/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=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:52:41,308 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:52:41,311 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:52:41,336 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:52:41,336 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:52:41,337 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:52:41,339 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:52:41,340 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:52:41,342 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:52:41,343 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:52:41,344 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:52:41,345 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:52:41,346 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:52:41,347 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:52:41,348 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:52:41,349 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:52:41,350 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:52:41,351 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:52:41,353 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:52:41,355 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:52:41,356 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:52:41,357 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:52:41,358 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:52:41,359 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:52:41,362 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 21:52:41,362 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 21:52:41,362 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 21:52:41,363 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 21:52:41,364 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 21:52:41,365 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 21:52:41,365 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 21:52:41,366 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 21:52:41,366 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 21:52:41,367 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 21:52:41,368 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 21:52:41,369 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 21:52:41,369 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 21:52:41,370 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 21:52:41,370 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:52:41,371 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:52:41,371 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:52:41,372 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 21:52:41,396 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:52:41,396 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:52:41,400 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:52:41,401 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:52:41,401 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:52:41,401 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:52:41,401 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:52:41,401 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:52:41,402 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:52:41,402 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:52:41,402 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:52:41,402 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:52:41,402 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:52:41,403 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:52:41,403 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:52:41,403 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:52:41,403 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:52:41,404 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:52:41,407 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:52:41,407 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:52:41,407 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:52:41,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:52:41,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:52:41,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:52:41,408 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:52:41,409 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:52:41,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:52:41,412 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:52:41,412 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:52:41,412 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=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 21:52:41,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:52:41,756 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:52:41,760 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:52:41,762 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:52:41,764 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:52:41,765 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-18 21:52:41,830 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7bdb51d55/ea9b8bd926df4a3eb2c7000fbe68fd9f/FLAG76ed794ec [2020-08-18 21:52:42,285 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:52:42,286 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-18 21:52:42,295 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7bdb51d55/ea9b8bd926df4a3eb2c7000fbe68fd9f/FLAG76ed794ec [2020-08-18 21:52:42,612 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7bdb51d55/ea9b8bd926df4a3eb2c7000fbe68fd9f [2020-08-18 21:52:42,621 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:52:42,622 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:52:42,623 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:52:42,624 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:52:42,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:52:42,629 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a3fa750 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42, skipping insertion in model container [2020-08-18 21:52:42,632 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,640 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:52:42,658 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:52:42,822 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:52:42,827 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:52:42,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:52:42,854 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:52:42,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42 WrapperNode [2020-08-18 21:52:42,854 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:52:42,855 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:52:42,855 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:52:42,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:52:42,866 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,866 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,871 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,956 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,962 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (1/1) ... [2020-08-18 21:52:42,963 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:52:42,967 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:52:42,967 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:52:42,968 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:52:42,968 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (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 21:52:43,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:52:43,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:52:43,038 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-18 21:52:43,038 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:52:43,039 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:52:43,220 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:52:43,220 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 21:52:43,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:52:43 BoogieIcfgContainer [2020-08-18 21:52:43,225 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:52:43,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:52:43,226 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:52:43,230 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:52:43,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:52:42" (1/3) ... [2020-08-18 21:52:43,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5ad468 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:52:43, skipping insertion in model container [2020-08-18 21:52:43,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:52:42" (2/3) ... [2020-08-18 21:52:43,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5ad468 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:52:43, skipping insertion in model container [2020-08-18 21:52:43,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:52:43" (3/3) ... [2020-08-18 21:52:43,234 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-08-18 21:52:43,246 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:52:43,255 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:52:43,271 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:52:43,323 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:52:43,324 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:52:43,324 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:52:43,324 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:52:43,324 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:52:43,325 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:52:43,325 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:52:43,325 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:52:43,358 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-18 21:52:43,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:52:43,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:43,369 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:52:43,370 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:43,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:43,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-08-18 21:52:43,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:43,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327397087] [2020-08-18 21:52:43,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:43,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:43,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:43,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,634 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 21:52:43,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327397087] [2020-08-18 21:52:43,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:52:43,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:52:43,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066160902] [2020-08-18 21:52:43,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:52:43,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:43,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:52:43,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:52:43,667 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-08-18 21:52:43,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:43,784 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-18 21:52:43,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:52:43,787 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 21:52:43,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:43,801 INFO L225 Difference]: With dead ends: 35 [2020-08-18 21:52:43,801 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 21:52:43,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:52:43,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 21:52:43,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 21:52:43,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:52:43,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-18 21:52:43,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-18 21:52:43,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:43,858 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-18 21:52:43,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:52:43,858 