/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:02:35,376 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:02:35,379 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:02:35,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:02:35,419 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:02:35,431 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:02:35,433 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:02:35,436 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:02:35,437 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:02:35,440 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:02:35,442 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:02:35,444 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:02:35,444 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:02:35,446 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:02:35,447 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:02:35,450 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:02:35,452 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:02:35,452 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:02:35,454 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:02:35,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:02:35,463 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:02:35,463 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:02:35,465 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:02:35,466 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:02:35,470 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:02:35,480 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:02:35,481 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:02:35,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:02:35,483 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 22:02:35,524 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:02:35,524 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:02:35,526 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:02:35,527 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:02:35,527 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:02:35,527 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:02:35,527 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:02:35,528 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:02:35,528 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:02:35,528 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:02:35,529 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:02:35,529 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:02:35,529 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:02:35,530 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:02:35,530 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:02:35,530 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:02:35,530 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:02:35,531 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:02:35,531 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:02:35,531 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:02:35,531 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:02:35,531 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:35,532 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:02:35,532 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:02:35,532 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:02:35,532 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:02:35,532 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:02:35,533 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:02:35,533 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:02:35,533 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:02:35,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:02:35,875 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:02:35,879 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:02:35,880 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:02:35,881 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:02:35,881 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 22:02:35,941 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52d6db0c6/043eb8d2cc664872b824f960af763e59/FLAGa95abcd1a [2020-08-18 22:02:36,394 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:02:36,395 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 22:02:36,401 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52d6db0c6/043eb8d2cc664872b824f960af763e59/FLAGa95abcd1a [2020-08-18 22:02:36,783 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52d6db0c6/043eb8d2cc664872b824f960af763e59 [2020-08-18 22:02:36,792 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:02:36,794 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:02:36,795 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:36,795 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:02:36,799 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:02:36,800 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:36" (1/1) ... [2020-08-18 22:02:36,803 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1806b88f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:36, skipping insertion in model container [2020-08-18 22:02:36,803 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:36" (1/1) ... [2020-08-18 22:02:36,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:02:36,826 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:02:36,986 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:36,990 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:02:37,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:37,015 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:02:37,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37 WrapperNode [2020-08-18 22:02:37,016 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:37,017 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:02:37,017 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:02:37,017 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:02:37,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,029 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,034 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,116 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,124 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,125 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... [2020-08-18 22:02:37,126 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:02:37,126 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:02:37,127 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:02:37,127 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:02:37,127 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:37,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:02:37,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:02:37,186 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:02:37,186 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:02:37,186 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:02:37,187 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:02:37,187 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:02:37,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:02:37,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:02:37,350 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:02:37,351 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:02:37,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:37 BoogieIcfgContainer [2020-08-18 22:02:37,355 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:02:37,356 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:02:37,356 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:02:37,359 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:02:37,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:02:36" (1/3) ... [2020-08-18 22:02:37,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f8d7c1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:37, skipping insertion in model container [2020-08-18 22:02:37,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:37" (2/3) ... [2020-08-18 22:02:37,361 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f8d7c1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:37, skipping insertion in model container [2020-08-18 22:02:37,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:37" (3/3) ... [2020-08-18 22:02:37,363 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 22:02:37,373 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:02:37,380 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:02:37,394 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:02:37,418 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:02:37,418 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:02:37,418 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:02:37,419 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:02:37,419 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:02:37,419 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:02:37,420 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:02:37,420 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:02:37,439 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 22:02:37,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:02:37,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:37,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:37,449 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:37,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:37,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 22:02:37,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:37,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430898292] [2020-08-18 22:02:37,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:37,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:37,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:37,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430898292] [2020-08-18 22:02:37,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:37,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:02:37,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248375287] [2020-08-18 22:02:37,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:02:37,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:37,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:02:37,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:02:37,714 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 22:02:37,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:37,756 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 22:02:37,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:02:37,765 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 22:02:37,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:37,779 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:02:37,780 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 22:02:37,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:02:37,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 22:02:37,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 22:02:37,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 22:02:37,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 22:02:37,818 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 22:02:37,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:37,819 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 22:02:37,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:02:37,823 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 22:02:37,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 22:02:37,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:37,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:37,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:02:37,828 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:37,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:37,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 22:02:37,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:37,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449663114] [2020-08-18 22:02:37,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:37,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:37,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:37,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449663114] [2020-08-18 22:02:37,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:37,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 22:02:37,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438189568] [2020-08-18 22:02:37,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:02:37,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:37,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:02:37,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:37,931 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 22:02:37,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:37,968 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 22:02:37,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:02:37,969 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 22:02:37,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:37,970 INFO L225 Difference]: With dead ends: 18 [2020-08-18 22:02:37,970 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 22:02:37,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:37,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 22:02:37,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 22:02:37,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 22:02:37,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 22:02:37,980 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 22:02:37,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:37,981 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 22:02:37,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:02:37,981 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 22:02:37,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:02:37,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:37,982 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:37,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:02:37,983 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:37,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:37,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 22:02:37,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:37,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863410351] [2020-08-18 22:02:37,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,106 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863410351] [2020-08-18 22:02:38,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:02:38,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334319163] [2020-08-18 22:02:38,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:38,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:38,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:38,109 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 22:02:38,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,133 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 22:02:38,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:38,134 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 22:02:38,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,135 INFO L225 Difference]: With dead ends: 19 [2020-08-18 22:02:38,135 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 22:02:38,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:38,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 