/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:11:18,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:11:18,554 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:11:18,574 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:11:18,574 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:11:18,577 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:11:18,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:11:18,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:11:18,593 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:11:18,598 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:11:18,599 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:11:18,600 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:11:18,601 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:11:18,602 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:11:18,605 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:11:18,606 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:11:18,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:11:18,608 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:11:18,610 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:11:18,614 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:11:18,619 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:11:18,623 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:11:18,624 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:11:18,625 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:11:18,627 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:11:18,639 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:11:18,662 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:11:18,662 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:11:18,664 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:11:18,664 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:11:18,664 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:11:18,664 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:11:18,664 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:11:18,665 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:11:18,665 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:11:18,665 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:11:18,665 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:11:18,665 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:11:18,666 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:11:18,666 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:11:18,666 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:11:18,666 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:11:18,666 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:11:18,667 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:11:18,667 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:11:18,667 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:11:18,667 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:11:18,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:18,668 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:11:18,668 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:11:18,668 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:11:18,668 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:11:18,668 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:18,669 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:11:18,669 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:11:18,669 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:11:18,929 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:11:18,942 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:11:18,946 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:11:18,948 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:11:18,949 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:11:18,950 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-21 11:11:19,027 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22511a0c7/af2ebd0bf7cf456491304b8fc9bffac2/FLAG4832acc16 [2020-07-21 11:11:19,498 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:11:19,500 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-21 11:11:19,508 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22511a0c7/af2ebd0bf7cf456491304b8fc9bffac2/FLAG4832acc16 [2020-07-21 11:11:19,895 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22511a0c7/af2ebd0bf7cf456491304b8fc9bffac2 [2020-07-21 11:11:19,904 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:11:19,906 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:11:19,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:19,907 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:11:19,911 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:11:19,912 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:19" (1/1) ... [2020-07-21 11:11:19,915 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@718f445c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:19, skipping insertion in model container [2020-07-21 11:11:19,915 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:19" (1/1) ... [2020-07-21 11:11:19,922 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:11:19,938 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:11:20,107 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:20,112 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:11:20,131 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:20,146 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:11:20,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20 WrapperNode [2020-07-21 11:11:20,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:20,147 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:11:20,147 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:11:20,148 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:11:20,161 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,169 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,170 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,173 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... [2020-07-21 11:11:20,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:11:20,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:11:20,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:11:20,179 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:11:20,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:20,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:11:20,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:11:20,328 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 11:11:20,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:11:20,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:11:20,329 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 11:11:20,329 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:11:20,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:11:20,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:11:20,502 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:11:20,502 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 11:11:20,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:20 BoogieIcfgContainer [2020-07-21 11:11:20,506 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:11:20,508 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:11:20,508 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:11:20,511 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:11:20,511 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:11:19" (1/3) ... [2020-07-21 11:11:20,512 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@603c9ef2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:20, skipping insertion in model container [2020-07-21 11:11:20,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:20" (2/3) ... [2020-07-21 11:11:20,513 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@603c9ef2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:20, skipping insertion in model container [2020-07-21 11:11:20,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:20" (3/3) ... [2020-07-21 11:11:20,515 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-07-21 11:11:20,527 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:11:20,535 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:11:20,552 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:11:20,581 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:11:20,582 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:11:20,582 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:11:20,582 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:11:20,582 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:11:20,582 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:11:20,583 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:11:20,583 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:11:20,610 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 11:11:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 11:11:20,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:20,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:20,621 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:20,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:20,631 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 11:11:20,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:20,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550396624] [2020-07-21 11:11:20,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:20,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:20,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 11:11:20,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:20,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:11:20,811 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:11:20,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550396624] [2020-07-21 11:11:20,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:11:20,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:11:20,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545302772] [2020-07-21 11:11:20,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:11:20,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:20,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:11:20,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:11:20,833 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 11:11:20,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:20,934 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 11:11:20,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:11:20,936 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 11:11:20,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:20,946 INFO L225 Difference]: With dead ends: 30 [2020-07-21 11:11:20,946 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 11:11:20,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:11:20,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 11:11:20,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 11:11:20,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 11:11:20,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 11:11:20,999 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 11:11:20,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:20,999 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 11:11:21,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:11:21,000 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 11:11:21,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 11:11:21,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:21,002 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:21,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:21,218 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:21,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:21,219 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 11:11:21,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:21,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636934654] [2020-07-21 11:11:21,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:21,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:21,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:11:21,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:21,311 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:11:21,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:21,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:11:21,523 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:11:21,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636934654] [2020-07-21 11:11:21,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:21,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-21 11:11:21,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366785565] [2020-07-21 11:11:21,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:11:21,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:21,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:11:21,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:11:21,528 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-07-21 11:11:21,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:21,601 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 11:11:21,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:11:21,602 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-21 11:11:21,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:21,603 INFO L225 Difference]: With dead ends: 25 [2020-07-21 11:11:21,603 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 11:11:21,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:11:21,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 11:11:21,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 11:11:21,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 11:11:21,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 11:11:21,612 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 11:11:21,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:21,613 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 11:11:21,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:11:21,613 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 11:11:21,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:11:21,615 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:21,615 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:21,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:21,830 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:21,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:21,831 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 11:11:21,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:21,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883951652] [2020-07-21 11:11:21,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:21,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:21,880 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:21,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:21,894 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:21,925 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:11:21,928 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:11:22,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:22,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:11:22 BoogieIcfgContainer [2020-07-21 11:11:22,168 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:11:22,171 INFO L168 Benchmark]: Toolchain (without parser) took 2264.33 ms. Allocated memory was 146.3 MB in the beginning and 203.9 MB in the end (delta: 57.7 MB). Free memory was 103.4 MB in the beginning and 97.8 MB in the end (delta: 5.6 MB). Peak memory consumption was 63.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,172 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 146.3 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,173 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.59 ms. Allocated memory is still 146.3 MB. Free memory was 103.0 MB in the beginning and 93.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,174 INFO L168 Benchmark]: Boogie Preprocessor took 30.32 ms. Allocated memory is still 146.3 MB. Free memory was 93.4 MB in the beginning and 92.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,175 INFO L168 Benchmark]: RCFGBuilder took 327.43 ms. Allocated memory was 146.3 MB in the beginning and 203.9 MB in the end (delta: 57.7 MB). Free memory was 92.0 MB in the beginning and 172.3 MB in the end (delta: -80.3 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,176 INFO L168 Benchmark]: TraceAbstraction took 1660.43 ms. Allocated memory is still 203.9 MB. Free memory was 171.7 MB in the beginning and 97.8 MB in the end (delta: 73.9 MB). Peak memory consumption was 73.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:22,180 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 146.3 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.59 ms. Allocated memory is still 146.3 MB. Free memory was 103.0 MB in the beginning and 93.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.32 ms. Allocated memory is still 146.3 MB. Free memory was 93.4 MB in the beginning and 92.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 327.43 ms. Allocated memory was 146.3 MB in the beginning and 203.9 MB in the end (delta: 57.7 MB). Free memory was 92.0 MB in the beginning and 172.3 MB in the end (delta: -80.3 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1660.43 ms. Allocated memory is still 203.9 MB. Free memory was 171.7 MB in the beginning and 97.8 MB in the end (delta: 73.9 MB). Peak memory consumption was 73.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.5s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 26 SDslu, 58 SDs, 0 SdLazy, 46 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 57 NumberOfCodeBlocks, 57 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1752 SizeOfPredicates, 5 NumberOfNonLiveVariables, 92 ConjunctsInSsa, 10 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 3/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...