/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:24:11,428 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:24:11,434 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:24:11,469 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:24:11,470 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:24:11,477 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:24:11,478 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:24:11,482 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:24:11,484 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:24:11,487 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:24:11,489 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:24:11,490 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:24:11,491 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:24:11,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:24:11,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:24:11,497 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:24:11,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:24:11,499 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:24:11,501 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:24:11,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:24:11,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:24:11,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:24:11,510 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:24:11,511 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:24:11,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:24:11,540 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:24:11,541 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:24:11,541 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:24:11,542 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 16:24:11,579 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:24:11,579 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:24:11,581 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:24:11,581 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:24:11,582 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:24:11,582 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:24:11,582 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:24:11,582 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:24:11,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:24:11,583 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:24:11,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:24:11,584 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:24:11,584 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:24:11,585 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:24:11,585 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:24:11,585 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:24:11,585 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:24:11,585 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:24:11,585 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:24:11,586 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:24:11,586 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:24:11,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:11,587 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:24:11,587 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:24:11,587 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:24:11,587 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:24:11,587 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:24:11,587 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:24:11,588 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:24:11,588 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 [2020-08-18 16:24:11,879 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:24:11,891 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:24:11,894 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:24:11,896 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:24:11,896 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:24:11,897 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 16:24:11,960 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ee556c15/977de3b5f9fb43a7a74a9be8d97d8380/FLAG365f3a0e7 [2020-08-18 16:24:12,388 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:24:12,389 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 16:24:12,396 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ee556c15/977de3b5f9fb43a7a74a9be8d97d8380/FLAG365f3a0e7 [2020-08-18 16:24:12,779 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ee556c15/977de3b5f9fb43a7a74a9be8d97d8380 [2020-08-18 16:24:12,790 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:24:12,792 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:24:12,793 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:12,794 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:24:12,797 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:24:12,799 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:12" (1/1) ... [2020-08-18 16:24:12,802 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c1a52a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:12, skipping insertion in model container [2020-08-18 16:24:12,802 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:24:12" (1/1) ... [2020-08-18 16:24:12,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:24:12,828 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:24:13,065 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:13,071 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:24:13,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:24:13,108 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:24:13,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13 WrapperNode [2020-08-18 16:24:13,109 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:24:13,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:24:13,110 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:24:13,110 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:24:13,120 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,120 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,125 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,126 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,213 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,219 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... [2020-08-18 16:24:13,221 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:24:13,221 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:24:13,221 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:24:13,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:24:13,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:24:13,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:24:13,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:24:13,291 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:24:13,291 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:24:13,292 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:24:13,292 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:24:13,292 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:24:13,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:24:13,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:24:13,480 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:24:13,480 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 16:24:13,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:13 BoogieIcfgContainer [2020-08-18 16:24:13,485 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:24:13,486 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:24:13,486 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:24:13,489 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:24:13,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:24:12" (1/3) ... [2020-08-18 16:24:13,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d575902 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:13, skipping insertion in model container [2020-08-18 16:24:13,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:24:13" (2/3) ... [2020-08-18 16:24:13,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d575902 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:24:13, skipping insertion in model container [2020-08-18 16:24:13,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:24:13" (3/3) ... [2020-08-18 16:24:13,493 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-18 16:24:13,503 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:24:13,511 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:24:13,522 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:24:13,546 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:24:13,547 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:24:13,547 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:24:13,547 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:24:13,547 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:24:13,547 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:24:13,547 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:24:13,548 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:24:13,564 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 16:24:13,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 16:24:13,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:13,570 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:13,570 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:13,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:13,576 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 16:24:13,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:13,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103420527] [2020-08-18 16:24:13,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:13,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:13,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:13,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:13,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103420527] [2020-08-18 16:24:13,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:24:13,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 16:24:13,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370812331] [2020-08-18 16:24:13,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 16:24:13,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:13,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 16:24:13,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 16:24:13,866 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 16:24:13,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:13,910 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 16:24:13,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:24:13,913 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 16:24:13,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:13,923 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:13,924 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 16:24:13,928 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 [2020-08-18 16:24:13,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 16:24:13,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 16:24:13,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 16:24:13,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 16:24:13,964 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 16:24:13,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:13,964 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 16:24:13,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 16:24:13,965 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 16:24:13,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 16:24:13,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:13,966 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:13,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:24:13,966 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:13,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:13,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 16:24:13,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:13,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929121023] [2020-08-18 16:24:13,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:13,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929121023] [2020-08-18 16:24:14,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 16:24:14,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836612632] [2020-08-18 16:24:14,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:24:14,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:24:14,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:24:14,067 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 16:24:14,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,089 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 16:24:14,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:24:14,089 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 16:24:14,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,090 INFO L225 Difference]: With dead ends: 18 [2020-08-18 16:24:14,091 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 16:24:14,092 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 [2020-08-18 16:24:14,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 16:24:14,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 16:24:14,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 16:24:14,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 16:24:14,097 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 16:24:14,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,097 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 16:24:14,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:24:14,098 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 16:24:14,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 16:24:14,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,099 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:24:14,099 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 16:24:14,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573272739] [2020-08-18 16:24:14,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573272739] [2020-08-18 16:24:14,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 16:24:14,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092877049] [2020-08-18 16:24:14,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:24:14,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:24:14,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:14,210 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 16:24:14,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,234 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 16:24:14,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:24:14,235 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 16:24:14,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,236 INFO L225 Difference]: With dead ends: 19 [2020-08-18 16:24:14,236 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 16:24:14,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:24:14,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 16:24:14,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 16:24:14,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 16:24:14,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 16:24:14,242 