/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:46:27,282 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 19:46:27,326 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:46:27,329 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:46:27,333 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:46:27,336 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:46:27,341 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:46:27,341 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:46:27,342 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:46:27,345 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:46:27,345 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:46:27,349 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:46:27,351 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:46:27,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:46:27,354 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:46:27,357 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:46:27,359 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:46:27,365 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:46:27,367 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:46:27,369 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:46:27,370 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:46:27,370 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:46:27,374 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:46:27,395 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:46:27,400 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:46:27,400 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:46:27,404 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:46:27,440 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:46:27,440 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:46:27,446 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:46:27,447 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:46:27,447 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:46:27,447 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:46:27,447 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:46:27,447 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:46:27,448 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:46:27,448 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:46:27,448 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:46:27,448 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:46:27,448 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:46:27,449 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:46:27,449 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:46:27,449 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:46:27,449 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:46:27,449 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:46:27,450 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:46:27,450 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:46:27,450 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:46:27,450 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:46:27,450 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:46:27,451 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:46:27,452 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:46:27,740 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:46:27,753 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:46:27,757 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:46:27,758 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:46:27,759 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:46:27,759 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 19:46:27,839 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44878e9dc/c610a3cc8e1a4c69a709148b0934912f/FLAG3c7cd2630 [2020-08-21 19:46:28,330 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:46:28,331 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 19:46:28,338 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44878e9dc/c610a3cc8e1a4c69a709148b0934912f/FLAG3c7cd2630 [2020-08-21 19:46:28,698 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/44878e9dc/c610a3cc8e1a4c69a709148b0934912f [2020-08-21 19:46:28,706 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:46:28,707 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:46:28,708 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:46:28,709 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:46:28,712 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:46:28,713 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:46:28" (1/1) ... [2020-08-21 19:46:28,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e7cadc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:28, skipping insertion in model container [2020-08-21 19:46:28,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:46:28" (1/1) ... [2020-08-21 19:46:28,724 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:46:28,741 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:46:28,939 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:46:28,947 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:46:28,965 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:46:29,063 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:46:29,063 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29 WrapperNode [2020-08-21 19:46:29,063 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:46:29,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:46:29,064 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:46:29,064 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:46:29,076 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,076 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,084 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,085 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,109 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,111 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... [2020-08-21 19:46:29,113 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:46:29,114 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:46:29,114 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:46:29,114 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:46:29,115 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:46:29,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:46:29,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:46:29,170 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 19:46:29,171 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:46:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:46:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 19:46:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 19:46:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 19:46:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:46:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:46:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 19:46:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:46:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:46:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:46:29,422 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:46:29,423 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 19:46:29,427 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:46:29 BoogieIcfgContainer [2020-08-21 19:46:29,428 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:46:29,429 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:46:29,429 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:46:29,433 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:46:29,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:46:28" (1/3) ... [2020-08-21 19:46:29,434 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231990c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:46:29, skipping insertion in model container [2020-08-21 19:46:29,434 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:46:29" (2/3) ... [2020-08-21 19:46:29,434 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231990c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:46:29, skipping insertion in model container [2020-08-21 19:46:29,434 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:46:29" (3/3) ... [2020-08-21 19:46:29,436 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 19:46:29,447 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:46:29,455 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:46:29,471 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:46:29,506 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:46:29,507 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:46:29,507 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:46:29,507 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:46:29,507 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:46:29,507 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:46:29,513 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:46:29,513 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:46:29,536 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 19:46:29,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 19:46:29,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:29,545 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:29,546 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:29,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:29,553 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 19:46:29,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:29,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303127810] [2020-08-21 19:46:29,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:29,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:29,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:29,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:29,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 19:46:29,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:29,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:29,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303127810] [2020-08-21 19:46:29,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:46:29,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:46:29,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800270545] [2020-08-21 19:46:29,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:46:29,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:29,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:46:29,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:46:29,770 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 19:46:29,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:29,885 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 19:46:29,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:46:29,887 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 19:46:29,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:29,898 INFO L225 Difference]: With dead ends: 42 [2020-08-21 19:46:29,898 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:46:29,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:46:29,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:46:29,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:46:29,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:46:29,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 19:46:29,939 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 19:46:29,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:29,940 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 19:46:29,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:46:29,940 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 19:46:29,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 19:46:29,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:29,941 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:29,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:46:29,942 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:29,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:29,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 19:46:29,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:29,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018296587] [2020-08-21 19:46:29,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:29,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 19:46:30,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018296587] [2020-08-21 19:46:30,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:46:30,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:46:30,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137466986] [2020-08-21 19:46:30,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:46:30,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:46:30,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:46:30,028 