/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:26:10,288 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:26:10,291 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:26:10,328 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:26:10,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:26:10,337 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:26:10,338 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:26:10,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:26:10,344 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:26:10,347 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:26:10,347 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:26:10,349 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:26:10,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:26:10,352 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:26:10,355 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:26:10,357 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:26:10,358 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:26:10,359 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:26:10,361 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:26:10,369 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:26:10,371 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:26:10,372 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:26:10,373 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:26:10,374 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:26:10,386 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 20:26:10,386 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 20:26:10,386 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 20:26:10,388 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 20:26:10,389 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 20:26:10,391 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 20:26:10,391 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:26:10,392 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:26:10,393 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:26:10,393 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:26:10,395 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:26:10,395 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:26:10,396 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:26:10,396 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:26:10,396 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:26:10,397 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:26:10,398 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:26:10,399 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:26:10,440 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:26:10,440 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:26:10,442 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:26:10,442 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:26:10,442 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:26:10,443 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:26:10,443 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:26:10,443 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:26:10,443 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:26:10,444 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:26:10,445 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:26:10,445 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:26:10,445 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:26:10,446 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:26:10,446 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:26:10,446 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:26:10,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:26:10,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:26:10,447 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:26:10,447 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:26:10,447 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:26:10,447 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:26:10,447 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:26:10,448 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:26:10,449 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:26:10,803 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:26:10,818 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:26:10,826 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:26:10,827 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:26:10,828 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:26:10,829 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 20:26:10,894 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/57bb70170/a7c6f06a66ce4e9f9c7a6e03b8f72bda/FLAG479d5f18f [2020-08-18 20:26:11,305 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:26:11,306 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 20:26:11,313 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/57bb70170/a7c6f06a66ce4e9f9c7a6e03b8f72bda/FLAG479d5f18f [2020-08-18 20:26:11,666 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/57bb70170/a7c6f06a66ce4e9f9c7a6e03b8f72bda [2020-08-18 20:26:11,677 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:26:11,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:26:11,680 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:26:11,680 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:26:11,685 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:26:11,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:11,689 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6faa959a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11, skipping insertion in model container [2020-08-18 20:26:11,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:11,699 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:26:11,720 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:26:11,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:26:11,894 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:26:11,908 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:26:11,921 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:26:11,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11 WrapperNode [2020-08-18 20:26:11,922 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:26:11,923 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:26:11,923 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:26:11,923 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:26:11,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:11,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,022 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,023 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,027 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,034 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,035 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... [2020-08-18 20:26:12,042 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:26:12,043 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:26:12,043 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:26:12,043 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:26:12,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:26:12,100 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:26:12,100 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:26:12,100 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 20:26:12,100 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:26:12,100 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:26:12,100 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:26:12,101 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:26:12,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:26:12,287 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:26:12,287 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 20:26:12,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:26:12 BoogieIcfgContainer [2020-08-18 20:26:12,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:26:12,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:26:12,293 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:26:12,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:26:12,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:26:11" (1/3) ... [2020-08-18 20:26:12,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3742445b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:26:12, skipping insertion in model container [2020-08-18 20:26:12,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:26:11" (2/3) ... [2020-08-18 20:26:12,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3742445b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:26:12, skipping insertion in model container [2020-08-18 20:26:12,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:26:12" (3/3) ... [2020-08-18 20:26:12,301 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-18 20:26:12,314 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:26:12,322 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:26:12,337 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:26:12,363 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:26:12,363 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:26:12,363 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:26:12,363 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:26:12,363 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:26:12,364 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:26:12,364 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:26:12,364 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:26:12,382 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 20:26:12,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 20:26:12,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,390 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,390 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-18 20:26:12,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708663449] [2020-08-18 20:26:12,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708663449] [2020-08-18 20:26:12,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:12,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 20:26:12,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502618307] [2020-08-18 20:26:12,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 20:26:12,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 20:26:12,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 20:26:12,549 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-18 20:26:12,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,575 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-18 20:26:12,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 20:26:12,577 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 20:26:12,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,585 INFO L225 Difference]: With dead ends: 37 [2020-08-18 20:26:12,586 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 20:26:12,590 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 [2020-08-18 