/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options log-additional-information=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 0.1.25-177f698 [2020-08-21 14:14:46,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:14:46,364 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:14:46,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:14:46,389 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:14:46,393 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:14:46,394 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:14:46,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:14:46,402 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:14:46,403 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:14:46,404 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:14:46,405 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:14:46,405 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:14:46,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:14:46,408 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:14:46,410 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:14:46,411 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:14:46,412 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:14:46,415 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:14:46,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:14:46,419 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:14:46,420 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:14:46,422 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:14:46,423 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:14:46,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:14:46,439 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:14:46,440 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:14:46,450 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:14:46,450 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 [2020-08-21 14:14:46,488 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:14:46,488 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:14:46,490 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:14:46,490 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:14:46,490 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:14:46,490 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:14:46,491 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:14:46,491 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:14:46,491 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:14:46,491 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:14:46,492 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:14:46,492 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:14:46,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:14:46,493 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:14:46,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:14:46,493 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:14:46,493 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:14:46,494 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:14:46,494 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:14:46,494 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:14:46,494 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:14:46,494 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:14:46,495 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:14:46,495 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:14:46,495 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:14:46,495 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:14:46,495 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:14:46,495 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:14:46,496 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:14:46,496 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> log-additional-information=true; [2020-08-21 14:14:46,801 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:14:46,816 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:14:46,822 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:14:46,825 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:14:46,826 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:14:46,826 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 14:14:46,896 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9a77e4314/bb68a8ddcf84418485adf1470b7988b9/FLAG816704f04 [2020-08-21 14:14:47,323 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:14:47,324 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 14:14:47,329 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9a77e4314/bb68a8ddcf84418485adf1470b7988b9/FLAG816704f04 [2020-08-21 14:14:47,705 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9a77e4314/bb68a8ddcf84418485adf1470b7988b9 [2020-08-21 14:14:47,713 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:14:47,715 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:14:47,716 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:47,716 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:14:47,719 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:14:47,720 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,723 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ba61646 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47, skipping insertion in model container [2020-08-21 14:14:47,723 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,731 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:14:47,749 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:14:47,937 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:47,941 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:14:47,956 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:47,970 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:14:47,971 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47 WrapperNode [2020-08-21 14:14:47,971 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:47,972 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:14:47,972 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:14:47,972 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:14:47,985 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,985 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,990 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,998 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:47,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (1/1) ... [2020-08-21 14:14:48,071 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:14:48,071 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:14:48,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:14:48,072 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:14:48,073 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (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 [2020-08-21 14:14:48,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:14:48,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:14:48,133 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:14:48,133 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:14:48,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:14:48,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:14:48,134 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:14:48,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:14:48,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:14:48,291 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:14:48,292 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 14:14:48,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:48 BoogieIcfgContainer [2020-08-21 14:14:48,295 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:14:48,296 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:14:48,296 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:14:48,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:14:48,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:14:47" (1/3) ... [2020-08-21 14:14:48,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@206b7d71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:48, skipping insertion in model container [2020-08-21 14:14:48,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:47" (2/3) ... [2020-08-21 14:14:48,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@206b7d71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:48, skipping insertion in model container [2020-08-21 14:14:48,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:48" (3/3) ... [2020-08-21 14:14:48,302 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 14:14:48,312 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:14:48,319 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:14:48,332 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:14:48,354 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:14:48,354 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:14:48,354 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:14:48,354 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:14:48,354 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:14:48,355 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:14:48,355 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:14:48,355 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:14:48,371 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 14:14:48,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 14:14:48,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:48,377 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:48,377 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:48,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:48,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 14:14:48,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:48,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250425279] [2020-08-21 14:14:48,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:48,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:48,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:48,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250425279] [2020-08-21 14:14:48,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:48,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:14:48,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109765992] [2020-08-21 14:14:48,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:14:48,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:48,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:14:48,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:14:48,605 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 14:14:48,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:48,654 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 14:14:48,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:14:48,657 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 14:14:48,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:48,666 INFO L225 Difference]: With dead ends: 29 [2020-08-21 14:14:48,667 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 14:14:48,680 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 [2020-08-21 14:14:48,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 14:14:48,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 14:14:48,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 14:14:48,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 14:14:48,712 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 14:14:48,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:48,713 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 14:14:48,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:14:48,713 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 14:14:48,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 14:14:48,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:48,714 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:48,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:14:48,715 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:48,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:48,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 14:14:48,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:48,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981872801] [2020-08-21 14:14:48,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:48,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:48,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:48,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981872801] [2020-08-21 14:14:48,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:48,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 14:14:48,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428707602] [2020-08-21 14:14:48,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:14:48,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:48,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:14:48,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:14:48,806 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 14:14:48,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:48,825 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 14:14:48,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:14:48,826 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 14:14:48,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:48,827 INFO L225 Difference]: With dead ends: 18 [2020-08-21 14:14:48,827 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 14:14:48,828 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 [2020-08-21 14:14:48,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 14:14:48,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 14:14:48,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 14:14:48,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 14:14:48,833 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 14:14:48,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:48,834 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 14:14:48,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:14:48,834 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 14:14:48,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 14:14:48,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:48,835 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:48,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:14:48,836 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:48,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:48,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 14:14:48,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:48,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [759436948] [2020-08-21 14:14:48,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:48,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:48,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:48,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [759436948] [2020-08-21 14:14:48,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:48,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 14:14:48,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589869650] [2020-08-21 14:14:48,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:14:48,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:48,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:14:48,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:48,963 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 14:14:48,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:48,987 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 14:14:48,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:14:48,988 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 14:14:48,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:48,989 INFO L225 Difference]: With dead ends: 19 [2020-08-21 14:14:48,989 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 14:14:48,990 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 [2020-08-21 14:14:48,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 14:14:48,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 14:14:48,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 