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 16:24:14,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,243 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 16:24:14,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:24:14,243 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 16:24:14,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 16:24:14,244 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,244 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:24:14,245 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 16:24:14,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543082905] [2020-08-18 16:24:14,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,358 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543082905] [2020-08-18 16:24:14,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:24:14,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755425039] [2020-08-18 16:24:14,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:24:14,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:24:14,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:14,361 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 16:24:14,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,390 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 16:24:14,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:24:14,391 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 16:24:14,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,392 INFO L225 Difference]: With dead ends: 20 [2020-08-18 16:24:14,392 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 16:24:14,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:24:14,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 16:24:14,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 16:24:14,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 16:24:14,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 16:24:14,399 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 16:24:14,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,399 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 16:24:14,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:24:14,400 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 16:24:14,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 16:24:14,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,400 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:24:14,401 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 16:24:14,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207610154] [2020-08-18 16:24:14,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,529 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207610154] [2020-08-18 16:24:14,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:24:14,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527220770] [2020-08-18 16:24:14,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:24:14,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:24:14,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:14,532 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 16:24:14,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,572 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 16:24:14,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:24:14,573 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 16:24:14,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,575 INFO L225 Difference]: With dead ends: 21 [2020-08-18 16:24:14,575 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 16:24:14,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:24:14,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 16:24:14,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 16:24:14,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 16:24:14,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 16:24:14,582 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 16:24:14,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,583 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 16:24:14,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:24:14,583 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 16:24:14,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 16:24:14,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,585 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:24:14,585 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 16:24:14,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515631465] [2020-08-18 16:24:14,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,746 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515631465] [2020-08-18 16:24:14,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:24:14,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088334681] [2020-08-18 16:24:14,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:24:14,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:24:14,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:14,750 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 16:24:14,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:14,796 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 16:24:14,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:24:14,797 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 16:24:14,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:14,798 INFO L225 Difference]: With dead ends: 22 [2020-08-18 16:24:14,798 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 16:24:14,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:24:14,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 16:24:14,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 16:24:14,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 16:24:14,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 16:24:14,804 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 16:24:14,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:14,804 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 16:24:14,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:24:14,805 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 16:24:14,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 16:24:14,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:14,806 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:14,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:24:14,806 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:14,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:14,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 16:24:14,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:14,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364423069] [2020-08-18 16:24:14,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:14,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:14,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:14,963 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:14,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364423069] [2020-08-18 16:24:14,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:14,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:24:14,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197929612] [2020-08-18 16:24:14,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:24:14,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:14,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:24:14,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:14,965 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 16:24:15,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:15,016 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 16:24:15,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:24:15,017 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 16:24:15,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:15,017 INFO L225 Difference]: With dead ends: 23 [2020-08-18 16:24:15,018 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 16:24:15,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:24:15,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 16:24:15,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 16:24:15,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 16:24:15,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 16:24:15,024 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 16:24:15,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:15,024 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 16:24:15,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:24:15,025 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 16:24:15,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 16:24:15,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:15,025 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:15,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:24:15,026 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:15,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:15,026 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 16:24:15,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:15,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679022709] [2020-08-18 16:24:15,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:15,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:15,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,177 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:15,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679022709] [2020-08-18 16:24:15,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:15,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:24:15,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550625073] [2020-08-18 16:24:15,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:24:15,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:15,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:24:15,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:15,180 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 16:24:15,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:15,238 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 16:24:15,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:24:15,239 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 16:24:15,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:15,239 INFO L225 Difference]: With dead ends: 24 [2020-08-18 16:24:15,240 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 16:24:15,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:24:15,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 16:24:15,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 16:24:15,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 16:24:15,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 16:24:15,246 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 16:24:15,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:15,246 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 16:24:15,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:24:15,246 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 16:24:15,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 16:24:15,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:15,247 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:15,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:24:15,248 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:15,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:15,248 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 16:24:15,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:15,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289339564] [2020-08-18 16:24:15,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:15,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:15,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,454 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:15,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289339564] [2020-08-18 16:24:15,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:15,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:24:15,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605309883] [2020-08-18 16:24:15,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:24:15,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:15,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:24:15,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:15,456 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 16:24:15,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:15,531 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 16:24:15,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:24:15,532 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 16:24:15,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:15,532 INFO L225 Difference]: With dead ends: 25 [2020-08-18 16:24:15,533 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 16:24:15,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:24:15,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 16:24:15,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 16:24:15,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 16:24:15,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 16:24:15,540 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 16:24:15,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:15,540 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 16:24:15,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:24:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 16:24:15,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 16:24:15,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:15,541 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:15,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:24:15,542 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:15,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:15,543 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 16:24:15,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:15,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008478217] [2020-08-18 16:24:15,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:15,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:15,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:15,726 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:15,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008478217] [2020-08-18 16:24:15,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:15,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:24:15,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304162648] [2020-08-18 16:24:15,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:24:15,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:15,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:24:15,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:15,729 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 16:24:15,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:15,828 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 16:24:15,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:24:15,829 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 16:24:15,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:15,830 INFO L225 Difference]: With dead ends: 26 [2020-08-18 16:24:15,830 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 16:24:15,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:24:15,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 16:24:15,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 