20:26:12,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 20:26:12,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 20:26:12,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 20:26:12,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-18 20:26:12,632 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-18 20:26:12,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,633 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-18 20:26:12,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 20:26:12,633 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-18 20:26:12,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 20:26:12,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:26:12,635 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-18 20:26:12,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591945939] [2020-08-18 20:26:12,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591945939] [2020-08-18 20:26:12,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:12,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:26:12,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501368646] [2020-08-18 20:26:12,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:26:12,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:26:12,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:12,696 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-18 20:26:12,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,713 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-18 20:26:12,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:26:12,714 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 20:26:12,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,715 INFO L225 Difference]: With dead ends: 20 [2020-08-18 20:26:12,715 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 20:26:12,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:12,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 20:26:12,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 20:26:12,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:26:12,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 20:26:12,725 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-18 20:26:12,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,726 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 20:26:12,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:26:12,726 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 20:26:12,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 20:26:12,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:26:12,728 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-18 20:26:12,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070137397] [2020-08-18 20:26:12,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070137397] [2020-08-18 20:26:12,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:12,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:26:12,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732389048] [2020-08-18 20:26:12,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:26:12,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:26:12,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:12,771 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 20:26:12,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,788 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-18 20:26:12,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:26:12,790 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-18 20:26:12,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,792 INFO L225 Difference]: With dead ends: 25 [2020-08-18 20:26:12,792 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 20:26:12,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:26:12,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 20:26:12,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 20:26:12,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 20:26:12,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 20:26:12,802 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-18 20:26:12,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,802 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 20:26:12,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:26:12,803 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 20:26:12,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 20:26:12,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,804 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:26:12,805 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,806 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-18 20:26:12,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611917510] [2020-08-18 20:26:12,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,880 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611917510] [2020-08-18 20:26:12,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:12,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:26:12,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224279341] [2020-08-18 20:26:12,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:26:12,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:26:12,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:26:12,884 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-18 20:26:12,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,957 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-18 20:26:12,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:26:12,958 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-18 20:26:12,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,960 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:26:12,960 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 20:26:12,961 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 [2020-08-18 20:26:12,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 20:26:12,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 20:26:12,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:26:12,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 20:26:12,969 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-18 20:26:12,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,969 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 20:26:12,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:26:12,970 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 20:26:12,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:26:12,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,971 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:26:12,971 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,972 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-18 20:26:12,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069914781] [2020-08-18 20:26:12,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,135 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:13,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069914781] [2020-08-18 20:26:13,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:26:13,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131553413] [2020-08-18 20:26:13,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:26:13,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:26:13,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:26:13,143 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-18 20:26:13,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:13,229 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 20:26:13,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:26:13,230 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 20:26:13,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:13,231 INFO L225 Difference]: With dead ends: 27 [2020-08-18 20:26:13,231 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 20:26:13,232 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 [2020-08-18 20:26:13,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 20:26:13,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 20:26:13,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 20:26:13,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 20:26:13,238 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-18 20:26:13,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:13,239 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 20:26:13,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:26:13,239 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 20:26:13,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:26:13,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:13,240 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:13,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:26:13,240 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:13,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:13,241 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-18 20:26:13,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:13,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442702475] [2020-08-18 20:26:13,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:13,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,313 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:13,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442702475] [2020-08-18 20:26:13,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:26:13,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820553402] [2020-08-18 20:26:13,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:26:13,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:26:13,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:26:13,316 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-18 20:26:13,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:13,428 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-18 20:26:13,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:26:13,429 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-18 20:26:13,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:13,430 INFO L225 Difference]: With dead ends: 28 [2020-08-18 20:26:13,440 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 20:26:13,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:26:13,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 20:26:13,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 20:26:13,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 20:26:13,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-18 20:26:13,447 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-18 20:26:13,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:13,447 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-18 20:26:13,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:26:13,448 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-18 20:26:13,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 20:26:13,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:13,449 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:13,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:26:13,453 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:13,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:13,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-18 