/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:41:32,181 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 15:41:32,222 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:41:32,231 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:41:32,233 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:41:32,237 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:41:32,239 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:41:32,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:41:32,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:41:32,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:41:32,246 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:41:32,249 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:41:32,251 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:41:32,253 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:41:32,254 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:41:32,255 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:41:32,257 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:41:32,258 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:41:32,260 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:41:32,261 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:41:32,262 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:41:32,263 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:41:32,265 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:41:32,273 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:41:32,274 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:41:32,274 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:41:32,275 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:41:32,298 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:41:32,299 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:41:32,300 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:41:32,300 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:41:32,301 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:41:32,301 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:41:32,301 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:41:32,301 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:41:32,301 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:41:32,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:41:32,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:41:32,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:41:32,302 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:41:32,302 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:41:32,303 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:41:32,303 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:41:32,303 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:41:32,303 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:41:32,303 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:41:32,304 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:41:32,304 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:41:32,304 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:41:32,304 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:41:32,305 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:41:32,305 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:41:32,305 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:41:32,305 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:41:32,305 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:41:32,306 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:41:32,306 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:41:32,599 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:41:32,617 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:41:32,621 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:41:32,622 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:41:32,623 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:41:32,624 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 15:41:32,697 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7efa6cc79/f87a28d2a0414bcdb4268c328fc6b5ab/FLAGf0f6be093 [2020-08-21 15:41:33,170 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:41:33,171 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 15:41:33,178 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7efa6cc79/f87a28d2a0414bcdb4268c328fc6b5ab/FLAGf0f6be093 [2020-08-21 15:41:33,549 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7efa6cc79/f87a28d2a0414bcdb4268c328fc6b5ab [2020-08-21 15:41:33,560 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:41:33,562 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:41:33,563 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:41:33,564 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:41:33,568 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:41:33,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,573 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ad15a05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33, skipping insertion in model container [2020-08-21 15:41:33,573 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,582 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:41:33,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:41:33,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:41:33,805 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:41:33,827 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:41:33,844 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:41:33,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33 WrapperNode [2020-08-21 15:41:33,845 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:41:33,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:41:33,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:41:33,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:41:33,858 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,858 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,863 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,864 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,950 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,954 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,955 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... [2020-08-21 15:41:33,958 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:41:33,959 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:41:33,959 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:41:33,959 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:41:33,960 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:41:34,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:41:34,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:41:34,023 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-21 15:41:34,023 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:41:34,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:41:34,209 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:41:34,209 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 15:41:34,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:41:34 BoogieIcfgContainer [2020-08-21 15:41:34,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:41:34,214 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:41:34,214 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:41:34,218 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:41:34,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:41:33" (1/3) ... [2020-08-21 15:41:34,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@289f063 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:41:34, skipping insertion in model container [2020-08-21 15:41:34,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:41:33" (2/3) ... [2020-08-21 15:41:34,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@289f063 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:41:34, skipping insertion in model container [2020-08-21 15:41:34,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:41:34" (3/3) ... [2020-08-21 15:41:34,221 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-08-21 15:41:34,232 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:41:34,240 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:41:34,255 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:41:34,280 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:41:34,280 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:41:34,280 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:41:34,280 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:41:34,281 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:41:34,281 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:41:34,281 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:41:34,281 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:41:34,303 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-21 15:41:34,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 15:41:34,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:34,311 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:41:34,312 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:34,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:34,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-08-21 15:41:34,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:34,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48331228] [2020-08-21 15:41:34,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:34,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:34,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:34,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:41:34,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48331228] [2020-08-21 15:41:34,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:41:34,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:41:34,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507745059] [2020-08-21 15:41:34,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:41:34,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:34,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:41:34,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:41:34,644 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-08-21 15:41:34,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:34,759 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-21 15:41:34,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:41:34,761 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 15:41:34,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:34,775 INFO L225 Difference]: With dead ends: 35 [2020-08-21 15:41:34,778 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 15:41:34,783 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 [2020-08-21 15:41:34,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 15:41:34,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 15:41:34,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 15:41:34,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 15:41:34,827 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-21 15:41:34,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:34,827 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 15:41:34,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:41:34,828 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 15:41:34,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 15:41:34,829 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:34,829 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:41:34,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:41:34,830 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:34,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:34,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-08-21 15:41:34,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:34,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966334850] [2020-08-21 15:41:34,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:34,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:34,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:34,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:41:34,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966334850] [2020-08-21 15:41:34,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:41:34,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:41:34,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171013714] [2020-08-21 15:41:34,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:41:34,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:34,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:41:34,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:41:34,935 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-21 15:41:35,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:35,009 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 15:41:35,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:41:35,010 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 15:41:35,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:35,012 INFO L225 Difference]: With dead ends: 27 [2020-08-21 15:41:35,012 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:41:35,013 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 [2020-08-21 15:41:35,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:41:35,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-21 15:41:35,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 15:41:35,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 15:41:35,022 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-21 15:41:35,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:35,022 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 15:41:35,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:41:35,023 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 15:41:35,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 15:41:35,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:35,025 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] [2020-08-21 15:41:35,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:41:35,025 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:35,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:35,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-08-21 15:41:35,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:35,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147223069] [2020-08-21 15:41:35,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:35,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:35,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:35,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 15:41:35,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,145 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-21 15:41:35,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147223069] [2020-08-21 15:41:35,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:35,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:41:35,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632789306] [2020-08-21 15:41:35,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:41:35,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:35,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:41:35,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:41:35,148 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-08-21 15:41:35,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:35,238 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-21 15:41:35,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:41:35,239 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-08-21 15:41:35,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:35,240 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:41:35,240 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:41:35,241 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 [2020-08-21 15:41:35,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:41:35,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 15:41:35,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 15:41:35,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-21 15:41:35,250 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-21 15:41:35,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:35,250 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-21 15:41:35,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:41:35,251 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-21 15:41:35,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 15:41:35,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:35,253 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] [2020-08-21 15:41:35,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:41:35,253 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:35,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:35,254 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-08-21 15:41:35,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:35,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483600017] [2020-08-21 15:41:35,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:35,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:35,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:35,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:35,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:41:35,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483600017] [2020-08-21 15:41:35,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:35,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:41:35,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097501184] [2020-08-21 15:41:35,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:41:35,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:35,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:41:35,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:41:35,405 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-21 15:41:35,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:35,542 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-21 15:41:35,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:41:35,543 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-21 15:41:35,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:35,545 INFO L225 Difference]: With dead ends: 41 [2020-08-21 15:41:35,546 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 15:41:35,546 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 [2020-08-21 15:41:35,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 15:41:35,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 15:41:35,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:41:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-21 15:41:35,558 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-21 15:41:35,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:35,559 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-21 15:41:35,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:41:35,559 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-21 15:41:35,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:41:35,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:35,561 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] [2020-08-21 15:41:35,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:41:35,562 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:35,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:35,562 INFO L82 PathProgramCache]: Analyzing trace with hash -111055954, now seen corresponding path program 2 times [2020-08-21 15:41:35,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:35,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032361982] [2020-08-21 15:41:35,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:35,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:35,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:35,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:35,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,705 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-21 15:41:35,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032361982] [2020-08-21 15:41:35,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:35,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:41:35,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589736922] [2020-08-21 15:41:35,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:41:35,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:35,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:41:35,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:41:35,708 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 7 states. [2020-08-21 15:41:35,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:35,826 INFO L93 Difference]: Finished difference Result 76 states and 119 transitions. [2020-08-21 15:41:35,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:41:35,827 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-08-21 15:41:35,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:35,829 INFO L225 Difference]: With dead ends: 76 [2020-08-21 15:41:35,829 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 15:41:35,830 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 [2020-08-21 15:41:35,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 15:41:35,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-08-21 15:41:35,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 15:41:35,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2020-08-21 15:41:35,842 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 40 [2020-08-21 15:41:35,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:35,843 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2020-08-21 15:41:35,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:41:35,843 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2020-08-21 15:41:35,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:41:35,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:35,845 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] [2020-08-21 15:41:35,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:41:35,846 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:35,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:35,846 INFO L82 PathProgramCache]: Analyzing trace with hash 380905728, now seen corresponding path program 3 times [2020-08-21 15:41:35,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:35,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563295066] [2020-08-21 15:41:35,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:35,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:35,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:35,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:35,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:35,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:36,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,016 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-21 15:41:36,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563295066] [2020-08-21 15:41:36,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:36,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:41:36,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638928721] [2020-08-21 15:41:36,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:41:36,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:36,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:41:36,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:41:36,022 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand 7 states. [2020-08-21 15:41:36,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:36,175 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2020-08-21 15:41:36,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:41:36,176 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-21 15:41:36,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:36,183 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:41:36,183 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 15:41:36,186 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 [2020-08-21 15:41:36,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 15:41:36,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2020-08-21 15:41:36,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:41:36,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 81 transitions. [2020-08-21 15:41:36,215 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 81 transitions. Word has length 41 [2020-08-21 15:41:36,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:36,218 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 81 transitions. [2020-08-21 15:41:36,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:41:36,219 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 81 transitions. [2020-08-21 15:41:36,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 15:41:36,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:36,227 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] [2020-08-21 15:41:36,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:41:36,227 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:36,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:36,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 4 times [2020-08-21 15:41:36,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:36,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855509875] [2020-08-21 15:41:36,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:36,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:36,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:36,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:36,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:36,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 15:41:36,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:36,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:36,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,437 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-08-21 15:41:36,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855509875] [2020-08-21 15:41:36,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:36,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:41:36,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256114011] [2020-08-21 15:41:36,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:41:36,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:36,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:41:36,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:41:36,441 INFO L87 Difference]: Start difference. First operand 55 states and 81 transitions. Second operand 8 states. [2020-08-21 15:41:36,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:36,605 INFO L93 Difference]: Finished difference Result 97 states and 150 transitions. [2020-08-21 15:41:36,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:41:36,606 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 82 [2020-08-21 15:41:36,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:36,610 INFO L225 Difference]: With dead ends: 97 [2020-08-21 15:41:36,610 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 15:41:36,611 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 [2020-08-21 15:41:36,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 15:41:36,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-08-21 15:41:36,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 15:41:36,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 137 transitions. [2020-08-21 15:41:36,631 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 137 transitions. Word has length 82 [2020-08-21 15:41:36,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:36,632 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 137 transitions. [2020-08-21 15:41:36,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:41:36,632 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 137 transitions. [2020-08-21 15:41:36,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-08-21 15:41:36,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:36,636 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] [2020-08-21 15:41:36,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:41:36,637 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:36,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:36,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-08-21 15:41:36,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:36,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [234117266] [2020-08-21 15:41:36,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:36,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:41:36,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 15:41:36,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:36,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:36,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 15:41:36,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:36,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 15:41:36,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:36,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:36,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:37,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:37,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:37,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:37,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 15:41:37,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 15:41:37,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 15:41:37,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 15:41:37,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 15:41:37,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:41:37,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 381 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2020-08-21 15:41:37,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [234117266] [2020-08-21 15:41:37,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:41:37,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:41:37,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058183032] [2020-08-21 15:41:37,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:41:37,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:41:37,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:41:37,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:41:37,177 INFO L87 Difference]: Start difference. First operand 87 states and 137 transitions. Second operand 12 states. [2020-08-21 15:41:37,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:41:37,549 INFO L93 Difference]: Finished difference Result 153 states and 266 transitions. [2020-08-21 15:41:37,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:41:37,550 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 150 [2020-08-21 15:41:37,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:41:37,552 INFO L225 Difference]: With dead ends: 153 [2020-08-21 15:41:37,552 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 15:41:37,555 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 [2020-08-21 15:41:37,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 15:41:37,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-08-21 15:41:37,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 15:41:37,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2020-08-21 15:41:37,565 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 150 [2020-08-21 15:41:37,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:41:37,566 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2020-08-21 15:41:37,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:41:37,566 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2020-08-21 15:41:37,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 15:41:37,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:41:37,568 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] [2020-08-21 15:41:37,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:41:37,569 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:41:37,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:41:37,569 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-08-21 15:41:37,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:41:37,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919370612] [2020-08-21 15:41:37,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:41:37,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 15:41:37,589 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 15:41:37,590 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 15:41:37,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:41:37,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 03:41:37 BoogieIcfgContainer [2020-08-21 15:41:37,618 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 15:41:37,621 INFO L168 Benchmark]: Toolchain (without parser) took 4057.73 ms. Allocated memory was 138.4 MB in the beginning and 248.5 MB in the end (delta: 110.1 MB). Free memory was 101.7 MB in the beginning and 129.0 MB in the end (delta: -27.3 MB). Peak memory consumption was 82.8 MB. Max. memory is 7.1 GB. [2020-08-21 15:41:37,621 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 15:41:37,622 INFO L168 Benchmark]: CACSL2BoogieTranslator took 282.37 ms. Allocated memory is still 138.4 MB. Free memory was 101.5 MB in the beginning and 91.6 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-21 15:41:37,623 INFO L168 Benchmark]: Boogie Preprocessor took 112.16 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 91.6 MB in the beginning and 180.4 MB in the end (delta: -88.8 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-08-21 15:41:37,624 INFO L168 Benchmark]: RCFGBuilder took 254.38 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 168.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-21 15:41:37,625 INFO L168 Benchmark]: TraceAbstraction took 3403.57 ms. Allocated memory was 201.3 MB in the beginning and 248.5 MB in the end (delta: 47.2 MB). Free memory was 167.5 MB in the beginning and 129.0 MB in the end (delta: 38.6 MB). Peak memory consumption was 85.7 MB. Max. memory is 7.1 GB. [2020-08-21 15:41:37,629 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 282.37 ms. Allocated memory is still 138.4 MB. Free memory was 101.5 MB in the beginning and 91.6 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.16 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 91.6 MB in the beginning and 180.4 MB in the end (delta: -88.8 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 254.38 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 168.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3403.57 ms. Allocated memory was 201.3 MB in the beginning and 248.5 MB in the end (delta: 47.2 MB). Free memory was 167.5 MB in the beginning and 129.0 MB in the end (delta: 38.6 MB). Peak memory consumption was 85.7 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...