16:24:15,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 16:24:15,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 16:24:15,835 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 16:24:15,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:15,836 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 16:24:15,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:24:15,836 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 16:24:15,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:24:15,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:15,837 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:15,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:24:15,837 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:15,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:15,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 16:24:15,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:15,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375998088] [2020-08-18 16:24:15,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:15,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:16,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,022 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:16,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375998088] [2020-08-18 16:24:16,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:16,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:24:16,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61491716] [2020-08-18 16:24:16,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:24:16,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:16,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:24:16,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:16,025 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 16:24:16,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:16,124 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 16:24:16,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:24:16,125 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 16:24:16,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:16,126 INFO L225 Difference]: With dead ends: 27 [2020-08-18 16:24:16,126 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 16:24:16,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:24:16,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 16:24:16,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 16:24:16,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 16:24:16,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 16:24:16,132 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 16:24:16,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:16,132 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 16:24:16,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:24:16,133 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 16:24:16,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 16:24:16,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:16,134 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:16,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:24:16,134 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:16,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:16,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 16:24:16,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:16,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607709093] [2020-08-18 16:24:16,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:16,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:16,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,333 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:16,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607709093] [2020-08-18 16:24:16,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:16,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:24:16,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154949497] [2020-08-18 16:24:16,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:24:16,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:16,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:24:16,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:24:16,335 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 16:24:16,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:16,438 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 16:24:16,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:24:16,439 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 16:24:16,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:16,440 INFO L225 Difference]: With dead ends: 28 [2020-08-18 16:24:16,440 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 16:24:16,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:24:16,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 16:24:16,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 16:24:16,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 16:24:16,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 16:24:16,446 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 16:24:16,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:16,446 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 16:24:16,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:24:16,446 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 16:24:16,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 16:24:16,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:16,447 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:16,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:24:16,448 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:16,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:16,448 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 16:24:16,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:16,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364685994] [2020-08-18 16:24:16,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:16,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:16,704 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:16,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364685994] [2020-08-18 16:24:16,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:16,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:24:16,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797461160] [2020-08-18 16:24:16,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:24:16,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:16,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:24:16,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:16,707 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 16:24:16,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:16,823 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 16:24:16,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:24:16,824 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 16:24:16,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:16,825 INFO L225 Difference]: With dead ends: 29 [2020-08-18 16:24:16,825 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 16:24:16,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:24:16,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 16:24:16,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 16:24:16,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 16:24:16,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 16:24:16,830 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 16:24:16,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:16,831 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 16:24:16,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:24:16,831 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 16:24:16,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 16:24:16,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:16,832 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:16,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:24:16,832 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:16,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:16,833 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 16:24:16,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:16,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953633743] [2020-08-18 16:24:16,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:16,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:17,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,059 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:17,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953633743] [2020-08-18 16:24:17,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:17,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:24:17,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630777269] [2020-08-18 16:24:17,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:24:17,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:17,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:24:17,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:17,062 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 16:24:17,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:17,194 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 16:24:17,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:24:17,194 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 16:24:17,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:17,195 INFO L225 Difference]: With dead ends: 30 [2020-08-18 16:24:17,195 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 16:24:17,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:24:17,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 16:24:17,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 16:24:17,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 16:24:17,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 16:24:17,200 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 16:24:17,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:17,201 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 16:24:17,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:24:17,201 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 16:24:17,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 16:24:17,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:17,202 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:17,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:24:17,202 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:17,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:17,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 16:24:17,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:17,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860516428] [2020-08-18 16:24:17,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:17,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:17,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:17,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860516428] [2020-08-18 16:24:17,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:17,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:24:17,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989967556] [2020-08-18 16:24:17,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:24:17,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:17,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:24:17,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:17,456 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 16:24:17,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:17,604 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 16:24:17,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:24:17,604 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 16:24:17,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:17,605 INFO L225 Difference]: With dead ends: 31 [2020-08-18 16:24:17,605 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 16:24:17,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:24:17,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 16:24:17,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 16:24:17,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 16:24:17,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 16:24:17,611 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 16:24:17,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:17,611 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 16:24:17,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:24:17,612 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 16:24:17,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 16:24:17,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:17,613 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:17,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:24:17,613 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:17,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:17,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 16:24:17,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:17,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878186840] [2020-08-18 16:24:17,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:17,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:17,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:17,873 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:17,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878186840] [2020-08-18 16:24:17,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:17,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:24:17,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417240901] [2020-08-18 16:24:17,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:24:17,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:17,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:24:17,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:17,877 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 16:24:18,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:18,052 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 16:24:18,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:24:18,052 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 16:24:18,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:18,053 INFO L225 Difference]: With dead ends: 32 [2020-08-18 16:24:18,053 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 16:24:18,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:24:18,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 16:24:18,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 16:24:18,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 16:24:18,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 16:24:18,058 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 16:24:18,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:18,059 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 16:24:18,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:24:18,059 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 16:24:18,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 16:24:18,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:18,060 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:18,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:24:18,060 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:18,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:18,061 