/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:00:06,675 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:00:06,678 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:00:06,701 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:00:06,702 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:00:06,703 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:00:06,704 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:00:06,706 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:00:06,708 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:00:06,709 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:00:06,710 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:00:06,711 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:00:06,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:00:06,712 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:00:06,713 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:00:06,714 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:00:06,715 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:00:06,716 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:00:06,718 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:00:06,719 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:00:06,721 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:00:06,722 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:00:06,723 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:00:06,724 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:00:06,726 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 06:00:06,726 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 06:00:06,726 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 06:00:06,727 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 06:00:06,728 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 06:00:06,729 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 06:00:06,729 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 06:00:06,730 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 06:00:06,730 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 06:00:06,731 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 06:00:06,732 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 06:00:06,732 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 06:00:06,733 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 06:00:06,733 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 06:00:06,733 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:00:06,734 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:00:06,735 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:00:06,736 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 [2020-08-19 06:00:06,768 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:00:06,768 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:00:06,771 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:00:06,771 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:00:06,772 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:00:06,772 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:00:06,772 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:00:06,772 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:00:06,773 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:00:06,774 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:00:06,774 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:00:06,774 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:00:06,774 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:00:06,774 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:00:06,775 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:00:06,776 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:00:06,776 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:00:06,776 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:00:06,777 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:00:06,777 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:00:06,777 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:00:06,777 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:00:06,778 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:00:06,778 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:00:06,778 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; [2020-08-19 06:00:07,108 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:00:07,127 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:00:07,134 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:00:07,137 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:00:07,137 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:00:07,138 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-19 06:00:07,215 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/810456f7e/eb334a8ccbd348cda5edd965be8c862e/FLAG0e04a46b7 [2020-08-19 06:00:07,637 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:00:07,638 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-19 06:00:07,644 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/810456f7e/eb334a8ccbd348cda5edd965be8c862e/FLAG0e04a46b7 [2020-08-19 06:00:08,029 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/810456f7e/eb334a8ccbd348cda5edd965be8c862e [2020-08-19 06:00:08,039 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:00:08,041 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:00:08,042 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:00:08,042 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:00:08,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:00:08,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,051 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cc704b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08, skipping insertion in model container [2020-08-19 06:00:08,051 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,059 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:00:08,081 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:00:08,307 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:00:08,316 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:00:08,337 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:00:08,354 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:00:08,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08 WrapperNode [2020-08-19 06:00:08,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:00:08,356 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:00:08,356 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:00:08,356 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:00:08,371 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,373 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,478 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,481 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,483 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (1/1) ... [2020-08-19 06:00:08,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:00:08,485 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:00:08,485 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:00:08,485 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:00:08,486 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (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 [2020-08-19 06:00:08,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:00:08,557 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:00:08,557 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-19 06:00:08,557 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:00:08,557 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:00:08,557 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-19 06:00:08,558 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:00:08,558 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:00:08,558 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:00:08,721 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:00:08,722 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 06:00:08,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:00:08 BoogieIcfgContainer [2020-08-19 06:00:08,726 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:00:08,727 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:00:08,727 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:00:08,731 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:00:08,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:00:08" (1/3) ... [2020-08-19 06:00:08,732 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@192fbfdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:00:08, skipping insertion in model container [2020-08-19 06:00:08,732 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:00:08" (2/3) ... [2020-08-19 06:00:08,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@192fbfdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:00:08, skipping insertion in model container [2020-08-19 06:00:08,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:00:08" (3/3) ... [2020-08-19 06:00:08,735 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-19 06:00:08,746 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:00:08,753 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:00:08,769 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:00:08,793 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:00:08,793 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:00:08,794 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:00:08,794 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:00:08,794 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:00:08,794 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:00:08,794 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:00:08,795 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:00:08,813 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-19 06:00:08,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 06:00:08,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:00:08,821 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:00:08,821 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:00:08,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:00:08,828 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-19 06:00:08,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:00:08,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301340125] [2020-08-19 06:00:08,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:00:08,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:00:09,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:00:09,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:00:09,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301340125] [2020-08-19 06:00:09,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:00:09,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:00:09,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766592067] [2020-08-19 06:00:09,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:00:09,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:00:09,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:00:09,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:00:09,079 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-19 06:00:09,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:00:09,231 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-19 06:00:09,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:00:09,233 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 06:00:09,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:00:09,253 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:00:09,253 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 06:00:09,260 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 [2020-08-19 06:00:09,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 06:00:09,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 06:00:09,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 06:00:09,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-19 06:00:09,304 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-19 06:00:09,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:00:09,304 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-19 06:00:09,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:00:09,305 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-19 06:00:09,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:00:09,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:00:09,307 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:00:09,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:00:09,308 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:00:09,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:00:09,308 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-19 06:00:09,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:00:09,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127141550] [2020-08-19 06:00:09,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:00:09,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:00:09,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 06:00:09,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-19 06:00:09,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:00:09,457 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-19 06:00:09,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127141550] [2020-08-19 06:00:09,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:00:09,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:00:09,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643865417] [2020-08-19 06:00:09,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:00:09,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:00:09,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:00:09,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:00:09,462 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-19 06:00:09,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:00:09,537 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-19 06:00:09,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:00:09,538 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 06:00:09,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:00:09,540 INFO L225 Difference]: With dead ends: 25 [2020-08-19 06:00:09,540 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 06:00:09,541 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 [2020-08-19 06:00:09,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 06:00:09,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 06:00:09,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 06:00:09,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 06:00:09,548 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-19 06:00:09,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:00:09,549 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 06:00:09,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:00:09,549 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 06:00:09,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 06:00:09,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:00:09,551 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:00:09,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:00:09,552 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:00:09,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:00:09,552 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-19 06:00:09,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:00:09,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576150110] [2020-08-19 06:00:09,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:00:09,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 06:00:09,578 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 06:00:09,578 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 06:00:09,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:00:09,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 06:00:09 BoogieIcfgContainer [2020-08-19 06:00:09,617 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 06:00:09,620 INFO L168 Benchmark]: Toolchain (without parser) took 1578.61 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 102.9 MB in the beginning and 125.7 MB in the end (delta: -22.8 MB). Peak memory consumption was 33.3 MB. Max. memory is 7.1 GB. [2020-08-19 06:00:09,621 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 06:00:09,622 INFO L168 Benchmark]: CACSL2BoogieTranslator took 313.57 ms. Allocated memory is still 147.8 MB. Free memory was 102.5 MB in the beginning and 93.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-08-19 06:00:09,623 INFO L168 Benchmark]: Boogie Preprocessor took 128.61 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 93.4 MB in the beginning and 182.7 MB in the end (delta: -89.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-19 06:00:09,624 INFO L168 Benchmark]: RCFGBuilder took 240.69 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 171.2 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-19 06:00:09,625 INFO L168 Benchmark]: TraceAbstraction took 890.55 ms. Allocated memory is still 203.9 MB. Free memory was 170.5 MB in the beginning and 125.7 MB in the end (delta: 44.8 MB). Peak memory consumption was 44.8 MB. Max. memory is 7.1 GB. [2020-08-19 06:00:09,629 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 313.57 ms. Allocated memory is still 147.8 MB. Free memory was 102.5 MB in the beginning and 93.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.61 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 93.4 MB in the beginning and 182.7 MB in the end (delta: -89.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 240.69 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 171.2 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 890.55 ms. Allocated memory is still 203.9 MB. Free memory was 170.5 MB in the beginning and 125.7 MB in the end (delta: 44.8 MB). Peak memory consumption was 44.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 58 SDs, 0 SdLazy, 44 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s 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...