14:14:48,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 14:14:48,995 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 14:14:48,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:48,995 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 14:14:48,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:14:48,996 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 14:14:48,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 14:14:48,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:48,997 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:48,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:14:48,997 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:48,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:48,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 14:14:48,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:48,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814111112] [2020-08-21 14:14:48,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814111112] [2020-08-21 14:14:49,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:14:49,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822779437] [2020-08-21 14:14:49,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:14:49,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:14:49,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:14:49,106 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 14:14:49,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,130 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 14:14:49,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:14:49,131 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 14:14:49,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,132 INFO L225 Difference]: With dead ends: 20 [2020-08-21 14:14:49,132 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 14:14:49,133 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 [2020-08-21 14:14:49,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 14:14:49,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 14:14:49,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 14:14:49,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 14:14:49,138 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 14:14:49,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,138 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 14:14:49,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:14:49,139 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 14:14:49,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 14:14:49,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,140 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:14:49,140 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 14:14:49,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000483824] [2020-08-21 14:14:49,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,247 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000483824] [2020-08-21 14:14:49,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:14:49,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963771613] [2020-08-21 14:14:49,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:14:49,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:14:49,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:14:49,250 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 14:14:49,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,285 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 14:14:49,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:14:49,285 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 14:14:49,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,286 INFO L225 Difference]: With dead ends: 21 [2020-08-21 14:14:49,286 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 14:14:49,287 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 [2020-08-21 14:14:49,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 14:14:49,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 14:14:49,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 14:14:49,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 14:14:49,293 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 14:14:49,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,293 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 14:14:49,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:14:49,293 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 14:14:49,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 14:14:49,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,294 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:14:49,295 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 14:14:49,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707080397] [2020-08-21 14:14:49,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,472 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707080397] [2020-08-21 14:14:49,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:14:49,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802276288] [2020-08-21 14:14:49,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:14:49,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:14:49,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:49,477 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 14:14:49,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,537 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 14:14:49,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:14:49,539 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 14:14:49,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,539 INFO L225 Difference]: With dead ends: 22 [2020-08-21 14:14:49,541 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 14:14:49,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:49,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 14:14:49,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 14:14:49,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 14:14:49,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 14:14:49,552 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 14:14:49,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,553 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 14:14:49,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:14:49,553 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 14:14:49,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 14:14:49,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,554 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:14:49,554 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 14:14:49,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914009436] [2020-08-21 14:14:49,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,710 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914009436] [2020-08-21 14:14:49,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:14:49,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399967637] [2020-08-21 14:14:49,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:14:49,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:14:49,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:14:49,712 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 14:14:49,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,758 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 14:14:49,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:14:49,758 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 14:14:49,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,759 INFO L225 Difference]: With dead ends: 23 [2020-08-21 14:14:49,759 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 14:14:49,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:14:49,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 14:14:49,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 14:14:49,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 14:14:49,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 14:14:49,765 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 14:14:49,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,766 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 14:14:49,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:14:49,766 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 14:14:49,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 14:14:49,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,767 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:14:49,767 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,768 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 14:14:49,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058822849] [2020-08-21 14:14:49,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058822849] [2020-08-21 14:14:49,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:14:49,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94991006] [2020-08-21 14:14:49,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:14:49,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:14:49,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:14:49,906 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 14:14:49,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,954 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 14:14:49,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:14:49,955 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 14:14:49,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,955 INFO L225 Difference]: With dead ends: 24 [2020-08-21 14:14:49,955 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 14:14:49,956 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 [2020-08-21 14:14:49,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 14:14:49,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 14:14:49,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 14:14:49,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 14:14:49,961 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 14:14:49,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,961 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 14:14:49,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:14:49,962 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 14:14:49,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 14:14:49,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,962 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:14:49,963 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,963 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 14:14:49,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436692444] [2020-08-21 14:14:49,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:50,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,113 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:50,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436692444] [2020-08-21 14:14:50,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:50,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 14:14:50,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110629438] [2020-08-21 14:14:50,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:14:50,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:50,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:14:50,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:14:50,116 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 14:14:50,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:50,193 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 14:14:50,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:14:50,195 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 14:14:50,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:50,195 INFO L225 Difference]: With dead ends: 25 [2020-08-21 14:14:50,195 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 14:14:50,197 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 [2020-08-21 14:14:50,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 14:14:50,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 14:14:50,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 14:14:50,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 14:14:50,202 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 14:14:50,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:50,202 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 14:14:50,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:14:50,202 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 14:14:50,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 14:14:50,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:50,203 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:50,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:14:50,204 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:50,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:50,204 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 14:14:50,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:50,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389726720] [2020-08-21 14:14:50,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:50,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:50,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,358 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:50,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389726720] [2020-08-21 14:14:50,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:50,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:14:50,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870789595] [2020-08-21 14:14:50,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:14:50,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:50,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:14:50,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:14:50,361 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 14:14:50,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:50,440 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 14:14:50,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:14:50,441 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 14:14:50,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:50,441 INFO L225 Difference]: With dead ends: 26 [2020-08-21 14:14:50,441 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 14:14:50,442 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 [2020-08-21 14:14:50,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 14:14:50,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 14:14:50,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 14:14:50,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 14:14:50,455 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 14:14:50,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:50,455 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 14:14:50,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:14:50,456 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 14:14:50,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 14:14:50,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:50,457 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:50,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:14:50,458 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:50,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:50,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 14:14:50,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:50,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278879554] [2020-08-21 14:14:50,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:50,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:50,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:50,702 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:50,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278879554] [2020-08-21 14:14:50,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:50,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:14:50,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095928956] [2020-08-21 