/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:18:45,256 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 22:18:45,283 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:18:45,284 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:18:45,285 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:18:45,287 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:18:45,289 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:18:45,290 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:18:45,291 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:18:45,292 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:18:45,292 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:18:45,293 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:18:45,294 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:18:45,295 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:18:45,296 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:18:45,297 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:18:45,299 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:18:45,301 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:18:45,302 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:18:45,303 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:18:45,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:18:45,305 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:18:45,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 22:18:45,315 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:18:45,316 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:18:45,317 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:18:45,318 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 22:18:45,340 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:18:45,340 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:18:45,341 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:18:45,341 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:18:45,341 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:18:45,342 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:18:45,344 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:18:45,345 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:18:45,345 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:18:45,345 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:18:45,345 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:18:45,345 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:18:45,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:18:45,346 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:18:45,346 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:18:45,346 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:18:45,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:45,346 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:18:45,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:18:45,347 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:18:45,347 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:18:45,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:18:45,347 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:18:45,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:18:45,348 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=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:18:45,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:18:45,711 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:18:45,714 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:18:45,716 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:18:45,717 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:18:45,718 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 22:18:45,801 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2f6d686ab/f0b9d8f3c7c44acab00a51e7c6ddcf93/FLAG739c5a21d [2020-08-21 22:18:46,205 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:18:46,206 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 22:18:46,212 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2f6d686ab/f0b9d8f3c7c44acab00a51e7c6ddcf93/FLAG739c5a21d [2020-08-21 22:18:46,637 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2f6d686ab/f0b9d8f3c7c44acab00a51e7c6ddcf93 [2020-08-21 22:18:46,645 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:18:46,647 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:18:46,648 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:46,648 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:18:46,652 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:18:46,653 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:46,655 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ac3c2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46, skipping insertion in model container [2020-08-21 22:18:46,656 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:46,664 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:18:46,681 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:18:46,853 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:46,859 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:18:46,893 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:46,911 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:18:46,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46 WrapperNode [2020-08-21 22:18:46,914 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:46,915 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:18:46,915 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:18:46,915 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:18:46,930 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:46,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,049 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,056 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,064 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,065 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... [2020-08-21 22:18:47,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:18:47,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:18:47,073 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:18:47,073 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:18:47,074 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:47,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:18:47,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:18:47,133 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 22:18:47,133 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 22:18:47,133 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:18:47,133 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:18:47,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:18:47,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:18:47,326 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:18:47,326 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 22:18:47,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:47 BoogieIcfgContainer [2020-08-21 22:18:47,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:18:47,331 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:18:47,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:18:47,335 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:18:47,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:18:46" (1/3) ... [2020-08-21 22:18:47,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30f1bde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:47, skipping insertion in model container [2020-08-21 22:18:47,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:46" (2/3) ... [2020-08-21 22:18:47,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30f1bde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:47, skipping insertion in model container [2020-08-21 22:18:47,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:47" (3/3) ... [2020-08-21 22:18:47,339 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-21 22:18:47,350 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:18:47,358 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:18:47,373 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:18:47,395 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:18:47,396 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:18:47,396 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:18:47,396 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:18:47,396 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:18:47,396 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:18:47,396 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:18:47,397 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:18:47,414 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 22:18:47,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 22:18:47,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:47,420 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:47,421 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:47,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:47,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-21 22:18:47,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:47,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409799384] [2020-08-21 22:18:47,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:47,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:47,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:47,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409799384] [2020-08-21 22:18:47,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:47,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 22:18:47,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890595004] [2020-08-21 22:18:47,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 22:18:47,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:47,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 22:18:47,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 22:18:47,568 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-21 22:18:47,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:47,587 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-21 22:18:47,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 22:18:47,589 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 22:18:47,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:47,595 INFO L225 Difference]: With dead ends: 37 [2020-08-21 22:18:47,596 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 22:18:47,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 22:18:47,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 22:18:47,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 22:18:47,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 22:18:47,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-21 22:18:47,633 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-21 22:18:47,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:47,633 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-21 22:18:47,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 22:18:47,633 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-21 22:18:47,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 