/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 interpolation-heuristic=FIRST --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-simple/id_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:55:16,863 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 14:55:16,934 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:55:16,938 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:55:16,941 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:55:16,943 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:55:16,945 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:55:16,947 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:55:16,949 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:55:16,955 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:55:16,960 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:55:16,961 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:55:16,962 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:55:16,962 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:55:16,965 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:55:16,976 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:55:16,977 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:55:16,978 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:55:16,979 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 14:55:17,022 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:55:17,022 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:55:17,024 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:55:17,025 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:55:17,025 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:55:17,025 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:55:17,025 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:55:17,025 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:55:17,026 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:55:17,026 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:55:17,027 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:55:17,027 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:55:17,027 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:55:17,028 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:55:17,028 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:55:17,029 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:55:17,029 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:55:17,029 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:55:17,029 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:55:17,029 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:55:17,030 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:55:17,030 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:55:17,030 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:55:17,030 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:55:17,030 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:55:17,031 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:55:17,031 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:55:17,031 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:55:17,031 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:55:17,031 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 -> interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; [2020-08-21 14:55:17,332 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:55:17,353 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:55:17,359 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:55:17,361 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:55:17,362 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:55:17,363 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o3.c [2020-08-21 14:55:17,437 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf83251bc/4623f0a158e04e52a1042dc60205ed51/FLAG9bfae92bc [2020-08-21 14:55:17,887 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:55:17,887 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_o3.c [2020-08-21 14:55:17,894 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf83251bc/4623f0a158e04e52a1042dc60205ed51/FLAG9bfae92bc [2020-08-21 14:55:18,262 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf83251bc/4623f0a158e04e52a1042dc60205ed51 [2020-08-21 14:55:18,270 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:55:18,272 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:55:18,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:55:18,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:55:18,277 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:55:18,278 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,281 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55ef1162 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18, skipping insertion in model container [2020-08-21 14:55:18,281 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,289 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:55:18,305 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:55:18,471 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:55:18,475 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:55:18,491 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:55:18,506 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:55:18,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18 WrapperNode [2020-08-21 14:55:18,507 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:55:18,508 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:55:18,508 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:55:18,508 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:55:18,521 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,522 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,529 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,531 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,531 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (1/1) ... [2020-08-21 14:55:18,532 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:55:18,533 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:55:18,533 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:55:18,533 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:55:18,534 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (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 14:55:18,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:55:18,672 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:55:18,672 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-21 14:55:18,672 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:55:18,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 14:55:18,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:55:18,672 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-21 14:55:18,673 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:55:18,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:55:18,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:55:18,851 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:55:18,852 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 14:55:18,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:55:18 BoogieIcfgContainer [2020-08-21 14:55:18,855 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:55:18,857 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:55:18,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:55:18,860 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:55:18,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:55:18" (1/3) ... [2020-08-21 14:55:18,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5858ea05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:55:18, skipping insertion in model container [2020-08-21 14:55:18,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:55:18" (2/3) ... [2020-08-21 14:55:18,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5858ea05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:55:18, skipping insertion in model container [2020-08-21 14:55:18,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:55:18" (3/3) ... [2020-08-21 14:55:18,864 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o3.c [2020-08-21 14:55:18,873 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:55:18,879 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:55:18,894 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:55:18,919 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:55:18,919 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:55:18,919 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:55:18,919 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:55:18,919 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:55:18,920 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:55:18,920 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:55:18,920 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:55:18,939 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 14:55:18,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 14:55:18,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:55:18,947 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:55:18,948 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:55:18,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:55:18,954 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-21 14:55:18,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:55:18,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127943279] [2020-08-21 14:55:18,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:55:19,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:55:19,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:55:19,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,289 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 14:55:19,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127943279] [2020-08-21 14:55:19,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:55:19,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:55:19,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301490027] [2020-08-21 