14:14:50,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:14:50,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:50,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:14:50,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:14:50,706 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 14:14:50,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:50,803 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 14:14:50,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 14:14:50,805 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 14:14:50,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:50,806 INFO L225 Difference]: With dead ends: 27 [2020-08-21 14:14:50,806 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 14:14:50,809 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 [2020-08-21 14:14:50,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 14:14:50,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 14:14:50,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 14:14:50,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 14:14:50,815 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 14:14:50,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:50,817 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 14:14:50,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:14:50,818 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 14:14:50,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 14:14:50,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:50,819 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:50,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:14:50,819 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:50,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:50,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 14:14:50,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:50,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085316037] [2020-08-21 14:14:50,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:50,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:51,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,041 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:51,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085316037] [2020-08-21 14:14:51,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:51,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 14:14:51,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347901958] [2020-08-21 14:14:51,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 14:14:51,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:51,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 14:14:51,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:14:51,043 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 14:14:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:51,144 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 14:14:51,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:14:51,145 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 14:14:51,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:51,146 INFO L225 Difference]: With dead ends: 28 [2020-08-21 14:14:51,146 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 14:14:51,146 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 [2020-08-21 14:14:51,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 14:14:51,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 14:14:51,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 14:14:51,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 14:14:51,153 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 14:14:51,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:51,155 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 14:14:51,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 14:14:51,155 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 14:14:51,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 14:14:51,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:51,157 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:51,157 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:14:51,158 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:51,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:51,158 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 14:14:51,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:51,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591599387] [2020-08-21 14:14:51,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:51,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:51,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:51,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591599387] [2020-08-21 14:14:51,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:51,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 14:14:51,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400292672] [2020-08-21 14:14:51,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 14:14:51,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:51,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 14:14:51,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:14:51,385 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 14:14:51,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:51,509 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 14:14:51,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:14:51,510 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 14:14:51,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:51,511 INFO L225 Difference]: With dead ends: 29 [2020-08-21 14:14:51,511 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 14:14:51,511 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 [2020-08-21 14:14:51,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 14:14:51,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 14:14:51,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 14:14:51,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 14:14:51,516 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 14:14:51,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:51,516 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 14:14:51,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 14:14:51,517 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 14:14:51,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 14:14:51,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:51,517 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:51,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:14:51,518 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:51,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:51,518 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 14:14:51,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:51,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958129067] [2020-08-21 14:14:51,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:51,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:51,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:51,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958129067] [2020-08-21 14:14:51,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:51,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 14:14:51,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082653738] [2020-08-21 14:14:51,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 14:14:51,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:51,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 14:14:51,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:14:51,753 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 14:14:51,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:51,902 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 14:14:51,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:14:51,906 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 14:14:51,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:51,907 INFO L225 Difference]: With dead ends: 30 [2020-08-21 14:14:51,907 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 14:14:51,907 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 [2020-08-21 14:14:51,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 14:14:51,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 14:14:51,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 14:14:51,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 14:14:51,918 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 14:14:51,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:51,918 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 14:14:51,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 14:14:51,918 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 14:14:51,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 14:14:51,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:51,919 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:51,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 14:14:51,919 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:51,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:51,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 14:14:51,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:51,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788919881] [2020-08-21 14:14:51,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:51,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:52,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:52,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:52,154 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:52,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788919881] [2020-08-21 14:14:52,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:52,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 14:14:52,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031786397] [2020-08-21 14:14:52,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 14:14:52,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:52,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 14:14:52,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:52,157 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 14:14:52,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:52,324 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 14:14:52,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 14:14:52,324 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 14:14:52,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:52,325 INFO L225 Difference]: With dead ends: 31 [2020-08-21 14:14:52,325 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 14:14:52,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:52,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 14:14:52,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 14:14:52,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 14:14:52,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 14:14:52,330 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 14:14:52,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:52,331 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 14:14:52,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 14:14:52,331 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 14:14:52,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 14:14:52,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:52,332 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:52,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 14:14:52,332 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:52,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:52,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 14:14:52,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:52,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300865108] [2020-08-21 14:14:52,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:52,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:52,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:52,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:52,616 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:52,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300865108] [2020-08-21 14:14:52,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:52,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 14:14:52,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760855429] [2020-08-21 14:14:52,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 14:14:52,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:52,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 14:14:52,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:14:52,618 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 14:14:52,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:52,785 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 14:14:52,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 14:14:52,786 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 14:14:52,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:52,787 INFO L225 Difference]: With dead ends: 32 [2020-08-21 14:14:52,787 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 14:14:52,788 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 [2020-08-21 14:14:52,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 14:14:52,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 14:14:52,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 14:14:52,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 14:14:52,792 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 14:14:52,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:52,792 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 14:14:52,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 14:14:52,793 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 14:14:52,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 14:14:52,793 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:52,793 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:52,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 14:14:52,794 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:52,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:52,794 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 14:14:52,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:52,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024790259] [2020-08-21 14:14:52,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:52,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:53,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,076 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:53,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024790259] [2020-08-21 14:14:53,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:53,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 14:14:53,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78538166] [2020-08-21 14:14:53,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 14:14:53,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:53,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 14:14:53,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:14:53,078 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 14:14:53,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:53,262 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 14:14:53,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 14:14:53,263 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 14:14:53,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:53,263 INFO L225 Difference]: With dead ends: 33 [2020-08-21 14:14:53,264 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 14:14:53,265 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 [2020-08-21 14:14:53,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 14:14:53,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 14:14:53,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 14:14:53,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 14:14:53,274 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 14:14:53,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:53,274 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 14:14:53,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 14:14:53,275 