20:26:13,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:13,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158316755] [2020-08-18 20:26:13,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:13,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,570 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:13,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158316755] [2020-08-18 20:26:13,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:26:13,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944389967] [2020-08-18 20:26:13,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:26:13,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:26:13,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:26:13,573 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-18 20:26:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:13,713 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 20:26:13,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:26:13,714 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-18 20:26:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:13,715 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:26:13,715 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:26:13,716 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 [2020-08-18 20:26:13,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:26:13,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 20:26:13,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 20:26:13,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 20:26:13,722 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-18 20:26:13,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:13,722 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 20:26:13,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:26:13,723 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 20:26:13,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:26:13,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:13,724 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:13,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:26:13,724 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:13,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:13,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-18 20:26:13,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:13,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980748520] [2020-08-18 20:26:13,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:13,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,836 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:13,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980748520] [2020-08-18 20:26:13,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:26:13,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085602555] [2020-08-18 20:26:13,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:26:13,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:26:13,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:26:13,839 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-18 20:26:14,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,003 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 20:26:14,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:26:14,003 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 20:26:14,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,004 INFO L225 Difference]: With dead ends: 30 [2020-08-18 20:26:14,004 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 20:26:14,005 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 [2020-08-18 20:26:14,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 20:26:14,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 20:26:14,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 20:26:14,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-18 20:26:14,011 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-18 20:26:14,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,012 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-18 20:26:14,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:26:14,012 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-18 20:26:14,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:26:14,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,013 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:26:14,014 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,014 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-18 20:26:14,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862373338] [2020-08-18 20:26:14,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,055 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:14,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862373338] [2020-08-18 20:26:14,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 20:26:14,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738181320] [2020-08-18 20:26:14,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:26:14,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:26:14,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:26:14,060 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-18 20:26:14,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,083 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-18 20:26:14,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:26:14,084 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 20:26:14,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,085 INFO L225 Difference]: With dead ends: 30 [2020-08-18 20:26:14,085 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 20:26:14,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:26:14,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 20:26:14,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 20:26:14,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:26:14,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-18 20:26:14,097 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-18 20:26:14,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,097 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-18 20:26:14,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:26:14,101 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-18 20:26:14,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:26:14,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,102 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:26:14,104 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,104 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-18 20:26:14,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226295314] [2020-08-18 20:26:14,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:14,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226295314] [2020-08-18 20:26:14,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:26:14,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776305706] [2020-08-18 20:26:14,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:26:14,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:26:14,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:26:14,184 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-18 20:26:14,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,212 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-18 20:26:14,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:26:14,213 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-18 20:26:14,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,214 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:26:14,214 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 20:26:14,214 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 [2020-08-18 20:26:14,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 20:26:14,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 20:26:14,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:26:14,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-18 20:26:14,221 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-18 20:26:14,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,221 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-18 20:26:14,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:26:14,222 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-18 20:26:14,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:26:14,223 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,223 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:26:14,223 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,224 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-18 20:26:14,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106537534] [2020-08-18 20:26:14,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,282 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:14,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106537534] [2020-08-18 20:26:14,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:26:14,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888019700] [2020-08-18 20:26:14,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:26:14,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:26:14,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:26:14,285 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-18 20:26:14,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,312 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-18 20:26:14,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:26:14,313 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-18 20:26:14,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,314 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:26:14,314 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 20:26:14,315 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 [2020-08-18 20:26:14,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 20:26:14,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 20:26:14,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:26:14,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-18 20:26:14,323 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-18 20:26:14,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,323 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-18 20:26:14,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:26:14,324 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-18 20:26:14,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:26:14,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,325 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:26:14,326 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,326 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-18 20:26:14,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373057247] [2020-08-18 20:26:14,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,433 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:14,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373057247] [2020-08-18 20:26:14,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:26:14,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039659340] [2020-08-18 