22:18:47,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:47,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:47,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:18:47,635 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:47,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:47,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-21 22:18:47,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:47,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155318161] [2020-08-21 22:18:47,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:47,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155318161] [2020-08-21 22:18:47,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:47,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:18:47,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42740051] [2020-08-21 22:18:47,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:18:47,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:47,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:18:47,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:47,687 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-21 22:18:47,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:47,706 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-21 22:18:47,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:18:47,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 22:18:47,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:47,708 INFO L225 Difference]: With dead ends: 20 [2020-08-21 22:18:47,708 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 22:18:47,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:47,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 22:18:47,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 22:18:47,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 22:18:47,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 22:18:47,715 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-21 22:18:47,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:47,716 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 22:18:47,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:18:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 22:18:47,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 22:18:47,717 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:47,717 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:47,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:18:47,718 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:47,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:47,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-21 22:18:47,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:47,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179734253] [2020-08-21 22:18:47,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:47,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:47,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:47,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179734253] [2020-08-21 22:18:47,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:47,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:18:47,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173787159] [2020-08-21 22:18:47,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:18:47,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:47,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:18:47,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:47,800 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 22:18:47,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:47,822 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-21 22:18:47,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:18:47,824 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-21 22:18:47,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:47,826 INFO L225 Difference]: With dead ends: 25 [2020-08-21 22:18:47,826 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 22:18:47,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:47,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 22:18:47,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 22:18:47,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 22:18:47,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 22:18:47,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-21 22:18:47,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:47,840 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 22:18:47,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:18:47,840 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 22:18:47,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 22:18:47,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:47,846 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:47,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:18:47,846 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:47,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:47,849 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-21 22:18:47,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:47,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988788974] [2020-08-21 22:18:47,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:47,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:47,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:47,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:47,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988788974] [2020-08-21 22:18:47,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:47,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:18:47,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878836151] [2020-08-21 22:18:47,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:18:47,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:47,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:18:47,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:47,927 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-21 22:18:47,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:47,991 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-21 22:18:47,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:18:47,992 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 22:18:47,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:47,993 INFO L225 Difference]: With dead ends: 26 [2020-08-21 22:18:47,993 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 22:18:47,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:47,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 22:18:47,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 22:18:47,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 22:18:48,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 22:18:48,000 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-21 22:18:48,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,001 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 22:18:48,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:18:48,001 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 22:18:48,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 22:18:48,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,006 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:18:48,006 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,007 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-21 22:18:48,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092447266] [2020-08-21 22:18:48,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,116 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:48,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092447266] [2020-08-21 22:18:48,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:18:48,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321865956] [2020-08-21 22:18:48,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:18:48,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:18:48,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:48,120 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-21 22:18:48,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,210 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 22:18:48,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:18:48,211 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 22:18:48,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,212 INFO L225 Difference]: With dead ends: 27 [2020-08-21 22:18:48,212 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 22:18:48,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:48,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 22:18:48,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 22:18:48,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 22:18:48,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 22:18:48,219 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-21 22:18:48,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,219 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 22:18:48,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:18:48,220 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 22:18:48,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:18:48,220 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,220 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:18:48,221 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,221 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-21 22:18:48,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331632572] [2020-08-21 22:18:48,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,288 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:48,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331632572] [2020-08-21 22:18:48,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:18:48,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861060415] [2020-08-21 22:18:48,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:18:48,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:18:48,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:48,291 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-21 22:18:48,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,395 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-21 22:18:48,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:18:48,396 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-21 22:18:48,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,397 INFO L225 Difference]: With dead ends: 28 [2020-08-21 22:18:48,397 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 22:18:48,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:48,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 22:18:48,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 22:18:48,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 22:18:48,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-21 22:18:48,404 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-21 22:18:48,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,404 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-21 22:18:48,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:18:48,405 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-21 