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 16:24:18,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:18,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869105149] [2020-08-18 16:24:18,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:18,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:18,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,371 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:18,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869105149] [2020-08-18 16:24:18,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:18,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:24:18,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413730273] [2020-08-18 16:24:18,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:24:18,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:18,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:24:18,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:18,374 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 16:24:18,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:18,584 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 16:24:18,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:24:18,585 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 16:24:18,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:18,585 INFO L225 Difference]: With dead ends: 33 [2020-08-18 16:24:18,586 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 16:24:18,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:24:18,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 16:24:18,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 16:24:18,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:24:18,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 16:24:18,591 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 16:24:18,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:18,591 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 16:24:18,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:24:18,591 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 16:24:18,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 16:24:18,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:18,592 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:18,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:24:18,593 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:18,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:18,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 16:24:18,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:18,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383120076] [2020-08-18 16:24:18,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:18,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:18,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:18,913 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:18,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383120076] [2020-08-18 16:24:18,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:18,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:24:18,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772925018] [2020-08-18 16:24:18,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:24:18,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:18,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:24:18,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:18,919 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 16:24:19,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,157 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 16:24:19,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:24:19,158 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 16:24:19,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,158 INFO L225 Difference]: With dead ends: 34 [2020-08-18 16:24:19,158 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 16:24:19,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:24:19,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 16:24:19,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 16:24:19,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 16:24:19,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 16:24:19,168 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 16:24:19,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,168 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 16:24:19,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:24:19,173 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 16:24:19,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 16:24:19,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,174 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:24:19,174 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,174 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 16:24:19,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806921940] [2020-08-18 16:24:19,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:19,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:19,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806921940] [2020-08-18 16:24:19,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:19,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:24:19,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162666555] [2020-08-18 16:24:19,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:24:19,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:19,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:24:19,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:19,548 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 16:24:19,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:19,792 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 16:24:19,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:24:19,794 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 16:24:19,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:19,795 INFO L225 Difference]: With dead ends: 35 [2020-08-18 16:24:19,795 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 16:24:19,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:24:19,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 16:24:19,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 16:24:19,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 16:24:19,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 16:24:19,800 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 16:24:19,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:19,801 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 16:24:19,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:24:19,801 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 16:24:19,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 16:24:19,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:19,802 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:19,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:24:19,802 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:19,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:19,802 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 16:24:19,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:19,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551446959] [2020-08-18 16:24:19,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:19,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,179 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551446959] [2020-08-18 16:24:20,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:24:20,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183929447] [2020-08-18 16:24:20,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:24:20,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:24:20,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:20,183 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 16:24:20,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:20,413 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 16:24:20,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:24:20,414 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 16:24:20,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:20,414 INFO L225 Difference]: With dead ends: 36 [2020-08-18 16:24:20,415 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:24:20,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:24:20,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:24:20,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 16:24:20,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 16:24:20,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 16:24:20,422 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 16:24:20,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:20,423 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 16:24:20,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:24:20,423 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 16:24:20,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 16:24:20,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:20,424 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:20,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:24:20,424 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:20,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:20,424 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 16:24:20,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:20,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248565674] [2020-08-18 16:24:20,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:20,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:20,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:20,876 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:20,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248565674] [2020-08-18 16:24:20,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:20,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:24:20,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306341555] [2020-08-18 16:24:20,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:24:20,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:20,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:24:20,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:20,880 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 16:24:21,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,177 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 16:24:21,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:24:21,178 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 16:24:21,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,179 INFO L225 Difference]: With dead ends: 37 [2020-08-18 16:24:21,179 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 16:24:21,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:24:21,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 16:24:21,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 16:24:21,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 16:24:21,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 16:24:21,185 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 16:24:21,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:21,185 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 16:24:21,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:24:21,185 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 16:24:21,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 16:24:21,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:21,186 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:21,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:24:21,187 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:21,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:21,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 16:24:21,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:21,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828470146] [2020-08-18 16:24:21,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:21,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:21,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:21,647 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:21,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828470146] [2020-08-18 16:24:21,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:21,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:24:21,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424371938] [2020-08-18 16:24:21,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:24:21,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:21,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:24:21,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:21,650 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 16:24:21,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:21,993 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 16:24:21,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:24:21,995 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 16:24:21,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:21,995 INFO L225 Difference]: With dead ends: 38 [2020-08-18 16:24:21,996 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 16:24:21,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:24:21,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 16:24:22,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 16:24:22,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 16:24:22,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 16:24:22,003 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 16:24:22,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:22,003 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 16:24:22,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:24:22,004 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 16:24:22,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 16:24:22,004 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:22,004 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:22,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:24:22,005 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:22,005 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 16:24:22,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:22,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019349985] [2020-08-18 16:24:22,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:22,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:22,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:22,490 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:22,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019349985] [2020-08-18 16:24:22,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:22,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:24:22,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345774096] [2020-08-18 16:24:22,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:24:22,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:22,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:24:22,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:22,492 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 16:24:22,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:22,828 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 16:24:22,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:24:22,831 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 