFO  L93              Difference]: Finished difference Result 55 states and 64 transitions.
[2020-08-18 18:49:21,316 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 18:49:21,316 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 27
[2020-08-18 18:49:21,316 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:21,318 INFO  L225             Difference]: With dead ends: 55
[2020-08-18 18:49:21,318 INFO  L226             Difference]: Without dead ends: 40
[2020-08-18 18:49:21,319 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56
[2020-08-18 18:49:21,319 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 40 states.
[2020-08-18 18:49:21,326 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32.
[2020-08-18 18:49:21,326 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 32 states.
[2020-08-18 18:49:21,327 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions.
[2020-08-18 18:49:21,328 INFO  L78                 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27
[2020-08-18 18:49:21,328 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:21,328 INFO  L479      AbstractCegarLoop]: Abstraction has 32 states and 35 transitions.
[2020-08-18 18:49:21,328 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-18 18:49:21,328 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions.
[2020-08-18 18:49:21,329 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 30
[2020-08-18 18:49:21,330 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:21,330 INFO  L422         BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:21,330 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 18:49:21,330 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:21,331 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:21,331 INFO  L82        PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times
[2020-08-18 18:49:21,331 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,332 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96213631]
[2020-08-18 18:49:21,332 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:21,350 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,459 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:21,460 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,463 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 18:49:21,472 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,485 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:49:21,486 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96213631]
[2020-08-18 18:49:21,486 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:21,486 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-08-18 18:49:21,491 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274341826]
[2020-08-18 18:49:21,491 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-08-18 18:49:21,492 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,492 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-08-18 18:49:21,493 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42
[2020-08-18 18:49:21,493 INFO  L87              Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 7 states.
[2020-08-18 18:49:21,581 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:21,582 INFO  L93              Difference]: Finished difference Result 47 states and 51 transitions.
[2020-08-18 18:49:21,582 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-08-18 18:49:21,582 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 29
[2020-08-18 18:49:21,583 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:21,584 INFO  L225             Difference]: With dead ends: 47
[2020-08-18 18:49:21,584 INFO  L226             Difference]: Without dead ends: 45
[2020-08-18 18:49:21,585 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56
[2020-08-18 18:49:21,585 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 45 states.
[2020-08-18 18:49:21,592 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44.
[2020-08-18 18:49:21,592 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 44 states.
[2020-08-18 18:49:21,593 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions.
[2020-08-18 18:49:21,594 INFO  L78                 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29
[2020-08-18 18:49:21,594 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:21,594 INFO  L479      AbstractCegarLoop]: Abstraction has 44 states and 48 transitions.
[2020-08-18 18:49:21,594 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-08-18 18:49:21,595 INFO  L276                IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions.
[2020-08-18 18:49:21,597 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 46
[2020-08-18 18:49:21,597 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:21,597 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:21,597 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 18:49:21,598 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:21,598 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:21,598 INFO  L82        PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times
[2020-08-18 18:49:21,598 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,599 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397999540]
[2020-08-18 18:49:21,599 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:21,625 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,699 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:21,700 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,701 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 18:49:21,703 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,706 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 18:49:21,708 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,711 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33
[2020-08-18 18:49:21,713 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,719 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 24 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 18:49:21,720 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397999540]
[2020-08-18 18:49:21,720 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:21,720 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-18 18:49:21,721 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862316714]
[2020-08-18 18:49:21,721 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-18 18:49:21,722 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,722 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-18 18:49:21,722 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72
[2020-08-18 18:49:21,722 INFO  L87              Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 9 states.
[2020-08-18 18:49:21,843 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:21,843 INFO  L93              Difference]: Finished difference Result 83 states and 96 transitions.
[2020-08-18 18:49:21,844 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-08-18 18:49:21,844 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 45
[2020-08-18 18:49:21,844 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:21,846 INFO  L225             Difference]: With dead ends: 83
[2020-08-18 18:49:21,846 INFO  L226             Difference]: Without dead ends: 58
[2020-08-18 18:49:21,847 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132
[2020-08-18 18:49:21,848 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 58 states.
[2020-08-18 18:49:21,854 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46.
[2020-08-18 18:49:21,855 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 46 states.
[2020-08-18 18:49:21,856 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions.
[2020-08-18 18:49:21,856 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45
[2020-08-18 18:49:21,856 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:21,856 INFO  L479      AbstractCegarLoop]: Abstraction has 46 states and 50 transitions.
[2020-08-18 18:49:21,857 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-18 18:49:21,857 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions.
[2020-08-18 18:49:21,858 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 48
[2020-08-18 18:49:21,858 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:21,858 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:21,859 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 18:49:21,859 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:21,859 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:21,859 INFO  L82        PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times
[2020-08-18 18:49:21,859 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,860 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105249521]
[2020-08-18 18:49:21,860 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:21,877 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,961 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:21,962 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,963 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19
[2020-08-18 18:49:21,966 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,968 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27
[2020-08-18 18:49:21,970 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,973 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-08-18 18:49:21,975 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:21,981 INFO  L134       CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 18:49:21,981 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105249521]
[2020-08-18 18:49:21,981 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:21,982 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-08-18 18:49:21,982 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291921174]
[2020-08-18 18:49:21,982 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-08-18 18:49:21,983 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:21,983 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-08-18 18:49:21,983 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90
[2020-08-18 18:49:21,983 INFO  L87              Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 10 states.
[2020-08-18 18:49:22,129 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:22,129 INFO  L93              Difference]: Finished difference Result 87 states and 103 transitions.
[2020-08-18 18:49:22,129 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 18:49:22,129 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 47
[2020-08-18 18:49:22,130 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:22,131 INFO  L225             Difference]: With dead ends: 87
[2020-08-18 18:49:22,131 INFO  L226             Difference]: Without dead ends: 64
[2020-08-18 18:49:22,132 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182
[2020-08-18 18:49:22,132 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 64 states.
[2020-08-18 18:49:22,138 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48.
[2020-08-18 18:49:22,138 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 48 states.
[2020-08-18 18:49:22,139 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions.
[2020-08-18 18:49:22,139 INFO  L78                 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47
[2020-08-18 18:49:22,139 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:22,140 INFO  L479      AbstractCegarLoop]: Abstraction has 48 states and 52 transitions.
[2020-08-18 18:49:22,140 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-08-18 18:49:22,140 INFO  L276                IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions.
[2020-08-18 18:49:22,141 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 50
[2020-08-18 18:49:22,141 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:22,141 INFO  L422         BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:22,141 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-08-18 18:49:22,142 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:22,142 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:22,142 INFO  L82        PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times
[2020-08-18 18:49:22,142 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,143 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122360560]
[2020-08-18 18:49:22,143 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:22,160 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,235 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:22,236 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,237 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 18:49:22,239 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,244 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 18:49:22,245 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,250 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:22,254 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,263 INFO  L134       CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 18:49:22,263 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122360560]
[2020-08-18 18:49:22,264 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:22,264 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-18 18:49:22,265 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400446978]
[2020-08-18 18:49:22,265 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-18 18:49:22,265 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,266 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-18 18:49:22,266 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72
[2020-08-18 18:49:22,266 INFO  L87              Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 9 states.
[2020-08-18 18:49:22,353 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:22,353 INFO  L93              Difference]: Finished difference Result 63 states and 68 transitions.
[2020-08-18 18:49:22,356 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 18:49:22,356 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 49
[2020-08-18 18:49:22,357 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:22,357 INFO  L225             Difference]: With dead ends: 63
[2020-08-18 18:49:22,358 INFO  L226             Difference]: Without dead ends: 61
[2020-08-18 18:49:22,360 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90
[2020-08-18 18:49:22,360 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 61 states.
[2020-08-18 18:49:22,370 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60.
[2020-08-18 18:49:22,371 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 60 states.
[2020-08-18 18:49:22,373 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions.
[2020-08-18 18:49:22,374 INFO  L78                 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49
[2020-08-18 18:49:22,374 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:22,375 INFO  L479      AbstractCegarLoop]: Abstraction has 60 states and 65 transitions.
[2020-08-18 18:49:22,375 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-18 18:49:22,376 INFO  L276                IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions.
[2020-08-18 18:49:22,379 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 66
[2020-08-18 18:49:22,379 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:22,380 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:22,380 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-08-18 18:49:22,381 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:22,381 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:22,381 INFO  L82        PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times
[2020-08-18 18:49:22,384 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,385 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946843090]
[2020-08-18 18:49:22,385 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:22,429 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,576 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:22,576 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,577 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 18:49:22,579 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,584 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 18:49:22,588 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,594 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:22,595 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,601 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:22,602 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,605 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:22,606 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,621 INFO  L134       CoverageAnalysis]: Checked inductivity of 120 backedges. 60 proven. 20 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked.
[2020-08-18 18:49:22,621 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946843090]
[2020-08-18 18:49:22,622 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:22,622 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-08-18 18:49:22,622 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597223844]
[2020-08-18 18:49:22,623 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 18:49:22,624 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,624 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 18:49:22,624 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156
[2020-08-18 18:49:22,625 INFO  L87              Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 13 states.
[2020-08-18 18:49:22,809 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:22,809 INFO  L93              Difference]: Finished difference Result 115 states and 135 transitions.
[2020-08-18 18:49:22,810 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 18:49:22,810 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 65
[2020-08-18 18:49:22,810 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:22,811 INFO  L225             Difference]: With dead ends: 115
[2020-08-18 18:49:22,811 INFO  L226             Difference]: Without dead ends: 82
[2020-08-18 18:49:22,812 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306
[2020-08-18 18:49:22,813 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 82 states.
[2020-08-18 18:49:22,819 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62.
[2020-08-18 18:49:22,820 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 62 states.
[2020-08-18 18:49:22,821 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions.
[2020-08-18 18:49:22,821 INFO  L78                 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65
[2020-08-18 18:49:22,821 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:22,821 INFO  L479      AbstractCegarLoop]: Abstraction has 62 states and 67 transitions.
[2020-08-18 18:49:22,821 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 18:49:22,822 INFO  L276                IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions.
[2020-08-18 18:49:22,823 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 68
[2020-08-18 18:49:22,823 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:22,823 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:22,823 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8
[2020-08-18 18:49:22,823 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:22,824 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:22,824 INFO  L82        PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times
[2020-08-18 18:49:22,824 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,824 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600311826]
[2020-08-18 18:49:22,824 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:22,841 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,958 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:22,959 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,960 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23
[2020-08-18 18:49:22,961 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,963 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31
[2020-08-18 18:49:22,965 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,967 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39
[2020-08-18 18:49:22,968 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,970 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47
[2020-08-18 18:49:22,971 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,973 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-08-18 18:49:22,974 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:22,981 INFO  L134       CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked.
[2020-08-18 18:49:22,981 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600311826]
[2020-08-18 18:49:22,982 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:22,982 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14
[2020-08-18 18:49:22,982 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132475844]
[2020-08-18 18:49:22,983 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-08-18 18:49:22,983 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:22,983 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-08-18 18:49:22,983 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182
[2020-08-18 18:49:22,984 INFO  L87              Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 14 states.
[2020-08-18 18:49:23,264 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:23,264 INFO  L93              Difference]: Finished difference Result 119 states and 142 transitions.
[2020-08-18 18:49:23,264 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-08-18 18:49:23,265 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 67
[2020-08-18 18:49:23,265 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:23,266 INFO  L225             Difference]: With dead ends: 119
[2020-08-18 18:49:23,266 INFO  L226             Difference]: Without dead ends: 88
[2020-08-18 18:49:23,268 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=124, Invalid=256, Unknown=0, NotChecked=0, Total=380
[2020-08-18 18:49:23,268 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 88 states.
[2020-08-18 18:49:23,275 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64.
[2020-08-18 18:49:23,276 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 64 states.
[2020-08-18 18:49:23,277 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions.
[2020-08-18 18:49:23,277 INFO  L78                 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67
[2020-08-18 18:49:23,277 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:23,277 INFO  L479      AbstractCegarLoop]: Abstraction has 64 states and 69 transitions.
[2020-08-18 18:49:23,278 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-08-18 18:49:23,278 INFO  L276                IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions.
[2020-08-18 18:49:23,279 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 70
[2020-08-18 18:49:23,279 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:23,279 INFO  L422         BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:23,279 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9
[2020-08-18 18:49:23,279 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:23,280 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:23,280 INFO  L82        PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times
[2020-08-18 18:49:23,280 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:23,280 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426302541]
[2020-08-18 18:49:23,280 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:23,301 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,416 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:23,417 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,419 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 18:49:23,439 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,449 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33
[2020-08-18 18:49:23,451 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,454 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:23,455 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,460 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:23,463 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,466 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:23,467 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,479 INFO  L134       CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked.
[2020-08-18 18:49:23,480 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426302541]
[2020-08-18 18:49:23,480 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:23,480 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-08-18 18:49:23,481 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636982310]
[2020-08-18 18:49:23,481 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-18 18:49:23,482 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:23,482 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-18 18:49:23,483 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110
[2020-08-18 18:49:23,483 INFO  L87              Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 11 states.
[2020-08-18 18:49:23,610 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:23,610 INFO  L93              Difference]: Finished difference Result 79 states and 85 transitions.
