/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -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 0.1.25-5644d1e-m [2020-08-18 21:06:28,751 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:06:28,753 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:06:28,779 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:06:28,779 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:06:28,780 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:06:28,782 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:06:28,784 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:06:28,785 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:06:28,786 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:06:28,787 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:06:28,788 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:06:28,788 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:06:28,789 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:06:28,790 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:06:28,791 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:06:28,792 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:06:28,793 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:06:28,795 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:06:28,797 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:06:28,798 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:06:28,800 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:06:28,801 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:06:28,801 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:06:28,804 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 21:06:28,804 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 21:06:28,805 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 21:06:28,806 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 21:06:28,806 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 21:06:28,807 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 21:06:28,807 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 21:06:28,808 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 21:06:28,809 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 21:06:28,809 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 21:06:28,811 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 21:06:28,811 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 21:06:28,812 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 21:06:28,812 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 21:06:28,812 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:06:28,813 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:06:28,814 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:06:28,814 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 [2020-08-18 21:06:28,837 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:06:28,837 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:06:28,842 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:06:28,842 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:06:28,842 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:06:28,843 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:06:28,843 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:06:28,843 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:06:28,843 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:06:28,843 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:06:28,844 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:06:28,845 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:06:28,845 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:06:28,845 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:06:28,845 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:06:28,845 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:06:28,848 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:06:28,848 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:06:28,848 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:06:28,848 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:06:28,848 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:06:28,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:06:28,849 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:06:28,849 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:06:28,849 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=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:06:29,175 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:06:29,192 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:06:29,198 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:06:29,199 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:06:29,200 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:06:29,201 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-18 21:06:29,262 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d7fd9d07/87b541f7a53c49388d9ba7f2d8d5dd54/FLAG128e24eb6 [2020-08-18 21:06:29,721 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:06:29,727 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-18 21:06:29,736 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d7fd9d07/87b541f7a53c49388d9ba7f2d8d5dd54/FLAG128e24eb6 [2020-08-18 21:06:30,118 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d7fd9d07/87b541f7a53c49388d9ba7f2d8d5dd54 [2020-08-18 21:06:30,128 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:06:30,129 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:06:30,130 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:06:30,131 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:06:30,134 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:06:30,136 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,138 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@726a206 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30, skipping insertion in model container [2020-08-18 21:06:30,139 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,147 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:06:30,167 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:06:30,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:06:30,362 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:06:30,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:06:30,389 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:06:30,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30 WrapperNode [2020-08-18 21:06:30,390 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:06:30,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:06:30,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:06:30,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:06:30,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,401 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,406 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,406 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,409 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,412 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,412 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (1/1) ... [2020-08-18 21:06:30,414 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:06:30,414 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:06:30,415 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:06:30,415 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:06:30,416 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (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 [2020-08-18 21:06:30,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:06:30,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:06:30,556 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-18 21:06:30,556 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:06:30,557 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:06:30,557 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-18 21:06:30,557 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:06:30,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:06:30,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:06:30,717 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:06:30,718 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 21:06:30,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:06:30 BoogieIcfgContainer [2020-08-18 21:06:30,721 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:06:30,722 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:06:30,723 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:06:30,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:06:30,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:06:30" (1/3) ... [2020-08-18 21:06:30,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4004f742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:06:30, skipping insertion in model container [2020-08-18 21:06:30,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:06:30" (2/3) ... [2020-08-18 21:06:30,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4004f742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:06:30, skipping insertion in model container [2020-08-18 21:06:30,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:06:30" (3/3) ... [2020-08-18 21:06:30,729 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-18 21:06:30,737 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:06:30,743 