/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 --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 [2020-08-22 03:50:53,105 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:50:53,108 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:50:53,152 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:50:53,154 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:50:53,165 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:50:53,166 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:50:53,171 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:50:53,174 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:50:53,178 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:50:53,178 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:50:53,180 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:50:53,180 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:50:53,183 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:50:53,186 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:50:53,187 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:50:53,188 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:50:53,189 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:50:53,191 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:50:53,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:50:53,201 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:50:53,202 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:50:53,204 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:50:53,204 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:50:53,209 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:50:53,209 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:50:53,209 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:50:53,213 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:50:53,213 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:50:53,215 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 03:50:53,220 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:50:53,221 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:50:53,223 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:50:53,224 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 [2020-08-22 03:50:53,270 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:50:53,270 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:50:53,273 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:50:53,273 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:50:53,273 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:50:53,273 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:50:53,274 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:50:53,274 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:50:53,274 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:50:53,274 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:50:53,276 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:50:53,276 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:50:53,276 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:50:53,276 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:50:53,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:50:53,277 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:50:53,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:50:53,277 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:50:53,277 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:50:53,278 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:50:53,278 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:50:53,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:50:53,278 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:50:53,278 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:50:53,279 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:50:53,279 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:50:53,279 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:50:53,279 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:50:53,279 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:50:53,280 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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true; [2020-08-22 03:50:53,582 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:50:53,603 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:50:53,607 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:50:53,609 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:50:53,610 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:50:53,611 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 03:50:53,691 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/55161ced4/eb028dae0a634f6bbe3af6760a4e5d07/FLAGdfd1b7aa8 [2020-08-22 03:50:54,137 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:50:54,138 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 03:50:54,145 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/55161ced4/eb028dae0a634f6bbe3af6760a4e5d07/FLAGdfd1b7aa8 [2020-08-22 03:50:54,506 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/55161ced4/eb028dae0a634f6bbe3af6760a4e5d07 [2020-08-22 03:50:54,514 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:50:54,516 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:50:54,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:50:54,517 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:50:54,521 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:50:54,522 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,525 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1987833a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54, skipping insertion in model container [2020-08-22 03:50:54,525 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,533 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:50:54,553 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:50:54,705 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:50:54,709 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:50:54,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:50:54,735 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:50:54,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54 WrapperNode [2020-08-22 03:50:54,736 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:50:54,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:50:54,737 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:50:54,737 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:50:54,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,749 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,753 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,756 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,758 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,758 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (1/1) ... [2020-08-22 03:50:54,760 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:50:54,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:50:54,760 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:50:54,760 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:50:54,761 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (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 [2020-08-22 03:50:54,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:50:54,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:50:54,904 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-22 03:50:54,904 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:50:54,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:50:54,905 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-22 03:50:54,905 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:50:54,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:50:54,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:50:55,070 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:50:55,071 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 03:50:55,075 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:50:55 BoogieIcfgContainer [2020-08-22 03:50:55,075 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:50:55,076 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:50:55,076 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:50:55,080 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:50:55,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:50:54" (1/3) ... [2020-08-22 03:50:55,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a01a83f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:50:55, skipping insertion in model container [2020-08-22 03:50:55,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:50:54" (2/3) ... [2020-08-22 03:50:55,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a01a83f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:50:55, skipping insertion in model container [2020-08-22 03:50:55,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:50:55" (3/3) ... [2020-08-22 03:50:55,083 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-22 03:50:55,096 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:50:55,104 