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 19:46:30,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:30,097 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 19:46:30,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:46:30,098 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 19:46:30,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:30,099 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:46:30,099 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 19:46:30,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:46:30,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 19:46:30,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 19:46:30,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:46:30,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 19:46:30,107 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 19:46:30,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:30,108 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 19:46:30,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:46:30,108 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 19:46:30,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:46:30,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:30,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:30,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:46:30,110 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:30,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:30,110 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 19:46:30,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:30,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132215308] [2020-08-21 19:46:30,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:30,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 19:46:30,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132215308] [2020-08-21 19:46:30,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:30,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:46:30,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620059141] [2020-08-21 19:46:30,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:46:30,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:46:30,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:46:30,202 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 19:46:30,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:30,255 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 19:46:30,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:46:30,256 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 19:46:30,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:30,257 INFO L225 Difference]: With dead ends: 36 [2020-08-21 19:46:30,257 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 19:46:30,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:46:30,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 19:46:30,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 19:46:30,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:46:30,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 19:46:30,264 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 19:46:30,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:30,264 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 19:46:30,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:46:30,265 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 19:46:30,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:46:30,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:30,266 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:30,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:46:30,266 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:30,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:30,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 19:46:30,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:30,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276926674] [2020-08-21 19:46:30,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:30,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 19:46:30,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276926674] [2020-08-21 19:46:30,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:30,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:46:30,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869150817] [2020-08-21 19:46:30,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:46:30,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:46:30,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:46:30,358 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 19:46:30,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:30,429 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 19:46:30,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:46:30,430 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 19:46:30,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:30,431 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:46:30,431 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:46:30,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:46:30,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:46:30,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 19:46:30,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 19:46:30,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 19:46:30,439 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 19:46:30,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:30,439 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 19:46:30,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:46:30,440 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 19:46:30,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:46:30,441 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:30,441 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:30,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:46:30,442 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:30,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:30,442 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 19:46:30,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:30,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861050551] [2020-08-21 19:46:30,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:30,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 19:46:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,545 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861050551] [2020-08-21 19:46:30,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:30,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:46:30,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092062506] [2020-08-21 19:46:30,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:46:30,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:46:30,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:46:30,548 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 19:46:30,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:30,611 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 19:46:30,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:46:30,612 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 19:46:30,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:30,613 INFO L225 Difference]: With dead ends: 40 [2020-08-21 19:46:30,613 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 19:46:30,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:46:30,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 19:46:30,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 19:46:30,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 19:46:30,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 19:46:30,620 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 19:46:30,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:30,620 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 19:46:30,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:46:30,620 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 19:46:30,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 19:46:30,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:30,621 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:30,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:46:30,622 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:30,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:30,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 19:46:30,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:30,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [673641665] [2020-08-21 19:46:30,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:30,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 19:46:30,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,722 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [673641665] [2020-08-21 19:46:30,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:30,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:46:30,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138677721] [2020-08-21 19:46:30,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:46:30,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:46:30,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:46:30,725 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 19:46:30,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:30,789 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 19:46:30,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:46:30,790 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 19:46:30,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:30,791 INFO L225 Difference]: With dead ends: 42 [2020-08-21 19:46:30,791 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 19:46:30,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:46:30,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 19:46:30,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 19:46:30,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:46:30,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 19:46:30,798 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 19:46:30,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:30,798 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 19:46:30,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:46:30,799 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 19:46:30,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:46:30,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:30,800 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:30,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:46:30,800 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:30,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:30,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 19:46:30,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:30,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823558390] [2020-08-21 19:46:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:30,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 19:46:30,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:30,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823558390] [2020-08-21 19:46:30,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:30,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:46:30,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520267192] [2020-08-21 19:46:30,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:46:30,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:30,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:46:30,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:46:30,927 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 19:46:31,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:31,018 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 19:46:31,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:46:31,019 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 19:46:31,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:31,020 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:46:31,020 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:46:31,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:46:31,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:46:31,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 19:46:31,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 19:46:31,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 19:46:31,027 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 19:46:31,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:31,027 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 19:46:31,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:46:31,027 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 19:46:31,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 19:46:31,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:31,029 