/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:56:47,343 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:56:47,346 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:56:47,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:56:47,385 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:56:47,394 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:56:47,396 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:56:47,399 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:56:47,402 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:56:47,405 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:56:47,406 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:56:47,407 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:56:47,407 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:56:47,410 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:56:47,412 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:56:47,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:56:47,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:56:47,416 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:56:47,417 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:56:47,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:56:47,428 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:56:47,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:56:47,430 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:56:47,430 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:56:47,442 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:56:47,461 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:56:47,462 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:56:47,462 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:56:47,463 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 [2020-08-19 06:56:47,493 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:56:47,493 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:56:47,494 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:56:47,494 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:56:47,495 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:56:47,495 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:56:47,495 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:56:47,495 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:56:47,495 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:56:47,496 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:56:47,497 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:56:47,497 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:56:47,497 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:56:47,497 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:56:47,497 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:56:47,498 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:56:47,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:56:47,498 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:56:47,498 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:56:47,498 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:56:47,498 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:56:47,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:56:47,499 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:56:47,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:56:47,499 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=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:56:47,825 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:56:47,845 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:56:47,849 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:56:47,851 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:56:47,852 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:56:47,853 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 06:56:47,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9d37148af/5d048ba93713412b87d73b475b250937/FLAGa47013b4f [2020-08-19 06:56:48,330 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:56:48,331 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 06:56:48,336 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9d37148af/5d048ba93713412b87d73b475b250937/FLAGa47013b4f [2020-08-19 06:56:48,706 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9d37148af/5d048ba93713412b87d73b475b250937 [2020-08-19 06:56:48,714 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:56:48,716 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:56:48,717 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:48,717 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:56:48,720 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:56:48,721 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18cc86df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48, skipping insertion in model container [2020-08-19 06:56:48,724 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:56:48,752 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:56:48,920 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:48,926 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:56:48,943 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:48,959 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:56:48,959 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48 WrapperNode [2020-08-19 06:56:48,959 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:48,960 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:56:48,960 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:56:48,960 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:56:48,975 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,975 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,980 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,980 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,984 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,990 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (1/1) ... [2020-08-19 06:56:48,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:56:48,993 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:56:48,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:56:48,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:56:48,995 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (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 [2020-08-19 06:56:49,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:56:49,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:56:49,165 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:56:49,166 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:56:49,166 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:56:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:56:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:56:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:56:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:56:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:56:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:56:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:56:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:56:49,474 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:56:49,474 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 06:56:49,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:49 BoogieIcfgContainer [2020-08-19 06:56:49,478 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:56:49,479 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:56:49,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:56:49,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:56:49,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:56:48" (1/3) ... [2020-08-19 06:56:49,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3110cd8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:49, skipping insertion in model container [2020-08-19 06:56:49,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:48" (2/3) ... [2020-08-19 06:56:49,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3110cd8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:49, skipping insertion in model container [2020-08-19 06:56:49,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:49" (3/3) ... [2020-08-19 06:56:49,486 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-19 06:56:49,497 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:56:49,504 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:56:49,516 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:56:49,541 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:56:49,541 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:56:49,541 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:56:49,542 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:56:49,542 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:56:49,542 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:56:49,542 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:56:49,542 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:56:49,563 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 06:56:49,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:56:49,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,570 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,571 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-19 06:56:49,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242998809] [2020-08-19 06:56:49,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242998809] [2020-08-19 06:56:49,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:49,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 06:56:49,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432880529] [2020-08-19 06:56:49,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 06:56:49,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 06:56:49,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 06:56:49,739 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-19 06:56:49,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:49,762 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-19 06:56:49,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 06:56:49,764 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 06:56:49,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:49,772 INFO L225 Difference]: With dead ends: 37 [2020-08-19 06:56:49,773 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 06:56:49,776 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 [2020-08-19 06:56:49,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 06:56:49,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 06:56:49,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 06:56:49,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-19 06:56:49,809 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-19 06:56:49,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:49,810 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-19 