22:02:38,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 22:02:38,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 22:02:38,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 22:02:38,141 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 22:02:38,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,142 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 22:02:38,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:38,142 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 22:02:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 22:02:38,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,143 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:02:38,144 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 22:02:38,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677565596] [2020-08-18 22:02:38,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677565596] [2020-08-18 22:02:38,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:02:38,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488877201] [2020-08-18 22:02:38,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:02:38,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:02:38,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:38,257 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 22:02:38,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,286 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 22:02:38,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:38,286 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 22:02:38,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,287 INFO L225 Difference]: With dead ends: 20 [2020-08-18 22:02:38,287 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 22:02:38,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:38,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 22:02:38,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 22:02:38,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:02:38,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 22:02:38,293 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 22:02:38,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,293 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 22:02:38,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:02:38,294 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 22:02:38,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 22:02:38,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,295 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:02:38,295 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 22:02:38,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167168994] [2020-08-18 22:02:38,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,416 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167168994] [2020-08-18 22:02:38,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:02:38,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442839326] [2020-08-18 22:02:38,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:02:38,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:02:38,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:38,421 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 22:02:38,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,478 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 22:02:38,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:02:38,480 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 22:02:38,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,481 INFO L225 Difference]: With dead ends: 21 [2020-08-18 22:02:38,481 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:02:38,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:38,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:02:38,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 22:02:38,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:02:38,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 22:02:38,494 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 22:02:38,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,494 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 22:02:38,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:02:38,494 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 22:02:38,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:02:38,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,495 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:02:38,496 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 22:02:38,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065214575] [2020-08-18 22:02:38,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,662 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065214575] [2020-08-18 22:02:38,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:38,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36398407] [2020-08-18 22:02:38,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:38,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:38,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:38,664 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 22:02:38,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,713 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 22:02:38,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:02:38,713 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 22:02:38,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,714 INFO L225 Difference]: With dead ends: 22 [2020-08-18 22:02:38,714 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 22:02:38,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:38,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 22:02:38,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 22:02:38,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:02:38,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 22:02:38,721 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 22:02:38,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,721 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 22:02:38,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:02:38,721 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 22:02:38,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:02:38,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,722 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:02:38,723 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 22:02:38,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126538374] [2020-08-18 22:02:38,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,880 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126538374] [2020-08-18 22:02:38,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:02:38,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265612754] [2020-08-18 22:02:38,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:02:38,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:02:38,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:02:38,883 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 22:02:38,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,935 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 22:02:38,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:02:38,936 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 22:02:38,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,937 INFO L225 Difference]: With dead ends: 23 [2020-08-18 22:02:38,937 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 22:02:38,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:02:38,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 22:02:38,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 22:02:38,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 22:02:38,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 22:02:38,943 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 22:02:38,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,943 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 22:02:38,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:02:38,943 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 22:02:38,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:02:38,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,944 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:02:38,945 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,945 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 22:02:38,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561442513] [2020-08-18 22:02:38,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:39,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:39,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561442513] [2020-08-18 22:02:39,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:39,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:02:39,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299076724] [2020-08-18 22:02:39,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:02:39,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:39,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:02:39,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:39,150 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 22:02:39,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:39,225 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 22:02:39,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:02:39,226 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 22:02:39,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:39,227 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:02:39,227 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 22:02:39,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:39,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 22:02:39,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 22:02:39,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:02:39,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 22:02:39,236 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 22:02:39,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:39,236 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 22:02:39,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:02:39,237 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 22:02:39,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:02:39,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:39,238 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:39,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:02:39,239 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:39,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:39,239 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 22:02:39,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:39,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917841675] [2020-08-18 22:02:39,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:39,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:39,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,453 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:39,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917841675] [2020-08-18 22:02:39,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:39,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:02:39,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591683832] [2020-08-18 22:02:39,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:02:39,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:39,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:02:39,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:02:39,457 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 22:02:39,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:39,548 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 22:02:39,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:02:39,550 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 22:02:39,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:39,551 INFO L225 Difference]: With dead ends: 25 [2020-08-18 22:02:39,551 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:02:39,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:02:39,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:02:39,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 22:02:39,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:02:39,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 22:02:39,562 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 22:02:39,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:39,563 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 22:02:39,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:02:39,568 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 22:02:39,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:02:39,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:39,569 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:39,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:02:39,569 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:39,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:39,570 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 22:02:39,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:39,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180250157] [2020-08-18 22:02:39,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:39,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:39,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,799 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:39,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180250157] [2020-08-18 22:02:39,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:39,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:02:39,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740747542] [2020-08-18 22:02:39,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:02:39,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:39,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:02:39,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:02:39,801 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 22:02:39,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:39,892 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 22:02:39,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:02:39,893 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 22:02:39,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:39,894 INFO L225 Difference]: With dead ends: 26 [2020-08-18 22:02:39,894 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 22:02:39,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:02:39,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 22:02:39,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 22:02:39,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 22:02:39,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 22:02:39,904 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 22:02:39,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:39,904 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 22:02:39,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:02:39,905 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 22:02:39,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:02:39,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:39,906 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:39,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:02:39,906 