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 14:14:53,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 14:14:53,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:53,278 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:53,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 14:14:53,278 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:53,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:53,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 14:14:53,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:53,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414117903] [2020-08-21 14:14:53,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:53,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:53,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:53,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414117903] [2020-08-21 14:14:53,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:53,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 14:14:53,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325390948] [2020-08-21 14:14:53,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 14:14:53,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:53,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 14:14:53,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:14:53,606 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 14:14:53,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:53,817 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 14:14:53,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 14:14:53,818 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 14:14:53,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:53,819 INFO L225 Difference]: With dead ends: 34 [2020-08-21 14:14:53,819 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 14:14:53,820 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 [2020-08-21 14:14:53,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 14:14:53,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 14:14:53,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 14:14:53,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 14:14:53,826 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 14:14:53,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:53,826 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 14:14:53,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 14:14:53,826 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 14:14:53,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 14:14:53,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:53,827 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:53,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 14:14:53,828 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:53,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:53,828 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 14:14:53,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:53,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829779078] [2020-08-21 14:14:53,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:53,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:54,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:54,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:54,155 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:54,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [829779078] [2020-08-21 14:14:54,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:54,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 14:14:54,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189285708] [2020-08-21 14:14:54,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 14:14:54,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:54,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 14:14:54,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:54,159 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 14:14:54,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:54,363 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 14:14:54,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 14:14:54,363 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 14:14:54,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:54,364 INFO L225 Difference]: With dead ends: 35 [2020-08-21 14:14:54,364 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 14:14:54,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:54,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 14:14:54,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 14:14:54,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 14:14:54,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 14:14:54,369 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 14:14:54,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:54,370 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 14:14:54,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 14:14:54,370 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 14:14:54,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 14:14:54,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:54,371 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:54,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 14:14:54,371 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:54,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:54,371 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 14:14:54,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:54,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982288165] [2020-08-21 14:14:54,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:54,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:54,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:54,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:54,728 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:54,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982288165] [2020-08-21 14:14:54,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:54,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 14:14:54,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782412385] [2020-08-21 14:14:54,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 14:14:54,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:54,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 14:14:54,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:14:54,731 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 14:14:54,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:54,988 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 14:14:54,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 14:14:54,989 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 14:14:54,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:54,990 INFO L225 Difference]: With dead ends: 36 [2020-08-21 14:14:54,990 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 14:14:54,991 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 [2020-08-21 14:14:54,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 14:14:54,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 14:14:54,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 14:14:54,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 14:14:54,997 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 14:14:54,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:54,997 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 14:14:54,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 14:14:54,997 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 14:14:54,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 14:14:54,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:54,998 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:54,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 14:14:54,999 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:54,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:54,999 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 14:14:54,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:54,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498272199] [2020-08-21 14:14:54,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:55,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:55,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:55,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498272199] [2020-08-21 14:14:55,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:55,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 14:14:55,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778046772] [2020-08-21 14:14:55,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 14:14:55,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:55,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 14:14:55,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:14:55,403 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 14:14:55,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:55,702 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 14:14:55,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 14:14:55,702 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 14:14:55,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:55,703 INFO L225 Difference]: With dead ends: 37 [2020-08-21 14:14:55,703 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 14:14:55,704 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 [2020-08-21 14:14:55,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 14:14:55,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 14:14:55,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 14:14:55,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 14:14:55,708 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 14:14:55,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:55,708 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 14:14:55,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 14:14:55,709 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 14:14:55,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:14:55,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:55,709 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:55,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 14:14:55,710 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:55,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:55,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 14:14:55,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:55,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090520593] [2020-08-21 14:14:55,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:55,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,135 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090520593] [2020-08-21 14:14:56,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 14:14:56,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45231946] [2020-08-21 14:14:56,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 14:14:56,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 14:14:56,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:56,138 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 14:14:56,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:56,435 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 14:14:56,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 14:14:56,437 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 14:14:56,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:56,438 INFO L225 Difference]: With dead ends: 38 [2020-08-21 14:14:56,438 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 14:14:56,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:56,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 14:14:56,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 14:14:56,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 14:14:56,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 14:14:56,443 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 14:14:56,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:56,444 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 14:14:56,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 14:14:56,444 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 14:14:56,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 14:14:56,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:56,445 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:56,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 14:14:56,445 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:56,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:56,445 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 14:14:56,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:56,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842241568] [2020-08-21 14:14:56,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,912 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842241568] [2020-08-21 14:14:56,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 14:14:56,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752889560] [2020-08-21 14:14:56,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 14:14:56,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 14:14:56,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:14:56,915 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 14:14:57,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:57,281 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 14:14:57,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 14:14:57,282 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 14:14:57,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:57,283 INFO L225 Difference]: With dead ends: 39 [2020-08-21 14:14:57,283 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 14:14:57,284 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 [2020-08-21 14:14:57,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 14:14:57,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 14:14:57,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 14:14:57,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 14:14:57,289 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 14:14:57,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:57,289 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 14:14:57,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 14:14:57,290 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 14:14:57,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:14:57,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:57,290 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:57,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 14:14:57,291 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:57,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:57,291 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 14:14:57,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:57,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169445488] [2020-08-21 14:14:57,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:57,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:57,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:57,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:57,735 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:57,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169445488] [2020-08-21 14:14:57,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:57,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 14:14:57,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023831000] [2020-08-21 14:14:57,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 14:14:57,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:57,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 14:14:57,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:14:57,738 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 14:14:58,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:58,109 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 14:14:58,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 14:14:58,110 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 