16:24:22,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:22,832 INFO L225 Difference]: With dead ends: 39 [2020-08-18 16:24:22,832 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 16:24:22,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:24:22,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 16:24:22,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 16:24:22,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 16:24:22,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 16:24:22,838 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 16:24:22,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:22,839 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 16:24:22,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:24:22,839 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 16:24:22,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 16:24:22,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:22,840 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:22,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:24:22,840 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:22,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:22,841 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 16:24:22,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:22,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205344646] [2020-08-18 16:24:22,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:22,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:23,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:23,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:23,310 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:23,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205344646] [2020-08-18 16:24:23,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:23,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:24:23,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982520442] [2020-08-18 16:24:23,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:24:23,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:23,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:24:23,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:23,313 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 16:24:23,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:23,641 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 16:24:23,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:24:23,642 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 16:24:23,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:23,642 INFO L225 Difference]: With dead ends: 40 [2020-08-18 16:24:23,643 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 16:24:23,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:24:23,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 16:24:23,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 16:24:23,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 16:24:23,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 16:24:23,649 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 16:24:23,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:23,650 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 16:24:23,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:24:23,650 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 16:24:23,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 16:24:23,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:23,651 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:23,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:24:23,654 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:23,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:23,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 16:24:23,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:23,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450411092] [2020-08-18 16:24:23,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:23,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:24,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:24,251 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:24,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450411092] [2020-08-18 16:24:24,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:24,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:24:24,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63122049] [2020-08-18 16:24:24,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:24:24,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:24,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:24:24,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:24,253 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 16:24:24,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:24,583 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 16:24:24,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:24:24,583 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 16:24:24,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:24,584 INFO L225 Difference]: With dead ends: 41 [2020-08-18 16:24:24,584 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 16:24:24,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:24:24,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 16:24:24,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 16:24:24,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 16:24:24,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 16:24:24,590 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 16:24:24,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:24,590 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 16:24:24,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:24:24,591 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 16:24:24,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 16:24:24,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:24,592 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:24,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:24:24,592 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:24,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:24,593 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 16:24:24,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:24,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056626304] [2020-08-18 16:24:24,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:24,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:25,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:25,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:25,142 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:25,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056626304] [2020-08-18 16:24:25,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:25,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:24:25,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919409416] [2020-08-18 16:24:25,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:24:25,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:25,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:24:25,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:25,144 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 16:24:25,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:25,551 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 16:24:25,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:24:25,553 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 16:24:25,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:25,553 INFO L225 Difference]: With dead ends: 42 [2020-08-18 16:24:25,553 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 16:24:25,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:24:25,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 16:24:25,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 16:24:25,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 16:24:25,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 16:24:25,566 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 16:24:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:25,566 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 16:24:25,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:24:25,566 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 16:24:25,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 16:24:25,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:25,567 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:25,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:24:25,568 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:25,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:25,568 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 16:24:25,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:25,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827832850] [2020-08-18 16:24:25,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:25,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:26,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:26,193 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:26,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827832850] [2020-08-18 16:24:26,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:26,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:24:26,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482907543] [2020-08-18 16:24:26,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:24:26,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:26,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:24:26,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:26,195 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 16:24:26,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:26,664 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 16:24:26,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:24:26,665 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 16:24:26,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:26,665 INFO L225 Difference]: With dead ends: 43 [2020-08-18 16:24:26,666 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 16:24:26,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:24:26,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 16:24:26,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 16:24:26,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 16:24:26,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 16:24:26,671 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 16:24:26,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:26,671 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 16:24:26,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:24:26,672 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 16:24:26,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 16:24:26,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:26,672 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:26,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:24:26,673 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:26,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:26,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 16:24:26,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:26,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911620183] [2020-08-18 16:24:26,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:26,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:27,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:27,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911620183] [2020-08-18 16:24:27,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:27,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:24:27,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963563643] [2020-08-18 16:24:27,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:24:27,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:27,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:24:27,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:27,330 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 16:24:27,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:27,845 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 16:24:27,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:24:27,846 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 16:24:27,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:27,847 INFO L225 Difference]: With dead ends: 44 [2020-08-18 16:24:27,847 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 16:24:27,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:24:27,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 16:24:27,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 16:24:27,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 16:24:27,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 16:24:27,853 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 16:24:27,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:27,853 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 16:24:27,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:24:27,853 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 16:24:27,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 16:24:27,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:27,854 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:27,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:24:27,854 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:27,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:27,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 16:24:27,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:27,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900594226] [2020-08-18 16:24:27,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:27,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:28,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:28,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:28,579 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:28,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900594226] [2020-08-18 16:24:28,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:28,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:24:28,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727163245] [2020-08-18 16:24:28,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:24:28,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:28,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:24:28,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:28,581 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 16:24:29,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:29,118 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 16:24:29,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:24:29,118 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 16:24:29,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:29,119 INFO L225 Difference]: With dead ends: 45 [2020-08-18 16:24:29,120 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 16:24:29,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:24:29,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 16:24:29,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 16:24:29,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 16:24:29,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 16:24:29,125 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 16:24:29,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:29,126 