22:18:48,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 22:18:48,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,406 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:18:48,406 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-21 22:18:48,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571904212] [2020-08-21 22:18:48,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,527 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:48,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571904212] [2020-08-21 22:18:48,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:18:48,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480109008] [2020-08-21 22:18:48,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:18:48,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:18:48,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:48,531 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-21 22:18:48,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,644 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 22:18:48,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 22:18:48,645 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-21 22:18:48,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,645 INFO L225 Difference]: With dead ends: 29 [2020-08-21 22:18:48,646 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 22:18:48,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:48,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 22:18:48,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 22:18:48,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 22:18:48,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 22:18:48,652 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-21 22:18:48,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,652 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 22:18:48,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:18:48,653 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 22:18:48,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 22:18:48,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,654 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:18:48,654 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-21 22:18:48,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177517038] [2020-08-21 22:18:48,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,743 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:48,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177517038] [2020-08-21 22:18:48,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:18:48,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371873369] [2020-08-21 22:18:48,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:18:48,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:18:48,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:48,748 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-21 22:18:48,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,908 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 22:18:48,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:18:48,909 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 22:18:48,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,910 INFO L225 Difference]: With dead ends: 30 [2020-08-21 22:18:48,910 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 22:18:48,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:48,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 22:18:48,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 22:18:48,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 22:18:48,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 22:18:48,916 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-21 22:18:48,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,916 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 22:18:48,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:18:48,917 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 22:18:48,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 22:18:48,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,918 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:18:48,918 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,918 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-21 22:18:48,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938991282] [2020-08-21 22:18:48,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,951 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:48,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938991282] [2020-08-21 22:18:48,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 22:18:48,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184332208] [2020-08-21 22:18:48,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:18:48,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:18:48,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:48,953 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-21 22:18:48,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,968 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 22:18:48,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 22:18:48,969 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 22:18:48,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,970 INFO L225 Difference]: With dead ends: 30 [2020-08-21 22:18:48,970 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 22:18:48,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:48,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 22:18:48,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 22:18:48,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 22:18:48,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-21 22:18:48,976 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-21 22:18:48,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,977 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-21 22:18:48,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:18:48,977 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-21 22:18:48,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 22:18:48,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,978 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:18:48,979 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,979 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-21 22:18:48,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833059086] [2020-08-21 22:18:48,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,046 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:49,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833059086] [2020-08-21 22:18:49,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:49,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:18:49,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711562624] [2020-08-21 22:18:49,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:18:49,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:49,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:18:49,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:49,049 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-21 22:18:49,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,074 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-21 22:18:49,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:18:49,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-21 22:18:49,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,075 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:18:49,076 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 22:18:49,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:49,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 22:18:49,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 22:18:49,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 22:18:49,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-21 22:18:49,083 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-21 22:18:49,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,083 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-21 22:18:49,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:18:49,083 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-21 22:18:49,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 22:18:49,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,085 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:18:49,085 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-21 22:18:49,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129713401] [2020-08-21 22:18:49,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,135 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:49,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129713401] [2020-08-21 22:18:49,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:49,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:18:49,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862500134] [2020-08-21 22:18:49,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:18:49,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:49,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:18:49,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:49,138 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-21 22:18:49,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,165 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 22:18:49,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:18:49,166 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-21 22:18:49,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,167 INFO L225 Difference]: With dead ends: 38 [2020-08-21 22:18:49,167 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 22:18:49,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:49,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 22:18:49,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 22:18:49,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 22:18:49,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-21 22:18:49,175 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-21 22:18:49,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,175 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-21 22:18:49,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:18:49,175 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-21 22:18:49,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 22:18:49,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,177 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:18:49,177 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,177 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-21 22:18:49,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859810124] [2020-08-21 22:18:49,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,281 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:49,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859810124] [2020-08-21 22:18:49,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:49,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 22:18:49,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447161575] [2020-08-21 