14:14:58,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:58,110 INFO L225 Difference]: With dead ends: 40 [2020-08-21 14:14:58,110 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 14:14:58,111 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 [2020-08-21 14:14:58,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 14:14:58,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 14:14:58,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 14:14:58,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 14:14:58,116 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 14:14:58,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:58,116 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 14:14:58,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 14:14:58,117 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 14:14:58,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 14:14:58,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:58,117 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:58,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 14:14:58,120 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:58,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:58,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 14:14:58,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:58,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049618683] [2020-08-21 14:14:58,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:58,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:58,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:58,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:58,620 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:58,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049618683] [2020-08-21 14:14:58,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:58,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 14:14:58,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605608462] [2020-08-21 14:14:58,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 14:14:58,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:58,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 14:14:58,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:58,622 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 14:14:58,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:58,995 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 14:14:58,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 14:14:58,996 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 14:14:58,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:58,996 INFO L225 Difference]: With dead ends: 41 [2020-08-21 14:14:58,996 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 14:14:58,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:58,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 14:14:59,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 14:14:59,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 14:14:59,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 14:14:59,007 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 14:14:59,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:59,007 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 14:14:59,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 14:14:59,011 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 14:14:59,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 14:14:59,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:59,012 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:59,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 14:14:59,012 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:59,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:59,012 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 14:14:59,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:59,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843371027] [2020-08-21 14:14:59,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:59,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:59,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:59,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:59,551 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:59,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843371027] [2020-08-21 14:14:59,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:59,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 14:14:59,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646703090] [2020-08-21 14:14:59,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 14:14:59,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:59,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 14:14:59,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:14:59,555 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 14:15:00,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:00,018 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 14:15:00,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 14:15:00,020 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 14:15:00,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:00,020 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:15:00,021 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 14:15:00,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:15:00,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 14:15:00,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 14:15:00,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 14:15:00,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 14:15:00,032 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 14:15:00,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:00,032 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 14:15:00,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 14:15:00,033 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 14:15:00,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 14:15:00,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:00,035 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:00,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 14:15:00,036 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:00,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:00,036 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 14:15:00,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:00,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438190343] [2020-08-21 14:15:00,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:00,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:00,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:00,612 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:00,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438190343] [2020-08-21 14:15:00,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:00,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 14:15:00,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184371058] [2020-08-21 14:15:00,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 14:15:00,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:00,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 14:15:00,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:15:00,614 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 14:15:01,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:01,046 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 14:15:01,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 14:15:01,046 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 14:15:01,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:01,047 INFO L225 Difference]: With dead ends: 43 [2020-08-21 14:15:01,047 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 14:15:01,048 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 [2020-08-21 14:15:01,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 14:15:01,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 14:15:01,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 14:15:01,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 14:15:01,053 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 14:15:01,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:01,054 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 14:15:01,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 14:15:01,054 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 14:15:01,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 14:15:01,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:01,055 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:01,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 14:15:01,055 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:01,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:01,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 14:15:01,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:01,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950022568] [2020-08-21 14:15:01,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:01,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:01,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:01,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:01,703 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:01,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950022568] [2020-08-21 14:15:01,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:01,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 14:15:01,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127489043] [2020-08-21 14:15:01,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 14:15:01,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:01,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 14:15:01,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:15:01,704 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 14:15:02,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:02,227 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 14:15:02,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 14:15:02,227 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 14:15:02,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:02,228 INFO L225 Difference]: With dead ends: 44 [2020-08-21 14:15:02,228 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 14:15:02,228 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 [2020-08-21 14:15:02,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 14:15:02,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 14:15:02,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 14:15:02,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 14:15:02,233 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 14:15:02,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:02,233 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 14:15:02,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 14:15:02,234 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 14:15:02,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 14:15:02,234 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:02,234 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:02,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 14:15:02,235 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:02,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:02,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 14:15:02,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:02,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232259467] [2020-08-21 14:15:02,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:02,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:02,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:02,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:02,995 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:02,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232259467] [2020-08-21 14:15:02,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:02,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 14:15:02,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524320449] [2020-08-21 14:15:02,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 14:15:02,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:02,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 14:15:02,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:15:02,997 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 14:15:03,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:03,556 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 14:15:03,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 14:15:03,557 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 14:15:03,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:03,557 INFO L225 Difference]: With dead ends: 45 [2020-08-21 14:15:03,557 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 14:15:03,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:15:03,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 14:15:03,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 14:15:03,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 14:15:03,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 14:15:03,564 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 14:15:03,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:03,564 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 14:15:03,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 14:15:03,565 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 14:15:03,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:15:03,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:03,565 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:03,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 14:15:03,566 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:03,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:03,566 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 14:15:03,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:03,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993588974] [2020-08-21 14:15:03,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:03,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:04,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:04,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:04,287 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:04,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993588974] [2020-08-21 14:15:04,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:04,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 14:15:04,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619044375] [2020-08-21 14:15:04,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 14:15:04,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:04,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 14:15:04,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:15:04,289 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 14:15:04,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:04,835 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 14:15:04,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 14:15:04,836 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 14:15:04,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:04,837 INFO L225 Difference]: With dead ends: 46 [2020-08-21 14:15:04,837 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 14:15:04,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:15:04,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 14:15:04,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 14:15:04,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 14:15:04,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 14:15:04,843 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 14:15:04,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:04,843 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 14:15:04,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 14:15:04,843 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 14:15:04,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 14:15:04,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:04,844 