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:39,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:39,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 22:02:39,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:39,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374366297] [2020-08-18 22:02:39,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:39,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:40,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,160 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:40,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374366297] [2020-08-18 22:02:40,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:40,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:02:40,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079532716] [2020-08-18 22:02:40,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:02:40,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:40,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:02:40,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:40,162 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 22:02:40,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:40,271 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 22:02:40,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:02:40,272 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 22:02:40,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:40,273 INFO L225 Difference]: With dead ends: 27 [2020-08-18 22:02:40,273 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:02:40,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:40,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:02:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 22:02:40,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:02:40,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 22:02:40,278 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 22:02:40,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:40,279 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 22:02:40,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:02:40,279 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 22:02:40,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:02:40,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:40,280 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:40,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:02:40,280 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:40,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:40,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 22:02:40,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:40,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831091128] [2020-08-18 22:02:40,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:40,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:40,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:40,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831091128] [2020-08-18 22:02:40,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:40,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:02:40,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747486418] [2020-08-18 22:02:40,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:02:40,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:40,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:02:40,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:40,484 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 22:02:40,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:40,589 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 22:02:40,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:02:40,592 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 22:02:40,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:40,596 INFO L225 Difference]: With dead ends: 28 [2020-08-18 22:02:40,596 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:02:40,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:40,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:02:40,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 22:02:40,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:02:40,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 22:02:40,604 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 22:02:40,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:40,604 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 22:02:40,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:02:40,605 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 22:02:40,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:02:40,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:40,607 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:40,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:02:40,608 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:40,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:40,608 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 22:02:40,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:40,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868551526] [2020-08-18 22:02:40,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:40,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:40,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:40,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868551526] [2020-08-18 22:02:40,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:40,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:02:40,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687948275] [2020-08-18 22:02:40,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:02:40,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:40,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:02:40,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:02:40,870 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 22:02:41,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:41,027 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 22:02:41,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:02:41,027 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 22:02:41,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:41,028 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:02:41,029 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:02:41,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:02:41,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:02:41,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 22:02:41,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 22:02:41,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 22:02:41,038 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 22:02:41,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:41,038 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 22:02:41,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:02:41,040 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 22:02:41,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 22:02:41,041 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:41,041 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:41,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:02:41,041 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:41,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:41,042 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 22:02:41,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:41,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312030897] [2020-08-18 22:02:41,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:41,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:41,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,307 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:41,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312030897] [2020-08-18 22:02:41,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:41,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:02:41,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510462868] [2020-08-18 22:02:41,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:02:41,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:41,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:02:41,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:02:41,310 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 22:02:41,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:41,459 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 22:02:41,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:02:41,460 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 22:02:41,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:41,461 INFO L225 Difference]: With dead ends: 30 [2020-08-18 22:02:41,461 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:02:41,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:02:41,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:02:41,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 22:02:41,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:02:41,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 22:02:41,467 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 22:02:41,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:41,467 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 22:02:41,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:02:41,467 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 22:02:41,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:02:41,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:41,468 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:41,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:02:41,469 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:41,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:41,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 22:02:41,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:41,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268586830] [2020-08-18 22:02:41,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:41,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:41,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,737 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:41,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268586830] [2020-08-18 22:02:41,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:41,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:02:41,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251366579] [2020-08-18 22:02:41,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:02:41,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:41,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:02:41,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:02:41,740 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 22:02:41,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:41,907 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 22:02:41,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:02:41,908 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 22:02:41,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:41,909 INFO L225 Difference]: With dead ends: 31 [2020-08-18 22:02:41,909 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:02:41,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:02:41,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:02:41,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 22:02:41,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:02:41,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 22:02:41,919 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 22:02:41,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:41,920 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 22:02:41,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:02:41,920 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 22:02:41,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:02:41,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:41,921 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:41,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:02:41,921 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:41,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:41,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 22:02:41,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:41,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313961765] [2020-08-18 22:02:41,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:41,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:42,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,237 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:42,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313961765] [2020-08-18 22:02:42,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:42,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:02:42,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475709830] [2020-08-18 22:02:42,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:02:42,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:42,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:02:42,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:02:42,240 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 22:02:42,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:42,430 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 22:02:42,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:02:42,431 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 22:02:42,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:42,432 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:02:42,432 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 22:02:42,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:02:42,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 22:02:42,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 22:02:42,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 22:02:42,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 22:02:42,438 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 22:02:42,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:42,438 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 22:02:42,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:02:42,439 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 22:02:42,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:02:42,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:42,440 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:42,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:02:42,440 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:42,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:42,441 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 22:02:42,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:42,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248699477] [2020-08-18 22:02:42,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:42,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:42,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,773 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:42,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248699477] [2020-08-18 22:02:42,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:42,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:02:42,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129076223] [2020-08-18 22:02:42,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:02:42,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:42,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:02:42,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:02:42,775 