[2020-08-18 18:49:23,613 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 18:49:23,613 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 69
[2020-08-18 18:49:23,614 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:23,617 INFO  L225             Difference]: With dead ends: 79
[2020-08-18 18:49:23,617 INFO  L226             Difference]: Without dead ends: 77
[2020-08-18 18:49:23,618 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132
[2020-08-18 18:49:23,619 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 77 states.
[2020-08-18 18:49:23,629 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76.
[2020-08-18 18:49:23,630 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 76 states.
[2020-08-18 18:49:23,632 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions.
[2020-08-18 18:49:23,632 INFO  L78                 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69
[2020-08-18 18:49:23,634 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:23,634 INFO  L479      AbstractCegarLoop]: Abstraction has 76 states and 82 transitions.
[2020-08-18 18:49:23,634 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-18 18:49:23,634 INFO  L276                IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions.
[2020-08-18 18:49:23,638 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 86
[2020-08-18 18:49:23,638 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:23,638 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:23,638 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10
[2020-08-18 18:49:23,639 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:23,639 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:23,639 INFO  L82        PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times
[2020-08-18 18:49:23,639 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:23,639 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284425198]
[2020-08-18 18:49:23,640 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:23,685 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,879 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:23,880 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,882 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 18:49:23,883 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,885 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33
[2020-08-18 18:49:23,887 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,888 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:23,889 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,891 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:23,892 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,894 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:23,895 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,898 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:23,899 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,901 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:23,903 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:23,912 INFO  L134       CoverageAnalysis]: Checked inductivity of 238 backedges. 112 proven. 42 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2020-08-18 18:49:23,913 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284425198]
[2020-08-18 18:49:23,913 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:23,913 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17
[2020-08-18 18:49:23,914 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529417732]
[2020-08-18 18:49:23,914 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-08-18 18:49:23,914 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:23,915 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-08-18 18:49:23,915 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272
[2020-08-18 18:49:23,915 INFO  L87              Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 17 states.
[2020-08-18 18:49:24,176 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:24,176 INFO  L93              Difference]: Finished difference Result 147 states and 174 transitions.
[2020-08-18 18:49:24,177 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-08-18 18:49:24,177 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 85
[2020-08-18 18:49:24,177 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:24,178 INFO  L225             Difference]: With dead ends: 147
[2020-08-18 18:49:24,178 INFO  L226             Difference]: Without dead ends: 106
[2020-08-18 18:49:24,179 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552
[2020-08-18 18:49:24,180 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 106 states.
[2020-08-18 18:49:24,186 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78.
[2020-08-18 18:49:24,186 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 78 states.
[2020-08-18 18:49:24,187 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions.
[2020-08-18 18:49:24,187 INFO  L78                 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85
[2020-08-18 18:49:24,188 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:24,188 INFO  L479      AbstractCegarLoop]: Abstraction has 78 states and 84 transitions.
[2020-08-18 18:49:24,188 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-08-18 18:49:24,188 INFO  L276                IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions.
[2020-08-18 18:49:24,189 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 88
[2020-08-18 18:49:24,189 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:24,189 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:24,189 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11
[2020-08-18 18:49:24,190 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:24,190 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:24,190 INFO  L82        PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times
[2020-08-18 18:49:24,190 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:24,190 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742129061]
[2020-08-18 18:49:24,191 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:24,207 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,386 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:24,387 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,388 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27
[2020-08-18 18:49:24,389 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,390 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-08-18 18:49:24,392 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,393 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43
[2020-08-18 18:49:24,394 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,395 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 18:49:24,396 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,398 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-08-18 18:49:24,399 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,400 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:49:24,401 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,403 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:49:24,404 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,413 INFO  L134       CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2020-08-18 18:49:24,413 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742129061]
[2020-08-18 18:49:24,414 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:24,414 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18
[2020-08-18 18:49:24,414 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819581856]
[2020-08-18 18:49:24,414 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 18 states
[2020-08-18 18:49:24,415 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:24,415 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants.
[2020-08-18 18:49:24,415 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306
[2020-08-18 18:49:24,415 INFO  L87              Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 18 states.
[2020-08-18 18:49:24,704 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:24,704 INFO  L93              Difference]: Finished difference Result 151 states and 181 transitions.
[2020-08-18 18:49:24,704 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2020-08-18 18:49:24,705 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states. Word has length 87
[2020-08-18 18:49:24,706 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:24,707 INFO  L225             Difference]: With dead ends: 151
[2020-08-18 18:49:24,707 INFO  L226             Difference]: Without dead ends: 112
[2020-08-18 18:49:24,708 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=205, Invalid=445, Unknown=0, NotChecked=0, Total=650
[2020-08-18 18:49:24,708 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 112 states.
[2020-08-18 18:49:24,714 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80.
[2020-08-18 18:49:24,714 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 80 states.
[2020-08-18 18:49:24,715 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions.
[2020-08-18 18:49:24,715 INFO  L78                 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87
[2020-08-18 18:49:24,715 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:24,716 INFO  L479      AbstractCegarLoop]: Abstraction has 80 states and 86 transitions.
[2020-08-18 18:49:24,716 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 18 states.
[2020-08-18 18:49:24,716 INFO  L276                IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions.
[2020-08-18 18:49:24,716 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 90
[2020-08-18 18:49:24,717 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:24,717 INFO  L422         BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:24,717 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12
[2020-08-18 18:49:24,717 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:24,717 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:24,718 INFO  L82        PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times
[2020-08-18 18:49:24,718 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:24,718 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252471882]
[2020-08-18 18:49:24,718 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:24,737 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,835 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:24,836 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,837 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 18:49:24,838 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,840 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:24,841 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,843 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:24,844 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,845 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:24,847 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,848 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:24,849 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,851 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:24,852 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,853 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:24,854 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:24,863 INFO  L134       CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2020-08-18 18:49:24,863 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252471882]
[2020-08-18 18:49:24,864 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:24,864 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-08-18 18:49:24,864 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335193477]
[2020-08-18 18:49:24,865 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 18:49:24,865 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:24,865 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 18:49:24,865 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156
[2020-08-18 18:49:24,866 INFO  L87              Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 13 states.
[2020-08-18 18:49:24,978 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:24,979 INFO  L93              Difference]: Finished difference Result 95 states and 102 transitions.
[2020-08-18 18:49:24,979 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-08-18 18:49:24,979 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 89
[2020-08-18 18:49:24,980 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:24,981 INFO  L225             Difference]: With dead ends: 95
[2020-08-18 18:49:24,981 INFO  L226             Difference]: Without dead ends: 93
[2020-08-18 18:49:24,982 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182
[2020-08-18 18:49:24,982 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 93 states.
[2020-08-18 18:49:24,989 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92.
[2020-08-18 18:49:24,989 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 92 states.
[2020-08-18 18:49:24,990 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions.
[2020-08-18 18:49:24,990 INFO  L78                 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89
[2020-08-18 18:49:24,991 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:24,991 INFO  L479      AbstractCegarLoop]: Abstraction has 92 states and 99 transitions.
[2020-08-18 18:49:24,991 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 18:49:24,991 INFO  L276                IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions.
[2020-08-18 18:49:24,992 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 106
[2020-08-18 18:49:24,993 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:24,993 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:24,993 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13
[2020-08-18 18:49:24,993 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:24,994 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:24,994 INFO  L82        PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times
[2020-08-18 18:49:24,994 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:24,994 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066276589]
[2020-08-18 18:49:24,994 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:25,019 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,275 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:25,276 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,277 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 18:49:25,277 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,279 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:25,280 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,282 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:25,283 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,285 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:25,288 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,291 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:25,292 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,294 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:25,294 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,295 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:25,296 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,299 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:25,300 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,303 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:25,306 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,320 INFO  L134       CoverageAnalysis]: Checked inductivity of 396 backedges. 180 proven. 72 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked.
[2020-08-18 18:49:25,321 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066276589]
[2020-08-18 18:49:25,322 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:25,322 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21
[2020-08-18 18:49:25,322 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692277650]
[2020-08-18 18:49:25,323 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-08-18 18:49:25,323 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:25,324 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-08-18 18:49:25,324 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420
[2020-08-18 18:49:25,324 INFO  L87              Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 21 states.
[2020-08-18 18:49:25,644 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:25,645 INFO  L93              Difference]: Finished difference Result 179 states and 213 transitions.
[2020-08-18 18:49:25,649 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. 
[2020-08-18 18:49:25,649 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 105
[2020-08-18 18:49:25,650 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:25,651 INFO  L225             Difference]: With dead ends: 179
[2020-08-18 18:49:25,652 INFO  L226             Difference]: Without dead ends: 130
[2020-08-18 18:49:25,655 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=606, Unknown=0, NotChecked=0, Total=870
[2020-08-18 18:49:25,656 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 130 states.
[2020-08-18 18:49:25,668 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94.
[2020-08-18 18:49:25,668 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 94 states.
[2020-08-18 18:49:25,670 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions.
[2020-08-18 18:49:25,671 INFO  L78                 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105
[2020-08-18 18:49:25,671 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:25,671 INFO  L479      AbstractCegarLoop]: Abstraction has 94 states and 101 transitions.
[2020-08-18 18:49:25,671 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-08-18 18:49:25,671 INFO  L276                IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions.
[2020-08-18 18:49:25,672 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 108
[2020-08-18 18:49:25,672 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:25,673 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:25,673 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14
[2020-08-18 18:49:25,673 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:25,673 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:25,673 INFO  L82        PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times
[2020-08-18 18:49:25,674 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:25,674 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638596672]
[2020-08-18 18:49:25,674 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:25,701 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,927 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:25,928 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,929 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31
[2020-08-18 18:49:25,930 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,931 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39
[2020-08-18 18:49:25,933 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,934 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47
[2020-08-18 18:49:25,935 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,937 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-08-18 18:49:25,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,939 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63
[2020-08-18 18:49:25,940 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,941 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71
[2020-08-18 18:49:25,942 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,944 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 18:49:25,945 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,946 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 18:49:25,947 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,949 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95
[2020-08-18 18:49:25,950 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:25,973 INFO  L134       CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked.
[2020-08-18 18:49:25,973 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638596672]
[2020-08-18 18:49:25,973 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:25,974 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22
[2020-08-18 18:49:25,974 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755562882]
[2020-08-18 18:49:25,974 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 22 states
[2020-08-18 18:49:25,975 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:25,975 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants.
[2020-08-18 18:49:25,975 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462
[2020-08-18 18:49:25,975 INFO  L87              Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 22 states.
[2020-08-18 18:49:26,371 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:26,371 INFO  L93              Difference]: Finished difference Result 183 states and 220 transitions.
[2020-08-18 18:49:26,371 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2020-08-18 18:49:26,371 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states. Word has length 107
[2020-08-18 18:49:26,372 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:26,373 INFO  L225             Difference]: With dead ends: 183
[2020-08-18 18:49:26,373 INFO  L226             Difference]: Without dead ends: 136
[2020-08-18 18:49:26,375 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=686, Unknown=0, NotChecked=0, Total=992
[2020-08-18 18:49:26,376 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 136 states.
[2020-08-18 18:49:26,387 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96.
[2020-08-18 18:49:26,387 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 96 states.
[2020-08-18 18:49:26,388 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions.
[2020-08-18 18:49:26,388 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107
[2020-08-18 18:49:26,388 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:26,389 INFO  L479      AbstractCegarLoop]: Abstraction has 96 states and 103 transitions.
[2020-08-18 18:49:26,389 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 22 states.
[2020-08-18 18:49:26,389 INFO  L276                IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions.
[2020-08-18 18:49:26,390 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 110
[2020-08-18 18:49:26,390 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:26,390 INFO  L422         BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:26,391 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15
[2020-08-18 18:49:26,391 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:26,391 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:26,391 INFO  L82        PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times
[2020-08-18 18:49:26,391 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:26,392 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652194008]
[2020-08-18 18:49:26,392 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:26,428 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,566 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:26,567 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,567 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33
[2020-08-18 18:49:26,568 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,570 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:26,571 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,572 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:26,573 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,574 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:26,575 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,577 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:26,578 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,579 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:26,580 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,581 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:26,582 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,583 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:26,584 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,585 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:26,587 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:26,599 INFO  L134       CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked.
[2020-08-18 18:49:26,600 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652194008]
[2020-08-18 18:49:26,600 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:26,600 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15
[2020-08-18 18:49:26,600 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552885948]
[2020-08-18 18:49:26,601 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-08-18 18:49:26,601 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:26,601 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-08-18 18:49:26,601 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210
[2020-08-18 18:49:26,602 INFO  L87              Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 15 states.
[2020-08-18 18:49:26,718 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:26,719 INFO  L93              Difference]: Finished difference Result 111 states and 119 transitions.
[2020-08-18 18:49:26,719 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-08-18 18:49:26,719 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 109
[2020-08-18 18:49:26,720 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:26,721 INFO  L225             Difference]: With dead ends: 111
[2020-08-18 18:49:26,721 INFO  L226             Difference]: Without dead ends: 109
[2020-08-18 18:49:26,721 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240
[2020-08-18 18:49:26,724 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 109 states.
[2020-08-18 18:49:26,732 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108.
[2020-08-18 18:49:26,733 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 108 states.
[2020-08-18 18:49:26,734 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions.
[2020-08-18 18:49:26,734 INFO  L78                 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109
[2020-08-18 18:49:26,735 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:26,735 INFO  L479      AbstractCegarLoop]: Abstraction has 108 states and 116 transitions.