20:26:14,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:26:14,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:26:14,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:26:14,437 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-18 20:26:14,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,652 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-18 20:26:14,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:26:14,653 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-18 20:26:14,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,653 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:26:14,654 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:26:14,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:26:14,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:26:14,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 20:26:14,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 20:26:14,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 20:26:14,661 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-18 20:26:14,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:14,662 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 20:26:14,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:26:14,662 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 20:26:14,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:26:14,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:14,663 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:14,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:26:14,663 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:14,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:14,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-18 20:26:14,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:14,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723120515] [2020-08-18 20:26:14,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:14,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,772 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:14,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723120515] [2020-08-18 20:26:14,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:26:14,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72458334] [2020-08-18 20:26:14,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:26:14,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:26:14,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:26:14,774 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-18 20:26:14,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:14,996 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-18 20:26:14,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:26:14,997 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-18 20:26:14,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:14,998 INFO L225 Difference]: With dead ends: 55 [2020-08-18 20:26:14,998 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 20:26:14,999 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 [2020-08-18 20:26:14,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 20:26:15,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 20:26:15,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:26:15,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-18 20:26:15,005 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-18 20:26:15,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,005 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-18 20:26:15,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:26:15,006 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-18 20:26:15,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:26:15,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,006 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:26:15,007 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,007 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-18 20:26:15,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467527309] [2020-08-18 20:26:15,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,126 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:15,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467527309] [2020-08-18 20:26:15,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:15,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:26:15,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776971824] [2020-08-18 20:26:15,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:26:15,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:26:15,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:26:15,128 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-18 20:26:15,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,425 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-18 20:26:15,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:26:15,426 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 20:26:15,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,426 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:26:15,427 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:26:15,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:26:15,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:26:15,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 20:26:15,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 20:26:15,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-18 20:26:15,440 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-18 20:26:15,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,443 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-18 20:26:15,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:26:15,444 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-18 20:26:15,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 20:26:15,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,445 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:26:15,445 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,445 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-18 20:26:15,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611074022] [2020-08-18 20:26:15,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,616 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:15,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611074022] [2020-08-18 20:26:15,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:15,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:26:15,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426013810] [2020-08-18 20:26:15,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:26:15,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:26:15,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:26:15,618 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-18 20:26:15,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,964 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-18 20:26:15,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:26:15,965 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 20:26:15,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,965 INFO L225 Difference]: With dead ends: 57 [2020-08-18 20:26:15,966 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 20:26:15,966 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 [2020-08-18 20:26:15,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 20:26:15,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 20:26:15,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:26:15,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-18 20:26:15,973 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-18 20:26:15,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,973 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-18 20:26:15,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:26:15,973 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-18 20:26:15,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:26:15,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,974 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:26:15,974 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,975 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-18 20:26:15,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953111306] [2020-08-18 20:26:15,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,117 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:16,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953111306] [2020-08-18 20:26:16,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:26:16,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723440674] [2020-08-18 20:26:16,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:26:16,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:26:16,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:26:16,119 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-18 20:26:16,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:16,526 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-18 20:26:16,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:26:16,528 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 20:26:16,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:16,529 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:26:16,529 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:26:16,531 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 [2020-08-18 20:26:16,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:26:16,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 20:26:16,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 20:26:16,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-18 20:26:16,544 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-18 20:26:16,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:16,544 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-18 20:26:16,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:26:16,544 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-18 20:26:16,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:26:16,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:16,547 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:16,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:26:16,548 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:16,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:16,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-18 20:26:16,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:16,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239711863] [2020-08-18 20:26:16,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:16,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,739 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:16,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239711863] [2020-08-18 20:26:16,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:26:16,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643893284] [2020-08-18 20:26:16,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:26:16,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:26:16,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:26:16,741 