06:56:49,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 06:56:49,810 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-19 06:56:49,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:56:49,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:56:49,816 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-19 06:56:49,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99251693] [2020-08-19 06:56:49,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:49,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99251693] [2020-08-19 06:56:49,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:49,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:56:49,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115654852] [2020-08-19 06:56:49,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:56:49,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:56:49,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:56:49,863 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-19 06:56:49,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:49,893 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-19 06:56:49,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:56:49,894 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 06:56:49,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:49,895 INFO L225 Difference]: With dead ends: 20 [2020-08-19 06:56:49,895 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 06:56:49,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:56:49,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 06:56:49,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 06:56:49,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 06:56:49,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 06:56:49,903 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-19 06:56:49,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:49,903 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 06:56:49,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:56:49,904 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 06:56:49,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 06:56:49,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,905 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:56:49,905 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,906 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-19 06:56:49,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086371473] [2020-08-19 06:56:49,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:49,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086371473] [2020-08-19 06:56:49,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:49,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:56:49,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660679255] [2020-08-19 06:56:49,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:56:49,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:56:49,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:56:49,951 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 06:56:49,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:49,967 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-19 06:56:49,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:56:49,968 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-19 06:56:49,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:49,968 INFO L225 Difference]: With dead ends: 25 [2020-08-19 06:56:49,969 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 06:56:49,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:56:49,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 06:56:49,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 06:56:49,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 06:56:49,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 06:56:49,974 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-19 06:56:49,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:49,975 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 06:56:49,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:56:49,975 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 06:56:49,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 06:56:49,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,976 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:56:49,977 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,977 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-19 06:56:49,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165284098] [2020-08-19 06:56:49,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:49,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165284098] [2020-08-19 06:56:50,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 06:56:50,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13922401] [2020-08-19 06:56:50,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:56:50,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:56:50,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:56:50,041 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-19 06:56:50,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,115 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-19 06:56:50,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:56:50,116 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-19 06:56:50,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,117 INFO L225 Difference]: With dead ends: 26 [2020-08-19 06:56:50,117 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 06:56:50,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:56:50,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 06:56:50,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 06:56:50,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 06:56:50,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 06:56:50,124 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-19 06:56:50,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,124 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 06:56:50,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:56:50,125 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 06:56:50,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 06:56:50,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,126 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:56:50,126 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,127 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-19 06:56:50,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382070413] [2020-08-19 06:56:50,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,200 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382070413] [2020-08-19 06:56:50,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:56:50,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13650963] [2020-08-19 06:56:50,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:56:50,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:56:50,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:56:50,203 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-19 06:56:50,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,285 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 06:56:50,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:56:50,286 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 06:56:50,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,287 INFO L225 Difference]: With dead ends: 27 [2020-08-19 06:56:50,287 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 06:56:50,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:56:50,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 06:56:50,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 06:56:50,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 06:56:50,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 06:56:50,294 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-19 06:56:50,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,294 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 06:56:50,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:56:50,295 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 06:56:50,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 06:56:50,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,296 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:56:50,296 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,297 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-19 06:56:50,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467250515] [2020-08-19 06:56:50,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,416 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467250515] [2020-08-19 06:56:50,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:56:50,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062762224] [2020-08-19 06:56:50,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:56:50,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:56:50,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:56:50,420 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-19 06:56:50,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,549 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-19 06:56:50,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:56:50,549 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-19 06:56:50,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,551 INFO L225 Difference]: With dead ends: 28 [2020-08-19 06:56:50,551 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 06:56:50,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:56:50,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 06:56:50,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 06:56:50,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 06:56:50,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-19 06:56:50,558 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-19 06:56:50,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,559 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-19 06:56:50,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:56:50,559 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-19 06:56:50,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 06:56:50,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,560 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:56:50,561 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-19 06:56:50,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701069553] [2020-08-19 06:56:50,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,775 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701069553] [2020-08-19 06:56:50,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:56:50,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129912750] [2020-08-19 06:56:50,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:56:50,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:56:50,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:56:50,778 