22:18:49,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 22:18:49,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:49,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 22:18:49,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:18:49,284 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-21 22:18:49,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,469 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-21 22:18:49,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:18:49,470 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-21 22:18:49,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,471 INFO L225 Difference]: With dead ends: 54 [2020-08-21 22:18:49,471 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 22:18:49,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:49,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 22:18:49,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 22:18:49,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 22:18:49,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 22:18:49,480 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-21 22:18:49,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,480 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 22:18:49,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 22:18:49,481 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 22:18:49,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 22:18:49,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,482 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:18:49,482 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-21 22:18:49,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334448795] [2020-08-21 22:18:49,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,605 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:49,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334448795] [2020-08-21 22:18:49,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:49,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:18:49,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593546775] [2020-08-21 22:18:49,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:18:49,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:49,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:18:49,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:49,608 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-21 22:18:49,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,848 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-21 22:18:49,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:18:49,849 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-21 22:18:49,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,849 INFO L225 Difference]: With dead ends: 55 [2020-08-21 22:18:49,850 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 22:18:49,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:49,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 22:18:49,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 22:18:49,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 22:18:49,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-21 22:18:49,857 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-21 22:18:49,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,858 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-21 22:18:49,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:18:49,858 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-21 22:18:49,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 22:18:49,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,859 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:18:49,859 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,860 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-21 22:18:49,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [484360467] [2020-08-21 22:18:49,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:49,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:49,999 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:49,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [484360467] [2020-08-21 22:18:50,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 22:18:50,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952225310] [2020-08-21 22:18:50,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 22:18:50,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 22:18:50,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:50,001 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-21 22:18:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:50,249 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-21 22:18:50,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:18:50,250 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 22:18:50,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:50,251 INFO L225 Difference]: With dead ends: 56 [2020-08-21 22:18:50,251 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 22:18:50,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:50,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 22:18:50,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 22:18:50,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 22:18:50,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-21 22:18:50,265 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-21 22:18:50,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:50,266 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-21 22:18:50,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 22:18:50,266 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-21 22:18:50,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 22:18:50,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:50,267 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:50,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 22:18:50,269 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:50,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:50,269 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-21 22:18:50,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:50,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117184096] [2020-08-21 22:18:50,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:50,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:50,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,427 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:50,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117184096] [2020-08-21 22:18:50,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:18:50,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339198023] [2020-08-21 22:18:50,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:18:50,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:18:50,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:50,430 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-21 22:18:50,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:50,727 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-21 22:18:50,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:18:50,728 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 22:18:50,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:50,729 INFO L225 Difference]: With dead ends: 57 [2020-08-21 22:18:50,729 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 22:18:50,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:50,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 22:18:50,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 22:18:50,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 22:18:50,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-21 22:18:50,748 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-21 22:18:50,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:50,748 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-21 22:18:50,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:18:50,748 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-21 22:18:50,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 22:18:50,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:50,749 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:50,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 22:18:50,750 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:50,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:50,750 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-21 22:18:50,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:50,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246645305] [2020-08-21 22:18:50,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:50,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:50,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,904 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:50,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246645305] [2020-08-21 22:18:50,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 22:18:50,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849057281] [2020-08-21 22:18:50,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 22:18:50,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 22:18:50,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:50,906 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-21 22:18:51,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:51,309 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-21 22:18:51,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 22:18:51,310 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 22:18:51,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:51,311 INFO L225 Difference]: With dead ends: 58 [2020-08-21 22:18:51,311 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 22:18:51,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:51,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 22:18:51,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 22:18:51,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 22:18:51,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-21 22:18:51,319 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-21 22:18:51,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:51,319 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-21 22:18:51,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 22:18:51,319 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-21 22:18:51,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 22:18:51,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:51,320 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:51,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 22:18:51,321 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:51,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:51,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-21 22:18:51,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:51,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19313825] [2020-08-21 22:18:51,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:51,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:51,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:51,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:51,474 