[2020-08-18 18:49:26,735 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-08-18 18:49:26,735 INFO  L276                IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions.
[2020-08-18 18:49:26,736 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 126
[2020-08-18 18:49:26,736 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:26,737 INFO  L422         BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:26,737 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16
[2020-08-18 18:49:26,737 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:26,738 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:26,738 INFO  L82        PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times
[2020-08-18 18:49:26,738 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:26,738 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686375093]
[2020-08-18 18:49:26,738 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:26,774 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,124 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:27,125 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,126 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33
[2020-08-18 18:49:27,127 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,128 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:27,129 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,131 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:27,132 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,133 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:27,134 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,136 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:27,137 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,139 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:27,140 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,142 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:27,143 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,145 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:27,146 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,148 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:27,149 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,151 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:27,153 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,155 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:27,156 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,182 INFO  L134       CoverageAnalysis]: Checked inductivity of 594 backedges. 264 proven. 110 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked.
[2020-08-18 18:49:27,182 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686375093]
[2020-08-18 18:49:27,183 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:27,183 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25
[2020-08-18 18:49:27,183 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373398429]
[2020-08-18 18:49:27,186 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 25 states
[2020-08-18 18:49:27,186 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:27,186 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2020-08-18 18:49:27,193 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=432, Unknown=0, NotChecked=0, Total=600
[2020-08-18 18:49:27,193 INFO  L87              Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 25 states.
[2020-08-18 18:49:27,597 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:27,597 INFO  L93              Difference]: Finished difference Result 211 states and 252 transitions.
[2020-08-18 18:49:27,598 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-08-18 18:49:27,598 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states. Word has length 125
[2020-08-18 18:49:27,598 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:27,600 INFO  L225             Difference]: With dead ends: 211
[2020-08-18 18:49:27,600 INFO  L226             Difference]: Without dead ends: 154
[2020-08-18 18:49:27,601 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=377, Invalid=883, Unknown=0, NotChecked=0, Total=1260
[2020-08-18 18:49:27,601 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 154 states.
[2020-08-18 18:49:27,608 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110.
[2020-08-18 18:49:27,608 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 110 states.
[2020-08-18 18:49:27,609 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions.
[2020-08-18 18:49:27,609 INFO  L78                 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125
[2020-08-18 18:49:27,610 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:27,610 INFO  L479      AbstractCegarLoop]: Abstraction has 110 states and 118 transitions.
[2020-08-18 18:49:27,610 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 25 states.
[2020-08-18 18:49:27,610 INFO  L276                IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions.
[2020-08-18 18:49:27,611 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 128
[2020-08-18 18:49:27,611 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:27,612 INFO  L422         BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:27,612 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17
[2020-08-18 18:49:27,612 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:27,612 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:27,612 INFO  L82        PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times
[2020-08-18 18:49:27,613 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:27,613 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208740708]
[2020-08-18 18:49:27,613 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:27,636 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,995 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:27,996 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:27,997 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-08-18 18:49:27,998 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,000 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43
[2020-08-18 18:49:28,001 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,003 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 18:49:28,004 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,005 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-08-18 18:49:28,006 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,008 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:49:28,009 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,011 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:49:28,012 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,013 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83
[2020-08-18 18:49:28,014 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,015 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-08-18 18:49:28,016 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,018 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 18:49:28,019 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,020 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107
[2020-08-18 18:49:28,022 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,023 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115
[2020-08-18 18:49:28,024 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,079 INFO  L134       CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked.
[2020-08-18 18:49:28,079 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208740708]
[2020-08-18 18:49:28,080 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:28,080 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26
[2020-08-18 18:49:28,080 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478866781]
[2020-08-18 18:49:28,081 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 26 states
[2020-08-18 18:49:28,081 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:28,081 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants.
[2020-08-18 18:49:28,082 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650
[2020-08-18 18:49:28,082 INFO  L87              Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 26 states.
[2020-08-18 18:49:28,686 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:28,686 INFO  L93              Difference]: Finished difference Result 215 states and 259 transitions.
[2020-08-18 18:49:28,686 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. 
[2020-08-18 18:49:28,687 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states. Word has length 127
[2020-08-18 18:49:28,687 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:28,691 INFO  L225             Difference]: With dead ends: 215
[2020-08-18 18:49:28,692 INFO  L226             Difference]: Without dead ends: 160
[2020-08-18 18:49:28,694 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=427, Invalid=979, Unknown=0, NotChecked=0, Total=1406
[2020-08-18 18:49:28,695 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 160 states.
[2020-08-18 18:49:28,708 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112.
[2020-08-18 18:49:28,709 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 112 states.
[2020-08-18 18:49:28,710 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions.
[2020-08-18 18:49:28,710 INFO  L78                 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127
[2020-08-18 18:49:28,711 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:28,711 INFO  L479      AbstractCegarLoop]: Abstraction has 112 states and 120 transitions.
[2020-08-18 18:49:28,711 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 26 states.
[2020-08-18 18:49:28,711 INFO  L276                IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions.
[2020-08-18 18:49:28,714 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 130
[2020-08-18 18:49:28,714 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:28,714 INFO  L422         BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:28,714 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18
[2020-08-18 18:49:28,715 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:28,715 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:28,715 INFO  L82        PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times
[2020-08-18 18:49:28,715 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:28,715 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070371270]
[2020-08-18 18:49:28,716 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:28,752 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,986 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:28,987 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,988 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:28,991 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,993 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:28,994 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,996 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:28,997 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:28,998 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:28,999 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,001 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:29,002 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,003 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:29,004 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,005 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:29,006 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,007 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:29,008 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,009 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:29,010 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,011 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:29,013 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,014 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:29,015 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,031 INFO  L134       CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked.
[2020-08-18 18:49:29,032 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070371270]
[2020-08-18 18:49:29,032 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:29,032 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17
[2020-08-18 18:49:29,032 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340829286]
[2020-08-18 18:49:29,034 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-08-18 18:49:29,034 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:29,034 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-08-18 18:49:29,035 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272
[2020-08-18 18:49:29,035 INFO  L87              Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 17 states.
[2020-08-18 18:49:29,175 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:29,176 INFO  L93              Difference]: Finished difference Result 127 states and 136 transitions.
[2020-08-18 18:49:29,176 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2020-08-18 18:49:29,176 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 129
[2020-08-18 18:49:29,177 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:29,178 INFO  L225             Difference]: With dead ends: 127
[2020-08-18 18:49:29,178 INFO  L226             Difference]: Without dead ends: 125
[2020-08-18 18:49:29,178 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=193, Unknown=0, NotChecked=0, Total=306
[2020-08-18 18:49:29,179 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 125 states.
[2020-08-18 18:49:29,187 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124.
[2020-08-18 18:49:29,187 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 124 states.
[2020-08-18 18:49:29,188 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions.
[2020-08-18 18:49:29,188 INFO  L78                 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129
[2020-08-18 18:49:29,189 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:29,189 INFO  L479      AbstractCegarLoop]: Abstraction has 124 states and 133 transitions.
[2020-08-18 18:49:29,189 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-08-18 18:49:29,189 INFO  L276                IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions.
[2020-08-18 18:49:29,190 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 146
[2020-08-18 18:49:29,191 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:29,191 INFO  L422         BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:29,191 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19
[2020-08-18 18:49:29,191 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:29,192 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:29,192 INFO  L82        PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times
[2020-08-18 18:49:29,192 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:29,192 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838930135]
[2020-08-18 18:49:29,192 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:29,243 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,680 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:29,681 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,682 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37
[2020-08-18 18:49:29,683 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,684 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:29,685 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,686 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:29,687 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,688 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:29,689 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,690 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:29,691 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,693 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:29,694 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,695 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:29,695 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,697 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:29,698 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,699 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:29,700 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,701 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:29,702 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,703 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:29,704 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,706 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:29,707 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,708 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:29,709 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:29,730 INFO  L134       CoverageAnalysis]: Checked inductivity of 832 backedges. 364 proven. 156 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked.
[2020-08-18 18:49:29,730 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838930135]
[2020-08-18 18:49:29,731 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:29,731 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29
[2020-08-18 18:49:29,731 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176990691]
[2020-08-18 18:49:29,731 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 29 states
[2020-08-18 18:49:29,732 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:29,732 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants.
[2020-08-18 18:49:29,732 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=588, Unknown=0, NotChecked=0, Total=812
[2020-08-18 18:49:29,733 INFO  L87              Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 29 states.
[2020-08-18 18:49:30,310 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:30,310 INFO  L93              Difference]: Finished difference Result 243 states and 291 transitions.
[2020-08-18 18:49:30,311 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. 
[2020-08-18 18:49:30,311 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states. Word has length 145
[2020-08-18 18:49:30,311 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:30,312 INFO  L225             Difference]: With dead ends: 243
[2020-08-18 18:49:30,312 INFO  L226             Difference]: Without dead ends: 178
[2020-08-18 18:49:30,314 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=510, Invalid=1212, Unknown=0, NotChecked=0, Total=1722
[2020-08-18 18:49:30,315 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 178 states.
[2020-08-18 18:49:30,323 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126.
[2020-08-18 18:49:30,323 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 126 states.
[2020-08-18 18:49:30,324 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions.
[2020-08-18 18:49:30,324 INFO  L78                 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145
[2020-08-18 18:49:30,324 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:30,324 INFO  L479      AbstractCegarLoop]: Abstraction has 126 states and 135 transitions.
[2020-08-18 18:49:30,325 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 29 states.
[2020-08-18 18:49:30,325 INFO  L276                IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions.
[2020-08-18 18:49:30,326 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 148
[2020-08-18 18:49:30,326 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:30,326 INFO  L422         BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:30,326 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20
[2020-08-18 18:49:30,327 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:30,327 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:30,327 INFO  L82        PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times
[2020-08-18 18:49:30,327 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:30,327 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647702499]
[2020-08-18 18:49:30,327 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:30,371 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,752 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:30,752 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,754 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39
[2020-08-18 18:49:30,755 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,756 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47
[2020-08-18 18:49:30,757 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,758 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-08-18 18:49:30,758 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,761 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63
[2020-08-18 18:49:30,762 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,763 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71
[2020-08-18 18:49:30,764 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,765 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 18:49:30,766 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,767 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 18:49:30,768 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,769 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95
[2020-08-18 18:49:30,770 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,771 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103
[2020-08-18 18:49:30,772 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,774 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111
[2020-08-18 18:49:30,774 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,776 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 119
[2020-08-18 18:49:30,777 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,778 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 127
[2020-08-18 18:49:30,778 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,780 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 135
[2020-08-18 18:49:30,780 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:30,802 INFO  L134       CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked.
[2020-08-18 18:49:30,803 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647702499]
[2020-08-18 18:49:30,804 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:30,804 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30
[2020-08-18 18:49:30,804 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722284188]
[2020-08-18 18:49:30,804 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 30 states
[2020-08-18 18:49:30,804 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:30,805 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants.
[2020-08-18 18:49:30,805 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=631, Unknown=0, NotChecked=0, Total=870
[2020-08-18 18:49:30,805 INFO  L87              Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 30 states.
[2020-08-18 18:49:31,381 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:31,381 INFO  L93              Difference]: Finished difference Result 247 states and 298 transitions.
[2020-08-18 18:49:31,381 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. 
[2020-08-18 18:49:31,382 INFO  L78                 Accepts]: Start accepts. Automaton has 30 states. Word has length 147
[2020-08-18 18:49:31,384 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:31,385 INFO  L225             Difference]: With dead ends: 247
[2020-08-18 18:49:31,386 INFO  L226             Difference]: Without dead ends: 184
[2020-08-18 18:49:31,387 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=568, Invalid=1324, Unknown=0, NotChecked=0, Total=1892
[2020-08-18 18:49:31,387 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 184 states.
[2020-08-18 18:49:31,397 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128.
[2020-08-18 18:49:31,397 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 128 states.
[2020-08-18 18:49:31,398 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions.
[2020-08-18 18:49:31,398 INFO  L78                 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147
[2020-08-18 18:49:31,399 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:31,399 INFO  L479      AbstractCegarLoop]: Abstraction has 128 states and 137 transitions.
[2020-08-18 18:49:31,399 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 30 states.
[2020-08-18 18:49:31,399 INFO  L276                IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions.
[2020-08-18 18:49:31,401 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 150
[2020-08-18 18:49:31,401 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:31,401 INFO  L422         BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:31,401 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21
[2020-08-18 18:49:31,402 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:31,402 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:31,402 INFO  L82        PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times
[2020-08-18 18:49:31,402 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:31,405 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537257627]
[2020-08-18 18:49:31,405 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:31,432 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,622 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:31,622 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,623 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:31,624 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,626 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:31,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,627 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:31,628 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,629 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:31,629 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,630 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:31,631 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,632 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:31,633 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,634 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:31,635 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,636 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:31,636 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,637 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:31,638 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,639 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:31,640 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,641 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:31,642 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,643 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:31,643 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,644 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:31,645 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:31,673 INFO  L134       CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked.