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 16:24:29,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:24:29,126 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 16:24:29,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 16:24:29,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:29,126 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:29,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:24:29,127 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:29,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:29,127 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 16:24:29,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:29,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538726736] [2020-08-18 16:24:29,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:29,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:29,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:29,891 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:29,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538726736] [2020-08-18 16:24:29,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:29,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:24:29,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959685794] [2020-08-18 16:24:29,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:24:29,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:29,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:24:29,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:29,893 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 16:24:30,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:30,476 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 16:24:30,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:24:30,476 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 16:24:30,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:30,477 INFO L225 Difference]: With dead ends: 46 [2020-08-18 16:24:30,477 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 16:24:30,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:24:30,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 16:24:30,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 16:24:30,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 16:24:30,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 16:24:30,483 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 16:24:30,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:30,483 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 16:24:30,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:24:30,484 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 16:24:30,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 16:24:30,484 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:30,484 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:30,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:24:30,485 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:30,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:30,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 16:24:30,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:30,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688015191] [2020-08-18 16:24:30,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:30,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:31,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:31,288 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:31,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688015191] [2020-08-18 16:24:31,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:31,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:24:31,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022083726] [2020-08-18 16:24:31,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:24:31,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:31,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:24:31,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:31,290 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 16:24:31,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:31,915 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 16:24:31,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:24:31,917 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 16:24:31,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:31,918 INFO L225 Difference]: With dead ends: 47 [2020-08-18 16:24:31,918 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 16:24:31,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:24:31,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 16:24:31,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 16:24:31,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 16:24:31,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 16:24:31,923 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 16:24:31,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:31,923 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 16:24:31,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:24:31,924 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 16:24:31,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 16:24:31,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:31,924 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:31,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:24:31,925 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:31,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:31,925 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 16:24:31,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:31,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145860409] [2020-08-18 16:24:31,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:31,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:32,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:32,750 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:32,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145860409] [2020-08-18 16:24:32,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:32,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:24:32,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737997462] [2020-08-18 16:24:32,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:24:32,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:32,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:24:32,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:32,752 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 16:24:33,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:33,430 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 16:24:33,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:24:33,432 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 16:24:33,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:33,432 INFO L225 Difference]: With dead ends: 48 [2020-08-18 16:24:33,432 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 16:24:33,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:24:33,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 16:24:33,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 16:24:33,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 16:24:33,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 16:24:33,437 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 16:24:33,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:33,437 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 16:24:33,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:24:33,437 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 16:24:33,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 16:24:33,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:33,438 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:33,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:24:33,438 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:33,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:33,439 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 16:24:33,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:33,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64045657] [2020-08-18 16:24:33,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:33,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:34,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:34,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:34,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64045657] [2020-08-18 16:24:34,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:34,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:24:34,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451031363] [2020-08-18 16:24:34,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:24:34,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:34,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:24:34,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:34,307 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 16:24:35,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:35,039 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 16:24:35,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:24:35,040 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 16:24:35,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:35,041 INFO L225 Difference]: With dead ends: 49 [2020-08-18 16:24:35,041 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 16:24:35,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:24:35,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 16:24:35,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 16:24:35,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 16:24:35,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 16:24:35,046 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 16:24:35,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:35,046 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 16:24:35,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:24:35,046 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 16:24:35,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 16:24:35,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:35,047 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:35,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:24:35,047 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:35,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:35,048 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 16:24:35,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:35,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418089251] [2020-08-18 16:24:35,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:35,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:35,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:35,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:36,002 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:36,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418089251] [2020-08-18 16:24:36,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:36,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:24:36,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281083211] [2020-08-18 16:24:36,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:24:36,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:36,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:24:36,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:36,005 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 16:24:36,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:36,765 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 16:24:36,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:24:36,766 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 16:24:36,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:36,767 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:24:36,767 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 16:24:36,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:24:36,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 16:24:36,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 16:24:36,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 16:24:36,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 16:24:36,772 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 16:24:36,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:36,772 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 16:24:36,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:24:36,772 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 16:24:36,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:24:36,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:36,773 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:36,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:24:36,773 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:36,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:36,773 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 16:24:36,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:36,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382753069] [2020-08-18 16:24:36,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:36,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:37,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:37,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:37,771 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:37,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382753069] [2020-08-18 16:24:37,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:37,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:24:37,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925987717] [2020-08-18 16:24:37,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:24:37,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:37,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:24:37,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:37,773 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 16:24:38,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:38,591 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 16:24:38,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:24:38,592 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 16:24:38,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:38,593 INFO L225 Difference]: With dead ends: 51 [2020-08-18 16:24:38,593 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 16:24:38,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:24:38,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 16:24:38,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 16:24:38,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:24:38,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 16:24:38,598 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 16:24:38,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:38,598 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 16:24:38,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:24:38,599 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 16:24:38,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 16:24:38,599 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:38,599 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:38,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:24:38,600 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:38,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:38,600 