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:31,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:46:31,029 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:31,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:31,030 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 19:46:31,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:31,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017930852] [2020-08-21 19:46:31,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:31,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:31,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 19:46:31,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,131 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:31,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017930852] [2020-08-21 19:46:31,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:31,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:46:31,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794182751] [2020-08-21 19:46:31,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:46:31,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:31,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:46:31,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:46:31,134 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 19:46:31,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:31,205 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 19:46:31,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:46:31,206 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 19:46:31,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:31,207 INFO L225 Difference]: With dead ends: 46 [2020-08-21 19:46:31,207 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:46:31,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:46:31,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:46:31,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 19:46:31,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:46:31,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 19:46:31,213 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 19:46:31,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:31,214 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 19:46:31,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:46:31,214 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 19:46:31,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:46:31,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:31,215 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:31,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:46:31,215 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:31,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:31,216 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 19:46:31,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:31,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175114043] [2020-08-21 19:46:31,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:31,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:31,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 19:46:31,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,330 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:31,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175114043] [2020-08-21 19:46:31,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:31,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:46:31,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837253551] [2020-08-21 19:46:31,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:46:31,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:31,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:46:31,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:46:31,333 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 19:46:31,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:31,420 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 19:46:31,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:46:31,421 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 19:46:31,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:31,422 INFO L225 Difference]: With dead ends: 48 [2020-08-21 19:46:31,422 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:46:31,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:46:31,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:46:31,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 19:46:31,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:46:31,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 19:46:31,430 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 19:46:31,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:31,430 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 19:46:31,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:46:31,431 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 19:46:31,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:46:31,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:31,432 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:31,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:46:31,433 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:31,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:31,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 19:46:31,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:31,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851657120] [2020-08-21 19:46:31,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:31,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:31,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 19:46:31,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,564 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:31,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851657120] [2020-08-21 19:46:31,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:31,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:46:31,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721443126] [2020-08-21 19:46:31,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:46:31,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:31,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:46:31,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:46:31,567 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 19:46:31,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:31,643 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 19:46:31,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:46:31,643 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 19:46:31,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:31,644 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:46:31,644 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:46:31,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:46:31,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:46:31,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 19:46:31,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:46:31,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 19:46:31,650 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 19:46:31,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:31,650 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 19:46:31,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:46:31,651 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 19:46:31,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:46:31,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:31,652 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:31,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:46:31,652 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:31,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:31,652 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 19:46:31,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:31,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389496009] [2020-08-21 19:46:31,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:31,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:31,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 19:46:31,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,772 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:31,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389496009] [2020-08-21 19:46:31,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:31,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:46:31,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815895317] [2020-08-21 19:46:31,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:46:31,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:31,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:46:31,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:46:31,775 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 19:46:31,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:31,846 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 19:46:31,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:46:31,847 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 19:46:31,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:31,848 INFO L225 Difference]: With dead ends: 52 [2020-08-21 19:46:31,848 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:46:31,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:46:31,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:46:31,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 19:46:31,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:46:31,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 19:46:31,854 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 19:46:31,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:31,854 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 19:46:31,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:46:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 19:46:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:46:31,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:31,855 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:31,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:46:31,856 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:31,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:31,856 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 19:46:31,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:31,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693067347] [2020-08-21 19:46:31,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:31,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:31,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 19:46:31,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:31,991 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:31,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693067347] [2020-08-21 19:46:31,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:31,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:46:31,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792034128] [2020-08-21 19:46:31,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:46:31,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:31,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:46:31,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:46:31,994 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 19:46:32,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:32,086 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 19:46:32,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:46:32,087 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 19:46:32,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:32,088 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:46:32,088 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:46:32,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:46:32,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:46:32,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 19:46:32,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:46:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 19:46:32,093 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 19:46:32,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:32,094 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 19:46:32,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:46:32,094 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 19:46:32,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:46:32,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:32,095 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:32,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:46:32,095 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:32,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:32,096 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 