[2020-08-18 18:49:31,674 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537257627]
[2020-08-18 18:49:31,674 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:31,674 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19
[2020-08-18 18:49:31,674 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990718]
[2020-08-18 18:49:31,675 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-08-18 18:49:31,675 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:31,675 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-08-18 18:49:31,676 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342
[2020-08-18 18:49:31,676 INFO  L87              Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 19 states.
[2020-08-18 18:49:31,858 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:31,858 INFO  L93              Difference]: Finished difference Result 143 states and 153 transitions.
[2020-08-18 18:49:31,859 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. 
[2020-08-18 18:49:31,859 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 149
[2020-08-18 18:49:31,860 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:31,861 INFO  L225             Difference]: With dead ends: 143
[2020-08-18 18:49:31,861 INFO  L226             Difference]: Without dead ends: 141
[2020-08-18 18:49:31,861 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=144, Invalid=236, Unknown=0, NotChecked=0, Total=380
[2020-08-18 18:49:31,862 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 141 states.
[2020-08-18 18:49:31,870 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140.
[2020-08-18 18:49:31,871 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 140 states.
[2020-08-18 18:49:31,871 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions.
[2020-08-18 18:49:31,872 INFO  L78                 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149
[2020-08-18 18:49:31,872 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:31,872 INFO  L479      AbstractCegarLoop]: Abstraction has 140 states and 150 transitions.
[2020-08-18 18:49:31,872 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-08-18 18:49:31,873 INFO  L276                IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions.
[2020-08-18 18:49:31,874 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 166
[2020-08-18 18:49:31,874 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:31,875 INFO  L422         BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:31,875 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22
[2020-08-18 18:49:31,875 INFO  L427      AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:31,875 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:31,875 INFO  L82        PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times
[2020-08-18 18:49:31,876 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:31,876 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068473252]
[2020-08-18 18:49:31,876 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:31,908 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,437 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:32,438 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,439 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 18:49:32,439 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,441 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:32,441 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,443 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:32,443 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,444 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:32,445 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,446 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:32,447 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,448 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:32,449 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,450 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:32,451 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,452 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:32,452 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,454 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:32,454 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,456 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:32,456 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,457 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:32,458 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,460 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:32,460 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,462 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:32,463 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,464 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:49:32,465 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,466 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:49:32,467 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:32,496 INFO  L134       CoverageAnalysis]: Checked inductivity of 1110 backedges. 480 proven. 210 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked.
[2020-08-18 18:49:32,496 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068473252]
[2020-08-18 18:49:32,497 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:32,497 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33
[2020-08-18 18:49:32,497 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706139395]
[2020-08-18 18:49:32,497 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 33 states
[2020-08-18 18:49:32,498 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:32,498 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants.
[2020-08-18 18:49:32,498 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=768, Unknown=0, NotChecked=0, Total=1056
[2020-08-18 18:49:32,499 INFO  L87              Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 33 states.
[2020-08-18 18:49:33,218 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:33,218 INFO  L93              Difference]: Finished difference Result 275 states and 330 transitions.
[2020-08-18 18:49:33,222 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. 
[2020-08-18 18:49:33,222 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states. Word has length 165
[2020-08-18 18:49:33,223 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:33,224 INFO  L225             Difference]: With dead ends: 275
[2020-08-18 18:49:33,224 INFO  L226             Difference]: Without dead ends: 202
[2020-08-18 18:49:33,225 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=663, Invalid=1593, Unknown=0, NotChecked=0, Total=2256
[2020-08-18 18:49:33,226 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 202 states.
[2020-08-18 18:49:33,233 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142.
[2020-08-18 18:49:33,233 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 142 states.
[2020-08-18 18:49:33,234 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions.
[2020-08-18 18:49:33,235 INFO  L78                 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165
[2020-08-18 18:49:33,235 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:33,235 INFO  L479      AbstractCegarLoop]: Abstraction has 142 states and 152 transitions.
[2020-08-18 18:49:33,235 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 33 states.
[2020-08-18 18:49:33,235 INFO  L276                IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions.
[2020-08-18 18:49:33,237 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 168
[2020-08-18 18:49:33,237 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:33,237 INFO  L422         BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:33,238 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23
[2020-08-18 18:49:33,238 INFO  L427      AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:33,238 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:33,238 INFO  L82        PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times
[2020-08-18 18:49:33,238 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:33,239 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074530967]
[2020-08-18 18:49:33,239 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:33,270 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,824 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:33,825 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,826 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43
[2020-08-18 18:49:33,827 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,828 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 18:49:33,829 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,831 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-08-18 18:49:33,832 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,833 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:49:33,834 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,835 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:49:33,836 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,838 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83
[2020-08-18 18:49:33,838 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,839 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-08-18 18:49:33,840 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,841 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 18:49:33,842 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,844 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107
[2020-08-18 18:49:33,845 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,846 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115
[2020-08-18 18:49:33,847 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,848 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 123
[2020-08-18 18:49:33,849 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,851 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131
[2020-08-18 18:49:33,852 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,853 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 139
[2020-08-18 18:49:33,854 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,856 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 147
[2020-08-18 18:49:33,857 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,858 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 155
[2020-08-18 18:49:33,859 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:33,900 INFO  L134       CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked.
[2020-08-18 18:49:33,901 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074530967]
[2020-08-18 18:49:33,901 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:33,901 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34
[2020-08-18 18:49:33,901 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221309379]
[2020-08-18 18:49:33,902 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 34 states
[2020-08-18 18:49:33,902 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:33,902 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants.
[2020-08-18 18:49:33,903 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122
[2020-08-18 18:49:33,903 INFO  L87              Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 34 states.
[2020-08-18 18:49:34,591 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:34,591 INFO  L93              Difference]: Finished difference Result 279 states and 337 transitions.
[2020-08-18 18:49:34,591 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. 
[2020-08-18 18:49:34,591 INFO  L78                 Accepts]: Start accepts. Automaton has 34 states. Word has length 167
[2020-08-18 18:49:34,592 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:34,595 INFO  L225             Difference]: With dead ends: 279
[2020-08-18 18:49:34,595 INFO  L226             Difference]: Without dead ends: 208
[2020-08-18 18:49:34,596 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=729, Invalid=1721, Unknown=0, NotChecked=0, Total=2450
[2020-08-18 18:49:34,597 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 208 states.
[2020-08-18 18:49:34,609 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144.
[2020-08-18 18:49:34,609 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 144 states.
[2020-08-18 18:49:34,610 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions.
[2020-08-18 18:49:34,611 INFO  L78                 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167
[2020-08-18 18:49:34,611 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:34,611 INFO  L479      AbstractCegarLoop]: Abstraction has 144 states and 154 transitions.
[2020-08-18 18:49:34,611 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 34 states.
[2020-08-18 18:49:34,611 INFO  L276                IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions.
[2020-08-18 18:49:34,614 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 170
[2020-08-18 18:49:34,614 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:34,614 INFO  L422         BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:34,614 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24
[2020-08-18 18:49:34,615 INFO  L427      AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:34,615 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:34,615 INFO  L82        PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times
[2020-08-18 18:49:34,615 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:34,615 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074959932]
[2020-08-18 18:49:34,616 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:34,679 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,911 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:34,911 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,912 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:34,913 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,914 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:34,915 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,920 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:34,920 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,922 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:34,923 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,924 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:34,925 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,926 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:34,927 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,928 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:34,928 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,930 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:34,930 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,933 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:34,933 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,935 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:34,935 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,936 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:34,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,938 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:34,939 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,940 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:34,941 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,942 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:34,943 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,944 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:34,945 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:34,968 INFO  L134       CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked.
[2020-08-18 18:49:34,969 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074959932]
[2020-08-18 18:49:34,969 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:34,969 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21
[2020-08-18 18:49:34,969 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421877978]
[2020-08-18 18:49:34,970 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-08-18 18:49:34,970 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:34,971 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-08-18 18:49:34,971 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420
[2020-08-18 18:49:34,971 INFO  L87              Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 21 states.
[2020-08-18 18:49:35,174 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:35,175 INFO  L93              Difference]: Finished difference Result 159 states and 170 transitions.
[2020-08-18 18:49:35,175 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2020-08-18 18:49:35,176 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 169
[2020-08-18 18:49:35,177 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:35,180 INFO  L225             Difference]: With dead ends: 159
[2020-08-18 18:49:35,181 INFO  L226             Difference]: Without dead ends: 157
[2020-08-18 18:49:35,181 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=179, Invalid=283, Unknown=0, NotChecked=0, Total=462
[2020-08-18 18:49:35,182 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 157 states.
[2020-08-18 18:49:35,197 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156.
[2020-08-18 18:49:35,198 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 156 states.
[2020-08-18 18:49:35,200 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions.
[2020-08-18 18:49:35,201 INFO  L78                 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169
[2020-08-18 18:49:35,202 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:35,202 INFO  L479      AbstractCegarLoop]: Abstraction has 156 states and 167 transitions.
[2020-08-18 18:49:35,202 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-08-18 18:49:35,202 INFO  L276                IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions.
[2020-08-18 18:49:35,204 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 186
[2020-08-18 18:49:35,204 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:35,204 INFO  L422         BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:35,205 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25
[2020-08-18 18:49:35,205 INFO  L427      AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:35,205 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:35,205 INFO  L82        PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times
[2020-08-18 18:49:35,205 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:35,206 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125191109]
[2020-08-18 18:49:35,206 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:35,251 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,926 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:35,927 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,928 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 18:49:35,929 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,930 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:35,931 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,936 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:35,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,941 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:35,942 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,943 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:35,944 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,945 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:35,946 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,947 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:35,947 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,948 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:35,949 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,950 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:35,951 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,952 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:35,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,957 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:35,963 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,965 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:35,966 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,967 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:35,968 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,971 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:35,972 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,975 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:35,976 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,977 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:49:35,978 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:35,979 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:49:35,980 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:36,023 INFO  L134       CoverageAnalysis]: Checked inductivity of 1428 backedges. 612 proven. 272 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked.
[2020-08-18 18:49:36,023 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125191109]
[2020-08-18 18:49:36,023 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:36,023 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37
[2020-08-18 18:49:36,024 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71355111]
[2020-08-18 18:49:36,024 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 37 states
[2020-08-18 18:49:36,024 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:36,025 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants.
[2020-08-18 18:49:36,025 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=972, Unknown=0, NotChecked=0, Total=1332
[2020-08-18 18:49:36,025 INFO  L87              Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 37 states.
[2020-08-18 18:49:36,856 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:36,857 INFO  L93              Difference]: Finished difference Result 307 states and 369 transitions.
[2020-08-18 18:49:36,857 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. 
[2020-08-18 18:49:36,857 INFO  L78                 Accepts]: Start accepts. Automaton has 37 states. Word has length 185
[2020-08-18 18:49:36,858 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:36,859 INFO  L225             Difference]: With dead ends: 307
[2020-08-18 18:49:36,859 INFO  L226             Difference]: Without dead ends: 226
[2020-08-18 18:49:36,861 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=836, Invalid=2026, Unknown=0, NotChecked=0, Total=2862
[2020-08-18 18:49:36,862 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 226 states.
[2020-08-18 18:49:36,873 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158.
[2020-08-18 18:49:36,873 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 158 states.
[2020-08-18 18:49:36,874 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions.
[2020-08-18 18:49:36,874 INFO  L78                 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185
[2020-08-18 18:49:36,874 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:36,875 INFO  L479      AbstractCegarLoop]: Abstraction has 158 states and 169 transitions.
[2020-08-18 18:49:36,875 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 37 states.
[2020-08-18 18:49:36,875 INFO  L276                IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions.
[2020-08-18 18:49:36,877 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 188
[2020-08-18 18:49:36,877 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:36,877 INFO  L422         BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:36,877 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26
[2020-08-18 18:49:36,877 INFO  L427      AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:36,878 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:36,878 INFO  L82        PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times
[2020-08-18 18:49:36,878 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:36,878 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019675480]
[2020-08-18 18:49:36,878 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:36,910 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,559 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:37,559 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,560 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47
[2020-08-18 18:49:37,561 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,562 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-08-18 18:49:37,562 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,564 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63
[2020-08-18 18:49:37,565 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,566 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71
[2020-08-18 18:49:37,567 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,568 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 18:49:37,569 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,569 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 18:49:37,570 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,571 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95
[2020-08-18 18:49:37,572 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,573 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103
[2020-08-18 18:49:37,574 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,575 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111
[2020-08-18 18:49:37,575 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,576 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 119
[2020-08-18 18:49:37,577 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,579 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 127
[2020-08-18 18:49:37,579 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,581 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 135
[2020-08-18 18:49:37,581 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,582 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 143
[2020-08-18 18:49:37,583 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,584 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151
[2020-08-18 18:49:37,585 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,586 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 159
[2020-08-18 18:49:37,587 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,588 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 167
[2020-08-18 18:49:37,588 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,589 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 175
[2020-08-18 18:49:37,590 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:37,645 INFO  L134       CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked.
[2020-08-18 18:49:37,645 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019675480]
[2020-08-18 18:49:37,645 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:37,645 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38
[2020-08-18 18:49:37,646 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310429259]
[2020-08-18 18:49:37,647 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 38 states
[2020-08-18 18:49:37,647 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:37,647 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants.
[2020-08-18 18:49:37,648 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=1027, Unknown=0, NotChecked=0, Total=1406
[2020-08-18 18:49:37,648 INFO  L87              Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 38 states.
