/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 13:26:36,418 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 13:26:36,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 13:26:36,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 13:26:36,466 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 13:26:36,475 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 13:26:36,478 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 13:26:36,482 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 13:26:36,485 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 13:26:36,488 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 13:26:36,489 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 13:26:36,490 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 13:26:36,491 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 13:26:36,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 13:26:36,497 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 13:26:36,499 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 13:26:36,500 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 13:26:36,501 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 13:26:36,503 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 13:26:36,513 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 13:26:36,515 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 13:26:36,516 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 13:26:36,518 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 13:26:36,519 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 13:26:36,531 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 13:26:36,544 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 13:26:36,545 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 13:26:36,547 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 13:26:36,547 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 13:26:36,592 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 13:26:36,592 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 13:26:36,594 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 13:26:36,595 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 13:26:36,595 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 13:26:36,595 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 13:26:36,595 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 13:26:36,596 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 13:26:36,596 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 13:26:36,596 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 13:26:36,597 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 13:26:36,597 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 13:26:36,598 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 13:26:36,598 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 13:26:36,598 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 13:26:36,599 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 13:26:36,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 13:26:36,599 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 13:26:36,599 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 13:26:36,599 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 13:26:36,600 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 13:26:36,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 13:26:36,600 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 13:26:36,600 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 13:26:36,600 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 13:26:36,601 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 13:26:36,601 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 13:26:36,601 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 13:26:36,601 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 13:26:36,601 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 -> false [2020-08-21 13:26:36,898 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 13:26:36,910 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 13:26:36,914 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 13:26:36,915 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 13:26:36,915 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 13:26:36,916 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-21 13:26:36,980 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd7246597/6dd37b3d63014735870de1ec56d96aa9/FLAG56e34bdf9 [2020-08-21 13:26:37,438 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 13:26:37,439 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-2.c [2020-08-21 13:26:37,447 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd7246597/6dd37b3d63014735870de1ec56d96aa9/FLAG56e34bdf9 [2020-08-21 13:26:37,853 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dd7246597/6dd37b3d63014735870de1ec56d96aa9 [2020-08-21 13:26:37,863 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 13:26:37,864 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 13:26:37,866 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 13:26:37,866 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 13:26:37,870 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 13:26:37,871 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:26:37" (1/1) ... [2020-08-21 13:26:37,874 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4137acd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:37, skipping insertion in model container [2020-08-21 13:26:37,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:26:37" (1/1) ... [2020-08-21 13:26:37,882 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 13:26:37,897 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 13:26:38,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:26:38,107 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 13:26:38,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:26:38,138 INFO L208 MainTranslator]: Completed translation [2020-08-21 13:26:38,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38 WrapperNode [2020-08-21 13:26:38,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 13:26:38,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 13:26:38,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 13:26:38,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 13:26:38,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,155 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,155 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,236 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (1/1) ... [2020-08-21 13:26:38,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 13:26:38,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 13:26:38,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 13:26:38,245 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 13:26:38,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (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 13:26:38,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 13:26:38,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 13:26:38,311 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 13:26:38,311 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 13:26:38,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 13:26:38,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 13:26:38,312 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 13:26:38,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 13:26:38,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 13:26:38,481 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 13:26:38,481 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 13:26:38,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:26:38 BoogieIcfgContainer [2020-08-21 13:26:38,485 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 13:26:38,486 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 13:26:38,487 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 13:26:38,490 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 13:26:38,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 01:26:37" (1/3) ... [2020-08-21 13:26:38,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e7bd29b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:26:38, skipping insertion in model container [2020-08-21 13:26:38,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:26:38" (2/3) ... [2020-08-21 13:26:38,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e7bd29b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:26:38, skipping insertion in model container [2020-08-21 13:26:38,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:26:38" (3/3) ... [2020-08-21 13:26:38,494 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-2.c [2020-08-21 13:26:38,504 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 13:26:38,511 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 13:26:38,526 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 13:26:38,548 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 13:26:38,549 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 13:26:38,549 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 13:26:38,549 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 13:26:38,549 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 13:26:38,549 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 13:26:38,550 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 13:26:38,550 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 13:26:38,564 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 13:26:38,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 13:26:38,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:38,570 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:38,570 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:38,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:38,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 13:26:38,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:38,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502194171] [2020-08-21 13:26:38,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:38,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:38,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:38,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:38,778 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 13:26:38,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502194171] [2020-08-21 13:26:38,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:26:38,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:26:38,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139256781] [2020-08-21 