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-19 06:56:50,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,951 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 06:56:50,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:56:50,952 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-19 06:56:50,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,953 INFO L225 Difference]: With dead ends: 29 [2020-08-19 06:56:50,954 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 06:56:50,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:56:50,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 06:56:50,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 06:56:50,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 06:56:50,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 06:56:50,962 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-19 06:56:50,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,963 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 06:56:50,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:56:50,968 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 06:56:50,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:56:50,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,969 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:56:50,970 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-19 06:56:50,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171956973] [2020-08-19 06:56:50,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,089 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:51,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171956973] [2020-08-19 06:56:51,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:56:51,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782932221] [2020-08-19 06:56:51,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:56:51,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:56:51,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:56:51,092 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-19 06:56:51,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,267 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 06:56:51,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:56:51,268 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 06:56:51,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,269 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:56:51,269 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 06:56:51,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:56:51,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 06:56:51,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 06:56:51,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 06:56:51,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-19 06:56:51,275 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-19 06:56:51,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,276 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-19 06:56:51,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:56:51,276 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-19 06:56:51,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 06:56:51,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,277 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:56:51,277 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,278 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-19 06:56:51,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640086096] [2020-08-19 06:56:51,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,309 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:51,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640086096] [2020-08-19 06:56:51,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 06:56:51,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701955510] [2020-08-19 06:56:51,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:56:51,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:56:51,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:56:51,311 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-19 06:56:51,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,325 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-19 06:56:51,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:56:51,326 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 06:56:51,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,327 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:56:51,327 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 06:56:51,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:56:51,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 06:56:51,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 06:56:51,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 06:56:51,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-19 06:56:51,333 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-19 06:56:51,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,334 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-19 06:56:51,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:56:51,334 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-19 06:56:51,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 06:56:51,335 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,335 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:56:51,335 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,336 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-19 06:56:51,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618744681] [2020-08-19 06:56:51,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,373 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:51,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618744681] [2020-08-19 06:56:51,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 06:56:51,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095525726] [2020-08-19 06:56:51,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:56:51,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:56:51,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:56:51,376 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-19 06:56:51,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,395 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-19 06:56:51,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:56:51,396 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-19 06:56:51,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,397 INFO L225 Difference]: With dead ends: 34 [2020-08-19 06:56:51,397 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 06:56:51,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:56:51,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 06:56:51,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 06:56:51,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:56:51,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-19 06:56:51,404 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-19 06:56:51,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,404 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-19 06:56:51,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:56:51,405 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-19 06:56:51,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:56:51,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,406 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:56:51,406 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-19 06:56:51,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402936213] [2020-08-19 06:56:51,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,451 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:51,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402936213] [2020-08-19 06:56:51,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:56:51,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438422697] [2020-08-19 06:56:51,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:56:51,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:56:51,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:56:51,454 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-19 06:56:51,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,477 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-19 06:56:51,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:56:51,477 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-19 06:56:51,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,478 INFO L225 Difference]: With dead ends: 38 [2020-08-19 06:56:51,478 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 06:56:51,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:56:51,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 06:56:51,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 06:56:51,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:56:51,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 06:56:51,485 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-19 06:56:51,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,486 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 06:56:51,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:56:51,486 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 06:56:51,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 06:56:51,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,487 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:56:51,488 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,488 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-19 06:56:51,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849357833] [2020-08-19 06:56:51,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,579 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:51,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849357833] [2020-08-19 06:56:51,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:56:51,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737079046] [2020-08-19 06:56:51,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:56:51,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:56:51,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:51,582 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-19 06:56:51,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,794 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-19 06:56:51,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:56:51,794 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-19 06:56:51,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,795 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:56:51,795 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 06:56:51,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:56:51,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 