[2020-08-18 18:49:38,513 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:38,513 INFO  L93              Difference]: Finished difference Result 311 states and 376 transitions.
[2020-08-18 18:49:38,513 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. 
[2020-08-18 18:49:38,513 INFO  L78                 Accepts]: Start accepts. Automaton has 38 states. Word has length 187
[2020-08-18 18:49:38,514 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:38,515 INFO  L225             Difference]: With dead ends: 311
[2020-08-18 18:49:38,515 INFO  L226             Difference]: Without dead ends: 232
[2020-08-18 18:49:38,517 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=910, Invalid=2170, Unknown=0, NotChecked=0, Total=3080
[2020-08-18 18:49:38,518 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 232 states.
[2020-08-18 18:49:38,525 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160.
[2020-08-18 18:49:38,526 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 160 states.
[2020-08-18 18:49:38,527 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions.
[2020-08-18 18:49:38,527 INFO  L78                 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187
[2020-08-18 18:49:38,527 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:38,527 INFO  L479      AbstractCegarLoop]: Abstraction has 160 states and 171 transitions.
[2020-08-18 18:49:38,527 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 38 states.
[2020-08-18 18:49:38,528 INFO  L276                IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions.
[2020-08-18 18:49:38,530 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 190
[2020-08-18 18:49:38,530 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:38,530 INFO  L422         BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:38,530 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27
[2020-08-18 18:49:38,530 INFO  L427      AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:38,531 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:38,531 INFO  L82        PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times
[2020-08-18 18:49:38,531 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:38,531 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290491943]
[2020-08-18 18:49:38,531 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:38,563 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,825 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:38,826 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,826 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:38,827 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,828 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:38,829 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,831 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:38,831 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,832 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:38,833 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,834 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:38,834 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,835 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:38,835 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,836 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:38,837 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,838 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:38,838 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,839 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:38,839 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,844 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:38,845 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,846 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:38,847 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,848 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:38,848 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,850 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:49:38,850 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,851 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:49:38,852 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,853 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:49:38,853 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,855 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:49:38,855 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,863 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:49:38,864 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:38,896 INFO  L134       CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked.
[2020-08-18 18:49:38,896 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290491943]
[2020-08-18 18:49:38,897 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:38,897 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23
[2020-08-18 18:49:38,897 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862644339]
[2020-08-18 18:49:38,899 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 23 states
[2020-08-18 18:49:38,899 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:38,900 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants.
[2020-08-18 18:49:38,900 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506
[2020-08-18 18:49:38,900 INFO  L87              Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 23 states.
[2020-08-18 18:49:39,094 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:39,094 INFO  L93              Difference]: Finished difference Result 175 states and 187 transitions.
[2020-08-18 18:49:39,095 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-08-18 18:49:39,095 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states. Word has length 189
[2020-08-18 18:49:39,095 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:39,097 INFO  L225             Difference]: With dead ends: 175
[2020-08-18 18:49:39,097 INFO  L226             Difference]: Without dead ends: 173
[2020-08-18 18:49:39,102 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=218, Invalid=334, Unknown=0, NotChecked=0, Total=552
[2020-08-18 18:49:39,102 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 173 states.
[2020-08-18 18:49:39,126 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172.
[2020-08-18 18:49:39,127 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 172 states.
[2020-08-18 18:49:39,128 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions.
[2020-08-18 18:49:39,128 INFO  L78                 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189
[2020-08-18 18:49:39,129 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:39,129 INFO  L479      AbstractCegarLoop]: Abstraction has 172 states and 184 transitions.
[2020-08-18 18:49:39,129 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 23 states.
[2020-08-18 18:49:39,129 INFO  L276                IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions.
[2020-08-18 18:49:39,130 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 206
[2020-08-18 18:49:39,130 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:39,130 INFO  L422         BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:39,131 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28
[2020-08-18 18:49:39,131 INFO  L427      AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:39,131 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:39,131 INFO  L82        PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times
[2020-08-18 18:49:39,131 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:39,132 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662492553]
[2020-08-18 18:49:39,132 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:39,165 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,905 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:39,905 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,906 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49
[2020-08-18 18:49:39,907 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,907 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:39,908 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,909 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:39,909 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,910 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:39,911 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,912 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:39,913 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,914 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:39,914 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,915 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:39,916 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,917 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:39,918 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,919 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:39,920 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,921 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:39,921 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,922 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:39,923 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,924 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:39,924 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,925 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:49:39,926 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,927 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:49:39,928 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,928 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:49:39,929 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,930 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:49:39,931 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,931 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:49:39,932 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,933 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 185
[2020-08-18 18:49:39,934 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,934 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193
[2020-08-18 18:49:39,935 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:39,974 INFO  L134       CoverageAnalysis]: Checked inductivity of 1786 backedges. 760 proven. 342 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked.
[2020-08-18 18:49:39,974 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662492553]
[2020-08-18 18:49:39,974 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:39,974 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41
[2020-08-18 18:49:39,975 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855987470]
[2020-08-18 18:49:39,975 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 41 states
[2020-08-18 18:49:39,975 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:39,976 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants.
[2020-08-18 18:49:39,976 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=1200, Unknown=0, NotChecked=0, Total=1640
[2020-08-18 18:49:39,976 INFO  L87              Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 41 states.
[2020-08-18 18:49:40,941 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:40,941 INFO  L93              Difference]: Finished difference Result 339 states and 408 transitions.
[2020-08-18 18:49:40,943 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. 
[2020-08-18 18:49:40,943 INFO  L78                 Accepts]: Start accepts. Automaton has 41 states. Word has length 205
[2020-08-18 18:49:40,943 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:40,945 INFO  L225             Difference]: With dead ends: 339
[2020-08-18 18:49:40,945 INFO  L226             Difference]: Without dead ends: 250
[2020-08-18 18:49:40,947 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1029, Invalid=2511, Unknown=0, NotChecked=0, Total=3540
[2020-08-18 18:49:40,948 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 250 states.
[2020-08-18 18:49:40,956 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174.
[2020-08-18 18:49:40,956 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 174 states.
[2020-08-18 18:49:40,957 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions.
[2020-08-18 18:49:40,957 INFO  L78                 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205
[2020-08-18 18:49:40,957 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:40,957 INFO  L479      AbstractCegarLoop]: Abstraction has 174 states and 186 transitions.
[2020-08-18 18:49:40,958 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 41 states.
[2020-08-18 18:49:40,958 INFO  L276                IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions.
[2020-08-18 18:49:40,959 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 208
[2020-08-18 18:49:40,959 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:40,959 INFO  L422         BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:40,959 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29
[2020-08-18 18:49:40,960 INFO  L427      AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:40,960 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:40,960 INFO  L82        PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times
[2020-08-18 18:49:40,960 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:40,960 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276247652]
[2020-08-18 18:49:40,961 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:40,998 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,742 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:41,743 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,743 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 18:49:41,744 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,745 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-08-18 18:49:41,746 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,747 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:49:41,747 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,748 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:49:41,749 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,750 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83
[2020-08-18 18:49:41,751 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,752 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-08-18 18:49:41,752 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,753 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 18:49:41,754 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,755 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107
[2020-08-18 18:49:41,756 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,757 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115
[2020-08-18 18:49:41,758 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,759 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 123
[2020-08-18 18:49:41,759 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,760 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131
[2020-08-18 18:49:41,761 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,762 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 139
[2020-08-18 18:49:41,763 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,764 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 147
[2020-08-18 18:49:41,764 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,765 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 155
[2020-08-18 18:49:41,766 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,767 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163
[2020-08-18 18:49:41,768 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,769 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 171
[2020-08-18 18:49:41,770 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,771 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179
[2020-08-18 18:49:41,771 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,772 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 187
[2020-08-18 18:49:41,773 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,774 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 195
[2020-08-18 18:49:41,775 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:41,826 INFO  L134       CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked.
[2020-08-18 18:49:41,827 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276247652]
[2020-08-18 18:49:41,827 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:41,827 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42
[2020-08-18 18:49:41,827 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133020149]
[2020-08-18 18:49:41,828 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 42 states
[2020-08-18 18:49:41,828 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:41,828 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants.
[2020-08-18 18:49:41,829 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1261, Unknown=0, NotChecked=0, Total=1722
[2020-08-18 18:49:41,829 INFO  L87              Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 42 states.
[2020-08-18 18:49:42,895 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:42,895 INFO  L93              Difference]: Finished difference Result 343 states and 415 transitions.
[2020-08-18 18:49:42,896 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. 
[2020-08-18 18:49:42,896 INFO  L78                 Accepts]: Start accepts. Automaton has 42 states. Word has length 207
[2020-08-18 18:49:42,897 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:42,898 INFO  L225             Difference]: With dead ends: 343
[2020-08-18 18:49:42,898 INFO  L226             Difference]: Without dead ends: 256
[2020-08-18 18:49:42,900 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1111, Invalid=2671, Unknown=0, NotChecked=0, Total=3782
[2020-08-18 18:49:42,901 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 256 states.
[2020-08-18 18:49:42,909 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176.
[2020-08-18 18:49:42,909 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 176 states.
[2020-08-18 18:49:42,910 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions.
[2020-08-18 18:49:42,910 INFO  L78                 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207
[2020-08-18 18:49:42,910 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:42,911 INFO  L479      AbstractCegarLoop]: Abstraction has 176 states and 188 transitions.
[2020-08-18 18:49:42,911 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 42 states.
[2020-08-18 18:49:42,911 INFO  L276                IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions.
[2020-08-18 18:49:42,912 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 210
[2020-08-18 18:49:42,912 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:42,912 INFO  L422         BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:42,912 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30
[2020-08-18 18:49:42,913 INFO  L427      AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:42,913 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:42,913 INFO  L82        PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times
[2020-08-18 18:49:42,913 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:42,913 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656652052]
[2020-08-18 18:49:42,914 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:42,949 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,275 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:43,275 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,276 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:43,277 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,277 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:43,278 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,279 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:43,279 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,280 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:43,280 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,281 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:43,281 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,282 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:43,282 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,283 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:43,284 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,284 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:43,285 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,286 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:43,286 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,287 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:43,288 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,289 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:43,289 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,290 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:43,291 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,291 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:43,292 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,293 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:43,293 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,294 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:49:43,295 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,295 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:49:43,296 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,297 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:49:43,297 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,298 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:49:43,299 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,299 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:49:43,300 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:43,333 INFO  L134       CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked.
[2020-08-18 18:49:43,334 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656652052]
[2020-08-18 18:49:43,334 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:43,334 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25
[2020-08-18 18:49:43,334 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987971773]
[2020-08-18 18:49:43,335 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 25 states
[2020-08-18 18:49:43,335 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:43,335 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2020-08-18 18:49:43,335 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=343, Unknown=0, NotChecked=0, Total=600
[2020-08-18 18:49:43,336 INFO  L87              Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 25 states.
[2020-08-18 18:49:43,578 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:43,579 INFO  L93              Difference]: Finished difference Result 191 states and 204 transitions.
[2020-08-18 18:49:43,579 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. 
[2020-08-18 18:49:43,580 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states. Word has length 209
[2020-08-18 18:49:43,580 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:43,583 INFO  L225             Difference]: With dead ends: 191
[2020-08-18 18:49:43,584 INFO  L226             Difference]: Without dead ends: 189
[2020-08-18 18:49:43,584 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=261, Invalid=389, Unknown=0, NotChecked=0, Total=650
[2020-08-18 18:49:43,585 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 189 states.
[2020-08-18 18:49:43,593 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188.
[2020-08-18 18:49:43,594 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 188 states.
[2020-08-18 18:49:43,595 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions.
[2020-08-18 18:49:43,596 INFO  L78                 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209
[2020-08-18 18:49:43,596 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:43,596 INFO  L479      AbstractCegarLoop]: Abstraction has 188 states and 201 transitions.
[2020-08-18 18:49:43,596 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 25 states.
[2020-08-18 18:49:43,597 INFO  L276                IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions.
[2020-08-18 18:49:43,598 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 226
[2020-08-18 18:49:43,598 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:43,598 INFO  L422         BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:43,598 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31
[2020-08-18 18:49:43,598 INFO  L427      AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:43,599 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:43,599 INFO  L82        PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times
[2020-08-18 18:49:43,599 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:43,599 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774758509]
[2020-08-18 18:49:43,599 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:43,655 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,585 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:44,585 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,586 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53
[2020-08-18 18:49:44,587 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,588 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:44,588 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,589 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:44,590 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,590 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:44,591 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,592 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:44,592 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,593 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:44,593 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,594 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:44,595 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,596 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:44,596 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,597 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:44,598 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,599 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:44,600 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,601 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:44,601 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,602 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:44,603 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,604 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:44,605 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,606 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:44,606 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,607 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:49:44,608 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,609 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:49:44,610 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,611 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:49:44,611 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,612 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:49:44,613 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,614 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:49:44,615 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,616 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205
[2020-08-18 18:49:44,616 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,617 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 213
[2020-08-18 18:49:44,618 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:44,665 INFO  L134       CoverageAnalysis]: Checked inductivity of 2184 backedges. 924 proven. 420 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked.
[2020-08-18 18:49:44,665 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774758509]
[2020-08-18 18:49:44,666 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:44,666 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45
[2020-08-18 18:49:44,666 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015773556]
[2020-08-18 18:49:44,666 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 45 states
[2020-08-18 18:49:44,667 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:44,667 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants.