19:46:32,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:32,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139401542] [2020-08-21 19:46:32,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:32,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 19:46:32,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,265 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:32,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139401542] [2020-08-21 19:46:32,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:32,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:46:32,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782032456] [2020-08-21 19:46:32,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:46:32,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:32,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:46:32,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:46:32,268 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 19:46:32,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:32,365 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 19:46:32,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:46:32,365 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 19:46:32,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:32,366 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:46:32,366 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:46:32,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:46:32,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:46:32,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 19:46:32,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:46:32,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 19:46:32,372 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 19:46:32,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:32,372 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 19:46:32,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:46:32,373 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 19:46:32,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:46:32,373 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:32,374 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:32,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:46:32,374 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:32,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:32,374 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 19:46:32,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:32,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104640787] [2020-08-21 19:46:32,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:32,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:32,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 19:46:32,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,543 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:32,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104640787] [2020-08-21 19:46:32,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:32,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:46:32,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489339260] [2020-08-21 19:46:32,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:46:32,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:32,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:46:32,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:46:32,545 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 19:46:32,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:32,629 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 19:46:32,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:46:32,629 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 19:46:32,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:32,630 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:46:32,630 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:46:32,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:46:32,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:46:32,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 19:46:32,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:46:32,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 19:46:32,636 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 19:46:32,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:32,637 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 19:46:32,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:46:32,637 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 19:46:32,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:46:32,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:32,638 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:32,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:46:32,639 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:32,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:32,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 19:46:32,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:32,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051096881] [2020-08-21 19:46:32,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:32,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:32,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 19:46:32,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:32,814 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:32,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051096881] [2020-08-21 19:46:32,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:32,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:46:32,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24315085] [2020-08-21 19:46:32,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:46:32,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:32,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:46:32,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:46:32,816 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 19:46:32,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:32,943 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 19:46:32,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:46:32,944 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 19:46:32,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:32,945 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:46:32,945 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:46:32,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:46:32,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:46:32,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 19:46:32,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 19:46:32,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 19:46:32,951 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 19:46:32,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:32,951 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 19:46:32,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:46:32,951 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 19:46:32,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:46:32,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:32,952 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:32,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:46:32,953 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:32,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:32,953 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 19:46:32,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:32,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771189918] [2020-08-21 19:46:32,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:32,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:33,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 19:46:33,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,148 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:33,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771189918] [2020-08-21 19:46:33,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:33,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:46:33,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886914133] [2020-08-21 19:46:33,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:46:33,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:33,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:46:33,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:46:33,151 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 19:46:33,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:33,251 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 19:46:33,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:46:33,252 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 19:46:33,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:33,253 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:46:33,253 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 19:46:33,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:46:33,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 19:46:33,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 19:46:33,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:46:33,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 19:46:33,264 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 19:46:33,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:33,265 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 19:46:33,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:46:33,267 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 19:46:33,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:46:33,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:33,268 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:33,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:46:33,270 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:33,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:33,270 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 19:46:33,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:33,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476880871] [2020-08-21 19:46:33,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:33,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:33,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 19:46:33,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,503 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:33,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476880871] [2020-08-21 19:46:33,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:33,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:46:33,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2341694] [2020-08-21 19:46:33,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:46:33,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:33,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:46:33,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:46:33,506 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 19:46:33,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:33,589 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 19:46:33,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:46:33,589 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 19:46:33,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:33,590 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:46:33,590 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:46:33,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:46:33,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:46:33,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 19:46:33,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:46:33,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 19:46:33,595 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 19:46:33,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:33,596 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 19:46:33,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:46:33,596 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 19:46:33,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:46:33,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:33,597 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:33,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:46:33,597 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:33,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:33,598 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 19:46:33,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:33,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062648808] [2020-08-21 19:46:33,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:33,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:33,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 19:46:33,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:33,854 