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 22:02:42,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:42,992 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 22:02:42,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:02:42,993 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 22:02:42,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:42,994 INFO L225 Difference]: With dead ends: 33 [2020-08-18 22:02:42,994 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:02:42,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:02:42,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:02:42,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 22:02:42,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:02:42,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 22:02:42,999 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 22:02:43,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:43,000 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 22:02:43,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:02:43,000 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 22:02:43,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:02:43,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:43,001 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:43,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:02:43,002 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:43,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:43,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 22:02:43,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:43,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278684999] [2020-08-18 22:02:43,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:43,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:43,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,350 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:43,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278684999] [2020-08-18 22:02:43,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:43,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:02:43,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30076028] [2020-08-18 22:02:43,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:02:43,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:43,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:02:43,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:02:43,353 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 22:02:43,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:43,578 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 22:02:43,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:02:43,579 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 22:02:43,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:43,579 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:02:43,580 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:02:43,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:02:43,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:02:43,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 22:02:43,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:02:43,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 22:02:43,586 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 22:02:43,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:43,587 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 22:02:43,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:02:43,587 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 22:02:43,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:02:43,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:43,588 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:43,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:02:43,588 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:43,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:43,589 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 22:02:43,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:43,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059300753] [2020-08-18 22:02:43,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:43,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:43,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,942 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:43,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059300753] [2020-08-18 22:02:43,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:43,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:02:43,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400109879] [2020-08-18 22:02:43,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:02:43,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:43,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:02:43,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:02:43,944 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 22:02:44,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:44,185 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 22:02:44,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:02:44,186 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 22:02:44,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:44,187 INFO L225 Difference]: With dead ends: 35 [2020-08-18 22:02:44,187 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:02:44,188 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 [2020-08-18 22:02:44,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:02:44,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 22:02:44,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 22:02:44,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 22:02:44,193 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 22:02:44,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:44,194 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 22:02:44,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:02:44,194 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 22:02:44,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:02:44,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:44,195 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:44,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:02:44,195 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:44,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:44,195 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 22:02:44,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:44,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95252211] [2020-08-18 22:02:44,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:44,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:44,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,610 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:44,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95252211] [2020-08-18 22:02:44,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:44,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:02:44,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540858378] [2020-08-18 22:02:44,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:02:44,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:44,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:02:44,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:02:44,613 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 22:02:44,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:44,864 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 22:02:44,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:02:44,864 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 22:02:44,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:44,865 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:02:44,865 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:02:44,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:02:44,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:02:44,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 22:02:44,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:02:44,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 22:02:44,873 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 22:02:44,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:44,874 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 22:02:44,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:02:44,874 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 22:02:44,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:02:44,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:44,875 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:44,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:02:44,875 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:44,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:44,876 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 22:02:44,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:44,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370344648] [2020-08-18 22:02:44,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:44,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:45,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:45,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:45,308 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:45,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370344648] [2020-08-18 22:02:45,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:45,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:02:45,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104719903] [2020-08-18 22:02:45,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:02:45,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:45,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:02:45,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:02:45,310 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 22:02:45,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:45,597 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 22:02:45,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:02:45,597 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 22:02:45,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:45,598 INFO L225 Difference]: With dead ends: 37 [2020-08-18 22:02:45,599 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:02:45,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:02:45,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:02:45,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 22:02:45,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 22:02:45,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 22:02:45,604 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 22:02:45,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:45,605 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 22:02:45,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:02:45,605 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 22:02:45,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:02:45,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:45,606 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:45,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:02:45,606 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:45,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:45,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 22:02:45,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:45,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430474294] [2020-08-18 22:02:45,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:45,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:46,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,059 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:46,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430474294] [2020-08-18 22:02:46,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:46,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:02:46,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435624911] [2020-08-18 22:02:46,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:02:46,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:46,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:02:46,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:46,061 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 22:02:46,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:46,363 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 22:02:46,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:02:46,363 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 22:02:46,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:46,364 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:02:46,364 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:02:46,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:46,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:02:46,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 22:02:46,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 22:02:46,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 22:02:46,369 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 22:02:46,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:46,370 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 22:02:46,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:02:46,370 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 22:02:46,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 22:02:46,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:46,371 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:46,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:02:46,371 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:46,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:46,371 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 22:02:46,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:46,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981775227] [2020-08-18 22:02:46,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:46,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:46,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,832 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:46,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981775227] [2020-08-18 22:02:46,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:46,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:02:46,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867911383] [2020-08-18 22:02:46,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:02:46,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:46,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:02:46,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:02:46,841 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 22:02:47,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:47,173 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 22:02:47,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:02:47,174 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 22:02:47,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:47,175 INFO L225 Difference]: With dead ends: 39 [2020-08-18 22:02:47,175 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:02:47,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:02:47,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:02:47,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 22:02:47,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:02:47,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 