[2020-08-18 18:49:44,668 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=1452, Unknown=0, NotChecked=0, Total=1980
[2020-08-18 18:49:44,668 INFO  L87              Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 45 states.
[2020-08-18 18:49:45,712 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:45,712 INFO  L93              Difference]: Finished difference Result 371 states and 447 transitions.
[2020-08-18 18:49:45,712 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. 
[2020-08-18 18:49:45,713 INFO  L78                 Accepts]: Start accepts. Automaton has 45 states. Word has length 225
[2020-08-18 18:49:45,713 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:45,715 INFO  L225             Difference]: With dead ends: 371
[2020-08-18 18:49:45,715 INFO  L226             Difference]: Without dead ends: 274
[2020-08-18 18:49:45,717 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1242, Invalid=3048, Unknown=0, NotChecked=0, Total=4290
[2020-08-18 18:49:45,718 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 274 states.
[2020-08-18 18:49:45,727 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190.
[2020-08-18 18:49:45,727 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 190 states.
[2020-08-18 18:49:45,728 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions.
[2020-08-18 18:49:45,728 INFO  L78                 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225
[2020-08-18 18:49:45,729 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:45,729 INFO  L479      AbstractCegarLoop]: Abstraction has 190 states and 203 transitions.
[2020-08-18 18:49:45,729 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 45 states.
[2020-08-18 18:49:45,729 INFO  L276                IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions.
[2020-08-18 18:49:45,730 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 228
[2020-08-18 18:49:45,730 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:45,730 INFO  L422         BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:45,731 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32
[2020-08-18 18:49:45,731 INFO  L427      AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:45,731 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:45,731 INFO  L82        PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times
[2020-08-18 18:49:45,731 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:45,732 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105849745]
[2020-08-18 18:49:45,732 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:45,786 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,742 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:46,743 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,744 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55
[2020-08-18 18:49:46,744 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,745 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63
[2020-08-18 18:49:46,746 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,747 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71
[2020-08-18 18:49:46,748 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,749 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 18:49:46,749 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,750 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 18:49:46,751 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,752 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95
[2020-08-18 18:49:46,752 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,753 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103
[2020-08-18 18:49:46,754 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,755 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111
[2020-08-18 18:49:46,755 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,756 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 119
[2020-08-18 18:49:46,757 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,758 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 127
[2020-08-18 18:49:46,758 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,759 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 135
[2020-08-18 18:49:46,760 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,761 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 143
[2020-08-18 18:49:46,761 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,762 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151
[2020-08-18 18:49:46,763 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,763 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 159
[2020-08-18 18:49:46,764 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,765 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 167
[2020-08-18 18:49:46,766 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,766 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 175
[2020-08-18 18:49:46,767 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,768 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 183
[2020-08-18 18:49:46,769 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,770 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 191
[2020-08-18 18:49:46,771 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,772 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 199
[2020-08-18 18:49:46,772 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,773 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 207
[2020-08-18 18:49:46,774 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,775 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 215
[2020-08-18 18:49:46,775 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:46,823 INFO  L134       CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked.
[2020-08-18 18:49:46,824 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105849745]
[2020-08-18 18:49:46,824 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:46,824 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46
[2020-08-18 18:49:46,824 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788022383]
[2020-08-18 18:49:46,825 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 46 states
[2020-08-18 18:49:46,825 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:46,825 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants.
[2020-08-18 18:49:46,826 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=1519, Unknown=0, NotChecked=0, Total=2070
[2020-08-18 18:49:46,826 INFO  L87              Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 46 states.
[2020-08-18 18:49:48,072 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:48,072 INFO  L93              Difference]: Finished difference Result 375 states and 454 transitions.
[2020-08-18 18:49:48,072 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. 
[2020-08-18 18:49:48,073 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states. Word has length 227
[2020-08-18 18:49:48,073 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:48,075 INFO  L225             Difference]: With dead ends: 375
[2020-08-18 18:49:48,075 INFO  L226             Difference]: Without dead ends: 280
[2020-08-18 18:49:48,077 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1332, Invalid=3224, Unknown=0, NotChecked=0, Total=4556
[2020-08-18 18:49:48,077 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 280 states.
[2020-08-18 18:49:48,085 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192.
[2020-08-18 18:49:48,086 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 192 states.
[2020-08-18 18:49:48,087 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions.
[2020-08-18 18:49:48,087 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227
[2020-08-18 18:49:48,087 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:48,087 INFO  L479      AbstractCegarLoop]: Abstraction has 192 states and 205 transitions.
[2020-08-18 18:49:48,087 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 46 states.
[2020-08-18 18:49:48,087 INFO  L276                IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions.
[2020-08-18 18:49:48,088 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 230
[2020-08-18 18:49:48,089 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:48,089 INFO  L422         BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:48,089 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33
[2020-08-18 18:49:48,089 INFO  L427      AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:48,089 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:48,089 INFO  L82        PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times
[2020-08-18 18:49:48,090 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:48,090 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274156868]
[2020-08-18 18:49:48,090 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:48,129 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,491 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:48,492 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,493 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:48,493 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,494 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:48,495 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,495 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:48,496 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,496 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:48,497 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,497 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:48,498 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,498 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:48,499 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,500 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:48,500 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,501 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:48,502 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,503 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:48,503 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,504 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:48,505 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,505 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:48,506 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,507 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:49:48,507 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,508 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:49:48,509 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,509 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:49:48,510 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,511 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:49:48,511 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,512 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:49:48,513 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,514 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 185
[2020-08-18 18:49:48,514 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,515 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193
[2020-08-18 18:49:48,515 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,516 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201
[2020-08-18 18:49:48,517 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,518 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 209
[2020-08-18 18:49:48,518 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,519 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217
[2020-08-18 18:49:48,520 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:48,561 INFO  L134       CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked.
[2020-08-18 18:49:48,561 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274156868]
[2020-08-18 18:49:48,561 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:48,562 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27
[2020-08-18 18:49:48,562 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927637237]
[2020-08-18 18:49:48,562 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 27 states
[2020-08-18 18:49:48,563 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:48,563 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants.
[2020-08-18 18:49:48,563 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702
[2020-08-18 18:49:48,563 INFO  L87              Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 27 states.
[2020-08-18 18:49:48,853 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:48,853 INFO  L93              Difference]: Finished difference Result 207 states and 221 transitions.
[2020-08-18 18:49:48,857 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. 
[2020-08-18 18:49:48,857 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states. Word has length 229
[2020-08-18 18:49:48,857 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:48,858 INFO  L225             Difference]: With dead ends: 207
[2020-08-18 18:49:48,858 INFO  L226             Difference]: Without dead ends: 205
[2020-08-18 18:49:48,859 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=308, Invalid=448, Unknown=0, NotChecked=0, Total=756
[2020-08-18 18:49:48,859 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 205 states.
[2020-08-18 18:49:48,867 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204.
[2020-08-18 18:49:48,867 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 204 states.
[2020-08-18 18:49:48,868 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions.
[2020-08-18 18:49:48,868 INFO  L78                 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229
[2020-08-18 18:49:48,869 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:48,869 INFO  L479      AbstractCegarLoop]: Abstraction has 204 states and 218 transitions.
[2020-08-18 18:49:48,869 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 27 states.
[2020-08-18 18:49:48,869 INFO  L276                IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions.
[2020-08-18 18:49:48,870 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 246
[2020-08-18 18:49:48,870 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:48,871 INFO  L422         BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:48,871 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34
[2020-08-18 18:49:48,871 INFO  L427      AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:48,871 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:48,871 INFO  L82        PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times
[2020-08-18 18:49:48,872 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:48,872 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1787800184]
[2020-08-18 18:49:48,872 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:48,928 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,016 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:50,017 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,018 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57
[2020-08-18 18:49:50,019 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,020 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:49:50,020 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,021 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:49:50,021 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,022 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:49:50,022 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,023 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:49:50,023 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,024 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:49:50,025 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,026 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:49:50,026 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,027 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:49:50,028 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,028 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:49:50,029 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,030 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:49:50,030 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,031 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:49:50,032 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,032 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:49:50,033 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,034 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:49:50,034 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,035 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:49:50,036 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,036 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:49:50,037 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,038 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:49:50,038 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,039 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 185
[2020-08-18 18:49:50,040 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,041 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193
[2020-08-18 18:49:50,041 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,042 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201
[2020-08-18 18:49:50,043 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,043 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 209
[2020-08-18 18:49:50,044 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,045 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217
[2020-08-18 18:49:50,045 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,046 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 225
[2020-08-18 18:49:50,047 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,047 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 233
[2020-08-18 18:49:50,048 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:50,103 INFO  L134       CoverageAnalysis]: Checked inductivity of 2622 backedges. 1104 proven. 506 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked.
[2020-08-18 18:49:50,104 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1787800184]
[2020-08-18 18:49:50,104 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:50,104 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49
[2020-08-18 18:49:50,104 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706104843]
[2020-08-18 18:49:50,105 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 49 states
[2020-08-18 18:49:50,105 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:50,105 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants.
[2020-08-18 18:49:50,106 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=624, Invalid=1728, Unknown=0, NotChecked=0, Total=2352
[2020-08-18 18:49:50,106 INFO  L87              Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 49 states.
[2020-08-18 18:49:51,527 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:51,527 INFO  L93              Difference]: Finished difference Result 403 states and 486 transitions.
[2020-08-18 18:49:51,528 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. 
[2020-08-18 18:49:51,528 INFO  L78                 Accepts]: Start accepts. Automaton has 49 states. Word has length 245
[2020-08-18 18:49:51,528 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:51,530 INFO  L225             Difference]: With dead ends: 403
[2020-08-18 18:49:51,530 INFO  L226             Difference]: Without dead ends: 298
[2020-08-18 18:49:51,531 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 781 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1475, Invalid=3637, Unknown=0, NotChecked=0, Total=5112
[2020-08-18 18:49:51,532 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 298 states.
[2020-08-18 18:49:51,541 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206.
[2020-08-18 18:49:51,541 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 206 states.
[2020-08-18 18:49:51,542 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions.
[2020-08-18 18:49:51,542 INFO  L78                 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245
[2020-08-18 18:49:51,543 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:51,543 INFO  L479      AbstractCegarLoop]: Abstraction has 206 states and 220 transitions.
[2020-08-18 18:49:51,543 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 49 states.
[2020-08-18 18:49:51,543 INFO  L276                IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions.
[2020-08-18 18:49:51,544 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 248
[2020-08-18 18:49:51,544 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:51,544 INFO  L422         BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:51,545 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35
[2020-08-18 18:49:51,545 INFO  L427      AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:51,545 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:51,545 INFO  L82        PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times
[2020-08-18 18:49:51,545 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:51,546 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107863180]
[2020-08-18 18:49:51,546 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:51,604 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,717 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:52,717 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,718 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-08-18 18:49:52,719 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,720 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:49:52,721 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,722 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:49:52,722 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,723 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83
[2020-08-18 18:49:52,723 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,724 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-08-18 18:49:52,725 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,726 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 18:49:52,726 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,727 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107
[2020-08-18 18:49:52,728 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,728 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115
[2020-08-18 18:49:52,729 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,730 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 123
[2020-08-18 18:49:52,730 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,731 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131
[2020-08-18 18:49:52,732 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,732 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 139
[2020-08-18 18:49:52,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,734 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 147
[2020-08-18 18:49:52,734 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,735 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 155
[2020-08-18 18:49:52,736 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,737 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163
[2020-08-18 18:49:52,737 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,738 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 171
[2020-08-18 18:49:52,739 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,740 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179
[2020-08-18 18:49:52,740 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,741 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 187
[2020-08-18 18:49:52,742 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,743 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 195
[2020-08-18 18:49:52,743 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,744 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 203
[2020-08-18 18:49:52,745 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,746 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 211
[2020-08-18 18:49:52,746 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,747 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 219
[2020-08-18 18:49:52,748 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,749 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 227
[2020-08-18 18:49:52,749 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,750 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 235
[2020-08-18 18:49:52,751 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:52,799 INFO  L134       CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked.
[2020-08-18 18:49:52,799 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107863180]
[2020-08-18 18:49:52,799 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:52,799 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50
[2020-08-18 18:49:52,800 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832904900]
[2020-08-18 18:49:52,800 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 50 states
[2020-08-18 18:49:52,800 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:52,801 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants.
[2020-08-18 18:49:52,801 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=1801, Unknown=0, NotChecked=0, Total=2450
[2020-08-18 18:49:52,801 INFO  L87              Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 50 states.
[2020-08-18 18:49:54,330 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:54,330 INFO  L93              Difference]: Finished difference Result 407 states and 493 transitions.
[2020-08-18 18:49:54,330 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. 
[2020-08-18 18:49:54,331 INFO  L78                 Accepts]: Start accepts. Automaton has 50 states. Word has length 247
[2020-08-18 18:49:54,331 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:54,333 INFO  L225             Difference]: With dead ends: 407
[2020-08-18 18:49:54,333 INFO  L226             Difference]: Without dead ends: 304
[2020-08-18 18:49:54,334 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 805 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1573, Invalid=3829, Unknown=0, NotChecked=0, Total=5402
[2020-08-18 18:49:54,335 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 304 states.