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:50:55,124 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:50:55,152 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:50:55,152 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:50:55,153 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:50:55,153 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:50:55,153 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:50:55,153 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:50:55,153 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:50:55,153 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:50:55,187 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-22 03:50:55,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 03:50:55,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:50:55,206 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:50:55,206 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:50:55,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:50:55,219 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-22 03:50:55,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:50:55,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993550524] [2020-08-22 03:50:55,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:50:55,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:50:55,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 03:50:55,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:50:55,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993550524] [2020-08-22 03:50:55,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:50:55,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:50:55,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214062836] [2020-08-22 03:50:55,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:50:55,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:50:55,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:50:55,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:50:55,535 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-22 03:50:55,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:50:55,631 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-22 03:50:55,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:50:55,633 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 03:50:55,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:50:55,644 INFO L225 Difference]: With dead ends: 30 [2020-08-22 03:50:55,644 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 03:50:55,648 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 [2020-08-22 03:50:55,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 03:50:55,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 03:50:55,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 03:50:55,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-22 03:50:55,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-22 03:50:55,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:50:55,697 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-22 03:50:55,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:50:55,698 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-22 03:50:55,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:50:55,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:50:55,700 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:50:55,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:50:55,701 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:50:55,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:50:55,702 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-22 03:50:55,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:50:55,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273622566] [2020-08-22 03:50:55,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:50:55,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:50:55,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 03:50:55,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 03:50:55,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:50:55,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 03:50:55,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273622566] [2020-08-22 03:50:55,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:50:55,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 03:50:55,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069728024] [2020-08-22 03:50:55,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 03:50:55,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:50:55,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 03:50:55,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:50:55,841 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-22 03:50:55,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:50:55,900 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-22 03:50:55,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:50:55,901 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 03:50:55,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:50:55,902 INFO L225 Difference]: With dead ends: 25 [2020-08-22 03:50:55,902 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 03:50:55,903 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 [2020-08-22 03:50:55,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 03:50:55,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 03:50:55,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 03:50:55,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-22 03:50:55,911 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-22 03:50:55,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:50:55,911 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-22 03:50:55,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 03:50:55,912 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-22 03:50:55,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:50:55,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:50:55,913 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:50:55,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:50:55,914 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:50:55,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:50:55,914 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-22 03:50:55,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:50:55,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030794257] [2020-08-22 03:50:55,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:50:55,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 03:50:55,949 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 03:50:55,950 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 03:50:55,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:50:55,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 03:50:55 BoogieIcfgContainer [2020-08-22 03:50:55,974 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 03:50:55,977 INFO L168 Benchmark]: Toolchain (without parser) took 1460.73 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 102.3 MB in the beginning and 125.2 MB in the end (delta: -23.0 MB). Peak memory consumption was 40.5 MB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,978 INFO L168 Benchmark]: CDTParser took 0.89 ms. Allocated memory is still 138.4 MB. Free memory was 120.0 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,979 INFO L168 Benchmark]: CACSL2BoogieTranslator took 219.63 ms. Allocated memory is still 138.4 MB. Free memory was 101.8 MB in the beginning and 92.7 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,980 INFO L168 Benchmark]: Boogie Preprocessor took 22.90 ms. Allocated memory is still 138.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,981 INFO L168 Benchmark]: RCFGBuilder took 315.16 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 91.3 MB in the beginning and 170.4 MB in the end (delta: -79.0 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,982 INFO L168 Benchmark]: TraceAbstraction took 898.31 ms. Allocated memory is still 201.9 MB. Free memory was 169.7 MB in the beginning and 125.2 MB in the end (delta: 44.5 MB). Peak memory consumption was 44.5 MB. Max. memory is 7.1 GB. [2020-08-22 03:50:55,987 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.89 ms. Allocated memory is still 138.4 MB. Free memory was 120.0 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 219.63 ms. Allocated memory is still 138.4 MB. Free memory was 101.8 MB in the beginning and 92.7 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.90 ms. Allocated memory is still 138.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 315.16 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 91.3 MB in the beginning and 170.4 MB in the end (delta: -79.0 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 898.31 ms. Allocated memory is still 201.9 MB. Free memory was 169.7 MB in the beginning and 125.2 MB in the end (delta: 44.5 MB). Peak memory consumption was 44.5 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: 0.8s, 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...