22:02:47,191 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 22:02:47,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:47,191 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 22:02:47,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:02:47,191 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 22:02:47,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:02:47,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:47,192 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:47,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:02:47,192 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:47,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:47,193 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 22:02:47,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:47,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94018104] [2020-08-18 22:02:47,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:47,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:47,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,708 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:47,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94018104] [2020-08-18 22:02:47,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:47,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:02:47,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337541332] [2020-08-18 22:02:47,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:02:47,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:47,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:02:47,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:02:47,710 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 22:02:48,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:48,125 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 22:02:48,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:02:48,126 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 22:02:48,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:48,126 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:02:48,126 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 22:02:48,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:02:48,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 22:02:48,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 22:02:48,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:02:48,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 22:02:48,131 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 22:02:48,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:48,132 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 22:02:48,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:02:48,132 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 22:02:48,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:02:48,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:48,133 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:48,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:02:48,133 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:48,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:48,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 22:02:48,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:48,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991461792] [2020-08-18 22:02:48,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:48,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:48,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:48,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:48,696 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:48,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991461792] [2020-08-18 22:02:48,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:48,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:02:48,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757152917] [2020-08-18 22:02:48,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:02:48,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:48,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:02:48,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:02:48,700 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 22:02:49,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:49,065 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 22:02:49,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:02:49,066 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 22:02:49,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:49,066 INFO L225 Difference]: With dead ends: 41 [2020-08-18 22:02:49,066 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 22:02:49,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:02:49,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 22:02:49,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 22:02:49,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 22:02:49,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 22:02:49,072 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 22:02:49,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:49,072 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 22:02:49,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:02:49,072 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 22:02:49,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 22:02:49,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:49,073 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:49,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:02:49,073 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:49,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:49,074 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 22:02:49,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:49,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [496369898] [2020-08-18 22:02:49,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:49,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:49,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:49,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:49,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [496369898] [2020-08-18 22:02:49,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:49,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:02:49,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523241916] [2020-08-18 22:02:49,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:02:49,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:49,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:02:49,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:02:49,686 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 22:02:50,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:50,132 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 22:02:50,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:02:50,132 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 22:02:50,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:50,133 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:02:50,133 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:02:50,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:02:50,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:02:50,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 22:02:50,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:02:50,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 22:02:50,138 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 22:02:50,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:50,140 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 22:02:50,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:02:50,140 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 22:02:50,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:02:50,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:50,141 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:50,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:02:50,141 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:50,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:50,143 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 22:02:50,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:50,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933515747] [2020-08-18 22:02:50,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:50,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:50,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,727 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:50,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933515747] [2020-08-18 22:02:50,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:50,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:02:50,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594954172] [2020-08-18 22:02:50,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:02:50,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:50,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:02:50,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:02:50,729 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 22:02:51,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:51,200 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 22:02:51,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:02:51,208 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 22:02:51,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:51,209 INFO L225 Difference]: With dead ends: 43 [2020-08-18 22:02:51,209 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:02:51,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:02:51,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:02:51,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 22:02:51,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 22:02:51,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 22:02:51,214 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 22:02:51,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:51,215 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 22:02:51,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:02:51,215 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 22:02:51,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 22:02:51,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:51,216 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:51,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:02:51,216 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:51,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:51,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 22:02:51,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:51,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373112394] [2020-08-18 22:02:51,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:51,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:51,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:51,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:51,839 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:51,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373112394] [2020-08-18 22:02:51,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:51,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:02:51,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912364306] [2020-08-18 22:02:51,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:02:51,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:51,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:02:51,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:02:51,841 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 22:02:52,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:52,359 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 22:02:52,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:02:52,359 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 22:02:52,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:52,360 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:02:52,360 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 22:02:52,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:02:52,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 22:02:52,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 22:02:52,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:02:52,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 22:02:52,367 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 22:02:52,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:52,367 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 22:02:52,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:02:52,367 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 22:02:52,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 22:02:52,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:52,368 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:52,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:02:52,368 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:52,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:52,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 22:02:52,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:52,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869712658] [2020-08-18 22:02:52,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:52,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:53,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,023 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:53,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869712658] [2020-08-18 22:02:53,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:53,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:02:53,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425917398] [2020-08-18 22:02:53,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:02:53,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:53,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:02:53,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:53,025 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 22:02:53,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:53,589 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 22:02:53,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:02:53,590 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 22:02:53,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:53,591 INFO L225 Difference]: With dead ends: 45 [2020-08-18 22:02:53,591 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:02:53,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:53,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:02:53,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 22:02:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:02:53,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 22:02:53,596 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 22:02:53,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:53,597 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 22:02:53,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:02:53,597 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 22:02:53,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:02:53,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:53,597 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:53,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:02:53,598 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:53,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:53,598 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 