13:26:38,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:26:38,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:38,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:26:38,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:26:38,812 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 13:26:38,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:38,897 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 13:26:38,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:26:38,907 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 13:26:38,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:38,926 INFO L225 Difference]: With dead ends: 29 [2020-08-21 13:26:38,927 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 13:26:38,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:26:38,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 13:26:38,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 13:26:38,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 13:26:38,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 13:26:38,972 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 13:26:38,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:38,973 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 13:26:38,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:26:38,973 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 13:26:38,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 13:26:38,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:38,974 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:38,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 13:26:38,975 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:38,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:38,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 13:26:38,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:38,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075835844] [2020-08-21 13:26:38,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:38,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:39,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,070 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 13:26:39,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075835844] [2020-08-21 13:26:39,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:39,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 13:26:39,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330208343] [2020-08-21 13:26:39,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 13:26:39,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:39,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 13:26:39,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:26:39,075 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 13:26:39,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:39,102 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 13:26:39,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 13:26:39,103 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 13:26:39,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:39,104 INFO L225 Difference]: With dead ends: 18 [2020-08-21 13:26:39,104 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 13:26:39,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:26:39,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 13:26:39,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 13:26:39,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 13:26:39,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 13:26:39,111 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 13:26:39,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:39,112 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 13:26:39,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 13:26:39,112 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 13:26:39,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 13:26:39,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:39,113 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:39,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 13:26:39,114 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:39,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:39,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 13:26:39,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:39,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530721873] [2020-08-21 13:26:39,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:39,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:39,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,254 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:26:39,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530721873] [2020-08-21 13:26:39,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:39,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 13:26:39,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274737408] [2020-08-21 13:26:39,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 13:26:39,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:39,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 13:26:39,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 13:26:39,263 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 13:26:39,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:39,285 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 13:26:39,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 13:26:39,286 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 13:26:39,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:39,287 INFO L225 Difference]: With dead ends: 19 [2020-08-21 13:26:39,287 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 13:26:39,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 13:26:39,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 13:26:39,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 13:26:39,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 13:26:39,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 13:26:39,293 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 13:26:39,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:39,294 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 13:26:39,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 13:26:39,294 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 13:26:39,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 13:26:39,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:39,295 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:39,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 13:26:39,296 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:39,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:39,296 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 13:26:39,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:39,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720069503] [2020-08-21 13:26:39,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:39,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:39,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,412 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:26:39,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720069503] [2020-08-21 13:26:39,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:39,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 13:26:39,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092237698] [2020-08-21 13:26:39,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 13:26:39,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:39,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 13:26:39,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 13:26:39,415 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 13:26:39,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:39,444 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 13:26:39,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 13:26:39,444 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 13:26:39,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:39,445 INFO L225 Difference]: With dead ends: 20 [2020-08-21 13:26:39,446 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 13:26:39,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 13:26:39,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 13:26:39,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 13:26:39,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 13:26:39,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 13:26:39,451 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 13:26:39,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:39,451 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 13:26:39,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 13:26:39,452 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 13:26:39,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 13:26:39,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:39,453 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:39,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 13:26:39,453 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:39,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:39,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 13:26:39,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:39,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449107536] [2020-08-21 13:26:39,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:39,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:39,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,562 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:26:39,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449107536] [2020-08-21 13:26:39,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:39,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 13:26:39,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720438221] [2020-08-21 13:26:39,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 13:26:39,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:39,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 13:26:39,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:26:39,565 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 13:26:39,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:39,602 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 13:26:39,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 13:26:39,603 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 13:26:39,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:39,603 INFO L225 Difference]: With dead ends: 21 [2020-08-21 13:26:39,604 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 13:26:39,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:26:39,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 