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:51,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19313825] [2020-08-21 22:18:51,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:51,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:18:51,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360581822] [2020-08-21 22:18:51,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:18:51,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:51,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:18:51,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:51,477 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-21 22:18:51,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:51,852 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-21 22:18:51,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 22:18:51,852 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 22:18:51,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:51,853 INFO L225 Difference]: With dead ends: 59 [2020-08-21 22:18:51,853 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 22:18:51,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:51,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 22:18:51,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 22:18:51,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:18:51,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-21 22:18:51,860 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-21 22:18:51,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:51,861 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-21 22:18:51,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:18:51,861 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-21 22:18:51,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 22:18:51,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:51,862 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:51,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 22:18:51,862 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:51,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:51,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-21 22:18:51,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:51,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521085802] [2020-08-21 22:18:51,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:51,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:52,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,066 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:52,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521085802] [2020-08-21 22:18:52,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:52,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 22:18:52,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793242599] [2020-08-21 22:18:52,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 22:18:52,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:52,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 22:18:52,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:52,069 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-21 22:18:52,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:52,547 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-21 22:18:52,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 22:18:52,548 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 22:18:52,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:52,549 INFO L225 Difference]: With dead ends: 60 [2020-08-21 22:18:52,549 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 22:18:52,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:52,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 22:18:52,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 22:18:52,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 22:18:52,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-21 22:18:52,557 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-21 22:18:52,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:52,557 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-21 22:18:52,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 22:18:52,558 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-21 22:18:52,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 22:18:52,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:52,558 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:52,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 22:18:52,559 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:52,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:52,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-21 22:18:52,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:52,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451793655] [2020-08-21 22:18:52,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:52,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:52,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,760 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:52,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451793655] [2020-08-21 22:18:52,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:52,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:18:52,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226391944] [2020-08-21 22:18:52,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:18:52,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:52,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:18:52,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:52,770 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-21 22:18:53,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:53,303 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-21 22:18:53,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:18:53,304 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-21 22:18:53,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:53,305 INFO L225 Difference]: With dead ends: 61 [2020-08-21 22:18:53,305 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 22:18:53,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:53,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 22:18:53,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 22:18:53,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 22:18:53,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-21 22:18:53,315 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-21 22:18:53,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:53,315 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-21 22:18:53,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:18:53,315 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-21 22:18:53,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 22:18:53,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:53,316 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:53,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 22:18:53,317 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:53,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:53,317 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-21 22:18:53,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:53,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881720684] [2020-08-21 22:18:53,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:53,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:53,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:53,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:53,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881720684] [2020-08-21 22:18:53,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:53,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 22:18:53,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267550815] [2020-08-21 22:18:53,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 22:18:53,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:53,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 22:18:53,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:53,515 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-21 22:18:54,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:54,099 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-21 22:18:54,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 22:18:54,099 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 22:18:54,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:54,100 INFO L225 Difference]: With dead ends: 62 [2020-08-21 22:18:54,100 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 22:18:54,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:54,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 22:18:54,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 22:18:54,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 22:18:54,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-21 22:18:54,107 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-21 22:18:54,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:54,108 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-21 22:18:54,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 22:18:54,108 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-21 22:18:54,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 22:18:54,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:54,109 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:54,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 22:18:54,109 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:54,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:54,109 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-21 22:18:54,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:54,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774321621] [2020-08-21 22:18:54,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:54,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:54,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,317 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:54,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774321621] [2020-08-21 22:18:54,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:54,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 22:18:54,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215690144] [2020-08-21 22:18:54,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 22:18:54,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:54,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 22:18:54,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:54,319 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-21 22:18:54,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:54,966 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 22:18:54,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 22:18:54,968 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-21 22:18:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:54,969 INFO L225 Difference]: With dead ends: 63 [2020-08-21 22:18:54,969 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 22:18:54,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:54,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 