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 16:24:38,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:38,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569612636] [2020-08-18 16:24:38,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:38,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:39,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:39,557 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:39,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569612636] [2020-08-18 16:24:39,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:39,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:24:39,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688104037] [2020-08-18 16:24:39,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:24:39,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:39,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:24:39,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:39,560 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 16:24:40,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:40,387 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 16:24:40,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:24:40,388 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 16:24:40,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:40,389 INFO L225 Difference]: With dead ends: 52 [2020-08-18 16:24:40,389 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 16:24:40,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:24:40,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 16:24:40,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 16:24:40,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 16:24:40,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 16:24:40,393 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 16:24:40,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:40,394 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 16:24:40,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:24:40,394 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 16:24:40,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 16:24:40,394 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:40,394 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:40,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:24:40,395 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:40,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:40,395 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 16:24:40,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:40,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794461118] [2020-08-18 16:24:40,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:40,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:41,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:41,464 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:41,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794461118] [2020-08-18 16:24:41,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:41,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:24:41,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597232351] [2020-08-18 16:24:41,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:24:41,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:41,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:24:41,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:41,466 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 16:24:42,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:42,368 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 16:24:42,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:24:42,369 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 16:24:42,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:42,370 INFO L225 Difference]: With dead ends: 53 [2020-08-18 16:24:42,370 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 16:24:42,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:42,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 16:24:42,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 16:24:42,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 16:24:42,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 16:24:42,375 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 16:24:42,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:42,376 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 16:24:42,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:24:42,376 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 16:24:42,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 16:24:42,377 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:42,377 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:42,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:24:42,377 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:42,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:42,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 16:24:42,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:42,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933843417] [2020-08-18 16:24:42,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:42,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:43,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:43,546 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:43,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933843417] [2020-08-18 16:24:43,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:43,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:24:43,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263468620] [2020-08-18 16:24:43,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:24:43,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:43,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:24:43,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:43,548 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 16:24:44,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:44,466 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 16:24:44,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:24:44,466 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 16:24:44,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:44,467 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:24:44,467 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:24:44,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:44,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:24:44,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 16:24:44,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:24:44,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 16:24:44,472 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 16:24:44,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:44,472 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 16:24:44,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:24:44,472 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 16:24:44,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 16:24:44,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:44,473 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:44,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:24:44,473 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:44,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:44,474 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 16:24:44,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:44,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956375603] [2020-08-18 16:24:44,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:44,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:45,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:45,666 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:45,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956375603] [2020-08-18 16:24:45,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:45,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:24:45,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828083762] [2020-08-18 16:24:45,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:24:45,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:45,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:24:45,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:45,668 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 16:24:46,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:46,691 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 16:24:46,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:24:46,692 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 16:24:46,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:46,693 INFO L225 Difference]: With dead ends: 55 [2020-08-18 16:24:46,693 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 16:24:46,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:46,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 16:24:46,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 16:24:46,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 16:24:46,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 16:24:46,698 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 16:24:46,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:46,698 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 16:24:46,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 16:24:46,699 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 16:24:46,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 16:24:46,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:46,699 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:46,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:24:46,700 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:46,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:46,700 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 16:24:46,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:46,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002481709] [2020-08-18 16:24:46,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:46,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:47,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:47,936 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:47,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002481709] [2020-08-18 16:24:47,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:47,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 16:24:47,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852857511] [2020-08-18 16:24:47,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 16:24:47,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:47,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 16:24:47,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:47,939 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 16:24:49,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:49,016 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 16:24:49,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 16:24:49,016 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 16:24:49,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:49,017 INFO L225 Difference]: With dead ends: 56 [2020-08-18 16:24:49,017 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 16:24:49,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:49,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 16:24:49,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 16:24:49,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 16:24:49,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 16:24:49,022 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 16:24:49,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:49,023 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 16:24:49,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 16:24:49,023 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 16:24:49,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 16:24:49,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:49,024 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:49,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:24:49,024 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:49,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:49,024 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 16:24:49,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:49,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443672916] [2020-08-18 16:24:49,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:49,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:50,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:50,330 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:50,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443672916] [2020-08-18 16:24:50,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:50,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 16:24:50,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853702117] [2020-08-18 16:24:50,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 16:24:50,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:50,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 16:24:50,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:50,332 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 16:24:51,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:51,480 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 16:24:51,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 16:24:51,481 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 16:24:51,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:51,482 INFO L225 Difference]: With dead ends: 57 [2020-08-18 16:24:51,482 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 16:24:51,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:51,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 16:24:51,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 16:24:51,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 16:24:51,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 16:24:51,487 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 16:24:51,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:51,488 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 16:24:51,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 16:24:51,488 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 16:24:51,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 16:24:51,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:51,488 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:51,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 16:24:51,488 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:51,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:51,489 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 16:24:51,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:51,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041295833] [2020-08-18 16:24:51,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:51,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:52,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:52,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:52,829 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:52,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041295833] [2020-08-18 16:24:52,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:52,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 