13:26:39,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 13:26:39,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 13:26:39,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 13:26:39,610 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 13:26:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:39,611 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 13:26:39,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 13:26:39,611 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 13:26:39,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 13:26:39,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:39,612 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:39,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 13:26:39,613 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:39,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:39,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 13:26:39,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:39,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167026509] [2020-08-21 13:26:39,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:39,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:39,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:39,765 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:26:39,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167026509] [2020-08-21 13:26:39,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:39,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 13:26:39,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084105980] [2020-08-21 13:26:39,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 13:26:39,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:39,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 13:26:39,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 13:26:39,768 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 13:26:39,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:39,812 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 13:26:39,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 13:26:39,813 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 13:26:39,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:39,814 INFO L225 Difference]: With dead ends: 22 [2020-08-21 13:26:39,814 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 13:26:39,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 13:26:39,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 13:26:39,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 13:26:39,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 13:26:39,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 13:26:39,820 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 13:26:39,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:39,820 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 13:26:39,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 13:26:39,821 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 13:26:39,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 13:26:39,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:26:39,821 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:26:39,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 13:26:39,822 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:26:39,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:26:39,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 13:26:39,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:26:39,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496714226] [2020-08-21 13:26:39,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:26:39,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:40,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:26:40,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:26:40,102 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:26:40,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496714226] [2020-08-21 13:26:40,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:26:40,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 13:26:40,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274352943] [2020-08-21 13:26:40,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 13:26:40,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:26:40,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 13:26:40,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-08-21 13:26:40,107 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 12 states. [2020-08-21 13:26:40,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:26:40,213 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-08-21 13:26:40,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 13:26:40,213 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 16 [2020-08-21 13:26:40,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:26:40,214 INFO L225 Difference]: With dead ends: 21 [2020-08-21 13:26:40,214 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 13:26:40,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 13:26:40,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 13:26:40,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 13:26:40,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 13:26:40,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 13:26:40,217 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 16 [2020-08-21 13:26:40,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:26:40,217 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 13:26:40,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 13:26:40,218 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 13:26:40,218 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 13:26:40,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 13:26:40,220 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 13:26:40,349 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 13:26:40,349 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 13:26:40,349 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 13:26:40,349 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 13:26:40,349 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 13:26:40,349 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 13:26:40,350 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 10 20) the Hoare annotation is: true [2020-08-21 13:26:40,350 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 10 20) no Hoare annotation was computed. [2020-08-21 13:26:40,350 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 10 20) no Hoare annotation was computed. [2020-08-21 13:26:40,351 INFO L264 CegarLoopResult]: At program point L14-2(lines 14 17) the Hoare annotation is: (let ((.cse1 (div main_~x~0 4294967296))) (or (let ((.cse0 (* 4294967296 .cse1))) (and (< (+ .cse0 5) main_~x~0) (<= main_~x~0 (+ .cse0 6)) (<= 0 .cse1))) (and (<= main_~x~0 5) (<= 5 main_~x~0)) (and (< 0 (+ .cse1 1)) (<= main_~x~0 4)))) [2020-08-21 13:26:40,351 INFO L264 CegarLoopResult]: At program point L14-3(lines 14 17) the Hoare annotation is: (let ((.cse1 (div main_~x~0 4294967296))) (let ((.cse0 (* 4294967296 .cse1))) (and (< (+ .cse0 5) main_~x~0) (<= main_~x~0 (+ .cse0 6)) (<= 0 .cse1)))) [2020-08-21 13:26:40,351 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-21 13:26:40,351 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-21 13:26:40,352 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 13:26:40,353 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-21 13:26:40,354 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-21 13:26:40,354 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-21 13:26:40,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 01:26:40 BoogieIcfgContainer [2020-08-21 13:26:40,384 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 13:26:40,387 INFO L168 Benchmark]: Toolchain (without parser) took 2521.30 ms. Allocated memory was 140.5 MB in the beginning and 235.4 MB in the end (delta: 94.9 MB). Free memory was 103.9 MB in the beginning and 146.1 MB in the end (delta: -42.3 MB). Peak memory consumption was 52.6 MB. Max. memory is 7.1 GB. [2020-08-21 13:26:40,388 INFO L168 Benchmark]: CDTParser took 0.13 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: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 13:26:40,388 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.91 ms. Allocated memory is still 140.5 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-21 13:26:40,389 INFO L168 Benchmark]: Boogie Preprocessor took 104.94 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 94.2 MB in the beginning and 181.6 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-21 13:26:40,390 INFO L168 Benchmark]: RCFGBuilder took 240.36 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 169.9 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2020-08-21 13:26:40,391 INFO L168 Benchmark]: TraceAbstraction took 1897.40 ms. Allocated memory was 202.9 MB in the beginning and 235.4 MB in the end (delta: 32.5 MB). Free memory was 169.9 MB in the beginning and 146.1 MB in the end (delta: 23.7 MB). Peak memory consumption was 56.2 MB. Max. memory is 7.1 GB. [2020-08-21 13:26:40,395 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 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: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 273.91 ms. Allocated memory is still 140.5 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 104.94 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 94.2 MB in the beginning and 181.6 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 240.36 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 169.9 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1897.40 ms. Allocated memory was 202.9 MB in the beginning and 235.4 MB in the end (delta: 32.5 MB). Free memory was 169.9 MB in the beginning and 146.1 MB in the end (delta: 23.7 MB). Peak memory consumption was 56.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: (((4294967296 * (x / 4294967296) + 5 < x && x <= 4294967296 * (x / 4294967296) + 6) && 0 <= x / 4294967296) || (x <= 5 && 5 <= x)) || (0 < x / 4294967296 + 1 && x <= 4) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1.6s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 72 SDtfs, 2 SDslu, 212 SDs, 0 SdLazy, 174 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 60 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 14 PreInvPairs, 22 NumberOfFragments, 72 HoareAnnotationTreeSize, 14 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 59 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 84 ConstructedInterpolants, 0 QuantifiedInterpolants, 4045 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/56 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...