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:04,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 14:15:04,844 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:04,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:04,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 14:15:04,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:04,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145760736] [2020-08-21 14:15:04,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:04,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:05,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:05,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:05,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145760736] [2020-08-21 14:15:05,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:05,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 14:15:05,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643028284] [2020-08-21 14:15:05,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 14:15:05,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:05,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 14:15:05,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:15:05,583 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 14:15:06,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:06,232 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 14:15:06,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 14:15:06,234 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 14:15:06,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:06,235 INFO L225 Difference]: With dead ends: 47 [2020-08-21 14:15:06,235 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 14:15:06,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:15:06,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 14:15:06,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 14:15:06,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 14:15:06,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 14:15:06,240 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 14:15:06,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:06,240 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 14:15:06,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 14:15:06,240 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 14:15:06,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:15:06,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:06,241 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:06,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 14:15:06,241 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:06,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:06,242 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 14:15:06,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:06,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251738413] [2020-08-21 14:15:06,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:06,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:07,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:07,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:07,007 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:07,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251738413] [2020-08-21 14:15:07,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:07,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 14:15:07,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876326863] [2020-08-21 14:15:07,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 14:15:07,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:07,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 14:15:07,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:15:07,008 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 14:15:07,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:07,645 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 14:15:07,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 14:15:07,646 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 14:15:07,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:07,647 INFO L225 Difference]: With dead ends: 48 [2020-08-21 14:15:07,647 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 14:15:07,648 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 [2020-08-21 14:15:07,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 14:15:07,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 14:15:07,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 14:15:07,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 14:15:07,653 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 14:15:07,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:07,653 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 14:15:07,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 14:15:07,653 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 14:15:07,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 14:15:07,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:07,654 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:07,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 14:15:07,654 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:07,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:07,655 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 14:15:07,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:07,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404137627] [2020-08-21 14:15:07,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:07,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:08,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:08,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:08,502 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:08,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404137627] [2020-08-21 14:15:08,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:08,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 14:15:08,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222247175] [2020-08-21 14:15:08,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 14:15:08,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:08,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 14:15:08,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:15:08,504 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 14:15:09,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:09,179 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 14:15:09,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 14:15:09,179 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 14:15:09,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:09,180 INFO L225 Difference]: With dead ends: 49 [2020-08-21 14:15:09,180 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 14:15:09,182 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 [2020-08-21 14:15:09,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 14:15:09,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 14:15:09,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 14:15:09,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 14:15:09,186 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 14:15:09,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:09,186 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 14:15:09,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 14:15:09,186 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 14:15:09,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 14:15:09,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:09,187 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:09,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 14:15:09,188 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:09,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:09,188 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 14:15:09,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:09,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615417008] [2020-08-21 14:15:09,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:09,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:10,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:10,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:10,028 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:10,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615417008] [2020-08-21 14:15:10,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:10,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 14:15:10,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490113077] [2020-08-21 14:15:10,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 14:15:10,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:10,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 14:15:10,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:10,030 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 14:15:10,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:10,716 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 14:15:10,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 14:15:10,716 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 14:15:10,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:10,717 INFO L225 Difference]: With dead ends: 50 [2020-08-21 14:15:10,717 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 14:15:10,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:10,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 14:15:10,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 14:15:10,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 14:15:10,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 14:15:10,723 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 14:15:10,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:10,723 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 14:15:10,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 14:15:10,723 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 14:15:10,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 14:15:10,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:10,724 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:10,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 14:15:10,724 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:10,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:10,724 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 14:15:10,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:10,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967356211] [2020-08-21 14:15:10,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:10,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:11,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:11,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:11,595 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:11,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967356211] [2020-08-21 14:15:11,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:11,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 14:15:11,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101766624] [2020-08-21 14:15:11,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 14:15:11,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:11,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 14:15:11,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:11,597 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 14:15:12,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:12,355 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 14:15:12,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 14:15:12,355 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 14:15:12,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:12,356 INFO L225 Difference]: With dead ends: 51 [2020-08-21 14:15:12,356 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 14:15:12,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:12,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 14:15:12,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 14:15:12,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 14:15:12,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 14:15:12,364 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 14:15:12,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:12,364 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 14:15:12,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 14:15:12,364 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 14:15:12,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 14:15:12,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:12,365 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:12,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 14:15:12,365 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:12,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:12,366 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 14:15:12,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:12,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444416736] [2020-08-21 14:15:12,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:12,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:13,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:13,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:13,341 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:13,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444416736] [2020-08-21 14:15:13,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:13,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 14:15:13,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047085847] [2020-08-21 14:15:13,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 14:15:13,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:13,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 14:15:13,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:15:13,343 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 14:15:14,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:14,118 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 14:15:14,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 14:15:14,119 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 14:15:14,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:14,119 INFO L225 Difference]: With dead ends: 52 [2020-08-21 14:15:14,120 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 14:15:14,121 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 [2020-08-21 14:15:14,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 14:15:14,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 14:15:14,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 14:15:14,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 14:15:14,124 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 14:15:14,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:14,125 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 14:15:14,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 14:15:14,125 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 14:15:14,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 14:15:14,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:14,126 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:14,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 14:15:14,126 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:14,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:14,126 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 14:15:14,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:14,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672252902] [2020-08-21 14:15:14,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:14,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:15,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,164 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:15,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672252902] [2020-08-21 14:15:15,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:15,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 14:15:15,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616478323] [2020-08-21 