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:06:30,757 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:06:30,780 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:06:30,780 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:06:30,780 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:06:30,780 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:06:30,781 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:06:30,781 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:06:30,781 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:06:30,781 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:06:30,797 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 21:06:30,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 21:06:30,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:06:30,805 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:06:30,805 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:06:30,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:06:30,811 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-18 21:06:30,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:06:30,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096343803] [2020-08-18 21:06:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:06:30,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:30,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:06:30,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:30,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:06:30,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:31,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:06:31,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096343803] [2020-08-18 21:06:31,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:06:31,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:06:31,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390717315] [2020-08-18 21:06:31,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:06:31,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:06:31,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:06:31,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:06:31,057 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-18 21:06:31,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:06:31,157 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-18 21:06:31,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:06:31,159 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 21:06:31,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:06:31,170 INFO L225 Difference]: With dead ends: 30 [2020-08-18 21:06:31,170 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 21:06:31,174 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 [2020-08-18 21:06:31,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 21:06:31,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 21:06:31,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 21:06:31,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-18 21:06:31,233 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-18 21:06:31,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:06:31,233 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-18 21:06:31,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:06:31,234 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-18 21:06:31,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 21:06:31,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:06:31,238 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:06:31,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:06:31,239 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:06:31,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:06:31,240 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-18 21:06:31,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:06:31,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113515653] [2020-08-18 21:06:31,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:06:31,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:31,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:06:31,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:31,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 21:06:31,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:31,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 21:06:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:06:31,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 21:06:31,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113515653] [2020-08-18 21:06:31,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:06:31,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:06:31,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443067516] [2020-08-18 21:06:31,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:06:31,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:06:31,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:06:31,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:06:31,390 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-18 21:06:31,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:06:31,458 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-18 21:06:31,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:06:31,459 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 21:06:31,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:06:31,460 INFO L225 Difference]: With dead ends: 25 [2020-08-18 21:06:31,460 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 21:06:31,462 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 [2020-08-18 21:06:31,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 21:06:31,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 21:06:31,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:06:31,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 21:06:31,469 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-18 21:06:31,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:06:31,470 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 21:06:31,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:06:31,471 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 21:06:31,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 21:06:31,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:06:31,472 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:06:31,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:06:31,473 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:06:31,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:06:31,473 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-18 21:06:31,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:06:31,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963122695] [2020-08-18 21:06:31,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:06:31,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 21:06:31,504 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 21:06:31,504 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 21:06:31,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:06:31,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 09:06:31 BoogieIcfgContainer [2020-08-18 21:06:31,544 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 21:06:31,546 INFO L168 Benchmark]: Toolchain (without parser) took 1416.03 ms. Allocated memory was 137.9 MB in the beginning and 199.8 MB in the end (delta: 61.9 MB). Free memory was 101.2 MB in the beginning and 122.6 MB in the end (delta: -21.3 MB). Peak memory consumption was 40.5 MB. Max. memory is 7.1 GB. [2020-08-18 21:06:31,547 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 21:06:31,548 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.43 ms. Allocated memory is still 137.9 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-18 21:06:31,549 INFO L168 Benchmark]: Boogie Preprocessor took 23.92 ms. Allocated memory is still 137.9 MB. Free memory was 91.8 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-18 21:06:31,551 INFO L168 Benchmark]: RCFGBuilder took 306.97 ms. Allocated memory was 137.9 MB in the beginning and 199.8 MB in the end (delta: 61.9 MB). Free memory was 90.5 MB in the beginning and 167.3 MB in the end (delta: -76.8 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-18 21:06:31,551 INFO L168 Benchmark]: TraceAbstraction took 821.35 ms. Allocated memory is still 199.8 MB. Free memory was 166.6 MB in the beginning and 122.6 MB in the end (delta: 44.0 MB). Peak memory consumption was 44.0 MB. Max. memory is 7.1 GB. [2020-08-18 21:06:31,556 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 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 259.43 ms. Allocated memory is still 137.9 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.92 ms. Allocated memory is still 137.9 MB. Free memory was 91.8 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 306.97 ms. Allocated memory was 137.9 MB in the beginning and 199.8 MB in the end (delta: 61.9 MB). Free memory was 90.5 MB in the beginning and 167.3 MB in the end (delta: -76.8 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 821.35 ms. Allocated memory is still 199.8 MB. Free memory was 166.6 MB in the beginning and 122.6 MB in the end (delta: 44.0 MB). Peak memory consumption was 44.0 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: 0.2s, 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...