/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:14:04,440 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:14:04,442 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:14:04,465 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:14:04,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:14:04,466 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:14:04,467 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:14:04,469 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:14:04,471 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:14:04,471 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:14:04,472 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:14:04,473 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:14:04,474 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:14:04,475 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:14:04,476 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:14:04,477 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:14:04,478 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:14:04,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:14:04,480 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:14:04,482 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:14:04,483 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:14:04,484 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:14:04,485 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:14:04,486 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:14:04,488 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:14:04,501 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:14:04,502 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:14:04,502 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:14:04,503 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 21:14:04,548 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:14:04,550 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:14:04,551 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:14:04,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:14:04,552 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:14:04,552 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:14:04,552 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:14:04,552 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:14:04,553 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:14:04,554 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:14:04,555 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:14:04,555 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:14:04,555 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:14:04,555 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:14:04,556 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:14:04,556 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:14:04,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:04,556 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:14:04,557 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:14:04,557 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:14:04,557 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:14:04,557 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:14:04,557 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:14:04,558 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:14:04,558 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:14:04,865 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:14:04,878 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:14:04,881 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:14:04,883 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:14:04,883 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:14:04,884 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-08-18 21:14:04,954 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c14398a1f/516c163f946849008b3752a911049770/FLAG624d2adac [2020-08-18 21:14:05,482 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:14:05,484 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-08-18 21:14:05,492 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c14398a1f/516c163f946849008b3752a911049770/FLAG624d2adac [2020-08-18 21:14:05,832 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c14398a1f/516c163f946849008b3752a911049770 [2020-08-18 21:14:05,842 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:14:05,844 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:14:05,845 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:05,845 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:14:05,848 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:14:05,849 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,852 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@570ad94a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05, skipping insertion in model container [2020-08-18 21:14:05,853 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,861 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:14:05,878 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:14:06,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:06,050 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:14:06,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:06,087 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:14:06,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06 WrapperNode [2020-08-18 21:14:06,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:06,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:14:06,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:14:06,089 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:14:06,196 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,203 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,204 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,209 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,215 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,216 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... [2020-08-18 21:14:06,218 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:14:06,218 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:14:06,219 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:14:06,219 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:14:06,220 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:06,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:14:06,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:14:06,285 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:14:06,285 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:14:06,286 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 21:14:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 21:14:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:14:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:14:06,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:14:06,486 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:14:06,487 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 21:14:06,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:06 BoogieIcfgContainer [2020-08-18 21:14:06,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:14:06,492 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:14:06,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:14:06,495 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:14:06,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:14:05" (1/3) ... [2020-08-18 21:14:06,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f0e043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:06, skipping insertion in model container [2020-08-18 21:14:06,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:06" (2/3) ... [2020-08-18 21:14:06,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f0e043 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:06, skipping insertion in model container [2020-08-18 21:14:06,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:06" (3/3) ... [2020-08-18 21:14:06,499 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-08-18 21:14:06,508 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:14:06,514 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:14:06,526 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:14:06,549 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:14:06,549 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:14:06,549 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:14:06,550 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:14:06,550 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:14:06,550 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:14:06,550 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:14:06,550 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:14:06,571 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 21:14:06,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:14:06,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,577 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,577 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,582 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-08-18 21:14:06,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417533185] [2020-08-18 21:14:06,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417533185] [2020-08-18 21:14:06,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:06,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:14:06,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48933072] [2020-08-18 21:14:06,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:14:06,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:14:06,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:06,875 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 