/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 -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 0.1.25-3af5e1f [2020-09-04 13:23:08,788 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:23:08,792 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:23:08,818 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:23:08,818 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:23:08,820 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:23:08,821 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:23:08,823 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:23:08,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:23:08,826 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:23:08,827 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:23:08,831 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:23:08,831 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:23:08,837 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:23:08,838 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:23:08,839 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:23:08,840 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:23:08,841 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:23:08,843 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:23:08,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:23:08,847 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:23:08,848 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:23:08,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:23:08,850 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:23:08,853 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:23:08,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:23:08,863 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:23:08,864 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:23:08,865 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 [2020-09-04 13:23:08,890 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:23:08,891 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:23:08,892 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:23:08,892 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:23:08,893 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:23:08,893 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:23:08,893 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:23:08,893 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:23:08,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:23:08,894 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:23:08,894 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:23:08,894 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:23:08,894 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:23:08,894 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:23:08,895 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:23:08,895 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:23:08,895 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:23:08,895 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:23:08,895 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:23:08,896 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:23:08,896 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:23:08,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:23:08,896 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:23:08,897 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:23:08,897 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:23:08,897 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:23:08,897 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:23:08,897 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:23:08,898 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:23:08,898 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:23:09,370 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:23:09,388 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:23:09,393 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:23:09,395 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:23:09,395 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:23:09,396 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-09-04 13:23:09,491 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbca25f4/5b435f343d8f4ae2a820b5ee4a0aa480/FLAGcba1edcc5 [2020-09-04 13:23:09,998 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:23:09,998 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-09-04 13:23:10,006 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbca25f4/5b435f343d8f4ae2a820b5ee4a0aa480/FLAGcba1edcc5 [2020-09-04 13:23:10,361 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dfbca25f4/5b435f343d8f4ae2a820b5ee4a0aa480 [2020-09-04 13:23:10,375 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:23:10,376 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:23:10,377 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:23:10,378 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:23:10,382 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:23:10,383 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23bccf0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10, skipping insertion in model container [2020-09-04 13:23:10,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,397 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:23:10,423 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:23:10,706 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:23:10,711 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:23:10,728 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:23:10,743 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:23:10,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10 WrapperNode [2020-09-04 13:23:10,744 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:23:10,744 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:23:10,745 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:23:10,745 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:23:10,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,765 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,769 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,772 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,773 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (1/1) ... [2020-09-04 13:23:10,774 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:23:10,775 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:23:10,775 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:23:10,775 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:23:10,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (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 [2020-09-04 13:23:10,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:23:10,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:23:10,940 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-09-04 13:23:10,940 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:23:10,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:23:10,941 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-09-04 13:23:10,941 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:23:10,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:23:10,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:23:11,159 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:23:11,159 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 13:23:11,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:23:11 BoogieIcfgContainer [2020-09-04 13:23:11,165 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:23:11,166 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:23:11,166 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:23:11,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:23:11,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:23:10" (1/3) ... [2020-09-04 13:23:11,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58e6850c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:23:11, skipping insertion in model container [2020-09-04 13:23:11,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:23:10" (2/3) ... [2020-09-04 13:23:11,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58e6850c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:23:11, skipping insertion in model container [2020-09-04 13:23:11,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:23:11" (3/3) ... [2020-09-04 13:23:11,174 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-09-04 13:23:11,187 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:23:11,197 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:23:11,224 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:23:11,272 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:23:11,272 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:23:11,273 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:23:11,273 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:23:11,273 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:23:11,273 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:23:11,273 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:23:11,274 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:23:11,303 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-09-04 13:23:11,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-04 13:23:11,311 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:23:11,313 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:23:11,313 