[2020-08-18 18:49:54,345 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208.
[2020-08-18 18:49:54,345 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 208 states.
[2020-08-18 18:49:54,346 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions.
[2020-08-18 18:49:54,346 INFO  L78                 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247
[2020-08-18 18:49:54,346 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:54,346 INFO  L479      AbstractCegarLoop]: Abstraction has 208 states and 222 transitions.
[2020-08-18 18:49:54,347 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 50 states.
[2020-08-18 18:49:54,347 INFO  L276                IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions.
[2020-08-18 18:49:54,348 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 250
[2020-08-18 18:49:54,348 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:54,348 INFO  L422         BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:54,348 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36
[2020-08-18 18:49:54,349 INFO  L427      AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:54,349 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:54,349 INFO  L82        PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times
[2020-08-18 18:49:54,349 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:54,349 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944319904]
[2020-08-18 18:49:54,350 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:54,402 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,938 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:54,938 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,939 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:54,940 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,941 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:54,941 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,942 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:54,943 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,944 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:54,944 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,945 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:54,946 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,947 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:54,947 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,948 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:54,949 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,950 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:54,950 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,951 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:54,952 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,953 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:54,954 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,955 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:54,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,956 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:54,956 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,957 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:54,958 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,959 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:49:54,960 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,960 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:49:54,961 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,962 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:49:54,962 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,963 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:49:54,963 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,964 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:49:54,964 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,965 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205
[2020-08-18 18:49:54,965 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,966 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 213
[2020-08-18 18:49:54,967 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,967 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 221
[2020-08-18 18:49:54,968 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,968 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229
[2020-08-18 18:49:54,969 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:54,969 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 237
[2020-08-18 18:49:54,970 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:55,029 INFO  L134       CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked.
[2020-08-18 18:49:55,030 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944319904]
[2020-08-18 18:49:55,030 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:55,030 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29
[2020-08-18 18:49:55,030 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143251367]
[2020-08-18 18:49:55,032 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 29 states
[2020-08-18 18:49:55,032 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:55,032 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants.
[2020-08-18 18:49:55,033 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=457, Unknown=0, NotChecked=0, Total=812
[2020-08-18 18:49:55,033 INFO  L87              Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 29 states.
[2020-08-18 18:49:55,305 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:55,305 INFO  L93              Difference]: Finished difference Result 223 states and 238 transitions.
[2020-08-18 18:49:55,306 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. 
[2020-08-18 18:49:55,306 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states. Word has length 249
[2020-08-18 18:49:55,307 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:55,309 INFO  L225             Difference]: With dead ends: 223
[2020-08-18 18:49:55,309 INFO  L226             Difference]: Without dead ends: 221
[2020-08-18 18:49:55,310 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=359, Invalid=511, Unknown=0, NotChecked=0, Total=870
[2020-08-18 18:49:55,310 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 221 states.
[2020-08-18 18:49:55,321 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220.
[2020-08-18 18:49:55,322 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 220 states.
[2020-08-18 18:49:55,323 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions.
[2020-08-18 18:49:55,323 INFO  L78                 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249
[2020-08-18 18:49:55,324 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:55,324 INFO  L479      AbstractCegarLoop]: Abstraction has 220 states and 235 transitions.
[2020-08-18 18:49:55,325 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 29 states.
[2020-08-18 18:49:55,325 INFO  L276                IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions.
[2020-08-18 18:49:55,327 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 266
[2020-08-18 18:49:55,327 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:55,327 INFO  L422         BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:55,327 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37
[2020-08-18 18:49:55,327 INFO  L427      AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:55,328 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:55,328 INFO  L82        PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times
[2020-08-18 18:49:55,328 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:55,328 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098285709]
[2020-08-18 18:49:55,328 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:55,396 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,693 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:56,694 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,694 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61
[2020-08-18 18:49:56,695 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,695 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:49:56,696 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,697 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:49:56,697 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,698 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:49:56,698 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,699 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:49:56,700 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,700 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:49:56,701 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,701 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:49:56,702 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,703 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:49:56,703 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,704 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:49:56,704 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,705 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:49:56,706 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,706 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:49:56,707 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,708 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:49:56,708 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,709 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:49:56,709 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,710 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:49:56,710 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,711 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:49:56,712 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,713 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:49:56,713 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,714 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:49:56,714 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,715 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:49:56,716 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,716 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205
[2020-08-18 18:49:56,717 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,718 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 213
[2020-08-18 18:49:56,718 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,719 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 221
[2020-08-18 18:49:56,719 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,720 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229
[2020-08-18 18:49:56,721 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,721 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 237
[2020-08-18 18:49:56,722 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,722 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 245
[2020-08-18 18:49:56,723 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,724 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 253
[2020-08-18 18:49:56,724 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:56,773 INFO  L134       CoverageAnalysis]: Checked inductivity of 3100 backedges. 1300 proven. 600 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked.
[2020-08-18 18:49:56,773 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098285709]
[2020-08-18 18:49:56,773 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:56,773 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53
[2020-08-18 18:49:56,773 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585107760]
[2020-08-18 18:49:56,774 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 53 states
[2020-08-18 18:49:56,774 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:56,774 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants.
[2020-08-18 18:49:56,775 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=2028, Unknown=0, NotChecked=0, Total=2756
[2020-08-18 18:49:56,775 INFO  L87              Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 53 states.
[2020-08-18 18:49:58,362 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:49:58,362 INFO  L93              Difference]: Finished difference Result 435 states and 525 transitions.
[2020-08-18 18:49:58,363 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. 
[2020-08-18 18:49:58,363 INFO  L78                 Accepts]: Start accepts. Automaton has 53 states. Word has length 265
[2020-08-18 18:49:58,363 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:49:58,365 INFO  L225             Difference]: With dead ends: 435
[2020-08-18 18:49:58,365 INFO  L226             Difference]: Without dead ends: 322
[2020-08-18 18:49:58,366 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1728, Invalid=4278, Unknown=0, NotChecked=0, Total=6006
[2020-08-18 18:49:58,366 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 322 states.
[2020-08-18 18:49:58,375 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222.
[2020-08-18 18:49:58,375 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 222 states.
[2020-08-18 18:49:58,376 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions.
[2020-08-18 18:49:58,376 INFO  L78                 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265
[2020-08-18 18:49:58,376 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:49:58,377 INFO  L479      AbstractCegarLoop]: Abstraction has 222 states and 237 transitions.
[2020-08-18 18:49:58,377 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 53 states.
[2020-08-18 18:49:58,377 INFO  L276                IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions.
[2020-08-18 18:49:58,378 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 268
[2020-08-18 18:49:58,378 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:49:58,378 INFO  L422         BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:49:58,379 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38
[2020-08-18 18:49:58,379 INFO  L427      AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:49:58,379 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:49:58,379 INFO  L82        PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times
[2020-08-18 18:49:58,379 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:49:58,379 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871717594]
[2020-08-18 18:49:58,379 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:49:58,437 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,790 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:49:59,791 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,791 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63
[2020-08-18 18:49:59,792 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,793 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71
[2020-08-18 18:49:59,794 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,794 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79
[2020-08-18 18:49:59,795 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,795 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87
[2020-08-18 18:49:59,796 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,796 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95
[2020-08-18 18:49:59,797 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,798 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103
[2020-08-18 18:49:59,798 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,799 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111
[2020-08-18 18:49:59,799 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,800 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 119
[2020-08-18 18:49:59,800 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,801 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 127
[2020-08-18 18:49:59,802 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,802 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 135
[2020-08-18 18:49:59,803 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,804 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 143
[2020-08-18 18:49:59,804 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,805 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151
[2020-08-18 18:49:59,805 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,806 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 159
[2020-08-18 18:49:59,807 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,807 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 167
[2020-08-18 18:49:59,808 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,809 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 175
[2020-08-18 18:49:59,809 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,810 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 183
[2020-08-18 18:49:59,810 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,811 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 191
[2020-08-18 18:49:59,812 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,812 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 199
[2020-08-18 18:49:59,813 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,814 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 207
[2020-08-18 18:49:59,814 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,815 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 215
[2020-08-18 18:49:59,815 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,816 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 223
[2020-08-18 18:49:59,817 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,818 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 231
[2020-08-18 18:49:59,818 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,819 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 239
[2020-08-18 18:49:59,819 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 247
[2020-08-18 18:49:59,821 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,821 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 255
[2020-08-18 18:49:59,822 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:49:59,911 INFO  L134       CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked.
[2020-08-18 18:49:59,912 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871717594]
[2020-08-18 18:49:59,912 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:49:59,912 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54
[2020-08-18 18:49:59,912 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145349836]
[2020-08-18 18:49:59,913 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 54 states
[2020-08-18 18:49:59,913 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:49:59,913 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants.
[2020-08-18 18:49:59,913 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862
[2020-08-18 18:49:59,913 INFO  L87              Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 54 states.
[2020-08-18 18:50:01,618 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:50:01,619 INFO  L93              Difference]: Finished difference Result 439 states and 532 transitions.
[2020-08-18 18:50:01,619 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. 
[2020-08-18 18:50:01,619 INFO  L78                 Accepts]: Start accepts. Automaton has 54 states. Word has length 267
[2020-08-18 18:50:01,620 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:50:01,621 INFO  L225             Difference]: With dead ends: 439
[2020-08-18 18:50:01,621 INFO  L226             Difference]: Without dead ends: 328
[2020-08-18 18:50:01,622 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1834, Invalid=4486, Unknown=0, NotChecked=0, Total=6320
[2020-08-18 18:50:01,623 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 328 states.
[2020-08-18 18:50:01,643 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224.
[2020-08-18 18:50:01,643 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 224 states.
[2020-08-18 18:50:01,644 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions.
[2020-08-18 18:50:01,646 INFO  L78                 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267
[2020-08-18 18:50:01,646 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:50:01,646 INFO  L479      AbstractCegarLoop]: Abstraction has 224 states and 239 transitions.
[2020-08-18 18:50:01,646 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 54 states.
[2020-08-18 18:50:01,646 INFO  L276                IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions.
[2020-08-18 18:50:01,648 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 270
[2020-08-18 18:50:01,648 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:50:01,648 INFO  L422         BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:50:01,648 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39
[2020-08-18 18:50:01,648 INFO  L427      AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:50:01,649 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:50:01,649 INFO  L82        PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times
[2020-08-18 18:50:01,649 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:50:01,649 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712314943]
[2020-08-18 18:50:01,649 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:50:01,709 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,271 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:50:02,272 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,273 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:50:02,273 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,274 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:50:02,274 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,275 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:50:02,275 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,276 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:50:02,276 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,276 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:50:02,277 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,277 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:50:02,278 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,278 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:50:02,279 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,279 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:50:02,280 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,281 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:50:02,281 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,282 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:50:02,282 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,283 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:50:02,286 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,286 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:50:02,287 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,288 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:50:02,289 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,289 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:50:02,289 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,290 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:50:02,290 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,292 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 185
[2020-08-18 18:50:02,292 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,293 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193
[2020-08-18 18:50:02,293 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,294 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201
[2020-08-18 18:50:02,294 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,295 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 209
[2020-08-18 18:50:02,295 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,296 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217
[2020-08-18 18:50:02,297 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,297 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 225
[2020-08-18 18:50:02,298 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,299 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 233
[2020-08-18 18:50:02,299 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,300 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 241
[2020-08-18 18:50:02,300 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,301 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 249
[2020-08-18 18:50:02,302 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,302 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 257
[2020-08-18 18:50:02,303 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:02,338 INFO  L134       CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked.
[2020-08-18 18:50:02,338 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712314943]
[2020-08-18 18:50:02,339 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:50:02,339 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31
[2020-08-18 18:50:02,339 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631351654]
[2020-08-18 18:50:02,339 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 31 states
[2020-08-18 18:50:02,339 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:50:02,339 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants.
[2020-08-18 18:50:02,340 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930
[2020-08-18 18:50:02,340 INFO  L87              Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 31 states.
[2020-08-18 18:50:02,655 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:50:02,656 INFO  L93              Difference]: Finished difference Result 239 states and 255 transitions.
[2020-08-18 18:50:02,656 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. 
[2020-08-18 18:50:02,657 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states. Word has length 269
[2020-08-18 18:50:02,657 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:50:02,659 INFO  L225             Difference]: With dead ends: 239
[2020-08-18 18:50:02,661 INFO  L226             Difference]: Without dead ends: 237
[2020-08-18 18:50:02,661 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=414, Invalid=578, Unknown=0, NotChecked=0, Total=992
[2020-08-18 18:50:02,662 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 237 states.
[2020-08-18 18:50:02,672 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 236.
[2020-08-18 18:50:02,672 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 236 states.
[2020-08-18 18:50:02,673 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions.
[2020-08-18 18:50:02,673 INFO  L78                 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269
[2020-08-18 18:50:02,674 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:50:02,674 INFO  L479      AbstractCegarLoop]: Abstraction has 236 states and 252 transitions.
[2020-08-18 18:50:02,674 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 31 states.
[2020-08-18 18:50:02,674 INFO  L276                IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions.