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-18 21:52:43,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 21:52:43,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:43,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:52:43,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:52:43,862 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:43,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:43,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-08-18 21:52:43,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:43,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346315111] [2020-08-18 21:52:43,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:43,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:43,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:43,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:43,950 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 21:52:43,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346315111] [2020-08-18 21:52:43,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:52:43,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:52:43,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601847189] [2020-08-18 21:52:43,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:52:43,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:43,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:52:43,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:52:43,957 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-18 21:52:44,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:44,051 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 21:52:44,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:52:44,053 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 21:52:44,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:44,055 INFO L225 Difference]: With dead ends: 27 [2020-08-18 21:52:44,055 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 21:52:44,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:52:44,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 21:52:44,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-18 21:52:44,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:52:44,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-18 21:52:44,065 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-18 21:52:44,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:44,066 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-18 21:52:44,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:52:44,066 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-18 21:52:44,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:52:44,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:44,068 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] [2020-08-18 21:52:44,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:52:44,068 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:44,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:44,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-08-18 21:52:44,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:44,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546710561] [2020-08-18 21:52:44,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:44,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:44,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:44,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:44,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-18 21:52:44,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,198 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-18 21:52:44,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546710561] [2020-08-18 21:52:44,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:44,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:52:44,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504777874] [2020-08-18 21:52:44,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:52:44,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:44,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:52:44,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:52:44,201 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-08-18 21:52:44,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:44,292 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-18 21:52:44,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:52:44,293 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-08-18 21:52:44,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:44,295 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:52:44,295 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 21:52:44,296 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 [2020-08-18 21:52:44,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 21:52:44,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 21:52:44,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:52:44,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-18 21:52:44,304 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-18 21:52:44,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:44,304 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-18 21:52:44,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:52:44,305 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-18 21:52:44,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 21:52:44,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:44,307 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] [2020-08-18 21:52:44,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:52:44,307 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:44,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:44,308 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-08-18 21:52:44,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:44,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491779211] [2020-08-18 21:52:44,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:44,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:44,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:44,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:44,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:44,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,489 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 21:52:44,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491779211] [2020-08-18 21:52:44,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:44,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:52:44,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239329072] [2020-08-18 21:52:44,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:52:44,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:44,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:52:44,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:52:44,492 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-18 21:52:44,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:44,623 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-18 21:52:44,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:52:44,624 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-18 21:52:44,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:44,627 INFO L225 Difference]: With dead ends: 41 [2020-08-18 21:52:44,627 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 21:52:44,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:52:44,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 21:52:44,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 21:52:44,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:52:44,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-18 21:52:44,640 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-18 21:52:44,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:44,640 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-18 21:52:44,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:52:44,641 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-18 21:52:44,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:52:44,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:44,643 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] [2020-08-18 21:52:44,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:52:44,644 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:44,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:44,644 INFO L82 PathProgramCache]: Analyzing trace with hash -111055954, now seen corresponding path program 2 times [2020-08-18 21:52:44,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:44,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446226922] [2020-08-18 21:52:44,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:44,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:44,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:44,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:44,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:44,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:44,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,793 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-18 21:52:44,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446226922] [2020-08-18 21:52:44,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:44,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:52:44,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664839724] [2020-08-18 21:52:44,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:52:44,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:44,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:52:44,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:52:44,799 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 7 states. [2020-08-18 21:52:44,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:44,938 INFO L93 Difference]: Finished difference Result 76 states and 119 transitions. [2020-08-18 21:52:44,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:52:44,939 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-08-18 21:52:44,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:44,941 INFO L225 Difference]: With dead ends: 76 [2020-08-18 21:52:44,942 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 21:52:44,943 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 [2020-08-18 21:52:44,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 21:52:44,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-08-18 21:52:44,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:52:44,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2020-08-18 21:52:44,955 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 40 [2020-08-18 21:52:44,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:44,956 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2020-08-18 21:52:44,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:52:44,956 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2020-08-18 21:52:44,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 21:52:44,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:44,958 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] [2020-08-18 21:52:44,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:52:44,959 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:44,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:44,959 INFO L82 PathProgramCache]: Analyzing trace with hash 380905728, now seen corresponding path program 3 times [2020-08-18 21:52:44,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:44,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036370868] [2020-08-18 21:52:44,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:44,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:44,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:44,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:45,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:45,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:45,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,125 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-18 21:52:45,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036370868] [2020-08-18 21:52:45,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:45,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:52:45,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646909626] [2020-08-18 21:52:45,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:52:45,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:45,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:52:45,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:52:45,128 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand 7 states. [2020-08-18 21:52:45,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:45,266 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2020-08-18 21:52:45,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:52:45,267 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-18 21:52:45,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:45,269 INFO L225 Difference]: With dead ends: 62 [2020-08-18 21:52:45,269 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 21:52:45,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:52:45,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 21:52:45,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2020-08-18 21:52:45,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 21:52:45,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 81 transitions. [2020-08-18 21:52:45,284 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 81 transitions. Word has length 41 [2020-08-18 21:52:45,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:45,285 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 81 transitions. [2020-08-18 21:52:45,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:52:45,285 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 81 transitions. [2020-08-18 21:52:45,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 21:52:45,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:45,289 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:52:45,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:52:45,290 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:45,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:45,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 4 times [2020-08-18 21:52:45,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:45,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232004411] [2020-08-18 21:52:45,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:45,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:45,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:45,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:45,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 21:52:45,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:45,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:45,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,513 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-08-18 21:52:45,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232004411] [2020-08-18 21:52:45,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:45,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:52:45,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757232912] [2020-08-18 21:52:45,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:52:45,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:45,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:52:45,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:52:45,517 INFO L87 Difference]: Start difference. First operand 55 states and 81 transitions. Second operand 8 states. [2020-08-18 21:52:45,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:45,694 INFO L93 Difference]: Finished difference Result 97 states and 150 transitions. [2020-08-18 21:52:45,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:52:45,695 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 82 [2020-08-18 21:52:45,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:45,699 INFO L225 Difference]: With dead ends: 97 [2020-08-18 21:52:45,699 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 21:52:45,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:52:45,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 21:52:45,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-08-18 21:52:45,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 21:52:45,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 137 transitions. [2020-08-18 21:52:45,719 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 137 transitions. Word has length 82 [2020-08-18 21:52:45,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:45,720 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 137 transitions. [2020-08-18 21:52:45,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:52:45,720 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 137 transitions. [2020-08-18 21:52:45,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-08-18 21:52:45,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:45,728 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:52:45,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:52:45,728 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:45,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:45,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-08-18 21:52:45,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:45,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465479817] [2020-08-18 21:52:45,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:45,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:52:45,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:52:45,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:45,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:45,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 21:52:45,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:45,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:45,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-18 21:52:46,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:46,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:46,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:46,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:46,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:46,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:52:46,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 21:52:46,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 21:52:46,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:52:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-18 21:52:46,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:52:46,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 381 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2020-08-18 21:52:46,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465479817] [2020-08-18 21:52:46,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:52:46,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:52:46,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172505177] [2020-08-18 21:52:46,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:52:46,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:52:46,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:52:46,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:52:46,233 INFO L87 Difference]: Start difference. First operand 87 states and 137 transitions. Second operand 12 states. [2020-08-18 21:52:46,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:52:46,634 INFO L93 Difference]: Finished difference Result 153 states and 266 transitions. [2020-08-18 21:52:46,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:52:46,635 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 150 [2020-08-18 21:52:46,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:52:46,637 INFO L225 Difference]: With dead ends: 153 [2020-08-18 21:52:46,637 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 21:52:46,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=177, Invalid=525, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:52:46,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 21:52:46,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-08-18 21:52:46,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 21:52:46,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2020-08-18 21:52:46,650 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 150 [2020-08-18 21:52:46,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:52:46,651 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2020-08-18 21:52:46,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:52:46,651 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2020-08-18 21:52:46,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-18 21:52:46,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:52:46,653 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:52:46,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:52:46,653 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:52:46,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:52:46,654 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-08-18 21:52:46,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:52:46,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279184353] [2020-08-18 21:52:46,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:52:46,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 21:52:46,676 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 21:52:46,676 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 21:52:46,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:52:46,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 09:52:46 BoogieIcfgContainer [2020-08-18 21:52:46,712 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 21:52:46,717 INFO L168 Benchmark]: Toolchain (without parser) took 4091.33 ms. Allocated memory was 138.9 MB in the beginning and 249.6 MB in the end (delta: 110.6 MB). Free memory was 102.4 MB in the beginning and 125.1 MB in the end (delta: -22.6 MB). Peak memory consumption was 88.0 MB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,718 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,719 INFO L168 Benchmark]: CACSL2BoogieTranslator took 231.24 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 93.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,720 INFO L168 Benchmark]: Boogie Preprocessor took 108.59 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.0 MB in the beginning and 181.4 MB in the end (delta: -88.5 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,720 INFO L168 Benchmark]: RCFGBuilder took 257.52 ms. Allocated memory is still 202.4 MB. Free memory was 181.0 MB in the beginning and 168.8 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,721 INFO L168 Benchmark]: TraceAbstraction took 3485.79 ms. Allocated memory was 202.4 MB in the beginning and 249.6 MB in the end (delta: 47.2 MB). Free memory was 168.8 MB in the beginning and 125.1 MB in the end (delta: 43.8 MB). Peak memory consumption was 90.9 MB. Max. memory is 7.1 GB. [2020-08-18 21:52:46,726 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 231.24 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 93.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 108.59 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.0 MB in the beginning and 181.4 MB in the end (delta: -88.5 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 257.52 ms. Allocated memory is still 202.4 MB. Free memory was 181.0 MB in the beginning and 168.8 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3485.79 ms. Allocated memory was 202.4 MB in the beginning and 249.6 MB in the end (delta: 47.2 MB). Free memory was 168.8 MB in the beginning and 125.1 MB in the end (delta: 43.8 MB). Peak memory consumption was 90.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) [L33] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.3s, OverallIterations: 9, TraceHistogramMax: 21, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 161 SDslu, 354 SDs, 0 SdLazy, 510 SolverSat, 127 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 208 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=87occurred in iteration=7, 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, 8 MinimizatonAttempts, 27 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 502 NumberOfCodeBlocks, 502 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 385 ConstructedInterpolants, 0 QuantifiedInterpolants, 61017 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 1026/1574 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...