16:24:52,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009011798] [2020-08-18 16:24:52,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 16:24:52,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:52,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 16:24:52,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:52,831 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 16:24:53,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:53,994 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 16:24:53,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 16:24:53,995 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 16:24:53,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:53,996 INFO L225 Difference]: With dead ends: 58 [2020-08-18 16:24:53,996 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 16:24:53,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:53,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 16:24:54,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 16:24:54,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 16:24:54,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 16:24:54,001 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 16:24:54,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:54,001 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 16:24:54,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 16:24:54,001 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 16:24:54,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 16:24:54,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:54,002 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:54,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 16:24:54,002 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:54,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:54,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 16:24:54,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:54,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771201565] [2020-08-18 16:24:54,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:55,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:55,409 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:55,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771201565] [2020-08-18 16:24:55,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:55,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 16:24:55,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691547403] [2020-08-18 16:24:55,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 16:24:55,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:55,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 16:24:55,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:24:55,412 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 16:24:56,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:56,650 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 16:24:56,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 16:24:56,652 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 16:24:56,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:56,653 INFO L225 Difference]: With dead ends: 59 [2020-08-18 16:24:56,653 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 16:24:56,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:24:56,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 16:24:56,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 16:24:56,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 16:24:56,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 16:24:56,658 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 16:24:56,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:56,659 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 16:24:56,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 16:24:56,659 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 16:24:56,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 16:24:56,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:56,660 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:56,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 16:24:56,660 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:56,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:56,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 16:24:56,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:56,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696110629] [2020-08-18 16:24:56,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:56,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:58,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:58,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:58,219 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:24:58,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696110629] [2020-08-18 16:24:58,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:58,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 16:24:58,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078415642] [2020-08-18 16:24:58,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 16:24:58,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:58,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 16:24:58,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:24:58,222 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 16:24:59,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:59,537 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 16:24:59,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 16:24:59,537 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 16:24:59,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:59,538 INFO L225 Difference]: With dead ends: 60 [2020-08-18 16:24:59,538 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 16:24:59,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:24:59,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 16:24:59,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 16:24:59,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 16:24:59,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 16:24:59,542 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 16:24:59,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:59,543 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 16:24:59,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 16:24:59,543 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 16:24:59,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 16:24:59,543 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:59,543 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:59,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 16:24:59,543 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:59,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:59,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 16:24:59,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:59,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691622671] [2020-08-18 16:24:59,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:59,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:01,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:01,169 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:01,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691622671] [2020-08-18 16:25:01,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:01,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 16:25:01,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900437876] [2020-08-18 16:25:01,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 16:25:01,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:01,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 16:25:01,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 16:25:01,170 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 16:25:02,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:02,543 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 16:25:02,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 16:25:02,544 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 16:25:02,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:02,545 INFO L225 Difference]: With dead ends: 61 [2020-08-18 16:25:02,545 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 16:25:02,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 16:25:02,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 16:25:02,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 16:25:02,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 16:25:02,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 16:25:02,550 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 16:25:02,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:02,550 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 16:25:02,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 16:25:02,551 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 16:25:02,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 16:25:02,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:02,551 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:02,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 16:25:02,552 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:02,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:02,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 16:25:02,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:02,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468232147] [2020-08-18 16:25:02,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:02,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:04,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:04,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:04,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:04,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468232147] [2020-08-18 16:25:04,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:04,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 16:25:04,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674232126] [2020-08-18 16:25:04,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 16:25:04,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:04,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 16:25:04,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 16:25:04,324 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 16:25:05,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:05,725 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 16:25:05,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 16:25:05,726 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 16:25:05,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:05,727 INFO L225 Difference]: With dead ends: 62 [2020-08-18 16:25:05,727 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 16:25:05,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 16:25:05,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 16:25:05,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 16:25:05,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 16:25:05,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 16:25:05,731 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 16:25:05,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:05,731 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 16:25:05,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 16:25:05,731 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 16:25:05,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 16:25:05,732 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:05,732 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:05,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 16:25:05,732 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:05,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:05,733 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 16:25:05,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:05,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094417278] [2020-08-18 16:25:05,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:07,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:07,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:07,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:07,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094417278] [2020-08-18 16:25:07,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:07,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 16:25:07,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67460441] [2020-08-18 16:25:07,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 16:25:07,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:07,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 16:25:07,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 16:25:07,381 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 16:25:08,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:25:08,818 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 16:25:08,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 16:25:08,820 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 16:25:08,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:25:08,821 INFO L225 Difference]: With dead ends: 63 [2020-08-18 16:25:08,821 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 16:25:08,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 16:25:08,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 16:25:08,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 16:25:08,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 16:25:08,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 16:25:08,826 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 16:25:08,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:25:08,826 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 16:25:08,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 16:25:08,826 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 16:25:08,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 16:25:08,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:25:08,827 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:25:08,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 16:25:08,827 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:25:08,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:25:08,827 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 16:25:08,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:25:08,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1591382493] [2020-08-18 16:25:08,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:25:08,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:10,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:25:10,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:25:10,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:25:10,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1591382493] [2020-08-18 16:25:10,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:25:10,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 16:25:10,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886420340] [2020-08-18 16:25:10,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 16:25:10,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:25:10,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 16:25:10,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 16:25:10,524 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.