21:14:06,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,960 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 21:14:06,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:14:06,962 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 21:14:06,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,971 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:14:06,971 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 21:14:06,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:06,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 21:14:07,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 21:14:07,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 21:14:07,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 21:14:07,009 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-08-18 21:14:07,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,009 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 21:14:07,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:14:07,010 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 21:14:07,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 21:14:07,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,011 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:14:07,012 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,012 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-08-18 21:14:07,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928361642] [2020-08-18 21:14:07,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928361642] [2020-08-18 21:14:07,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:07,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:14:07,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427762383] [2020-08-18 21:14:07,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:14:07,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:14:07,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:07,114 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2020-08-18 21:14:07,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,195 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-18 21:14:07,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:14:07,196 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-08-18 21:14:07,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,198 INFO L225 Difference]: With dead ends: 35 [2020-08-18 21:14:07,199 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 21:14:07,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:07,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 21:14:07,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 21:14:07,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 21:14:07,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-08-18 21:14:07,209 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-08-18 21:14:07,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,209 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-08-18 21:14:07,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:14:07,210 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-08-18 21:14:07,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:14:07,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:14:07,211 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-08-18 21:14:07,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805473926] [2020-08-18 21:14:07,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805473926] [2020-08-18 21:14:07,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:14:07,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259921236] [2020-08-18 21:14:07,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:14:07,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:14:07,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:07,287 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-08-18 21:14:07,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,379 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2020-08-18 21:14:07,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:14:07,380 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-18 21:14:07,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,381 INFO L225 Difference]: With dead ends: 45 [2020-08-18 21:14:07,381 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:14:07,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:07,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:14:07,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-08-18 21:14:07,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 21:14:07,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 21:14:07,390 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2020-08-18 21:14:07,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,390 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 21:14:07,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:14:07,391 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 21:14:07,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:14:07,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,392 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:14:07,392 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1185071985, now seen corresponding path program 2 times [2020-08-18 21:14:07,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491550076] [2020-08-18 21:14:07,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,481 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491550076] [2020-08-18 21:14:07,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:14:07,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936617461] [2020-08-18 21:14:07,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:14:07,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:14:07,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:07,485 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 21:14:07,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,586 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2020-08-18 21:14:07,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:14:07,586 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-08-18 21:14:07,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,587 INFO L225 Difference]: With dead ends: 56 [2020-08-18 21:14:07,588 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 21:14:07,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:07,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 21:14:07,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2020-08-18 21:14:07,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 21:14:07,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-18 21:14:07,597 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 18 [2020-08-18 21:14:07,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,598 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-18 21:14:07,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:14:07,598 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-18 21:14:07,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:14:07,599 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,599 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:14:07,600 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,601 INFO L82 PathProgramCache]: Analyzing trace with hash 885408339, now seen corresponding path program 3 times [2020-08-18 21:14:07,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885302873] [2020-08-18 21:14:07,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,731 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885302873] [2020-08-18 21:14:07,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:14:07,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735085602] [2020-08-18 21:14:07,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:07,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:07,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:07,739 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-08-18 21:14:07,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,857 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2020-08-18 21:14:07,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:07,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2020-08-18 21:14:07,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,859 INFO L225 Difference]: With dead ends: 67 [2020-08-18 21:14:07,859 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 21:14:07,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:07,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 21:14:07,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2020-08-18 21:14:07,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 21:14:07,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2020-08-18 21:14:07,868 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 20 [2020-08-18 21:14:07,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,868 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2020-08-18 21:14:07,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:07,869 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2020-08-18 21:14:07,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:14:07,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,870 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:14:07,870 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,871 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 4 times [2020-08-18 21:14:07,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810228054] [2020-08-18 21:14:07,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,947 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-18 21:14:07,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810228054] [2020-08-18 21:14:07,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:07,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 21:14:07,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430003356] [2020-08-18 21:14:07,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:14:07,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:14:07,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:07,950 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 6 states. [2020-08-18 21:14:08,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,053 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-08-18 21:14:08,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:14:08,054 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 21:14:08,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,056 INFO L225 Difference]: With dead ends: 45 [2020-08-18 21:14:08,057 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 21:14:08,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:08,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 21:14:08,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 21:14:08,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 21:14:08,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-08-18 21:14:08,072 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 22 [2020-08-18 21:14:08,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,072 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-08-18 21:14:08,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:14:08,073 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-08-18 21:14:08,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:14:08,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,074 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:14:08,075 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1732065724, now seen corresponding path program 1 times [2020-08-18 21:14:08,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271490084] [2020-08-18 21:14:08,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,222 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:08,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271490084] [2020-08-18 21:14:08,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:14:08,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498439400] [2020-08-18 21:14:08,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:14:08,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:14:08,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:08,226 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 8 states. [2020-08-18 21:14:08,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,351 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2020-08-18 21:14:08,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:14:08,352 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 21:14:08,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,353 INFO L225 Difference]: With dead ends: 77 [2020-08-18 21:14:08,353 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 21:14:08,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:08,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 21:14:08,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-08-18 21:14:08,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 21:14:08,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2020-08-18 21:14:08,369 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 26 [2020-08-18 21:14:08,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,369 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2020-08-18 21:14:08,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:14:08,369 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2020-08-18 21:14:08,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:14:08,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,371 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:14:08,371 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,372 INFO L82 PathProgramCache]: Analyzing trace with hash 359446174, now seen corresponding path program 2 times [2020-08-18 21:14:08,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998932024] [2020-08-18 21:14:08,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,522 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:08,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998932024] [2020-08-18 21:14:08,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:14:08,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096281412] [2020-08-18 21:14:08,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:14:08,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:14:08,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:08,527 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 9 states. [2020-08-18 21:14:08,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,643 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2020-08-18 21:14:08,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:14:08,644 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 21:14:08,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,645 INFO L225 Difference]: With dead ends: 88 [2020-08-18 21:14:08,645 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 21:14:08,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:08,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 21:14:08,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 52. [2020-08-18 21:14:08,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 21:14:08,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2020-08-18 21:14:08,659 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 28 [2020-08-18 21:14:08,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,659 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2020-08-18 21:14:08,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:14:08,660 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2020-08-18 21:14:08,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:14:08,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,663 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:14:08,663 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,664 INFO L82 PathProgramCache]: Analyzing trace with hash -172981504, now seen corresponding path program 3 times [2020-08-18 21:14:08,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989998324] [2020-08-18 21:14:08,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,805 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:08,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989998324] [2020-08-18 21:14:08,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:14:08,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76894165] [2020-08-18 21:14:08,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:14:08,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:14:08,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:08,808 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand 10 states. [2020-08-18 21:14:08,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,954 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2020-08-18 21:14:08,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:14:08,955 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 21:14:08,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,956 INFO L225 Difference]: With dead ends: 99 [2020-08-18 21:14:08,957 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 21:14:08,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:08,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 21:14:08,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2020-08-18 21:14:08,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 21:14:08,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2020-08-18 21:14:08,965 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 30 [2020-08-18 21:14:08,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,965 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2020-08-18 21:14:08,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:14:08,966 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2020-08-18 21:14:08,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:14:08,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,967 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:14:08,968 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,968 INFO L82 PathProgramCache]: Analyzing trace with hash -734871838, now seen corresponding path program 4 times [2020-08-18 21:14:08,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783694482] [2020-08-18 21:14:08,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,088 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:09,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783694482] [2020-08-18 21:14:09,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:14:09,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522253917] [2020-08-18 21:14:09,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:14:09,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:14:09,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:09,091 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 11 states. [2020-08-18 21:14:09,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,226 INFO L93 Difference]: Finished difference Result 110 states and 128 transitions. [2020-08-18 21:14:09,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:14:09,227 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 21:14:09,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,228 INFO L225 Difference]: With dead ends: 110 [2020-08-18 21:14:09,228 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 21:14:09,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:09,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 21:14:09,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 64. [2020-08-18 21:14:09,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 21:14:09,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2020-08-18 21:14:09,236 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 32 [2020-08-18 21:14:09,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,236 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2020-08-18 21:14:09,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:14:09,236 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2020-08-18 21:14:09,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:14:09,237 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,237 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:14:09,238 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,238 INFO L82 PathProgramCache]: Analyzing trace with hash 454396484, now seen corresponding path program 5 times [2020-08-18 21:14:09,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506685169] [2020-08-18 21:14:09,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,342 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:09,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506685169] [2020-08-18 21:14:09,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:14:09,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752436660] [2020-08-18 21:14:09,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:14:09,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:14:09,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:09,344 INFO L87 Difference]: Start difference. First operand 64 states and 73 transitions. Second operand 12 states. [2020-08-18 21:14:09,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,464 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2020-08-18 21:14:09,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:14:09,464 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 21:14:09,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,465 INFO L225 Difference]: With dead ends: 121 [2020-08-18 21:14:09,466 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 21:14:09,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:09,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 21:14:09,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 70. [2020-08-18 21:14:09,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 21:14:09,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 80 transitions. [2020-08-18 21:14:09,474 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 80 transitions. Word has length 34 [2020-08-18 21:14:09,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,474 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 80 transitions. [2020-08-18 21:14:09,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:14:09,475 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 80 transitions. [2020-08-18 21:14:09,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:14:09,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,476 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:14:09,476 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,477 INFO L82 PathProgramCache]: Analyzing trace with hash 879953190, now seen corresponding path program 6 times [2020-08-18 21:14:09,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571863536] [2020-08-18 21:14:09,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,584 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:09,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571863536] [2020-08-18 21:14:09,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:14:09,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112655226] [2020-08-18 21:14:09,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:14:09,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:14:09,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:09,587 INFO L87 Difference]: Start difference. First operand 70 states and 80 transitions. Second operand 13 states. [2020-08-18 21:14:09,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,739 INFO L93 Difference]: Finished difference Result 132 states and 154 transitions. [2020-08-18 21:14:09,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:14:09,739 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 21:14:09,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,741 INFO L225 Difference]: With dead ends: 132 [2020-08-18 21:14:09,741 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 21:14:09,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:09,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 21:14:09,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 76. [2020-08-18 21:14:09,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 21:14:09,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2020-08-18 21:14:09,750 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 36 [2020-08-18 21:14:09,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,751 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2020-08-18 21:14:09,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:14:09,751 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2020-08-18 21:14:09,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:14:09,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,752 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:14:09,752 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1818054536, now seen corresponding path program 7 times [2020-08-18 21:14:09,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576913315] [2020-08-18 21:14:09,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,937 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:09,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576913315] [2020-08-18 21:14:09,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 21:14:09,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387572557] [2020-08-18 21:14:09,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 21:14:09,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 21:14:09,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:09,941 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand 14 states. [2020-08-18 21:14:10,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,100 INFO L93 Difference]: Finished difference Result 143 states and 167 transitions. [2020-08-18 21:14:10,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 21:14:10,100 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-18 21:14:10,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,101 INFO L225 Difference]: With dead ends: 143 [2020-08-18 21:14:10,102 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 21:14:10,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:10,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 21:14:10,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 82. [2020-08-18 21:14:10,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 21:14:10,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2020-08-18 21:14:10,118 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 38 [2020-08-18 21:14:10,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,118 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2020-08-18 21:14:10,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 21:14:10,119 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2020-08-18 21:14:10,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:14:10,119 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,123 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:14:10,124 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1390315882, now seen corresponding path program 8 times [2020-08-18 21:14:10,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866912303] [2020-08-18 21:14:10,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,288 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:14:10,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866912303] [2020-08-18 21:14:10,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:14:10,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053007663] [2020-08-18 21:14:10,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:14:10,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:14:10,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:10,290 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand 15 states. [2020-08-18 21:14:10,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,484 INFO L93 Difference]: Finished difference Result 154 states and 180 transitions. [2020-08-18 21:14:10,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:14:10,485 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-18 21:14:10,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,486 INFO L225 Difference]: With dead ends: 154 [2020-08-18 21:14:10,487 INFO L226 Difference]: Without dead ends: 101 [2020-08-18 21:14:10,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:10,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-18 21:14:10,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2020-08-18 21:14:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 21:14:10,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2020-08-18 21:14:10,495 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 40 [2020-08-18 21:14:10,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,496 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2020-08-18 21:14:10,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:14:10,496 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2020-08-18 21:14:10,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 21:14:10,497 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,497 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:14:10,497 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1644637492, now seen corresponding path program 9 times [2020-08-18 21:14:10,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136566450] [2020-08-18 21:14:10,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-08-18 21:14:10,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136566450] [2020-08-18 21:14:10,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:14:10,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380918627] [2020-08-18 21:14:10,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:10,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:10,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:10,594 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand 7 states. [2020-08-18 21:14:10,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,694 INFO L93 Difference]: Finished difference Result 93 states and 105 transitions. [2020-08-18 21:14:10,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:10,695 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2020-08-18 21:14:10,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,696 INFO L225 Difference]: With dead ends: 93 [2020-08-18 21:14:10,696 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 21:14:10,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:10,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 21:14:10,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 21:14:10,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 21:14:10,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 100 transitions. [2020-08-18 21:14:10,702 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 100 transitions. Word has length 42 [2020-08-18 21:14:10,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,702 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 100 transitions. [2020-08-18 21:14:10,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:10,702 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 100 transitions. [2020-08-18 21:14:10,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 21:14:10,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,703 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:14:10,704 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1325635667, now seen corresponding path program 10 times [2020-08-18 21:14:10,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162572413] [2020-08-18 21:14:10,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,778 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-08-18 21:14:10,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162572413] [2020-08-18 21:14:10,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:10,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-18 21:14:10,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448798618] [2020-08-18 21:14:10,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:10,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:10,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:10,780 INFO L87 Difference]: Start difference. First operand 88 states and 100 transitions. Second operand 7 states. [2020-08-18 21:14:10,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,847 INFO L93 Difference]: Finished difference Result 88 states and 100 transitions. [2020-08-18 21:14:10,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:10,848 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 46 [2020-08-18 21:14:10,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,848 INFO L225 Difference]: With dead ends: 88 [2020-08-18 21:14:10,849 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 21:14:10,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:10,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 21:14:10,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 21:14:10,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 21:14:10,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 21:14:10,850 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 46 [2020-08-18 21:14:10,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,850 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 21:14:10,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:10,851 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 21:14:10,851 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 21:14:10,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:14:10,853 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 21:14:10,910 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-18 21:14:10,911 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-18 21:14:10,911 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 21:14:10,911 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 21:14:10,911 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 21:14:10,911 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 21:14:10,912 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 21:14:10,912 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 23) no Hoare annotation was computed. [2020-08-18 21:14:10,912 INFO L268 CegarLoopResult]: For program point L17-1(lines 17 21) no Hoare annotation was computed. [2020-08-18 21:14:10,912 INFO L268 CegarLoopResult]: For program point L17-3(lines 17 21) no Hoare annotation was computed. [2020-08-18 21:14:10,912 INFO L264 CegarLoopResult]: At program point L17-4(lines 17 21) the Hoare annotation is: (<= main_~i~0 1023) [2020-08-18 21:14:10,912 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 9 23) no Hoare annotation was computed. [2020-08-18 21:14:10,913 INFO L264 CegarLoopResult]: At program point L17-5(lines 17 21) the Hoare annotation is: (<= main_~i~0 1023) [2020-08-18 21:14:10,913 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-08-18 21:14:10,913 INFO L271 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: true [2020-08-18 21:14:10,913 INFO L268 CegarLoopResult]: For program point L13-4(lines 13 15) no Hoare annotation was computed. [2020-08-18 21:14:10,913 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 9 23) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-18 21:14:10,913 INFO L268 CegarLoopResult]: For program point L22(line 22) no Hoare annotation was computed. [2020-08-18 21:14:10,913 INFO L268 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-08-18 21:14:10,913 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-18 21:14:10,914 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-18 21:14:10,914 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-18 21:14:10,914 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-18 21:14:10,914 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-18 21:14:10,914 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-18 21:14:10,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 09:14:10 BoogieIcfgContainer [2020-08-18 21:14:10,932 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 21:14:10,935 INFO L168 Benchmark]: Toolchain (without parser) took 5090.54 ms. Allocated memory was 146.8 MB in the beginning and 281.5 MB in the end (delta: 134.7 MB). Free memory was 102.7 MB in the beginning and 227.4 MB in the end (delta: -124.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,936 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,937 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.09 ms. Allocated memory is still 146.8 MB. Free memory was 102.5 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,938 INFO L168 Benchmark]: Boogie Preprocessor took 129.82 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.7 MB in the beginning and 180.7 MB in the end (delta: -88.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,939 INFO L168 Benchmark]: RCFGBuilder took 272.79 ms. Allocated memory is still 202.4 MB. Free memory was 180.0 MB in the beginning and 165.8 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,939 INFO L168 Benchmark]: TraceAbstraction took 4440.06 ms. Allocated memory was 202.4 MB in the beginning and 281.5 MB in the end (delta: 79.2 MB). Free memory was 165.1 MB in the beginning and 227.4 MB in the end (delta: -62.2 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2020-08-18 21:14:10,943 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.09 ms. Allocated memory is still 146.8 MB. Free memory was 102.5 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.82 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.7 MB in the beginning and 180.7 MB in the end (delta: -88.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 272.79 ms. Allocated memory is still 202.4 MB. Free memory was 180.0 MB in the beginning and 165.8 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4440.06 ms. Allocated memory was 202.4 MB in the beginning and 281.5 MB in the end (delta: 79.2 MB). Free memory was 165.1 MB in the beginning and 227.4 MB in the end (delta: -62.2 MB). Peak memory consumption was 16.9 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: 17]: Loop Invariant Derived loop invariant: i <= 1023 - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.3s, OverallIterations: 16, TraceHistogramMax: 12, AutomataDifference: 1.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 214 SDtfs, 505 SDslu, 593 SDs, 0 SdLazy, 1177 SolverSat, 232 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 159 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=88occurred in iteration=14, 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, 16 MinimizatonAttempts, 94 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 23 PreInvPairs, 51 NumberOfFragments, 23 HoareAnnotationTreeSize, 23 FomulaSimplifications, 77 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 39 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 455 NumberOfCodeBlocks, 455 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 439 ConstructedInterpolants, 0 QuantifiedInterpolants, 28428 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 16 InterpolantComputations, 4 PerfectInterpolantSequences, 328/836 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...