06:56:51,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 06:56:51,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 06:56:51,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 06:56:51,803 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-19 06:56:51,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,803 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 06:56:51,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:56:51,803 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 06:56:51,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 06:56:51,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,804 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:56:51,805 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-19 06:56:51,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299979487] [2020-08-19 06:56:51,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:51,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299979487] [2020-08-19 06:56:51,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:56:51,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80700231] [2020-08-19 06:56:51,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:56:51,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:56:51,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:56:51,945 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-19 06:56:52,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:52,178 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-19 06:56:52,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:56:52,179 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-19 06:56:52,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:52,179 INFO L225 Difference]: With dead ends: 55 [2020-08-19 06:56:52,180 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 06:56:52,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:56:52,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 06:56:52,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 06:56:52,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 06:56:52,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-19 06:56:52,187 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-19 06:56:52,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:52,187 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-19 06:56:52,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:56:52,187 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-19 06:56:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 06:56:52,188 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:52,188 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:52,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:56:52,189 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:52,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:52,189 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-19 06:56:52,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:52,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192397857] [2020-08-19 06:56:52,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:52,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:52,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,345 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:52,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192397857] [2020-08-19 06:56:52,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:52,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:56:52,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55449892] [2020-08-19 06:56:52,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:56:52,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:52,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:56:52,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:56:52,347 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-19 06:56:52,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:52,601 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-19 06:56:52,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:56:52,601 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 06:56:52,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:52,602 INFO L225 Difference]: With dead ends: 56 [2020-08-19 06:56:52,602 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 06:56:52,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:56:52,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 06:56:52,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 06:56:52,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 06:56:52,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-19 06:56:52,615 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-19 06:56:52,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:52,616 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-19 06:56:52,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:56:52,616 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-19 06:56:52,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 06:56:52,617 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:52,617 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:52,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:56:52,617 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:52,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:52,619 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-19 06:56:52,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:52,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558982160] [2020-08-19 06:56:52,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:52,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:52,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,795 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:52,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558982160] [2020-08-19 06:56:52,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:52,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:56:52,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38647392] [2020-08-19 06:56:52,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:56:52,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:52,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:56:52,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:56:52,797 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-19 06:56:53,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:53,082 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-19 06:56:53,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:56:53,082 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-19 06:56:53,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:53,083 INFO L225 Difference]: With dead ends: 57 [2020-08-19 06:56:53,083 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 06:56:53,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:56:53,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 06:56:53,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 06:56:53,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 06:56:53,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-19 06:56:53,090 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-19 06:56:53,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:53,091 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-19 06:56:53,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:56:53,091 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-19 06:56:53,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 06:56:53,092 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:53,092 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:53,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 06:56:53,092 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:53,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:53,093 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-19 06:56:53,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:53,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069059420] [2020-08-19 06:56:53,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:53,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:53,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,225 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:53,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069059420] [2020-08-19 06:56:53,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:53,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:56:53,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938846042] [2020-08-19 06:56:53,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:56:53,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:53,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:56:53,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:56:53,227 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-19 06:56:53,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:53,621 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-19 06:56:53,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 06:56:53,622 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 06:56:53,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:53,622 INFO L225 Difference]: With dead ends: 58 [2020-08-19 06:56:53,623 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 06:56:53,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:56:53,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 06:56:53,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 06:56:53,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 06:56:53,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-19 06:56:53,637 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-19 06:56:53,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:53,637 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-19 06:56:53,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:56:53,637 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-19 06:56:53,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 06:56:53,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:53,640 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:53,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 06:56:53,640 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:53,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:53,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-19 06:56:53,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:53,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1090328108] [2020-08-19 06:56:53,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:53,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:53,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,815 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:53,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1090328108] [2020-08-19 06:56:53,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:53,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:56:53,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3974592] [2020-08-19 