22:02:53,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:53,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748853839] [2020-08-18 22:02:53,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:53,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:54,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:54,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:54,308 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:54,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748853839] [2020-08-18 22:02:54,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:54,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:02:54,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474075991] [2020-08-18 22:02:54,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:02:54,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:54,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:02:54,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:02:54,310 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 22:02:54,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:54,893 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 22:02:54,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:02:54,894 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 22:02:54,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:54,895 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:02:54,895 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:02:54,896 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 [2020-08-18 22:02:54,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:02:54,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 22:02:54,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:02:54,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 22:02:54,900 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 22:02:54,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:54,900 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 22:02:54,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:02:54,900 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 22:02:54,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 22:02:54,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:54,901 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:54,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:02:54,901 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:54,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:54,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 22:02:54,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:54,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957248530] [2020-08-18 22:02:54,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:54,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:55,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:55,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:55,710 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:55,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957248530] [2020-08-18 22:02:55,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:55,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:02:55,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618179637] [2020-08-18 22:02:55,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:02:55,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:55,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:02:55,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:55,712 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 22:02:56,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:56,353 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 22:02:56,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:02:56,355 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 22:02:56,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:56,356 INFO L225 Difference]: With dead ends: 47 [2020-08-18 22:02:56,356 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 22:02:56,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:56,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 22:02:56,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 22:02:56,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 22:02:56,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 22:02:56,360 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 22:02:56,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:56,360 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 22:02:56,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:02:56,360 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 22:02:56,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 22:02:56,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:56,361 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:56,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:02:56,362 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:56,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:56,362 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 22:02:56,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:56,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823874047] [2020-08-18 22:02:56,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:56,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:57,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,167 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:57,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823874047] [2020-08-18 22:02:57,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:57,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:02:57,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030141564] [2020-08-18 22:02:57,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:02:57,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:57,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:02:57,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:57,169 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 22:02:57,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:57,861 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 22:02:57,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:02:57,862 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 22:02:57,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:57,863 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:02:57,863 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:02:57,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:57,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:02:57,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 22:02:57,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:02:57,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 22:02:57,869 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 22:02:57,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:57,870 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 22:02:57,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:02:57,870 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 22:02:57,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:02:57,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:57,870 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:57,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:02:57,871 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:57,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:57,871 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 22:02:57,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:57,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106791251] [2020-08-18 22:02:57,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:57,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:58,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,778 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:58,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106791251] [2020-08-18 22:02:58,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:58,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:02:58,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094022607] [2020-08-18 22:02:58,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:02:58,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:58,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:02:58,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:02:58,780 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 22:02:59,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,506 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 22:02:59,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:02:59,507 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 22:02:59,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,508 INFO L225 Difference]: With dead ends: 49 [2020-08-18 22:02:59,508 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 22:02:59,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:02:59,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 22:02:59,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 22:02:59,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 22:02:59,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 22:02:59,515 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 22:02:59,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,515 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 22:02:59,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:02:59,515 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 22:02:59,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 22:02:59,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,516 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:02:59,516 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,516 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 22:02:59,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23630542] [2020-08-18 22:02:59,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,413 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:00,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23630542] [2020-08-18 22:03:00,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:03:00,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314347448] [2020-08-18 22:03:00,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:03:00,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:03:00,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:03:00,415 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 22:03:01,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:01,181 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 22:03:01,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:03:01,182 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 22:03:01,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:01,183 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:03:01,183 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 22:03:01,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:03:01,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 22:03:01,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 22:03:01,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 22:03:01,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 22:03:01,188 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 22:03:01,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:01,189 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 22:03:01,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:03:01,189 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 22:03:01,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:03:01,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:01,189 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:01,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:03:01,189 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:01,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:01,190 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 22:03:01,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:01,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385283129] [2020-08-18 22:03:01,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:02,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,175 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:02,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385283129] [2020-08-18 22:03:02,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:02,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:03:02,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907970263] [2020-08-18 22:03:02,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:03:02,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:02,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:03:02,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:03:02,178 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 22:03:02,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:02,974 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 22:03:02,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:03:02,974 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 22:03:02,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:02,975 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:03:02,975 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:03:02,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:03:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:03:02,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 22:03:02,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:03:02,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 22:03:02,980 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 22:03:02,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:02,980 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 22:03:02,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:03:02,980 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 22:03:02,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:03:02,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:02,981 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:02,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:03:02,981 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:02,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:02,982 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 22:03:02,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:02,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151683964] [2020-08-18 22:03:02,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:02,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,042 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:04,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151683964] [2020-08-18 22:03:04,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:04,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:03:04,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063839968] [2020-08-18 22:03:04,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:03:04,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:03:04,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:03:04,045 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 22:03:04,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,885 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 22:03:04,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:03:04,885 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 22:03:04,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,886 