14:15:15,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 14:15:15,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:15,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 14:15:15,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:15,166 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 14:15:16,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:16,007 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 14:15:16,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 14:15:16,009 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 14:15:16,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:16,009 INFO L225 Difference]: With dead ends: 53 [2020-08-21 14:15:16,009 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 14:15:16,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:16,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 14:15:16,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 14:15:16,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 14:15:16,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 14:15:16,014 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 14:15:16,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:16,014 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 14:15:16,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 14:15:16,014 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 14:15:16,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 14:15:16,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:16,015 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:16,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 14:15:16,015 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:16,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:16,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 14:15:16,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:16,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266413146] [2020-08-21 14:15:16,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:17,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,045 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:17,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266413146] [2020-08-21 14:15:17,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:17,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 14:15:17,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473803979] [2020-08-21 14:15:17,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 14:15:17,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:17,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 14:15:17,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:17,048 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 14:15:17,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:17,912 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 14:15:17,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 14:15:17,913 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 14:15:17,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:17,914 INFO L225 Difference]: With dead ends: 54 [2020-08-21 14:15:17,914 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 14:15:17,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:17,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 14:15:17,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 14:15:17,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 14:15:17,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 14:15:17,920 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 14:15:17,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:17,921 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 14:15:17,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 14:15:17,921 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 14:15:17,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 14:15:17,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:17,922 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:17,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 14:15:17,922 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:17,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:17,923 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 14:15:17,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:17,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340424289] [2020-08-21 14:15:17,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:17,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:19,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,022 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:19,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340424289] [2020-08-21 14:15:19,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:19,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 14:15:19,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182460648] [2020-08-21 14:15:19,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 14:15:19,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:19,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 14:15:19,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:19,024 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 14:15:19,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:19,948 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 14:15:19,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 14:15:19,949 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 14:15:19,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:19,950 INFO L225 Difference]: With dead ends: 55 [2020-08-21 14:15:19,950 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 14:15:19,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:19,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 14:15:19,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 14:15:19,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 14:15:19,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 14:15:19,955 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 14:15:19,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:19,955 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 14:15:19,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 14:15:19,955 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 14:15:19,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 14:15:19,956 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:19,956 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:19,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 14:15:19,956 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:19,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:19,957 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 14:15:19,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:19,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179501999] [2020-08-21 14:15:19,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:19,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:21,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:21,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:21,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179501999] [2020-08-21 14:15:21,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:21,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 14:15:21,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840540052] [2020-08-21 14:15:21,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 14:15:21,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:21,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 14:15:21,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:15:21,143 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 14:15:22,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:22,131 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 14:15:22,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 14:15:22,131 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 14:15:22,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:22,132 INFO L225 Difference]: With dead ends: 56 [2020-08-21 14:15:22,132 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 14:15:22,133 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 [2020-08-21 14:15:22,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 14:15:22,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 14:15:22,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 14:15:22,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 14:15:22,136 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 14:15:22,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:22,136 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 14:15:22,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 14:15:22,136 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 14:15:22,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 14:15:22,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:22,137 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:22,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 14:15:22,137 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:22,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:22,137 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 14:15:22,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:22,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335252104] [2020-08-21 14:15:22,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:22,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:23,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:23,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:23,341 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:23,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335252104] [2020-08-21 14:15:23,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:23,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 14:15:23,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559130815] [2020-08-21 14:15:23,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 14:15:23,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:23,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 14:15:23,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:15:23,342 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 14:15:24,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:24,375 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 14:15:24,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 14:15:24,375 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 14:15:24,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:24,376 INFO L225 Difference]: With dead ends: 57 [2020-08-21 14:15:24,376 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 14:15:24,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:15:24,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 14:15:24,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 14:15:24,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 14:15:24,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 14:15:24,382 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 14:15:24,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:24,382 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 14:15:24,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 14:15:24,382 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 14:15:24,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 14:15:24,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:24,383 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:24,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 14:15:24,383 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:24,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:24,383 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 14:15:24,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:24,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563238483] [2020-08-21 14:15:24,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:24,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:25,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:25,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:25,853 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:25,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563238483] [2020-08-21 14:15:25,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:25,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 14:15:25,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746643273] [2020-08-21 14:15:25,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 14:15:25,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:25,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 14:15:25,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 14:15:25,855 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 14:15:26,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:26,939 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 14:15:26,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 14:15:26,940 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 14:15:26,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:26,941 INFO L225 Difference]: With dead ends: 58 [2020-08-21 14:15:26,941 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 14:15:26,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 14:15:26,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 14:15:26,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 14:15:26,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 14:15:26,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 14:15:26,946 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 14:15:26,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:26,947 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 14:15:26,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 14:15:26,947 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 14:15:26,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 14:15:26,947 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:26,947 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:26,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 14:15:26,948 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:26,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:26,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 14:15:26,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:26,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327740017] [2020-08-21 14:15:26,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:26,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:28,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:28,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:28,323 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:28,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327740017] [2020-08-21 14:15:28,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:28,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 14:15:28,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520628347] [2020-08-21 14:15:28,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 14:15:28,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:28,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 14:15:28,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 14:15:28,327 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 14:15:29,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:29,447 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 14:15:29,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 14:15:29,449 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 14:15:29,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:29,449 INFO L225 Difference]: With dead ends: 59 [2020-08-21 14:15:29,450 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 14:15:29,451 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 [2020-08-21 14:15:29,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 14:15:29,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 14:15:29,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 14:15:29,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 14:15:29,454 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 14:15:29,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:29,454 