06:56:53,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:56:53,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:53,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:56:53,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:56:53,818 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-19 06:56:54,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:54,219 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-19 06:56:54,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:56:54,220 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 06:56:54,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:54,221 INFO L225 Difference]: With dead ends: 59 [2020-08-19 06:56:54,221 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 06:56:54,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:56:54,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 06:56:54,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 06:56:54,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 06:56:54,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-19 06:56:54,228 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-19 06:56:54,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:54,229 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-19 06:56:54,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:56:54,229 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-19 06:56:54,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 06:56:54,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:54,230 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:54,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 06:56:54,231 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:54,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:54,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-19 06:56:54,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:54,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478965753] [2020-08-19 06:56:54,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:54,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:54,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:54,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:54,407 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:54,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478965753] [2020-08-19 06:56:54,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:54,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 06:56:54,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493877370] [2020-08-19 06:56:54,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 06:56:54,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:54,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 06:56:54,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:56:54,409 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-19 06:56:54,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:54,874 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-19 06:56:54,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:56:54,875 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 06:56:54,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:54,876 INFO L225 Difference]: With dead ends: 60 [2020-08-19 06:56:54,876 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 06:56:54,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:56:54,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 06:56:54,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 06:56:54,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 06:56:54,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-19 06:56:54,884 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-19 06:56:54,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:54,884 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-19 06:56:54,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 06:56:54,885 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-19 06:56:54,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 06:56:54,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:54,885 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:54,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 06:56:54,886 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:54,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:54,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-19 06:56:54,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:54,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776648386] [2020-08-19 06:56:54,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:54,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:55,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,122 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:55,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776648386] [2020-08-19 06:56:55,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:55,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:56:55,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684078483] [2020-08-19 06:56:55,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:56:55,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:55,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:56:55,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:56:55,129 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-19 06:56:55,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:55,642 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-19 06:56:55,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:56:55,643 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-19 06:56:55,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:55,644 INFO L225 Difference]: With dead ends: 61 [2020-08-19 06:56:55,644 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 06:56:55,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:56:55,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 06:56:55,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 06:56:55,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:56:55,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-19 06:56:55,653 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-19 06:56:55,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:55,654 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-19 06:56:55,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:56:55,654 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-19 06:56:55,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 06:56:55,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:55,655 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:55,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 06:56:55,655 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:55,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:55,655 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-19 06:56:55,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:55,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166845378] [2020-08-19 06:56:55,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:55,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:55,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,870 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:55,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166845378] [2020-08-19 06:56:55,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:55,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 06:56:55,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623808265] [2020-08-19 06:56:55,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 06:56:55,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:55,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 06:56:55,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:56:55,872 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-19 06:56:56,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:56,480 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-19 06:56:56,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 06:56:56,486 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 06:56:56,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:56,487 INFO L225 Difference]: With dead ends: 62 [2020-08-19 06:56:56,487 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 06:56:56,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:56:56,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 06:56:56,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 06:56:56,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 06:56:56,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-19 06:56:56,501 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-19 06:56:56,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:56,501 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-19 06:56:56,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 06:56:56,502 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-19 06:56:56,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 06:56:56,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:56,503 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:56,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 06:56:56,504 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:56,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:56,504 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-19 06:56:56,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:56,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611309509] [2020-08-19 06:56:56,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:56,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:56,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:56,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:56,763 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:56,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611309509] [2020-08-19 06:56:56,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:56,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:56:56,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285204987] [2020-08-19 06:56:56,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:56:56,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:56,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:56:56,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:56:56,765 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-19 06:56:57,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:57,416 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 06:56:57,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:56:57,417 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-19 06:56:57,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:57,418 INFO L225 Difference]: With dead ends: 63 [2020-08-19 06:56:57,418 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 