/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=HIGHLEXORDER --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/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:56:54,416 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 18:56:54,443 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:56:54,444 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:56:54,445 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:56:54,447 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:56:54,449 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:56:54,450 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:56:54,451 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:56:54,452 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:56:54,452 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:56:54,453 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:56:54,454 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:56:54,455 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:56:54,456 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:56:54,457 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:56:54,459 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:56:54,462 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:56:54,463 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:56:54,465 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:56:54,466 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:56:54,467 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:56:54,470 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:56:54,478 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:56:54,479 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:56:54,480 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:56:54,481 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 18:56:54,507 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:56:54,507 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:56:54,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:56:54,510 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:56:54,510 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:56:54,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:56:54,511 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:56:54,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:56:54,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:56:54,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:56:54,511 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:56:54,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:56:54,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:56:54,512 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:56:54,512 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:56:54,512 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:56:54,513 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:56:54,514 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:56:54,514 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:56:54,514 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:56:54,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:56:54,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:56:54,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:56:54,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:56:54,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:56:54,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:56:54,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:56:54,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:56:54,517 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:56:54,517 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=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:56:54,848 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:56:54,861 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:56:54,864 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:56:54,866 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:56:54,867 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:56:54,867 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-21 18:56:54,947 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31da13194/00e6cb51018c472db66a402fbd96555a/FLAGff2b5f3cd [2020-08-21 18:56:55,426 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:56:55,427 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-21 18:56:55,434 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31da13194/00e6cb51018c472db66a402fbd96555a/FLAGff2b5f3cd [2020-08-21 18:56:55,812 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31da13194/00e6cb51018c472db66a402fbd96555a [2020-08-21 18:56:55,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:56:55,825 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:56:55,826 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:56:55,826 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:56:55,830 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:56:55,831 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:56:55" (1/1) ... [2020-08-21 18:56:55,833 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@217f90c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:55, skipping insertion in model container [2020-08-21 18:56:55,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:56:55" (1/1) ... [2020-08-21 18:56:55,841 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:56:55,858 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:56:56,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:56:56,101 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:56:56,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:56:56,135 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:56:56,136 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56 WrapperNode [2020-08-21 18:56:56,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:56:56,137 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:56:56,137 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:56:56,137 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:56:56,148 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,148 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,153 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,157 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,159 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,160 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (1/1) ... [2020-08-21 18:56:56,161 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:56:56,162 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:56:56,162 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:56:56,162 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:56:56,163 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (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 18:56:56,301 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:56:56,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:56:56,302 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-21 18:56:56,302 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:56:56,302 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:56:56,302 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-21 18:56:56,302 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:56:56,303 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:56:56,303 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:56:56,474 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:56:56,474 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:56:56,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:56:56 BoogieIcfgContainer [2020-08-21 18:56:56,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:56:56,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:56:56,481 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:56:56,484 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:56:56,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:56:55" (1/3) ... [2020-08-21 18:56:56,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20a73258 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:56:56, skipping insertion in model container [2020-08-21 18:56:56,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:56" (2/3) ... [2020-08-21 18:56:56,486 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20a73258 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:56:56, skipping insertion in model container [2020-08-21 18:56:56,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:56:56" (3/3) ... [2020-08-21 18:56:56,488 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-21 18:56:56,501 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:56:56,510 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:56:56,526 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:56:56,556 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:56:56,556 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:56:56,557 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:56:56,557 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:56:56,557 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:56:56,558 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:56:56,558 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:56:56,558 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:56:56,585 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 18:56:56,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:56:56,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:56,596 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:56,596 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:56,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:56,604 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-21 18:56:56,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:56,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130483065] [2020-08-21 18:56:56,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:56,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:56,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:56,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,827 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 18:56:56,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130483065] [2020-08-21 18:56:56,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:56:56,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:56:56,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146454827] [2020-08-21 18:56:56,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:56:56,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:56,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:56:56,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:56:56,858 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 18:56:56,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:56,947 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 18:56:56,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:56:56,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:56:56,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:56,960 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:56:56,960 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 18:56:56,964 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 18:56:56,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 18:56:57,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 18:56:57,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 18:56:57,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 18:56:57,007 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 18:56:57,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:57,007 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 18:56:57,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:56:57,008 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 18:56:57,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:56:57,010 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:57,010 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 18:56:57,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:56:57,011 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:57,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:57,012 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-21 18:56:57,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:57,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611727817] [2020-08-21 18:56:57,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:57,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:57,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,141 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 18:56:57,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611727817] [2020-08-21 18:56:57,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:57,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:56:57,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074868165] [2020-08-21 18:56:57,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:56:57,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:57,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:56:57,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:56:57,149 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 18:56:57,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:57,222 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 18:56:57,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:56:57,223 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 18:56:57,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:57,224 INFO L225 Difference]: With dead ends: 25 [2020-08-21 18:56:57,224 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 18:56:57,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 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 18:56:57,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 18:56:57,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 18:56:57,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:56:57,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 18:56:57,232 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 18:56:57,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:57,233 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 18:56:57,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:56:57,233 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 18:56:57,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:56:57,234 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:57,234 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 18:56:57,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:56:57,235 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:57,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:57,235 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-21 18:56:57,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:57,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563237781] [2020-08-21 18:56:57,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:57,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:56:57,262 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:56:57,262 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:56:57,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:56:57,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:56:57 BoogieIcfgContainer [2020-08-21 18:56:57,286 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:56:57,288 INFO L168 Benchmark]: Toolchain (without parser) took 1463.31 ms. Allocated memory was 138.4 MB in the beginning and 200.3 MB in the end (delta: 61.9 MB). Free memory was 101.4 MB in the beginning and 123.4 MB in the end (delta: -21.9 MB). Peak memory consumption was 39.9 MB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,290 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,290 INFO L168 Benchmark]: CACSL2BoogieTranslator took 310.67 ms. Allocated memory is still 138.4 MB. Free memory was 101.2 MB in the beginning and 91.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,291 INFO L168 Benchmark]: Boogie Preprocessor took 24.62 ms. Allocated memory is still 138.4 MB. Free memory was 91.9 MB in the beginning and 90.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,292 INFO L168 Benchmark]: RCFGBuilder took 317.28 ms. Allocated memory was 138.4 MB in the beginning and 200.3 MB in the end (delta: 61.9 MB). Free memory was 90.6 MB in the beginning and 168.2 MB in the end (delta: -77.6 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,294 INFO L168 Benchmark]: TraceAbstraction took 805.48 ms. Allocated memory is still 200.3 MB. Free memory was 167.5 MB in the beginning and 123.4 MB in the end (delta: 44.2 MB). Peak memory consumption was 44.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:56:57,298 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 310.67 ms. Allocated memory is still 138.4 MB. Free memory was 101.2 MB in the beginning and 91.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.62 ms. Allocated memory is still 138.4 MB. Free memory was 91.9 MB in the beginning and 90.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 317.28 ms. Allocated memory was 138.4 MB in the beginning and 200.3 MB in the end (delta: 61.9 MB). Free memory was 90.6 MB in the beginning and 168.2 MB in the end (delta: -77.6 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 805.48 ms. Allocated memory is still 200.3 MB. Free memory was 167.5 MB in the beginning and 123.4 MB in the end (delta: 44.2 MB). Peak memory consumption was 44.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 58 SDs, 0 SdLazy, 44 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 57 NumberOfCodeBlocks, 57 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 30 ConstructedInterpolants, 0 QuantifiedInterpolants, 888 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 1 PerfectInterpolantSequences, 2/4 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...