[2020-08-18 18:50:02,676 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 286
[2020-08-18 18:50:02,676 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:50:02,676 INFO  L422         BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:50:02,676 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40
[2020-08-18 18:50:02,676 INFO  L427      AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:50:02,676 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:50:02,676 INFO  L82        PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times
[2020-08-18 18:50:02,677 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:50:02,677 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631308669]
[2020-08-18 18:50:02,677 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:50:02,714 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,153 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:50:04,153 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,154 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-08-18 18:50:04,155 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,156 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73
[2020-08-18 18:50:04,156 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,157 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81
[2020-08-18 18:50:04,157 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,158 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89
[2020-08-18 18:50:04,159 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,159 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97
[2020-08-18 18:50:04,160 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,160 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105
[2020-08-18 18:50:04,161 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,162 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113
[2020-08-18 18:50:04,162 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,163 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121
[2020-08-18 18:50:04,163 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,164 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129
[2020-08-18 18:50:04,164 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,165 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137
[2020-08-18 18:50:04,166 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,166 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145
[2020-08-18 18:50:04,167 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,167 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153
[2020-08-18 18:50:04,168 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,169 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161
[2020-08-18 18:50:04,169 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,170 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169
[2020-08-18 18:50:04,170 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,171 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 177
[2020-08-18 18:50:04,171 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,171 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 185
[2020-08-18 18:50:04,172 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,172 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193
[2020-08-18 18:50:04,173 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,173 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201
[2020-08-18 18:50:04,173 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,174 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 209
[2020-08-18 18:50:04,174 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,175 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217
[2020-08-18 18:50:04,175 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,176 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 225
[2020-08-18 18:50:04,176 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,176 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 233
[2020-08-18 18:50:04,177 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,177 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 241
[2020-08-18 18:50:04,178 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,178 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 249
[2020-08-18 18:50:04,179 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,179 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 257
[2020-08-18 18:50:04,179 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,180 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 265
[2020-08-18 18:50:04,180 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,181 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 273
[2020-08-18 18:50:04,181 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:04,231 INFO  L134       CoverageAnalysis]: Checked inductivity of 3618 backedges. 1512 proven. 702 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked.
[2020-08-18 18:50:04,232 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631308669]
[2020-08-18 18:50:04,232 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:50:04,232 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57
[2020-08-18 18:50:04,232 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141247353]
[2020-08-18 18:50:04,233 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 57 states
[2020-08-18 18:50:04,233 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:50:04,233 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants.
[2020-08-18 18:50:04,233 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=840, Invalid=2352, Unknown=0, NotChecked=0, Total=3192
[2020-08-18 18:50:04,234 INFO  L87              Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 57 states.
[2020-08-18 18:50:06,203 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:50:06,204 INFO  L93              Difference]: Finished difference Result 467 states and 564 transitions.
[2020-08-18 18:50:06,208 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. 
[2020-08-18 18:50:06,208 INFO  L78                 Accepts]: Start accepts. Automaton has 57 states. Word has length 285
[2020-08-18 18:50:06,209 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:50:06,211 INFO  L225             Difference]: With dead ends: 467
[2020-08-18 18:50:06,211 INFO  L226             Difference]: Without dead ends: 346
[2020-08-18 18:50:06,213 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2001, Invalid=4971, Unknown=0, NotChecked=0, Total=6972
[2020-08-18 18:50:06,214 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 346 states.
[2020-08-18 18:50:06,227 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238.
[2020-08-18 18:50:06,227 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 238 states.
[2020-08-18 18:50:06,230 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions.
[2020-08-18 18:50:06,231 INFO  L78                 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285
[2020-08-18 18:50:06,231 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:50:06,231 INFO  L479      AbstractCegarLoop]: Abstraction has 238 states and 254 transitions.
[2020-08-18 18:50:06,231 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 57 states.
[2020-08-18 18:50:06,232 INFO  L276                IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions.
[2020-08-18 18:50:06,233 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 288
[2020-08-18 18:50:06,234 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:50:06,234 INFO  L422         BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:50:06,234 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41
[2020-08-18 18:50:06,234 INFO  L427      AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:50:06,235 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:50:06,236 INFO  L82        PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times
[2020-08-18 18:50:06,236 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:50:06,237 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816229291]
[2020-08-18 18:50:06,237 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:50:06,307 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,858 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:50:07,858 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,859 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67
[2020-08-18 18:50:07,860 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,860 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75
[2020-08-18 18:50:07,861 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,861 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83
[2020-08-18 18:50:07,862 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,862 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-08-18 18:50:07,863 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,863 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99
[2020-08-18 18:50:07,864 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,864 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107
[2020-08-18 18:50:07,865 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,866 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115
[2020-08-18 18:50:07,866 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,867 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 123
[2020-08-18 18:50:07,867 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,868 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131
[2020-08-18 18:50:07,868 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,869 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 139
[2020-08-18 18:50:07,869 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,870 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 147
[2020-08-18 18:50:07,871 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,871 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 155
[2020-08-18 18:50:07,872 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,872 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163
[2020-08-18 18:50:07,873 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,873 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 171
[2020-08-18 18:50:07,874 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,875 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 179
[2020-08-18 18:50:07,875 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,876 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 187
[2020-08-18 18:50:07,876 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,877 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 195
[2020-08-18 18:50:07,878 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,878 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 203
[2020-08-18 18:50:07,879 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,879 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 211
[2020-08-18 18:50:07,880 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,881 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 219
[2020-08-18 18:50:07,881 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,882 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 227
[2020-08-18 18:50:07,882 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,883 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 235
[2020-08-18 18:50:07,884 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,884 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 243
[2020-08-18 18:50:07,885 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,886 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 251
[2020-08-18 18:50:07,886 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,887 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 259
[2020-08-18 18:50:07,887 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,888 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 267
[2020-08-18 18:50:07,888 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,889 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 275
[2020-08-18 18:50:07,890 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:07,941 INFO  L134       CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked.
[2020-08-18 18:50:07,941 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816229291]
[2020-08-18 18:50:07,942 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:50:07,942 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58
[2020-08-18 18:50:07,942 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951119579]
[2020-08-18 18:50:07,942 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 58 states
[2020-08-18 18:50:07,943 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:50:07,943 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants.
[2020-08-18 18:50:07,944 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=869, Invalid=2437, Unknown=0, NotChecked=0, Total=3306
[2020-08-18 18:50:07,944 INFO  L87              Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 58 states.
[2020-08-18 18:50:09,919 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:50:09,919 INFO  L93              Difference]: Finished difference Result 471 states and 571 transitions.
[2020-08-18 18:50:09,919 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. 
[2020-08-18 18:50:09,919 INFO  L78                 Accepts]: Start accepts. Automaton has 58 states. Word has length 287
[2020-08-18 18:50:09,921 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:50:09,922 INFO  L225             Difference]: With dead ends: 471
[2020-08-18 18:50:09,922 INFO  L226             Difference]: Without dead ends: 352
[2020-08-18 18:50:09,924 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1107 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2115, Invalid=5195, Unknown=0, NotChecked=0, Total=7310
[2020-08-18 18:50:09,925 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 352 states.
[2020-08-18 18:50:09,936 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240.
[2020-08-18 18:50:09,937 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 240 states.
[2020-08-18 18:50:09,938 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions.
[2020-08-18 18:50:09,938 INFO  L78                 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287
[2020-08-18 18:50:09,938 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:50:09,940 INFO  L479      AbstractCegarLoop]: Abstraction has 240 states and 256 transitions.
[2020-08-18 18:50:09,940 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 58 states.
[2020-08-18 18:50:09,940 INFO  L276                IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions.
[2020-08-18 18:50:09,942 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 290
[2020-08-18 18:50:09,942 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:50:09,942 INFO  L422         BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:50:09,942 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42
[2020-08-18 18:50:09,942 INFO  L427      AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:50:09,942 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:50:09,943 INFO  L82        PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times
[2020-08-18 18:50:09,943 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:50:09,943 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407949083]
[2020-08-18 18:50:09,943 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:50:09,993 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,606 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:50:10,606 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,607 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:50:10,607 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,609 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:50:10,609 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,610 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:50:10,610 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,611 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:50:10,611 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,613 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:50:10,614 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,615 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:50:10,615 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,616 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:50:10,616 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,617 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:50:10,617 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,618 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:50:10,618 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,619 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:50:10,619 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,620 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:50:10,620 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,621 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:50:10,622 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,622 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:50:10,624 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,624 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:50:10,625 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,626 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:50:10,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,627 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:50:10,627 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,628 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:50:10,628 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,629 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205
[2020-08-18 18:50:10,629 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,630 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 213
[2020-08-18 18:50:10,631 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,632 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 221
[2020-08-18 18:50:10,633 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,633 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229
[2020-08-18 18:50:10,634 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,635 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 237
[2020-08-18 18:50:10,635 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,636 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 245
[2020-08-18 18:50:10,636 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,637 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 253
[2020-08-18 18:50:10,638 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,639 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 261
[2020-08-18 18:50:10,639 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,640 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 269
[2020-08-18 18:50:10,640 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,641 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 277
[2020-08-18 18:50:10,641 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:10,692 INFO  L134       CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked.
[2020-08-18 18:50:10,692 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407949083]
[2020-08-18 18:50:10,693 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:50:10,693 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33
[2020-08-18 18:50:10,693 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446814509]
[2020-08-18 18:50:10,693 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 33 states
[2020-08-18 18:50:10,694 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:50:10,694 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants.
[2020-08-18 18:50:10,694 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=469, Invalid=587, Unknown=0, NotChecked=0, Total=1056
[2020-08-18 18:50:10,694 INFO  L87              Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 33 states.
[2020-08-18 18:50:11,035 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:50:11,035 INFO  L93              Difference]: Finished difference Result 255 states and 272 transitions.
[2020-08-18 18:50:11,036 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. 
[2020-08-18 18:50:11,036 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states. Word has length 289
[2020-08-18 18:50:11,037 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:50:11,038 INFO  L225             Difference]: With dead ends: 255
[2020-08-18 18:50:11,038 INFO  L226             Difference]: Without dead ends: 253
[2020-08-18 18:50:11,038 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=473, Invalid=649, Unknown=0, NotChecked=0, Total=1122
[2020-08-18 18:50:11,039 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 253 states.
[2020-08-18 18:50:11,057 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 252.
[2020-08-18 18:50:11,057 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 252 states.
[2020-08-18 18:50:11,058 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions.
[2020-08-18 18:50:11,058 INFO  L78                 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289
[2020-08-18 18:50:11,058 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:50:11,059 INFO  L479      AbstractCegarLoop]: Abstraction has 252 states and 269 transitions.
[2020-08-18 18:50:11,059 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 33 states.
[2020-08-18 18:50:11,059 INFO  L276                IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions.
[2020-08-18 18:50:11,061 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 306
[2020-08-18 18:50:11,061 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:50:11,061 INFO  L422         BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:50:11,061 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43
[2020-08-18 18:50:11,061 INFO  L427      AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:50:11,061 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:50:11,062 INFO  L82        PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times
[2020-08-18 18:50:11,062 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:50:11,062 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791398145]
[2020-08-18 18:50:11,062 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:50:11,128 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,804 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:50:12,804 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,805 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 18:50:12,806 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,807 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77
[2020-08-18 18:50:12,807 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,808 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85
[2020-08-18 18:50:12,808 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,808 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93
[2020-08-18 18:50:12,809 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,809 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101
[2020-08-18 18:50:12,810 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,811 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-08-18 18:50:12,811 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,811 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117
[2020-08-18 18:50:12,812 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,812 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125
[2020-08-18 18:50:12,813 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,813 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133
[2020-08-18 18:50:12,814 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,814 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141
[2020-08-18 18:50:12,815 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,816 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149
[2020-08-18 18:50:12,816 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,817 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157
[2020-08-18 18:50:12,817 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,817 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 165
[2020-08-18 18:50:12,818 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,818 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 173
[2020-08-18 18:50:12,819 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,819 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181
[2020-08-18 18:50:12,820 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 189
[2020-08-18 18:50:12,820 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,821 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 197
[2020-08-18 18:50:12,821 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,822 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205
[2020-08-18 18:50:12,822 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,823 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 213
[2020-08-18 18:50:12,823 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,823 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 221
[2020-08-18 18:50:12,824 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,824 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229
[2020-08-18 18:50:12,825 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,825 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 237
[2020-08-18 18:50:12,826 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,826 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 245
[2020-08-18 18:50:12,827 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,827 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 253
[2020-08-18 18:50:12,828 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,828 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 261
[2020-08-18 18:50:12,829 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,829 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 269
[2020-08-18 18:50:12,830 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,831 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 277
[2020-08-18 18:50:12,831 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,832 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 285
[2020-08-18 18:50:12,832 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,832 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 293
[2020-08-18 18:50:12,833 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:50:12,899 INFO  L134       CoverageAnalysis]: Checked inductivity of 4176 backedges. 1740 proven. 812 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked.
[2020-08-18 18:50:12,900 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791398145]
[2020-08-18 18:50:12,900 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 18:50:12,900 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61
[2020-08-18 18:50:12,900 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407264947]
[2020-08-18 18:50:12,900 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 61 states
[2020-08-18 18:50:12,900 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:50:12,901 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants.
[2020-08-18 18:50:12,901 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=960, Invalid=2700, Unknown=0, NotChecked=0, Total=3660
[2020-08-18 18:50:12,901 INFO  L87              Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 61 states.