06:56:57,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:56:57,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 06:56:57,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 06:56:57,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 06:56:57,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-19 06:56:57,424 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-19 06:56:57,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:57,425 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-19 06:56:57,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:56:57,425 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-19 06:56:57,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:56:57,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:57,425 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:57,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 06:56:57,426 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:57,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:57,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-19 06:56:57,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:57,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625327097] [2020-08-19 06:56:57,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:57,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,708 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:57,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625327097] [2020-08-19 06:56:57,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:57,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 06:56:57,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141904810] [2020-08-19 06:56:57,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 06:56:57,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:57,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 06:56:57,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:56:57,711 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-19 06:56:58,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:58,433 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-19 06:56:58,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 06:56:58,436 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-19 06:56:58,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:58,437 INFO L225 Difference]: With dead ends: 64 [2020-08-19 06:56:58,437 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:56:58,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:56:58,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:56:58,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 06:56:58,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 06:56:58,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-19 06:56:58,445 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-19 06:56:58,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:58,445 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-19 06:56:58,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 06:56:58,445 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-19 06:56:58,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 06:56:58,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:58,446 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:58,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 06:56:58,447 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:58,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:58,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-19 06:56:58,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:58,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997855500] [2020-08-19 06:56:58,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:58,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:58,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:58,775 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:58,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997855500] [2020-08-19 06:56:58,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:58,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:56:58,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540326640] [2020-08-19 06:56:58,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:56:58,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:58,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:56:58,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:56:58,778 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-19 06:56:59,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:59,554 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-19 06:56:59,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:56:59,554 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-19 06:56:59,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:59,555 INFO L225 Difference]: With dead ends: 65 [2020-08-19 06:56:59,556 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 06:56:59,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:56:59,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 06:56:59,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 06:56:59,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 06:56:59,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-19 06:56:59,565 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-19 06:56:59,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:59,565 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-19 06:56:59,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:56:59,566 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-19 06:56:59,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 06:56:59,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:59,566 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:59,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 06:56:59,567 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:59,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:59,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-19 06:56:59,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:59,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549926230] [2020-08-19 06:56:59,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:59,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:59,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,859 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:56:59,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549926230] [2020-08-19 06:56:59,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:59,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 06:56:59,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642933964] [2020-08-19 06:56:59,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 06:56:59,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:59,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 06:56:59,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:56:59,862 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-19 06:57:00,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:00,764 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 06:57:00,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 06:57:00,765 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-19 06:57:00,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:00,766 INFO L225 Difference]: With dead ends: 66 [2020-08-19 06:57:00,766 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 06:57:00,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:57:00,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 06:57:00,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 06:57:00,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 06:57:00,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-19 06:57:00,775 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-19 06:57:00,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:00,775 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-19 06:57:00,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 06:57:00,775 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-19 06:57:00,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 06:57:00,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:00,776 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:00,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 06:57:00,776 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:00,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:00,777 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-19 06:57:00,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:00,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819917942] [2020-08-19 06:57:00,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:00,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:01,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:01,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:01,155 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:57:01,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819917942] [2020-08-19 06:57:01,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:01,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:57:01,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307293844] [2020-08-19 06:57:01,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:57:01,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:01,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:57:01,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:57:01,158 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-19 06:57:02,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:02,177 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-19 06:57:02,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:57:02,177 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-19 06:57:02,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:02,178 INFO L225 Difference]: With dead ends: 67 [2020-08-19 06:57:02,178 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 06:57:02,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:57:02,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 06:57:02,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 06:57:02,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 06:57:02,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-19 06:57:02,186 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-19 06:57:02,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:02,187 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-19 06:57:02,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:57:02,187 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-19 06:57:02,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 06:57:02,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:02,188 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:02,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 06:57:02,188 