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:23:11,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:23:11,322 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-09-04 13:23:11,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:23:11,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833080823] [2020-09-04 13:23:11,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:23:11,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:11,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:23:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:11,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:23:11,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:11,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:23:11,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833080823] [2020-09-04 13:23:11,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:23:11,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:23:11,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012708670] [2020-09-04 13:23:11,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:23:11,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:23:11,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:23:11,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:23:11,630 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-09-04 13:23:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:23:11,747 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-09-04 13:23:11,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:23:11,750 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-09-04 13:23:11,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:23:11,763 INFO L225 Difference]: With dead ends: 30 [2020-09-04 13:23:11,763 INFO L226 Difference]: Without dead ends: 18 [2020-09-04 13:23:11,768 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 [2020-09-04 13:23:11,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-04 13:23:11,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-04 13:23:11,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-04 13:23:11,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-09-04 13:23:11,828 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-09-04 13:23:11,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:23:11,829 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-09-04 13:23:11,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:23:11,829 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-09-04 13:23:11,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 13:23:11,832 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:23:11,832 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:23:11,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:23:11,833 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:23:11,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:23:11,834 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-09-04 13:23:11,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:23:11,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513960411] [2020-09-04 13:23:11,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:23:11,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:11,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:23:11,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:11,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:23:11,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:12,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:23:12,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:12,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:23:12,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513960411] [2020-09-04 13:23:12,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648817808] [2020-09-04 13:23:12,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:23:12,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:23:12,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:23:12,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:23:12,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:23:12,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:23:12,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-09-04 13:23:12,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536903177] [2020-09-04 13:23:12,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:23:12,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:23:12,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:23:12,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:23:12,260 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-09-04 13:23:12,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:23:12,328 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-09-04 13:23:12,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:23:12,328 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-09-04 13:23:12,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:23:12,330 INFO L225 Difference]: With dead ends: 25 [2020-09-04 13:23:12,330 INFO L226 Difference]: Without dead ends: 21 [2020-09-04 13:23:12,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:23:12,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-04 13:23:12,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-04 13:23:12,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-04 13:23:12,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-04 13:23:12,338 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-09-04 13:23:12,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:23:12,339 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-04 13:23:12,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:23:12,339 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-04 13:23:12,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-04 13:23:12,340 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:23:12,341 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:23:12,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:23:12,542 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:23:12,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:23:12,543 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-09-04 13:23:12,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:23:12,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996811071] [2020-09-04 13:23:12,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:23:12,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:23:12,584 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:23:12,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:23:12,621 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:23:12,641 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:23:12,641 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:23:12,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 13:23:12,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:23:12 BoogieIcfgContainer [2020-09-04 13:23:12,675 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:23:12,678 INFO L168 Benchmark]: Toolchain (without parser) took 2300.53 ms. Allocated memory was 146.3 MB in the beginning and 202.9 MB in the end (delta: 56.6 MB). Free memory was 101.6 MB in the beginning and 113.9 MB in the end (delta: -12.3 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:23:12,679 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 146.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 13:23:12,680 INFO L168 Benchmark]: CACSL2BoogieTranslator took 366.62 ms. Allocated memory is still 146.3 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:23:12,681 INFO L168 Benchmark]: Boogie Preprocessor took 30.20 ms. Allocated memory is still 146.3 MB. Free memory was 92.1 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:23:12,682 INFO L168 Benchmark]: RCFGBuilder took 389.68 ms. Allocated memory was 146.3 MB in the beginning and 202.9 MB in the end (delta: 56.6 MB). Free memory was 90.8 MB in the beginning and 171.2 MB in the end (delta: -80.4 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-09-04 13:23:12,683 INFO L168 Benchmark]: TraceAbstraction took 1509.03 ms. Allocated memory is still 202.9 MB. Free memory was 170.6 MB in the beginning and 113.9 MB in the end (delta: 56.6 MB). Peak memory consumption was 56.6 MB. Max. memory is 7.1 GB. [2020-09-04 13:23:12,687 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 146.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 366.62 ms. Allocated memory is still 146.3 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.20 ms. Allocated memory is still 146.3 MB. Free memory was 92.1 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 389.68 ms. Allocated memory was 146.3 MB in the beginning and 202.9 MB in the end (delta: 56.6 MB). Free memory was 90.8 MB in the beginning and 171.2 MB in the end (delta: -80.4 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1509.03 ms. Allocated memory is still 202.9 MB. Free memory was 170.6 MB in the beginning and 113.9 MB in the end (delta: 56.6 MB). Peak memory consumption was 56.6 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: 1.3s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 65 SDs, 0 SdLazy, 48 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 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, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 76 NumberOfCodeBlocks, 76 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1536 SizeOfPredicates, 3 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 4/8 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...