INFO L225 Difference]: With dead ends: 52 [2020-08-18 22:03:04,886 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 22:03:04,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:03:04,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 22:03:04,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 22:03:04,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 22:03:04,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 22:03:04,890 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 22:03:04,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,890 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 22:03:04,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:03:04,891 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 22:03:04,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 22:03:04,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,891 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:03:04,892 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,892 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 22:03:04,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472216607] [2020-08-18 22:03:04,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:05,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,968 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:05,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472216607] [2020-08-18 22:03:05,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:05,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:03:05,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016700927] [2020-08-18 22:03:05,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:03:05,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:05,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:03:05,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:03:05,970 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 22:03:06,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:06,884 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 22:03:06,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:03:06,885 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 22:03:06,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:06,886 INFO L225 Difference]: With dead ends: 53 [2020-08-18 22:03:06,886 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 22:03:06,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:03:06,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 22:03:06,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 22:03:06,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 22:03:06,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 22:03:06,890 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 22:03:06,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:06,891 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 22:03:06,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:03:06,891 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 22:03:06,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 22:03:06,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:06,891 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:06,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:03:06,892 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:06,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:06,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 22:03:06,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:06,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235185944] [2020-08-18 22:03:06,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:06,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:08,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,030 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:08,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235185944] [2020-08-18 22:03:08,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:08,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:03:08,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962709781] [2020-08-18 22:03:08,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:03:08,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:08,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:03:08,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:03:08,032 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 22:03:08,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:08,973 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 22:03:08,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:03:08,974 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 22:03:08,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:08,975 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:03:08,975 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:03:08,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:03:08,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:03:08,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 22:03:08,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:03:08,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 22:03:08,979 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 22:03:08,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:08,979 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 22:03:08,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:03:08,980 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 22:03:08,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:03:08,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:08,980 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:08,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:03:08,981 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:08,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:08,981 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 22:03:08,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:08,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414795634] [2020-08-18 22:03:08,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:08,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:10,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:10,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414795634] [2020-08-18 22:03:10,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:10,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:03:10,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636596548] [2020-08-18 22:03:10,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:03:10,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:10,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:03:10,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:03:10,204 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 22:03:11,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:11,244 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 22:03:11,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:03:11,245 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 22:03:11,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:11,246 INFO L225 Difference]: With dead ends: 55 [2020-08-18 22:03:11,246 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 22:03:11,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:03:11,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 22:03:11,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 22:03:11,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 22:03:11,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 22:03:11,251 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 22:03:11,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:11,251 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 22:03:11,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:03:11,251 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 22:03:11,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 22:03:11,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:11,252 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:11,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:03:11,252 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:11,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:11,253 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 22:03:11,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:11,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905108191] [2020-08-18 22:03:11,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:11,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:12,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,454 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:12,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905108191] [2020-08-18 22:03:12,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:12,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:03:12,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463578914] [2020-08-18 22:03:12,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:03:12,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:12,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:03:12,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:03:12,456 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 22:03:13,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:13,548 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 22:03:13,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:03:13,549 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 22:03:13,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:13,550 INFO L225 Difference]: With dead ends: 56 [2020-08-18 22:03:13,550 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 22:03:13,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:03:13,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 22:03:13,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 22:03:13,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 22:03:13,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 22:03:13,554 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 22:03:13,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:13,554 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 22:03:13,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:03:13,554 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 22:03:13,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 22:03:13,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:13,554 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:13,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:03:13,555 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:13,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:13,555 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 22:03:13,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:13,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570666568] [2020-08-18 22:03:13,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:13,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:14,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:14,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:14,833 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:14,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570666568] [2020-08-18 22:03:14,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:14,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:03:14,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782456879] [2020-08-18 22:03:14,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:03:14,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:14,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:03:14,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:03:14,836 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 22:03:15,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:15,993 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 22:03:15,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:03:15,994 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 22:03:15,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:15,995 INFO L225 Difference]: With dead ends: 57 [2020-08-18 22:03:15,995 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:03:15,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:03:15,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:03:16,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 22:03:16,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:03:16,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 22:03:16,001 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 22:03:16,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:16,001 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 22:03:16,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:03:16,001 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 22:03:16,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:03:16,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:16,002 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:16,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 22:03:16,002 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:16,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:16,002 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 22:03:16,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:16,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370416132] [2020-08-18 22:03:16,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:16,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:17,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:17,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:17,239 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:17,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370416132] [2020-08-18 22:03:17,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:17,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 22:03:17,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372690830] [2020-08-18 22:03:17,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 22:03:17,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:17,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 22:03:17,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:03:17,241 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 22:03:18,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:18,425 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 22:03:18,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 22:03:18,428 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 22:03:18,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:18,429 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:03:18,429 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 22:03:18,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:03:18,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 22:03:18,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 22:03:18,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 22:03:18,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 22:03:18,434 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 22:03:18,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:18,434 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 22:03:18,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 22:03:18,435 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 22:03:18,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 22:03:18,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:18,435 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:18,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 