14:55:19,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:55:19,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:55:19,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:55:19,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:55:19,318 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 14:55:19,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:55:19,367 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-08-21 14:55:19,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:55:19,369 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 14:55:19,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:55:19,380 INFO L225 Difference]: With dead ends: 32 [2020-08-21 14:55:19,381 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 14:55:19,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:55:19,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 14:55:19,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 14:55:19,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 14:55:19,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 14:55:19,432 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 14:55:19,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:55:19,433 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 14:55:19,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:55:19,433 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 14:55:19,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 14:55:19,436 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:55:19,436 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:55:19,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:55:19,437 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:55:19,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:55:19,437 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-21 14:55:19,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:55:19,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530998182] [2020-08-21 14:55:19,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:55:19,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:55:19,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:55:19,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:55:19,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,654 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 14:55:19,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530998182] [2020-08-21 14:55:19,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:55:19,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:55:19,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229825077] [2020-08-21 14:55:19,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:55:19,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:55:19,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:55:19,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:55:19,659 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-21 14:55:19,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:55:19,688 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 14:55:19,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:55:19,689 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-21 14:55:19,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:55:19,691 INFO L225 Difference]: With dead ends: 25 [2020-08-21 14:55:19,691 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 14:55:19,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:55:19,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 14:55:19,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 14:55:19,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 14:55:19,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 14:55:19,699 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 14:55:19,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:55:19,700 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 14:55:19,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:55:19,700 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 14:55:19,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 14:55:19,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:55:19,702 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:55:19,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:55:19,702 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:55:19,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:55:19,703 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-21 14:55:19,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:55:19,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665246822] [2020-08-21 14:55:19,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:55:19,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:55:19,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:55:19,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:55:19,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:55:19,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:55:19,937 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 14:55:19,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665246822] [2020-08-21 14:55:19,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:55:19,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:55:19,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308637542] [2020-08-21 14:55:19,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:55:19,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:55:19,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:55:19,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:55:19,940 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-08-21 14:55:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:55:19,984 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 14:55:19,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:55:19,985 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 14:55:19,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:55:19,986 INFO L225 Difference]: With dead ends: 28 [2020-08-21 14:55:19,986 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 14:55:19,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:55:19,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 14:55:19,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 14:55:19,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 14:55:19,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 14:55:19,995 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 14:55:19,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:55:19,995 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 14:55:19,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:55:19,996 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 14:55:19,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:55:19,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:55:19,997 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:55:19,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:55:19,998 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:55:19,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:55:19,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-21 14:55:19,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:55:19,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983061680] [2020-08-21 14:55:20,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:55:20,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:55:20,020 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:55:20,020 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:55:20,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:55:20,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:55:20 BoogieIcfgContainer [2020-08-21 14:55:20,053 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:55:20,058 INFO L168 Benchmark]: Toolchain (without parser) took 1783.11 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 104.6 MB in the beginning and 100.8 MB in the end (delta: 3.8 MB). Peak memory consumption was 67.2 MB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,059 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,060 INFO L168 Benchmark]: CACSL2BoogieTranslator took 234.39 ms. Allocated memory is still 140.5 MB. Free memory was 104.4 MB in the beginning and 94.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,062 INFO L168 Benchmark]: Boogie Preprocessor took 24.86 ms. Allocated memory is still 140.5 MB. Free memory was 94.8 MB in the beginning and 93.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,064 INFO L168 Benchmark]: RCFGBuilder took 322.67 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 93.4 MB in the beginning and 172.8 MB in the end (delta: -79.3 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,071 INFO L168 Benchmark]: TraceAbstraction took 1196.04 ms. Allocated memory is still 203.9 MB. Free memory was 172.8 MB in the beginning and 100.8 MB in the end (delta: 71.9 MB). Peak memory consumption was 71.9 MB. Max. memory is 7.1 GB. [2020-08-21 14:55:20,079 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 234.39 ms. Allocated memory is still 140.5 MB. Free memory was 104.4 MB in the beginning and 94.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.86 ms. Allocated memory is still 140.5 MB. Free memory was 94.8 MB in the beginning and 93.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 322.67 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 93.4 MB in the beginning and 172.8 MB in the end (delta: -79.3 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1196.04 ms. Allocated memory is still 203.9 MB. Free memory was 172.8 MB in the beginning and 100.8 MB in the end (delta: 71.9 MB). Peak memory consumption was 71.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 3 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 4, TraceHistogramMax: 4, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 55 SDtfs, 2 SDslu, 252 SDs, 0 SdLazy, 54 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 88 NumberOfCodeBlocks, 88 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 3744 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 9/18 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...