22:18:54,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 22:18:54,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 22:18:54,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-21 22:18:54,976 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-21 22:18:54,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:54,976 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-21 22:18:54,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 22:18:54,976 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-21 22:18:54,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 22:18:54,977 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:54,977 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:54,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 22:18:54,977 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:54,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:54,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-21 22:18:54,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:54,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369763149] [2020-08-21 22:18:54,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:54,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:55,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:55,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:55,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369763149] [2020-08-21 22:18:55,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:55,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 22:18:55,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328466205] [2020-08-21 22:18:55,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 22:18:55,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:55,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 22:18:55,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:55,270 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-21 22:18:56,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:56,009 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-21 22:18:56,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 22:18:56,014 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-21 22:18:56,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:56,014 INFO L225 Difference]: With dead ends: 64 [2020-08-21 22:18:56,014 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 22:18:56,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:56,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 22:18:56,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 22:18:56,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 22:18:56,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-21 22:18:56,022 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-21 22:18:56,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:56,022 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-21 22:18:56,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 22:18:56,022 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-21 22:18:56,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 22:18:56,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:56,023 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:56,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 22:18:56,023 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:56,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:56,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-21 22:18:56,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:56,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754645268] [2020-08-21 22:18:56,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:56,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:56,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:56,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:56,312 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:56,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754645268] [2020-08-21 22:18:56,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:56,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:18:56,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872552731] [2020-08-21 22:18:56,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:18:56,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:56,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:18:56,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:56,315 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-21 22:18:57,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:57,155 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-21 22:18:57,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:18:57,156 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-21 22:18:57,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:57,157 INFO L225 Difference]: With dead ends: 65 [2020-08-21 22:18:57,157 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 22:18:57,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:57,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 22:18:57,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 22:18:57,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 22:18:57,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-21 22:18:57,165 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-21 22:18:57,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:57,166 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-21 22:18:57,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:18:57,166 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-21 22:18:57,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 22:18:57,166 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:57,167 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:57,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 22:18:57,167 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:57,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:57,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-21 22:18:57,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:57,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351410831] [2020-08-21 22:18:57,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:57,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:57,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:57,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:57,473 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:57,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351410831] [2020-08-21 22:18:57,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:57,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 22:18:57,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993903045] [2020-08-21 22:18:57,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 22:18:57,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:57,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 22:18:57,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:57,476 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-21 22:18:58,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:58,375 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 22:18:58,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 22:18:58,375 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-21 22:18:58,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:58,376 INFO L225 Difference]: With dead ends: 66 [2020-08-21 22:18:58,376 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 22:18:58,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:58,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 22:18:58,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 22:18:58,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 22:18:58,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-21 22:18:58,382 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-21 22:18:58,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:58,382 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-21 22:18:58,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 22:18:58,382 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-21 22:18:58,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 22:18:58,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:58,383 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:58,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 22:18:58,383 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:58,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:58,384 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-21 22:18:58,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:58,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828072512] [2020-08-21 22:18:58,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:58,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:58,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:58,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:58,734 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:18:58,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828072512] [2020-08-21 22:18:58,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:58,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 22:18:58,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251206912] [2020-08-21 22:18:58,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 22:18:58,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:58,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 22:18:58,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:58,735 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-21 22:18:59,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:59,755 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-21 22:18:59,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 22:18:59,756 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-21 22:18:59,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:59,756 INFO L225 Difference]: With dead ends: 67 [2020-08-21 22:18:59,757 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 22:18:59,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:59,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 22:18:59,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 22:18:59,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 22:18:59,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-21 22:18:59,765 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-21 22:18:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:59,765 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-21 22:18:59,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 22:18:59,766 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-21 22:18:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 22:18:59,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:59,766 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:59,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 22:18:59,767 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:59,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:59,767 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-21 