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-18 20:26:17,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:17,196 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-18 20:26:17,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:26:17,199 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 20:26:17,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:17,201 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:26:17,201 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 20:26:17,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:26:17,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 20:26:17,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 20:26:17,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:26:17,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-18 20:26:17,210 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-18 20:26:17,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:17,211 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-18 20:26:17,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:26:17,211 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-18 20:26:17,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:26:17,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:17,212 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:17,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:26:17,213 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:17,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-18 20:26:17,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:17,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770541991] [2020-08-18 20:26:17,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:17,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:17,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:17,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:17,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770541991] [2020-08-18 20:26:17,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:17,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:26:17,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347847246] [2020-08-18 20:26:17,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:26:17,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:17,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:26:17,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:26:17,451 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-18 20:26:18,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:18,033 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-18 20:26:18,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:26:18,034 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 20:26:18,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:18,035 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:26:18,035 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:26:18,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:26:18,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:26:18,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 20:26:18,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 20:26:18,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-18 20:26:18,044 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-18 20:26:18,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:18,044 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-18 20:26:18,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:26:18,044 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-18 20:26:18,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:26:18,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:18,045 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:18,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:26:18,046 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:18,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:18,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-18 20:26:18,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:18,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102250009] [2020-08-18 20:26:18,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:18,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:18,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:18,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:18,282 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:18,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102250009] [2020-08-18 20:26:18,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:18,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:26:18,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477108559] [2020-08-18 20:26:18,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:26:18,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:18,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:26:18,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:26:18,284 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-18 20:26:18,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:18,849 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-18 20:26:18,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:26:18,849 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-18 20:26:18,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:18,851 INFO L225 Difference]: With dead ends: 61 [2020-08-18 20:26:18,851 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:26:18,852 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 [2020-08-18 20:26:18,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:26:18,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 20:26:18,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:26:18,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-18 20:26:18,873 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-18 20:26:18,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:18,874 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-18 20:26:18,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:26:18,874 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-18 20:26:18,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:26:18,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:18,875 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:18,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:26:18,881 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:18,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:18,881 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-18 20:26:18,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:18,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478127873] [2020-08-18 20:26:18,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:18,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:19,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:19,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:19,125 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:19,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478127873] [2020-08-18 20:26:19,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:19,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:26:19,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218389549] [2020-08-18 20:26:19,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:26:19,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:19,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:26:19,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:26:19,127 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-18 20:26:19,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:19,754 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-18 20:26:19,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:26:19,756 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 20:26:19,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:19,756 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:26:19,756 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:26:19,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:26:19,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:26:19,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 20:26:19,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 20:26:19,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-18 20:26:19,764 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-18 20:26:19,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:19,764 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-18 20:26:19,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:26:19,765 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-18 20:26:19,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:26:19,765 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:19,765 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:19,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:26:19,766 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:19,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:19,766 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-18 20:26:19,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:19,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616270798] [2020-08-18 20:26:19,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:19,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:20,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,025 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:20,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616270798] [2020-08-18 20:26:20,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:20,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:26:20,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125398477] [2020-08-18 20:26:20,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:26:20,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:20,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:26:20,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:26:20,028 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-18 20:26:20,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:20,768 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 20:26:20,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:26:20,769 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-18 20:26:20,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:20,770 INFO L225 Difference]: With dead ends: 63 [2020-08-18 20:26:20,770 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 20:26:20,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:26:20,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 20:26:20,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 20:26:20,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:26:20,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-18 20:26:20,777 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-18 20:26:20,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:20,778 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-18 20:26:20,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:26:20,778 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-18 20:26:20,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 