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 14:15:29,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 14:15:29,454 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 14:15:29,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 14:15:29,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:29,455 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:29,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 14:15:29,455 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:29,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:29,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 14:15:29,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:29,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450638106] [2020-08-21 14:15:29,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:29,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:30,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:30,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:30,820 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:30,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450638106] [2020-08-21 14:15:30,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:30,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 14:15:30,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538380017] [2020-08-21 14:15:30,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 14:15:30,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:30,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 14:15:30,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 14:15:30,826 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 14:15:32,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:32,014 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 14:15:32,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 14:15:32,015 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 14:15:32,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:32,016 INFO L225 Difference]: With dead ends: 60 [2020-08-21 14:15:32,016 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 14:15:32,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 14:15:32,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 14:15:32,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 14:15:32,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 14:15:32,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 14:15:32,020 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 14:15:32,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:32,020 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 14:15:32,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 14:15:32,021 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 14:15:32,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 14:15:32,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:32,021 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:32,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 14:15:32,021 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:32,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:32,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 14:15:32,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:32,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207905714] [2020-08-21 14:15:32,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:32,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:33,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:33,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:33,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207905714] [2020-08-21 14:15:33,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:33,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 14:15:33,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752909780] [2020-08-21 14:15:33,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 14:15:33,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:33,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 14:15:33,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 14:15:33,514 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 14:15:34,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:34,760 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 14:15:34,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 14:15:34,761 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 14:15:34,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:34,762 INFO L225 Difference]: With dead ends: 61 [2020-08-21 14:15:34,762 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 14:15:34,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 14:15:34,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 14:15:34,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 14:15:34,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 14:15:34,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 14:15:34,766 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 14:15:34,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:34,767 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 14:15:34,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 14:15:34,767 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 14:15:34,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 14:15:34,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:34,767 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:34,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 14:15:34,767 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:34,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:34,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 14:15:34,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:34,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328097386] [2020-08-21 14:15:34,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:36,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:36,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:36,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:36,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328097386] [2020-08-21 14:15:36,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:36,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 14:15:36,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674200306] [2020-08-21 14:15:36,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 14:15:36,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:36,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 14:15:36,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 14:15:36,257 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 14:15:37,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:37,543 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 14:15:37,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 14:15:37,544 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 14:15:37,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:37,545 INFO L225 Difference]: With dead ends: 62 [2020-08-21 14:15:37,545 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 14:15:37,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 14:15:37,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 14:15:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 14:15:37,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 14:15:37,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 14:15:37,552 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 14:15:37,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:37,552 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 14:15:37,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 14:15:37,553 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 14:15:37,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 14:15:37,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:37,553 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:37,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 14:15:37,554 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:37,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:37,554 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 14:15:37,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:37,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370831194] [2020-08-21 14:15:37,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:37,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:39,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:39,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:39,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:39,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370831194] [2020-08-21 14:15:39,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:39,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 14:15:39,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907295675] [2020-08-21 14:15:39,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 14:15:39,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:39,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 14:15:39,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 14:15:39,160 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 14:15:40,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:40,506 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 14:15:40,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 14:15:40,507 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 14:15:40,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:40,508 INFO L225 Difference]: With dead ends: 63 [2020-08-21 14:15:40,508 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 14:15:40,508 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 [2020-08-21 14:15:40,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 14:15:40,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 14:15:40,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 14:15:40,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 14:15:40,512 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 14:15:40,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:40,513 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 14:15:40,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 14:15:40,513 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 14:15:40,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 14:15:40,513 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:40,514 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:40,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 14:15:40,514 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:40,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:40,514 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 14:15:40,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:40,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152803748] [2020-08-21 14:15:40,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:40,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:42,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:42,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:42,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:42,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152803748] [2020-08-21 14:15:42,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:42,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 14:15:42,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124079127] [2020-08-21 14:15:42,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 14:15:42,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:42,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 14:15:42,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 14:15:42,140 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 14:15:43,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:43,549 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 14:15:43,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 14:15:43,556 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 14:15:43,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:43,557 INFO L225 Difference]: With dead ends: 64 [2020-08-21 14:15:43,557 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 14:15:43,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 14:15:43,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 14:15:43,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 14:15:43,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 14:15:43,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 14:15:43,562 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 14:15:43,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:43,562 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 14:15:43,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 14:15:43,562 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 14:15:43,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 14:15:43,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:43,563 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:43,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 14:15:43,563 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:43,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:43,563 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 14:15:43,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:43,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386587032] [2020-08-21 14:15:43,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:43,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:45,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:45,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:45,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:45,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386587032] [2020-08-21 14:15:45,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:45,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 14:15:45,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4831306] [2020-08-21 14:15:45,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 14:15:45,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:45,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 14:15:45,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 14:15:45,272 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states. [2020-08-21 14:15:46,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:46,720 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-08-21 14:15:46,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 14:15:46,721 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 58 [2020-08-21 14:15:46,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:46,722 INFO L225 Difference]: With dead ends: 65 [2020-08-21 14:15:46,722 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 14:15:46,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 14:15:46,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 14:15:46,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 14:15:46,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 14:15:46,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-08-21 14:15:46,727 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-08-21 14:15:46,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:46,727 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-08-21 14:15:46,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 14:15:46,728 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-08-21 14:15:46,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 14:15:46,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:46,728 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:46,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 14:15:46,729 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:46,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:46,729 INFO L82 PathProgramCache]: Analyzing trace with hash 712317521, now seen corresponding path program 49 times [2020-08-21 14:15:46,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:46,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098641658] [2020-08-21 14:15:46,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:46,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat