/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:17:27,431 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:17:27,436 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:17:27,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:17:27,481 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:17:27,489 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:17:27,493 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:17:27,497 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:17:27,500 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:17:27,503 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:17:27,504 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:17:27,505 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:17:27,505 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:17:27,508 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:17:27,511 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:17:27,513 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:17:27,515 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:17:27,517 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:17:27,519 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:17:27,530 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:17:27,533 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:17:27,535 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:17:27,536 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:17:27,537 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:17:27,550 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:17:27,571 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:17:27,573 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:17:27,574 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:17:27,575 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 [2020-09-21 10:17:27,622 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:17:27,622 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:17:27,625 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:17:27,625 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:17:27,625 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:17:27,625 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:17:27,626 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:17:27,626 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:17:27,626 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:17:27,626 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:17:27,628 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:17:27,628 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:17:27,628 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:17:27,629 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:17:27,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:17:27,629 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:17:27,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:17:27,630 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:17:27,630 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:17:27,630 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:17:27,631 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:17:27,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:17:27,631 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:17:27,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:17:27,632 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:17:27,632 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:17:27,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:17:27,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:17:27,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:17:27,633 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:17:28,101 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:17:28,129 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:17:28,136 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:17:28,138 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:17:28,139 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:17:28,140 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-09-21 10:17:28,242 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2bc32e1d/aa2dfd91bf5e4f2b8efa1ea080636f90/FLAGab1b0af8e [2020-09-21 10:17:28,825 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:17:28,826 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-09-21 10:17:28,835 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2bc32e1d/aa2dfd91bf5e4f2b8efa1ea080636f90/FLAGab1b0af8e [2020-09-21 10:17:29,137 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2bc32e1d/aa2dfd91bf5e4f2b8efa1ea080636f90 [2020-09-21 10:17:29,149 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:17:29,155 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:17:29,157 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:17:29,157 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:17:29,161 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:17:29,163 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,167 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1573d552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29, skipping insertion in model container [2020-09-21 10:17:29,167 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,177 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:17:29,199 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:17:29,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:17:29,422 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:17:29,441 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:17:29,457 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:17:29,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29 WrapperNode [2020-09-21 10:17:29,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:17:29,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:17:29,459 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:17:29,459 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:17:29,473 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,474 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,563 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,566 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... [2020-09-21 10:17:29,568 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:17:29,569 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:17:29,569 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:17:29,569 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:17:29,570 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:17:29,652 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:17:29,653 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:17:29,653 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-09-21 10:17:29,653 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:17:29,653 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:17:29,653 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:17:29,654 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-09-21 10:17:29,654 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:17:29,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:17:29,654 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:17:29,875 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:17:29,876 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-21 10:17:29,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:17:29 BoogieIcfgContainer [2020-09-21 10:17:29,882 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:17:29,883 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:17:29,883 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:17:29,888 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:17:29,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:17:29" (1/3) ... [2020-09-21 10:17:29,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50e079e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:17:29, skipping insertion in model container [2020-09-21 10:17:29,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:29" (2/3) ... [2020-09-21 10:17:29,891 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50e079e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:17:29, skipping insertion in model container [2020-09-21 10:17:29,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:17:29" (3/3) ... [2020-09-21 10:17:29,893 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-09-21 10:17:29,908 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:17:29,921 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:17:29,953 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:17:29,991 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:17:29,991 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:17:29,991 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:17:29,992 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:17:29,992 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:17:29,992 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:17:29,992 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:17:29,992 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:17:30,018 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-09-21 10:17:30,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 10:17:30,028 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:30,029 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:30,030 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:30,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:30,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-09-21 10:17:30,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:30,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751314700] [2020-09-21 10:17:30,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:30,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:30,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:30,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:17:30,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751314700] [2020-09-21 10:17:30,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:17:30,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:17:30,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972114309] [2020-09-21 10:17:30,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:17:30,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:30,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:17:30,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:17:30,361 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-09-21 10:17:30,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:30,543 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-09-21 10:17:30,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:17:30,546 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-09-21 10:17:30,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:30,560 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:17:30,560 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:17:30,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:17:30,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:17:30,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-09-21 10:17:30,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-21 10:17:30,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-09-21 10:17:30,632 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-09-21 10:17:30,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:30,633 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-09-21 10:17:30,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:17:30,634 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-09-21 10:17:30,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:17:30,636 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:30,637 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:30,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:17:30,637 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:30,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:30,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-09-21 10:17:30,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:30,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554311413] [2020-09-21 10:17:30,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:30,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:30,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:30,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:30,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:17:30,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,772 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-21 10:17:30,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554311413] [2020-09-21 10:17:30,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:30,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:17:30,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164470530] [2020-09-21 10:17:30,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:17:30,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:30,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:17:30,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:17:30,783 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-09-21 10:17:30,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:30,893 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-09-21 10:17:30,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:17:30,894 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-09-21 10:17:30,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:30,896 INFO L225 Difference]: With dead ends: 39 [2020-09-21 10:17:30,896 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:17:30,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:17:30,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:17:30,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-21 10:17:30,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 10:17:30,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-09-21 10:17:30,907 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2020-09-21 10:17:30,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:30,907 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-09-21 10:17:30,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:17:30,907 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-09-21 10:17:30,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:17:30,909 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:30,910 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:30,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:17:30,910 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:30,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:30,911 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-09-21 10:17:30,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:30,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123690682] [2020-09-21 10:17:30,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:30,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:30,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:30,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:31,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:31,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,206 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:17:31,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123690682] [2020-09-21 10:17:31,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:31,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:17:31,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958801341] [2020-09-21 10:17:31,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:17:31,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:31,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:17:31,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:17:31,210 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 10 states. [2020-09-21 10:17:31,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:31,437 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-09-21 10:17:31,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:17:31,438 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-21 10:17:31,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:31,440 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:17:31,440 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:17:31,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:17:31,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:17:31,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:17:31,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:17:31,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2020-09-21 10:17:31,451 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2020-09-21 10:17:31,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:31,452 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2020-09-21 10:17:31,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:17:31,452 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2020-09-21 10:17:31,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:17:31,454 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:31,454 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:31,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:17:31,455 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:31,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:31,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1293014720, now seen corresponding path program 2 times [2020-09-21 10:17:31,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:31,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088529629] [2020-09-21 10:17:31,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:31,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:31,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:31,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:31,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:31,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:31,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,627 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-09-21 10:17:31,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088529629] [2020-09-21 10:17:31,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:31,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:17:31,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739176931] [2020-09-21 10:17:31,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:17:31,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:31,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:17:31,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:17:31,631 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 6 states. [2020-09-21 10:17:31,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:31,757 INFO L93 Difference]: Finished difference Result 54 states and 78 transitions. [2020-09-21 10:17:31,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:17:31,758 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2020-09-21 10:17:31,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:31,759 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:17:31,760 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:17:31,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:17:31,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:17:31,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-21 10:17:31,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:17:31,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2020-09-21 10:17:31,770 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 42 [2020-09-21 10:17:31,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:31,770 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2020-09-21 10:17:31,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:17:31,770 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2020-09-21 10:17:31,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:17:31,772 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:31,773 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:31,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:17:31,773 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:31,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:31,774 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 3 times [2020-09-21 10:17:31,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:31,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598313209] [2020-09-21 10:17:31,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:31,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:31,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:31,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:31,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:31,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:31,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:31,976 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-09-21 10:17:31,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598313209] [2020-09-21 10:17:31,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:31,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:17:31,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607056565] [2020-09-21 10:17:31,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:17:31,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:31,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:17:31,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:17:31,979 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand 7 states. [2020-09-21 10:17:32,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:32,075 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2020-09-21 10:17:32,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:17:32,076 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-09-21 10:17:32,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:32,078 INFO L225 Difference]: With dead ends: 55 [2020-09-21 10:17:32,078 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:17:32,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:17:32,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:17:32,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-21 10:17:32,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:17:32,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-09-21 10:17:32,087 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 41 [2020-09-21 10:17:32,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:32,088 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-09-21 10:17:32,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:17:32,088 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-09-21 10:17:32,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:17:32,090 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:32,090 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:32,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:17:32,091 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:32,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:32,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 4 times [2020-09-21 10:17:32,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:32,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587529556] [2020-09-21 10:17:32,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:32,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:32,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:32,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:32,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:32,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:32,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,289 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:17:32,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587529556] [2020-09-21 10:17:32,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:32,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:17:32,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195428500] [2020-09-21 10:17:32,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:17:32,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:32,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:17:32,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:17:32,293 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 12 states. [2020-09-21 10:17:32,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:32,553 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-09-21 10:17:32,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:17:32,557 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2020-09-21 10:17:32,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:32,559 INFO L225 Difference]: With dead ends: 41 [2020-09-21 10:17:32,559 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:17:32,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:17:32,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:17:32,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2020-09-21 10:17:32,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:17:32,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-09-21 10:17:32,579 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 42 [2020-09-21 10:17:32,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:32,580 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-09-21 10:17:32,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:17:32,580 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-09-21 10:17:32,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-21 10:17:32,584 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:32,584 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:32,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:17:32,586 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:32,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:32,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1554048393, now seen corresponding path program 5 times [2020-09-21 10:17:32,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:32,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109157464] [2020-09-21 10:17:32,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:32,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:32,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:32,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:32,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:32,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:32,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:32,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:32,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:32,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:32,763 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 33 proven. 35 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2020-09-21 10:17:32,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109157464] [2020-09-21 10:17:32,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:32,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:17:32,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733563946] [2020-09-21 10:17:32,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:17:32,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:32,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:17:32,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:17:32,766 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 8 states. [2020-09-21 10:17:32,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:32,968 INFO L93 Difference]: Finished difference Result 70 states and 99 transitions. [2020-09-21 10:17:32,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:17:32,969 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 55 [2020-09-21 10:17:32,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:32,970 INFO L225 Difference]: With dead ends: 70 [2020-09-21 10:17:32,970 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:17:32,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:17:32,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:17:32,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-09-21 10:17:32,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:17:32,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2020-09-21 10:17:32,981 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 55 [2020-09-21 10:17:32,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:32,981 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2020-09-21 10:17:32,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:17:32,982 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2020-09-21 10:17:32,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-09-21 10:17:32,983 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:32,983 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:32,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:17:32,984 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:32,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:32,984 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 6 times [2020-09-21 10:17:32,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:32,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770706255] [2020-09-21 10:17:32,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:33,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:33,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:33,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:33,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-21 10:17:33,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:33,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:33,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-21 10:17:33,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,268 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 151 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2020-09-21 10:17:33,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770706255] [2020-09-21 10:17:33,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:33,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:17:33,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45502265] [2020-09-21 10:17:33,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:17:33,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:33,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:17:33,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:17:33,271 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand 10 states. [2020-09-21 10:17:33,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:33,582 INFO L93 Difference]: Finished difference Result 92 states and 135 transitions. [2020-09-21 10:17:33,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:17:33,584 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 97 [2020-09-21 10:17:33,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:33,587 INFO L225 Difference]: With dead ends: 92 [2020-09-21 10:17:33,588 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:17:33,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:17:33,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:17:33,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2020-09-21 10:17:33,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:17:33,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2020-09-21 10:17:33,609 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 97 [2020-09-21 10:17:33,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:33,609 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2020-09-21 10:17:33,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:17:33,610 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2020-09-21 10:17:33,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-21 10:17:33,613 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:33,613 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:33,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:17:33,613 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:33,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:33,614 INFO L82 PathProgramCache]: Analyzing trace with hash -865837754, now seen corresponding path program 7 times [2020-09-21 10:17:33,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:33,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718982389] [2020-09-21 10:17:33,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:33,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:33,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:17:33,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:33,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:33,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-21 10:17:33,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:33,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-21 10:17:33,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:33,905 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 8 proven. 98 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-09-21 10:17:33,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718982389] [2020-09-21 10:17:33,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:33,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:17:33,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819581856] [2020-09-21 10:17:33,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:17:33,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:33,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:17:33,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:17:33,909 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand 14 states. [2020-09-21 10:17:34,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:34,125 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2020-09-21 10:17:34,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:17:34,126 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 69 [2020-09-21 10:17:34,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:34,127 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:17:34,127 INFO L226 Difference]: Without dead ends: 0 [2020-09-21 10:17:34,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:17:34,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-21 10:17:34,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-21 10:17:34,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-21 10:17:34,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-21 10:17:34,130 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2020-09-21 10:17:34,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:34,131 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-21 10:17:34,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:17:34,131 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-21 10:17:34,131 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-21 10:17:34,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:17:34,134 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-21 10:17:34,399 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-09-21 10:17:34,399 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-09-21 10:17:34,400 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= fibonacci_~n |fibonacci_#in~n|) (<= 2 |fibonacci_#in~n|)) [2020-09-21 10:17:34,400 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-09-21 10:17:34,400 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (let ((.cse0 (= fibonacci_~n |fibonacci_#in~n|))) (or (and (<= |fibonacci_#in~n| 2) (<= 1 |fibonacci_#t~ret0|) .cse0 (<= 2 |fibonacci_#in~n|)) (and (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 2)) .cse0 (<= 3 |fibonacci_#in~n|)))) [2020-09-21 10:17:34,400 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-09-21 10:17:34,400 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-09-21 10:17:34,400 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-09-21 10:17:34,401 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-09-21 10:17:34,401 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-21 10:17:34,401 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:17:34,401 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:17:34,401 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-21 10:17:34,401 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-21 10:17:34,401 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-09-21 10:17:34,402 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-09-21 10:17:34,402 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-09-21 10:17:34,402 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-09-21 10:17:34,402 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-09-21 10:17:34,402 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-09-21 10:17:34,402 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-09-21 10:17:34,402 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-09-21 10:17:34,403 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-09-21 10:17:34,403 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-09-21 10:17:34,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:17:34 BoogieIcfgContainer [2020-09-21 10:17:34,410 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:17:34,413 INFO L168 Benchmark]: Toolchain (without parser) took 5261.08 ms. Allocated memory was 138.9 MB in the beginning and 286.8 MB in the end (delta: 147.8 MB). Free memory was 102.2 MB in the beginning and 238.6 MB in the end (delta: -136.4 MB). Peak memory consumption was 116.0 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:34,414 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 10:17:34,415 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.64 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 91.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:34,416 INFO L168 Benchmark]: Boogie Preprocessor took 109.56 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 91.8 MB in the beginning and 181.5 MB in the end (delta: -89.7 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:34,416 INFO L168 Benchmark]: RCFGBuilder took 313.32 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 168.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:34,417 INFO L168 Benchmark]: TraceAbstraction took 4527.05 ms. Allocated memory was 202.4 MB in the beginning and 286.8 MB in the end (delta: 84.4 MB). Free memory was 168.2 MB in the beginning and 238.6 MB in the end (delta: -70.4 MB). Peak memory consumption was 118.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:34,421 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 301.64 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 91.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.56 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 91.8 MB in the beginning and 181.5 MB in the end (delta: -89.7 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 313.32 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 168.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4527.05 ms. Allocated memory was 202.4 MB in the beginning and 286.8 MB in the end (delta: 84.4 MB). Free memory was 168.2 MB in the beginning and 238.6 MB in the end (delta: -70.4 MB). Peak memory consumption was 118.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.1s, OverallIterations: 9, TraceHistogramMax: 13, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 158 SDtfs, 139 SDslu, 543 SDs, 0 SdLazy, 728 SolverSat, 137 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 263 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred in iteration=8, 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, 9 MinimizatonAttempts, 14 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 80 PreInvPairs, 99 NumberOfFragments, 39 HoareAnnotationTreeSize, 80 FomulaSimplifications, 291 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 8 FomulaSimplificationsInter, 215 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 415 NumberOfCodeBlocks, 415 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 406 ConstructedInterpolants, 0 QuantifiedInterpolants, 50421 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 550/894 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...