20:26:20,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:20,779 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:20,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:26:20,779 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:20,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:20,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-18 20:26:20,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:20,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951388122] [2020-08-18 20:26:20,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:20,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:21,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:21,089 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:21,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951388122] [2020-08-18 20:26:21,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:21,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:26:21,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541482263] [2020-08-18 20:26:21,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:26:21,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:21,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:26:21,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:26:21,093 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-18 20:26:21,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:21,901 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-18 20:26:21,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:26:21,903 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-18 20:26:21,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:21,904 INFO L225 Difference]: With dead ends: 64 [2020-08-18 20:26:21,904 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:26:21,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:26:21,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:26:21,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 20:26:21,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 20:26:21,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-18 20:26:21,914 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-18 20:26:21,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:21,914 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-18 20:26:21,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:26:21,914 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-18 20:26:21,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 20:26:21,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:21,915 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:21,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:26:21,916 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:21,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:21,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-18 20:26:21,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:21,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725208883] [2020-08-18 20:26:21,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:21,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:22,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,248 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:22,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725208883] [2020-08-18 20:26:22,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:22,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:26:22,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921480009] [2020-08-18 20:26:22,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:26:22,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:22,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:26:22,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:26:22,250 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-18 20:26:23,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:23,120 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-18 20:26:23,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:26:23,120 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-18 20:26:23,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:23,121 INFO L225 Difference]: With dead ends: 65 [2020-08-18 20:26:23,122 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 20:26:23,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:26:23,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 20:26:23,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 20:26:23,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:26:23,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-18 20:26:23,131 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-18 20:26:23,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:23,131 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-18 20:26:23,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:26:23,132 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-18 20:26:23,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:26:23,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:23,132 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:23,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:26:23,133 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:23,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:23,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-18 20:26:23,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:23,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170064610] [2020-08-18 20:26:23,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:23,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:23,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:23,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:23,515 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:23,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170064610] [2020-08-18 20:26:23,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:23,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:26:23,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91755750] [2020-08-18 20:26:23,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:26:23,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:23,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:26:23,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:26:23,518 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-18 20:26:24,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:24,525 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 20:26:24,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:26:24,527 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-18 20:26:24,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:24,528 INFO L225 Difference]: With dead ends: 66 [2020-08-18 20:26:24,528 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:26:24,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:26:24,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:26:24,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 20:26:24,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:26:24,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-18 20:26:24,539 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-18 20:26:24,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:24,539 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-18 20:26:24,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:26:24,539 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-18 20:26:24,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 20:26:24,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:24,540 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:24,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:26:24,540 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:24,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:24,541 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-18 20:26:24,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:24,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911832549] [2020-08-18 20:26:24,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:24,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:24,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,919 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:24,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911832549] [2020-08-18 20:26:24,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:24,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:26:24,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798147925] [2020-08-18 20:26:24,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:26:24,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:24,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:26:24,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:26:24,920 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-18 20:26:26,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:26,027 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-18 20:26:26,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:26:26,028 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-18 20:26:26,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:26,029 INFO L225 Difference]: With dead ends: 67 [2020-08-18 20:26:26,029 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 20:26:26,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:26,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 20:26:26,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 20:26:26,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:26:26,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-18 20:26:26,037 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-18 20:26:26,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:26,038 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-18 20:26:26,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:26:26,038 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-18 20:26:26,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:26:26,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:26,039 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:26,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:26:26,039 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:26,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:26,039 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-18 20:26:26,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:26,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438754040] [2020-08-18 20:26:26,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:26,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:26,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,451 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:26,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438754040] [2020-08-18 20:26:26,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:26,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:26:26,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142375112] [2020-08-18 20:26:26,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:26:26,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:26,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:26:26,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:26:26,453 