/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -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-d623d84 [2020-07-20 11:19:17,188 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:19:17,192 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:19:17,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:19:17,219 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:19:17,222 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:19:17,225 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:19:17,242 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:19:17,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:19:17,248 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:19:17,251 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:19:17,253 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:19:17,253 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:19:17,256 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:19:17,260 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:19:17,263 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:19:17,266 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:19:17,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:19:17,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:19:17,280 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:19:17,285 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:19:17,291 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:19:17,292 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:19:17,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:19:17,296 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:19:17,305 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:19:17,306 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:19:17,307 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:19:17,308 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:19:17,325 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:19:17,326 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:19:17,328 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:19:17,328 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:19:17,328 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:19:17,328 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:19:17,329 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:19:17,329 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:19:17,329 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:19:17,329 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:19:17,329 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:19:17,330 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:19:17,330 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:19:17,330 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:19:17,330 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:19:17,331 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:19:17,331 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:19:17,331 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:19:17,331 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:19:17,331 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:19:17,332 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:19:17,332 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:19:17,332 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:19:17,332 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:19:17,333 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:19:17,333 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:19:17,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:17,333 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:19:17,333 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:19:17,334 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:19:17,688 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:19:17,705 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:19:17,710 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:19:17,712 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:19:17,713 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:19:17,714 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-20 11:19:17,821 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3fd0aabd/080f5e9209bf4110b6e13db734253ca5/FLAG5fa679a12 [2020-07-20 11:19:18,476 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:19:18,478 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-20 11:19:18,487 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3fd0aabd/080f5e9209bf4110b6e13db734253ca5/FLAG5fa679a12 [2020-07-20 11:19:18,811 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3fd0aabd/080f5e9209bf4110b6e13db734253ca5 [2020-07-20 11:19:18,822 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:19:18,826 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:19:18,828 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:19:18,828 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:19:18,833 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:19:18,835 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:19:18" (1/1) ... [2020-07-20 11:19:18,840 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ce438f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:18, skipping insertion in model container [2020-07-20 11:19:18,840 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:19:18" (1/1) ... [2020-07-20 11:19:18,851 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:19:18,873 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:19:19,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:19:19,082 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:19:19,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:19:19,123 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:19:19,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19 WrapperNode [2020-07-20 11:19:19,124 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:19:19,125 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:19:19,125 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:19:19,126 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:19:19,145 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,154 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,155 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,160 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,164 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,165 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... [2020-07-20 11:19:19,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:19:19,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:19:19,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:19:19,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:19:19,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 11:19:19,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:19:19,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:19:19,366 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-20 11:19:19,366 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:19:19,366 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:19:19,366 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-20 11:19:19,366 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:19:19,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:19:19,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:19:19,562 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:19:19,563 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:19:19,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:19:19 BoogieIcfgContainer [2020-07-20 11:19:19,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:19:19,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:19:19,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:19:19,588 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:19:19,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:19:18" (1/3) ... [2020-07-20 11:19:19,606 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a09c61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:19:19, skipping insertion in model container [2020-07-20 11:19:19,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:19:19" (2/3) ... [2020-07-20 11:19:19,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a09c61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:19:19, skipping insertion in model container [2020-07-20 11:19:19,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:19:19" (3/3) ... [2020-07-20 11:19:19,619 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-07-20 11:19:19,666 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:19:19,683 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:19:19,702 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:19:19,742 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:19:19,743 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:19:19,743 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:19:19,743 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:19:19,743 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:19:19,744 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:19:19,744 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:19:19,744 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:19:19,767 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:19:19,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:19:19,777 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:19:19,779 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:19:19,779 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:19:19,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:19:19,794 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-20 11:19:19,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:19:19,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56281579] [2020-07-20 11:19:19,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:19,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:19:19,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:19:19,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:19:19,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:19:19,994 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:19:19,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56281579] [2020-07-20 11:19:19,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:19:19,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:19:19,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391107930] [2020-07-20 11:19:20,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:19:20,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:19:20,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:19:20,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:19:20,024 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:19:20,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:19:20,145 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 11:19:20,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:19:20,147 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:19:20,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:19:20,158 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:19:20,159 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:19:20,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:19:20,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:19:20,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:19:20,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:19:20,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:19:20,241 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:19:20,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:19:20,242 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:19:20,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:19:20,242 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:19:20,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:19:20,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:19:20,245 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:19:20,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:20,462 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:19:20,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:19:20,463 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-20 11:19:20,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:19:20,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488085827] [2020-07-20 11:19:20,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:20,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:19:20,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:19:20,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:19:20,563 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:19:20,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:19:20,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:19:20,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:19:20,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488085827] [2020-07-20 11:19:20,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:19:20,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-20 11:19:20,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768601354] [2020-07-20 11:19:20,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:19:20,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:19:20,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:19:20,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:19:20,788 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-07-20 11:19:20,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:19:20,857 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 11:19:20,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:19:20,858 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-20 11:19:20,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:19:20,859 INFO L225 Difference]: With dead ends: 25 [2020-07-20 11:19:20,859 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:19:20,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:19:20,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:19:20,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:19:20,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:19:20,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 11:19:20,870 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 11:19:20,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:19:20,870 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 11:19:20,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:19:20,871 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 11:19:20,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:19:20,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:19:20,873 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:19:21,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:21,088 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:19:21,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:19:21,089 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-20 11:19:21,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:19:21,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385521794] [2020-07-20 11:19:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:21,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:19:21,131 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:19:21,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:19:21,142 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:19:21,162 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:19:21,163 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:19:21,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:21,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:19:21 BoogieIcfgContainer [2020-07-20 11:19:21,406 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:19:21,410 INFO L168 Benchmark]: Toolchain (without parser) took 2584.65 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 101.4 MB in the beginning and 96.5 MB in the end (delta: 4.9 MB). Peak memory consumption was 69.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,411 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,411 INFO L168 Benchmark]: CACSL2BoogieTranslator took 296.64 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 91.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,412 INFO L168 Benchmark]: Boogie Preprocessor took 43.09 ms. Allocated memory is still 137.4 MB. Free memory was 91.7 MB in the beginning and 90.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,414 INFO L168 Benchmark]: RCFGBuilder took 400.90 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 90.4 MB in the beginning and 170.4 MB in the end (delta: -80.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,414 INFO L168 Benchmark]: TraceAbstraction took 1824.75 ms. Allocated memory is still 202.4 MB. Free memory was 170.4 MB in the beginning and 96.5 MB in the end (delta: 73.9 MB). Peak memory consumption was 73.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:19:21,419 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 296.64 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 91.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 43.09 ms. Allocated memory is still 137.4 MB. Free memory was 91.7 MB in the beginning and 90.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 400.90 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 90.4 MB in the beginning and 170.4 MB in the end (delta: -80.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1824.75 ms. Allocated memory is still 202.4 MB. Free memory was 170.4 MB in the beginning and 96.5 MB in the end (delta: 73.9 MB). Peak memory consumption was 73.9 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; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 26 SDslu, 58 SDs, 0 SdLazy, 46 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 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, 0.4s InterpolantComputationTime, 57 NumberOfCodeBlocks, 57 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1752 SizeOfPredicates, 5 NumberOfNonLiveVariables, 92 ConjunctsInSsa, 10 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 3/8 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...