22:03:18,435 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:18,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:18,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 22:03:18,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:18,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110676014] [2020-08-18 22:03:18,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:18,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:19,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:19,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:19,980 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:19,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110676014] [2020-08-18 22:03:19,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:19,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 22:03:19,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150019347] [2020-08-18 22:03:19,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 22:03:19,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:19,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 22:03:19,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:03:19,983 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 22:03:21,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:21,244 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 22:03:21,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 22:03:21,247 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 22:03:21,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:21,248 INFO L225 Difference]: With dead ends: 59 [2020-08-18 22:03:21,248 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 22:03:21,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:03:21,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 22:03:21,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 22:03:21,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 22:03:21,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 22:03:21,253 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 22:03:21,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:21,253 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 22:03:21,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 22:03:21,253 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 22:03:21,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 22:03:21,254 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:21,254 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:21,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 22:03:21,254 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:21,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:21,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 22:03:21,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:21,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810686514] [2020-08-18 22:03:21,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:21,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:22,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,718 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:22,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810686514] [2020-08-18 22:03:22,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:22,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 22:03:22,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122397057] [2020-08-18 22:03:22,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 22:03:22,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:22,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 22:03:22,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:03:22,720 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 22:03:24,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:24,037 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 22:03:24,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 22:03:24,038 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 22:03:24,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:24,039 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:03:24,039 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:03:24,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:03:24,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:03:24,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 22:03:24,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:03:24,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 22:03:24,043 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 22:03:24,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:24,043 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 22:03:24,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 22:03:24,043 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 22:03:24,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:03:24,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:24,043 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:24,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 22:03:24,044 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:24,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:24,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 22:03:24,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:24,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920022146] [2020-08-18 22:03:24,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:24,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:25,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,574 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:25,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920022146] [2020-08-18 22:03:25,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:25,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 22:03:25,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123284799] [2020-08-18 22:03:25,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 22:03:25,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:25,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 22:03:25,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 22:03:25,575 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 22:03:26,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:26,998 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 22:03:26,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 22:03:26,999 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 22:03:26,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:27,000 INFO L225 Difference]: With dead ends: 61 [2020-08-18 22:03:27,000 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 22:03:27,000 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 [2020-08-18 22:03:27,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 22:03:27,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 22:03:27,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 22:03:27,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 22:03:27,005 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 22:03:27,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:27,005 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 22:03:27,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 22:03:27,005 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 22:03:27,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 22:03:27,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:27,006 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:27,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 22:03:27,006 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:27,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:27,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 22:03:27,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:27,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571817531] [2020-08-18 22:03:27,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:27,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:28,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:28,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:28,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:28,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571817531] [2020-08-18 22:03:28,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:28,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 22:03:28,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577488710] [2020-08-18 22:03:28,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 22:03:28,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:28,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 22:03:28,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:03:28,673 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 22:03:30,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:30,105 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 22:03:30,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 22:03:30,106 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 22:03:30,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:30,107 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:03:30,107 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 22:03:30,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:03:30,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 22:03:30,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 22:03:30,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 22:03:30,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 22:03:30,112 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 22:03:30,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:30,112 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 22:03:30,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 22:03:30,112 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 22:03:30,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 22:03:30,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:30,113 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:30,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 22:03:30,113 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:30,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:30,114 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 22:03:30,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:30,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458628216] [2020-08-18 22:03:30,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:30,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:31,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:31,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:31,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:31,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458628216] [2020-08-18 22:03:31,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:31,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 22:03:31,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451675101] [2020-08-18 22:03:31,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 22:03:31,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:31,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 22:03:31,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:03:31,774 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 22:03:33,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:33,308 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 22:03:33,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 22:03:33,309 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 22:03:33,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:33,309 INFO L225 Difference]: With dead ends: 63 [2020-08-18 22:03:33,310 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:03:33,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:03:33,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:03:33,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 22:03:33,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:03:33,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 22:03:33,315 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 22:03:33,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:33,315 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 22:03:33,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 22:03:33,316 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 22:03:33,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:03:33,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:33,316 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:33,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 22:03:33,316 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:33,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:33,316 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 22:03:33,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:33,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594155319] [2020-08-18 22:03:33,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:33,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:35,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:35,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:35,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:35,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594155319] [2020-08-18 22:03:35,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:35,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 22:03:35,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139044542] [2020-08-18 22:03:35,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 22:03:35,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:35,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 22:03:35,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 22:03:35,071 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 22:03:36,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:36,663 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 22:03:36,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 22:03:36,664 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 22:03:36,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:36,665 INFO L225 Difference]: With dead ends: 64 [2020-08-18 22:03:36,665 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 22:03:36,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 22:03:36,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 22:03:36,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 22:03:36,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 22:03:36,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 22:03:36,670 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 22:03:36,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:36,670 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 22:03:36,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 22:03:36,671 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 22:03:36,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 22:03:36,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:36,671 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:36,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 22:03:36,671 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:36,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:36,672 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 22:03:36,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:36,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626038877] [2020-08-18 22:03:36,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:36,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat