/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --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 23:45:24,416 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:45:24,419 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:45:24,462 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:45:24,463 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:45:24,474 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:45:24,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:45:24,478 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:45:24,482 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:45:24,486 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:45:24,487 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:45:24,488 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:45:24,489 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:45:24,489 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:45:24,494 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:45:24,496 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:45:24,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:45:24,501 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:45:24,502 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:45:24,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:45:24,509 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:45:24,510 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:45:24,511 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:45:24,511 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:45:24,514 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 23:45:24,516 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:45:24,517 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:45:24,518 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:45:24,518 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:45:24,519 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:45:24,520 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:45:24,520 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:45:24,520 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:45:24,521 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:45:24,522 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:45:24,522 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:45:24,523 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 23:45:24,545 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:45:24,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:45:24,547 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:45:24,547 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:45:24,547 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:45:24,548 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:45:24,548 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:45:24,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:45:24,548 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:45:24,548 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:45:24,549 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:45:24,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:45:24,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:45:24,549 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:45:24,549 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:45:24,550 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:45:24,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:45:24,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:45:24,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:45:24,550 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:45:24,551 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:45:24,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:45:24,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:45:24,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:45:24,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:45:24,552 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:45:24,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:45:24,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:45:24,552 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:45:24,552 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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:45:24,866 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:45:24,879 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:45:24,883 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:45:24,885 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:45:24,885 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:45:24,886 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 23:45:24,949 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eea4ebb66/d4a238d042974f428edab27d5af15ce6/FLAGca024c469 [2020-08-21 23:45:25,398 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:45:25,399 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 23:45:25,406 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eea4ebb66/d4a238d042974f428edab27d5af15ce6/FLAGca024c469 [2020-08-21 23:45:25,765 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eea4ebb66/d4a238d042974f428edab27d5af15ce6 [2020-08-21 23:45:25,775 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:45:25,777 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:45:25,778 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:45:25,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:45:25,782 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:45:25,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:45:25" (1/1) ... [2020-08-21 23:45:25,787 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c96dc2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:25, skipping insertion in model container [2020-08-21 23:45:25,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:45:25" (1/1) ... [2020-08-21 23:45:25,796 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:45:25,815 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:45:26,037 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:45:26,042 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:45:26,059 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:45:26,076 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:45:26,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26 WrapperNode [2020-08-21 23:45:26,077 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:45:26,078 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:45:26,078 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:45:26,078 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:45:26,094 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,187 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,188 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,196 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,197 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (1/1) ... [2020-08-21 23:45:26,203 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:45:26,203 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:45:26,204 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:45:26,204 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:45:26,205 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (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 23:45:26,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:45:26,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:45:26,269 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-21 23:45:26,269 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:45:26,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:45:26,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 23:45:26,269 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-21 23:45:26,270 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:45:26,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:45:26,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:45:26,451 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:45:26,451 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 23:45:26,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:45:26 BoogieIcfgContainer [2020-08-21 23:45:26,455 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:45:26,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:45:26,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:45:26,460 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:45:26,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:45:25" (1/3) ... [2020-08-21 23:45:26,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@721231c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:45:26, skipping insertion in model container [2020-08-21 23:45:26,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:45:26" (2/3) ... [2020-08-21 23:45:26,462 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@721231c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:45:26, skipping insertion in model container [2020-08-21 23:45:26,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:45:26" (3/3) ... [2020-08-21 23:45:26,464 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-08-21 23:45:26,482 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:45:26,488 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:45:26,503 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:45:26,529 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:45:26,530 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:45:26,530 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:45:26,530 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:45:26,530 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:45:26,530 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:45:26,530 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:45:26,531 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:45:26,548 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-21 23:45:26,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:45:26,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:26,557 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:45:26,557 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:26,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:26,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-08-21 23:45:26,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:26,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566776867] [2020-08-21 23:45:26,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:26,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:26,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:26,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:26,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:26,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:26,796 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 23:45:26,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566776867] [2020-08-21 23:45:26,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:45:26,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:45:26,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699977518] [2020-08-21 23:45:26,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:45:26,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:26,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:45:26,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:45:26,828 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-08-21 23:45:26,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:26,965 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-21 23:45:26,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:45:26,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 23:45:26,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:26,980 INFO L225 Difference]: With dead ends: 35 [2020-08-21 23:45:26,980 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 23:45:26,984 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 23:45:27,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 23:45:27,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 23:45:27,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:45:27,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 23:45:27,041 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-21 23:45:27,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:27,042 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 23:45:27,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:45:27,043 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 23:45:27,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 23:45:27,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:27,045 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:45:27,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:45:27,046 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:27,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:27,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-08-21 23:45:27,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:27,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701929157] [2020-08-21 23:45:27,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:27,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:27,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:27,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,114 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 23:45:27,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701929157] [2020-08-21 23:45:27,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:45:27,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:45:27,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224153145] [2020-08-21 23:45:27,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:45:27,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:27,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:45:27,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:45:27,120 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-21 23:45:27,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:27,190 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 23:45:27,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:45:27,191 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 23:45:27,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:27,192 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:45:27,193 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 23:45:27,194 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 23:45:27,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 23:45:27,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-21 23:45:27,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:45:27,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 23:45:27,203 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-21 23:45:27,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:27,204 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 23:45:27,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:45:27,204 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 23:45:27,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 23:45:27,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:27,206 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 23:45:27,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:45:27,207 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:27,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:27,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-08-21 23:45:27,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:27,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670838678] [2020-08-21 23:45:27,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:27,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:27,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:27,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:27,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 23:45:27,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,384 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 23:45:27,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670838678] [2020-08-21 23:45:27,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:27,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:45:27,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905104112] [2020-08-21 23:45:27,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:45:27,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:27,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:45:27,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:45:27,390 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-08-21 23:45:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:27,525 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-21 23:45:27,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:45:27,526 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-08-21 23:45:27,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:27,528 INFO L225 Difference]: With dead ends: 38 [2020-08-21 23:45:27,528 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 23:45:27,530 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 23:45:27,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 23:45:27,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 23:45:27,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 23:45:27,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-21 23:45:27,539 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-21 23:45:27,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:27,539 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-21 23:45:27,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:45:27,540 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-21 23:45:27,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 23:45:27,542 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:27,542 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 23:45:27,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:45:27,542 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:27,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:27,543 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-08-21 23:45:27,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:27,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111743467] [2020-08-21 23:45:27,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:27,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:27,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:27,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:27,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:27,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,666 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 23:45:27,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111743467] [2020-08-21 23:45:27,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:27,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:45:27,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67029043] [2020-08-21 23:45:27,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:45:27,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:27,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:45:27,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:45:27,670 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-21 23:45:27,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:27,785 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-21 23:45:27,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:45:27,785 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-21 23:45:27,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:27,788 INFO L225 Difference]: With dead ends: 41 [2020-08-21 23:45:27,788 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 23:45:27,789 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 23:45:27,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 23:45:27,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 23:45:27,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 23:45:27,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-21 23:45:27,801 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-21 23:45:27,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:27,801 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-21 23:45:27,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:45:27,802 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-21 23:45:27,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 23:45:27,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:27,804 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 23:45:27,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:45:27,804 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:27,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:27,805 INFO L82 PathProgramCache]: Analyzing trace with hash -111055954, now seen corresponding path program 2 times [2020-08-21 23:45:27,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:27,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333274272] [2020-08-21 23:45:27,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:27,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:27,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:27,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:27,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:27,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:27,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:27,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:27,978 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 23:45:27,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333274272] [2020-08-21 23:45:27,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:27,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:45:27,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070478547] [2020-08-21 23:45:27,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:45:27,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:27,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:45:27,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:45:27,981 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 7 states. [2020-08-21 23:45:28,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:28,090 INFO L93 Difference]: Finished difference Result 76 states and 119 transitions. [2020-08-21 23:45:28,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:45:28,091 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-08-21 23:45:28,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:28,093 INFO L225 Difference]: With dead ends: 76 [2020-08-21 23:45:28,093 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 23:45:28,095 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 23:45:28,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 23:45:28,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-08-21 23:45:28,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:45:28,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2020-08-21 23:45:28,106 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 40 [2020-08-21 23:45:28,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:28,107 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2020-08-21 23:45:28,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:45:28,107 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2020-08-21 23:45:28,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 23:45:28,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:28,109 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 23:45:28,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:45:28,109 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:28,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:28,110 INFO L82 PathProgramCache]: Analyzing trace with hash 380905728, now seen corresponding path program 3 times [2020-08-21 23:45:28,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:28,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602218581] [2020-08-21 23:45:28,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:28,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:28,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:28,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:28,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:28,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,260 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 23:45:28,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602218581] [2020-08-21 23:45:28,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:28,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:45:28,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483394409] [2020-08-21 23:45:28,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:45:28,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:28,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:45:28,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:45:28,263 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand 7 states. [2020-08-21 23:45:28,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:28,395 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2020-08-21 23:45:28,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:45:28,396 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-21 23:45:28,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:28,398 INFO L225 Difference]: With dead ends: 62 [2020-08-21 23:45:28,399 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 23:45:28,399 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 23:45:28,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 23:45:28,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2020-08-21 23:45:28,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 23:45:28,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 81 transitions. [2020-08-21 23:45:28,415 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 81 transitions. Word has length 41 [2020-08-21 23:45:28,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:28,415 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 81 transitions. [2020-08-21 23:45:28,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:45:28,416 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 81 transitions. [2020-08-21 23:45:28,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 23:45:28,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:28,420 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 23:45:28,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:45:28,421 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:28,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:28,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 4 times [2020-08-21 23:45:28,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:28,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128982641] [2020-08-21 23:45:28,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:28,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:28,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:28,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:28,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:28,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 23:45:28,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:28,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:28,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,657 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 23:45:28,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128982641] [2020-08-21 23:45:28,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:28,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:45:28,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465228406] [2020-08-21 23:45:28,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:45:28,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:28,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:45:28,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:45:28,660 INFO L87 Difference]: Start difference. First operand 55 states and 81 transitions. Second operand 8 states. [2020-08-21 23:45:28,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:28,815 INFO L93 Difference]: Finished difference Result 97 states and 150 transitions. [2020-08-21 23:45:28,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:45:28,815 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 82 [2020-08-21 23:45:28,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:28,819 INFO L225 Difference]: With dead ends: 97 [2020-08-21 23:45:28,820 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 23:45:28,821 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 23:45:28,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 23:45:28,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-08-21 23:45:28,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 23:45:28,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 137 transitions. [2020-08-21 23:45:28,841 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 137 transitions. Word has length 82 [2020-08-21 23:45:28,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:28,841 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 137 transitions. [2020-08-21 23:45:28,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:45:28,842 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 137 transitions. [2020-08-21 23:45:28,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-08-21 23:45:28,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:28,849 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 23:45:28,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:45:28,849 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:28,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:28,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-08-21 23:45:28,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:28,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555549989] [2020-08-21 23:45:28,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:28,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:45:28,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:45:28,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:28,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:28,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:29,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 23:45:29,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:29,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 23:45:29,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:29,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 23:45:29,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 23:45:29,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 23:45:29,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 23:45:29,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 23:45:29,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:45:29,382 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 23:45:29,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555549989] [2020-08-21 23:45:29,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:45:29,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 23:45:29,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233182075] [2020-08-21 23:45:29,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 23:45:29,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:45:29,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 23:45:29,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:45:29,388 INFO L87 Difference]: Start difference. First operand 87 states and 137 transitions. Second operand 12 states. [2020-08-21 23:45:29,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:45:29,801 INFO L93 Difference]: Finished difference Result 153 states and 266 transitions. [2020-08-21 23:45:29,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 23:45:29,801 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 150 [2020-08-21 23:45:29,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:45:29,803 INFO L225 Difference]: With dead ends: 153 [2020-08-21 23:45:29,803 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 23:45:29,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=177, Invalid=525, Unknown=0, NotChecked=0, Total=702 [2020-08-21 23:45:29,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 23:45:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-08-21 23:45:29,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 23:45:29,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2020-08-21 23:45:29,816 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 150 [2020-08-21 23:45:29,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:45:29,817 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2020-08-21 23:45:29,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 23:45:29,817 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2020-08-21 23:45:29,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 23:45:29,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:45:29,819 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 23:45:29,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:45:29,820 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:45:29,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:45:29,820 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-08-21 23:45:29,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:45:29,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724680174] [2020-08-21 23:45:29,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:45:29,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 23:45:29,841 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 23:45:29,841 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 23:45:29,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:45:29,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 11:45:29 BoogieIcfgContainer [2020-08-21 23:45:29,871 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 23:45:29,873 INFO L168 Benchmark]: Toolchain (without parser) took 4096.21 ms. Allocated memory was 141.0 MB in the beginning and 245.4 MB in the end (delta: 104.3 MB). Free memory was 102.9 MB in the beginning and 107.3 MB in the end (delta: -4.4 MB). Peak memory consumption was 99.9 MB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,874 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 141.0 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,875 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.56 ms. Allocated memory is still 141.0 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,876 INFO L168 Benchmark]: Boogie Preprocessor took 125.26 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 93.1 MB in the beginning and 181.5 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,877 INFO L168 Benchmark]: RCFGBuilder took 251.31 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 170.1 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,878 INFO L168 Benchmark]: TraceAbstraction took 3414.85 ms. Allocated memory was 203.4 MB in the beginning and 245.4 MB in the end (delta: 41.9 MB). Free memory was 169.5 MB in the beginning and 107.3 MB in the end (delta: 62.2 MB). Peak memory consumption was 104.1 MB. Max. memory is 7.1 GB. [2020-08-21 23:45:29,882 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 141.0 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.56 ms. Allocated memory is still 141.0 MB. Free memory was 102.7 MB in the beginning and 93.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.26 ms. Allocated memory was 141.0 MB in the beginning and 203.4 MB in the end (delta: 62.4 MB). Free memory was 93.1 MB in the beginning and 181.5 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 251.31 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 170.1 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3414.85 ms. Allocated memory was 203.4 MB in the beginning and 245.4 MB in the end (delta: 41.9 MB). Free memory was 169.5 MB in the beginning and 107.3 MB in the end (delta: 62.2 MB). Peak memory consumption was 104.1 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...