22:18:59,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:59,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498668380] [2020-08-21 22:18:59,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:59,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:00,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,124 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:19:00,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498668380] [2020-08-21 22:19:00,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:00,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 22:19:00,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844943352] [2020-08-21 22:19:00,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 22:19:00,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:00,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 22:19:00,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:19:00,126 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-21 22:19:01,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:01,218 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-21 22:19:01,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 22:19:01,219 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-21 22:19:01,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:01,220 INFO L225 Difference]: With dead ends: 68 [2020-08-21 22:19:01,220 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:19:01,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 22:19:01,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:19:01,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 22:19:01,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 22:19:01,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-21 22:19:01,229 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-21 22:19:01,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:01,229 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-21 22:19:01,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 22:19:01,229 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-21 22:19:01,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 22:19:01,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:01,230 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:01,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 22:19:01,231 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:01,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:01,231 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-21 22:19:01,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:01,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687663780] [2020-08-21 22:19:01,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:01,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:01,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:01,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:01,672 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 22:19:01,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687663780] [2020-08-21 22:19:01,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:01,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 22:19:01,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233407649] [2020-08-21 22:19:01,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 22:19:01,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:01,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 22:19:01,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:19:01,674 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-21 22:19:02,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:02,906 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-21 22:19:02,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 22:19:02,916 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-21 22:19:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:02,917 INFO L225 Difference]: With dead ends: 69 [2020-08-21 22:19:02,917 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 22:19:02,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 22:19:02,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 22:19:02,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 22:19:02,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 22:19:02,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-21 22:19:02,925 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-21 22:19:02,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:02,926 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-21 22:19:02,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 22:19:02,926 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-21 22:19:02,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 22:19:02,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:02,926 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:02,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 22:19:02,927 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:02,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:02,927 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-21 22:19:02,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:02,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029489485] [2020-08-21 22:19:02,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:02,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:02,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:02,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:02,983 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-21 22:19:02,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029489485] [2020-08-21 22:19:02,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:19:02,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 22:19:02,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005239100] [2020-08-21 22:19:02,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:19:02,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:02,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:19:02,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:19:02,985 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-21 22:19:03,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:03,012 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 22:19:03,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:19:03,012 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 22:19:03,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:03,013 INFO L225 Difference]: With dead ends: 66 [2020-08-21 22:19:03,013 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 22:19:03,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:19:03,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 22:19:03,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 22:19:03,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 22:19:03,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 22:19:03,014 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-21 22:19:03,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:03,014 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 22:19:03,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:19:03,014 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 22:19:03,015 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 22:19:03,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 22:19:03,017 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 22:19:03,215 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-21 22:19:03,219 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 22:19:03,220 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-21 22:19:03,220 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-21 22:19:03,221 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-21 22:19:03,221 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-21 22:19:03,221 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-21 22:19:03,221 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 22:19:03,221 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 22:19:03,221 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-21 22:19:03,222 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-21 22:19:03,222 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-21 22:19:03,222 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 22:19:03,222 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-21 22:19:03,222 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-21 22:19:03,223 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-21 22:19:03,223 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-21 22:19:03,223 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-21 22:19:03,223 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-21 22:19:03,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 10:19:03 BoogieIcfgContainer [2020-08-21 22:19:03,238 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 22:19:03,240 INFO L168 Benchmark]: Toolchain (without parser) took 16593.42 ms. Allocated memory was 138.4 MB in the beginning and 353.9 MB in the end (delta: 215.5 MB). Free memory was 101.4 MB in the beginning and 261.1 MB in the end (delta: -159.7 MB). Peak memory consumption was 55.8 MB. Max. memory is 7.1 GB. [2020-08-21 22:19:03,241 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 22:19:03,242 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.37 ms. Allocated memory is still 138.4 MB. Free memory was 101.2 MB in the beginning and 91.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-21 22:19:03,242 INFO L168 Benchmark]: Boogie Preprocessor took 157.49 ms. Allocated memory was 138.4 MB in the beginning and 203.4 MB in the end (delta: 65.0 MB). Free memory was 91.7 MB in the beginning and 182.1 MB in the end (delta: -90.4 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 22:19:03,243 INFO L168 Benchmark]: RCFGBuilder took 257.86 ms. Allocated memory is still 203.4 MB. Free memory was 181.4 MB in the beginning and 169.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-21 22:19:03,244 INFO L168 Benchmark]: TraceAbstraction took 15907.14 ms. Allocated memory was 203.4 MB in the beginning and 353.9 MB in the end (delta: 150.5 MB). Free memory was 169.2 MB in the beginning and 261.1 MB in the end (delta: -91.9 MB). Peak memory consumption was 58.5 MB. Max. memory is 7.1 GB. [2020-08-21 22:19:03,247 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 266.37 ms. Allocated memory is still 138.4 MB. Free memory was 101.2 MB in the beginning and 91.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 157.49 ms. Allocated memory was 138.4 MB in the beginning and 203.4 MB in the end (delta: 65.0 MB). Free memory was 91.7 MB in the beginning and 182.1 MB in the end (delta: -90.4 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 257.86 ms. Allocated memory is still 203.4 MB. Free memory was 181.4 MB in the beginning and 169.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15907.14 ms. Allocated memory was 203.4 MB in the beginning and 353.9 MB in the end (delta: 150.5 MB). Free memory was 169.2 MB in the beginning and 261.1 MB in the end (delta: -91.9 MB). Peak memory consumption was 58.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.6s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...