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:02,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:02,188 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-19 06:57:02,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:02,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434537223] [2020-08-19 06:57:02,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:02,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:02,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,541 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:57:02,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434537223] [2020-08-19 06:57:02,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:02,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 06:57:02,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952084604] [2020-08-19 06:57:02,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 06:57:02,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:02,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 06:57:02,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:57:02,544 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-19 06:57:03,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:03,661 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-19 06:57:03,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 06:57:03,663 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-19 06:57:03,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:03,664 INFO L225 Difference]: With dead ends: 68 [2020-08-19 06:57:03,664 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 06:57:03,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:57:03,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 06:57:03,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 06:57:03,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 06:57:03,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-19 06:57:03,671 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-19 06:57:03,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:03,671 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-19 06:57:03,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 06:57:03,672 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-19 06:57:03,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 06:57:03,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:03,672 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:03,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 06:57:03,672 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:03,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:03,673 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-19 06:57:03,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:03,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847347998] [2020-08-19 06:57:03,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:03,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:04,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:04,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:04,116 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:57:04,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847347998] [2020-08-19 06:57:04,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:04,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:57:04,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751614259] [2020-08-19 06:57:04,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:57:04,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:04,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:57:04,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:57:04,118 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-19 06:57:05,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:05,295 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-19 06:57:05,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:57:05,295 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-19 06:57:05,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:05,296 INFO L225 Difference]: With dead ends: 69 [2020-08-19 06:57:05,297 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 06:57:05,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 06:57:05,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 06:57:05,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 06:57:05,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:57:05,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-19 06:57:05,305 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-19 06:57:05,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:05,306 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-19 06:57:05,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:57:05,306 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-19 06:57:05,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 06:57:05,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:05,307 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:05,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 06:57:05,307 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:05,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:05,307 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-19 06:57:05,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:05,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346045259] [2020-08-19 06:57:05,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:05,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:05,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:05,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-19 06:57:05,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346045259] [2020-08-19 06:57:05,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:57:05,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:57:05,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432940391] [2020-08-19 06:57:05,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:57:05,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:05,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:57:05,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:57:05,363 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-19 06:57:05,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:05,386 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 06:57:05,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:57:05,387 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-19 06:57:05,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:05,387 INFO L225 Difference]: With dead ends: 66 [2020-08-19 06:57:05,387 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 06:57:05,388 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 [2020-08-19 06:57:05,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 06:57:05,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 06:57:05,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 06:57:05,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 06:57:05,389 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-19 06:57:05,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:05,389 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 06:57:05,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:57:05,389 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 06:57:05,389 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 06:57:05,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 06:57:05,391 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 06:57:05,632 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-19 06:57:05,636 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 06:57:05,636 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:57:05,636 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:57:05,636 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 06:57:05,636 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 06:57:05,636 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-19 06:57:05,637 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-19 06:57:05,637 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 06:57:05,638 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-19 06:57:05,638 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 06:57:05,638 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-19 06:57:05,638 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-19 06:57:05,654 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 06:57:05 BoogieIcfgContainer [2020-08-19 06:57:05,654 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 06:57:05,656 INFO L168 Benchmark]: Toolchain (without parser) took 16940.14 ms. Allocated memory was 148.4 MB in the beginning and 349.7 MB in the end (delta: 201.3 MB). Free memory was 105.0 MB in the beginning and 239.4 MB in the end (delta: -134.4 MB). Peak memory consumption was 66.9 MB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,656 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,657 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.19 ms. Allocated memory is still 148.4 MB. Free memory was 104.6 MB in the beginning and 95.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,657 INFO L168 Benchmark]: Boogie Preprocessor took 32.89 ms. Allocated memory is still 148.4 MB. Free memory was 95.3 MB in the beginning and 93.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,658 INFO L168 Benchmark]: RCFGBuilder took 484.90 ms. Allocated memory was 148.4 MB in the beginning and 204.5 MB in the end (delta: 56.1 MB). Free memory was 93.7 MB in the beginning and 171.3 MB in the end (delta: -77.6 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,659 INFO L168 Benchmark]: TraceAbstraction took 16174.81 ms. Allocated memory was 204.5 MB in the beginning and 349.7 MB in the end (delta: 145.2 MB). Free memory was 170.6 MB in the beginning and 239.4 MB in the end (delta: -68.8 MB). Peak memory consumption was 76.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:57:05,662 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.19 ms. Allocated memory is still 148.4 MB. Free memory was 104.6 MB in the beginning and 95.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.89 ms. Allocated memory is still 148.4 MB. Free memory was 95.3 MB in the beginning and 93.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 484.90 ms. Allocated memory was 148.4 MB in the beginning and 204.5 MB in the end (delta: 56.1 MB). Free memory was 93.7 MB in the beginning and 171.3 MB in the end (delta: -77.6 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16174.81 ms. Allocated memory was 204.5 MB in the beginning and 349.7 MB in the end (delta: 145.2 MB). Free memory was 170.6 MB in the beginning and 239.4 MB in the end (delta: -68.8 MB). Peak memory consumption was 76.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.8s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.2s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...