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-18 20:26:27,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:27,691 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-18 20:26:27,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:26:27,693 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-18 20:26:27,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:27,694 INFO L225 Difference]: With dead ends: 68 [2020-08-18 20:26:27,694 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:26:27,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:27,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:26:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 20:26:27,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 20:26:27,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-18 20:26:27,703 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-18 20:26:27,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:27,703 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-18 20:26:27,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:26:27,703 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-18 20:26:27,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 20:26:27,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:27,704 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:27,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:26:27,704 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:27,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:27,705 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-18 20:26:27,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:27,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603902476] [2020-08-18 20:26:27,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:27,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:28,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:28,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:28,139 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 20:26:28,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603902476] [2020-08-18 20:26:28,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:28,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:26:28,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723167120] [2020-08-18 20:26:28,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:26:28,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:28,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:26:28,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:26:28,142 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-18 20:26:29,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:29,475 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-18 20:26:29,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:26:29,476 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-18 20:26:29,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:29,476 INFO L225 Difference]: With dead ends: 69 [2020-08-18 20:26:29,477 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 20:26:29,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:29,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 20:26:29,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 20:26:29,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:26:29,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-18 20:26:29,485 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-18 20:26:29,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:29,486 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-18 20:26:29,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:26:29,486 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-18 20:26:29,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:26:29,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:29,487 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:29,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:26:29,487 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:29,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:29,487 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-18 20:26:29,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:29,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626916944] [2020-08-18 20:26:29,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:29,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:29,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,552 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-18 20:26:29,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626916944] [2020-08-18 20:26:29,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:26:29,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:26:29,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192353299] [2020-08-18 20:26:29,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:26:29,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:29,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:26:29,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:26:29,554 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-18 20:26:29,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:29,580 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 20:26:29,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:26:29,580 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-18 20:26:29,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:29,581 INFO L225 Difference]: With dead ends: 66 [2020-08-18 20:26:29,581 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 20:26:29,581 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 [2020-08-18 20:26:29,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 20:26:29,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 20:26:29,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 20:26:29,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 20:26:29,582 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-18 20:26:29,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:29,582 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 20:26:29,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:26:29,583 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 20:26:29,583 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 20:26:29,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:26:29,585 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 20:26:29,842 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-18 20:26:29,848 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 20:26:29,848 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 20:26:29,848 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 20:26:29,849 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 20:26:29,849 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 20:26:29,849 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 20:26:29,849 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-18 20:26:29,849 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-18 20:26:29,849 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-18 20:26:29,849 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-18 20:26:29,850 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-18 20:26:29,850 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-18 20:26:29,850 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-18 20:26:29,850 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-18 20:26:29,850 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 20:26:29,850 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))) [2020-08-18 20:26:29,850 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-18 20:26:29,851 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-18 20:26:29,851 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 20:26:29,851 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-18 20:26:29,851 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-18 20:26:29,851 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-18 20:26:29,851 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-18 20:26:29,851 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-18 20:26:29,852 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-18 20:26:29,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:26:29 BoogieIcfgContainer [2020-08-18 20:26:29,873 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 20:26:29,875 INFO L168 Benchmark]: Toolchain (without parser) took 18196.62 ms. Allocated memory was 149.4 MB in the beginning and 342.9 MB in the end (delta: 193.5 MB). Free memory was 105.7 MB in the beginning and 157.7 MB in the end (delta: -52.0 MB). Peak memory consumption was 141.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,876 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 149.4 MB. Free memory was 123.9 MB in the beginning and 123.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,877 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.87 ms. Allocated memory is still 149.4 MB. Free memory was 105.5 MB in the beginning and 96.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,877 INFO L168 Benchmark]: Boogie Preprocessor took 119.01 ms. Allocated memory was 149.4 MB in the beginning and 205.0 MB in the end (delta: 55.6 MB). Free memory was 96.0 MB in the beginning and 183.2 MB in the end (delta: -87.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,878 INFO L168 Benchmark]: RCFGBuilder took 249.46 ms. Allocated memory is still 205.0 MB. Free memory was 183.2 MB in the beginning and 171.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,879 INFO L168 Benchmark]: TraceAbstraction took 17579.75 ms. Allocated memory was 205.0 MB in the beginning and 342.9 MB in the end (delta: 137.9 MB). Free memory was 170.5 MB in the beginning and 157.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 150.7 MB. Max. memory is 7.1 GB. [2020-08-18 20:26:29,882 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 149.4 MB. Free memory was 123.9 MB in the beginning and 123.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.87 ms. Allocated memory is still 149.4 MB. Free memory was 105.5 MB in the beginning and 96.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.01 ms. Allocated memory was 149.4 MB in the beginning and 205.0 MB in the end (delta: 55.6 MB). Free memory was 96.0 MB in the beginning and 183.2 MB in the end (delta: -87.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 249.46 ms. Allocated memory is still 205.0 MB. Free memory was 183.2 MB in the beginning and 171.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 17579.75 ms. Allocated memory was 205.0 MB in the beginning and 342.9 MB in the end (delta: 137.9 MB). Free memory was 170.5 MB in the beginning and 157.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 150.7 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: 17.2s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 11.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 13.4s 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, 4.5s 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...