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:33,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062648808] [2020-08-21 19:46:33,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:33,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:46:33,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614400415] [2020-08-21 19:46:33,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:46:33,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:33,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:46:33,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:46:33,857 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 19:46:33,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:33,952 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 19:46:33,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:46:33,953 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 19:46:33,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:33,954 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:46:33,954 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 19:46:33,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:46:33,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 19:46:33,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 19:46:33,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:46:33,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 19:46:33,959 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 19:46:33,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:33,960 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 19:46:33,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:46:33,960 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 19:46:33,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:46:33,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:33,961 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:33,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:46:33,961 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:33,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:33,961 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 19:46:33,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:33,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640184203] [2020-08-21 19:46:33,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:33,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:34,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 19:46:34,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,222 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:34,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640184203] [2020-08-21 19:46:34,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:34,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:46:34,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915366290] [2020-08-21 19:46:34,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:46:34,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:34,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:46:34,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:46:34,224 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 19:46:34,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:34,346 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 19:46:34,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:46:34,346 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 19:46:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:34,347 INFO L225 Difference]: With dead ends: 68 [2020-08-21 19:46:34,347 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 19:46:34,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:46:34,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 19:46:34,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 19:46:34,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:46:34,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 19:46:34,354 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 19:46:34,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:34,354 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 19:46:34,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:46:34,354 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 19:46:34,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:46:34,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:34,355 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:34,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:46:34,355 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:34,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:34,356 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 19:46:34,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:34,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979948392] [2020-08-21 19:46:34,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:34,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:34,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 19:46:34,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:34,644 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:34,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979948392] [2020-08-21 19:46:34,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:34,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:46:34,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123051802] [2020-08-21 19:46:34,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:46:34,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:34,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:46:34,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:46:34,647 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 19:46:34,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:34,741 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 19:46:34,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:46:34,741 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 19:46:34,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:34,742 INFO L225 Difference]: With dead ends: 70 [2020-08-21 19:46:34,742 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 19:46:34,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:46:34,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 19:46:34,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 19:46:34,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:46:34,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 19:46:34,747 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 19:46:34,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:34,748 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 19:46:34,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:46:34,748 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 19:46:34,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:46:34,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:34,749 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:34,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:46:34,749 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:34,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:34,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 19:46:34,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:34,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28143589] [2020-08-21 19:46:34,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:34,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:35,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:46:35,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:35,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 19:46:35,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:46:35,024 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:46:35,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28143589] [2020-08-21 19:46:35,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:46:35,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:46:35,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311875886] [2020-08-21 19:46:35,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:46:35,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:46:35,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:46:35,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:46:35,028 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 19:46:35,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:46:35,151 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 19:46:35,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:46:35,151 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 19:46:35,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:46:35,152 INFO L225 Difference]: With dead ends: 71 [2020-08-21 19:46:35,152 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 19:46:35,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:46:35,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 19:46:35,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 19:46:35,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:46:35,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 19:46:35,161 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 19:46:35,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:46:35,162 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 19:46:35,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:46:35,162 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 19:46:35,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:46:35,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:46:35,162 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:46:35,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:46:35,163 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:46:35,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:46:35,163 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 19:46:35,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:46:35,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316311723] [2020-08-21 19:46:35,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:46:35,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 19:46:35,318 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 19:46:35,319 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 19:46:35,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:46:35,356 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:46:35 BoogieIcfgContainer [2020-08-21 19:46:35,356 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:46:35,358 INFO L168 Benchmark]: Toolchain (without parser) took 6650.57 ms. Allocated memory was 140.5 MB in the beginning and 303.6 MB in the end (delta: 163.1 MB). Free memory was 103.3 MB in the beginning and 155.8 MB in the end (delta: -52.4 MB). Peak memory consumption was 110.6 MB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,359 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,360 INFO L168 Benchmark]: CACSL2BoogieTranslator took 355.40 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 103.1 MB in the beginning and 183.0 MB in the end (delta: -79.9 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,361 INFO L168 Benchmark]: Boogie Preprocessor took 49.48 ms. Allocated memory is still 203.9 MB. Free memory was 183.0 MB in the beginning and 180.7 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,361 INFO L168 Benchmark]: RCFGBuilder took 313.90 ms. Allocated memory is still 203.9 MB. Free memory was 180.7 MB in the beginning and 165.0 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,362 INFO L168 Benchmark]: TraceAbstraction took 5927.41 ms. Allocated memory was 203.9 MB in the beginning and 303.6 MB in the end (delta: 99.6 MB). Free memory was 164.4 MB in the beginning and 155.8 MB in the end (delta: 8.7 MB). Peak memory consumption was 108.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:46:35,365 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 355.40 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 103.1 MB in the beginning and 183.0 MB in the end (delta: -79.9 MB). Peak memory consumption was 22.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 49.48 ms. Allocated memory is still 203.9 MB. Free memory was 183.0 MB in the beginning and 180.7 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 313.90 ms. Allocated memory is still 203.9 MB. Free memory was 180.7 MB in the beginning and 165.0 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5927.41 ms. Allocated memory was 203.9 MB in the beginning and 303.6 MB in the end (delta: 99.6 MB). Free memory was 164.4 MB in the beginning and 155.8 MB in the end (delta: 8.7 MB). Peak memory consumption was 108.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.8s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 1.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.8s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 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 incorrect! Received shutdown request...