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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 03:11:57,579 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 03:11:57,581 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 03:11:57,593 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-10 03:11:57,602 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-10 03:11:57,602 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-10 03:11:57,603 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-10 03:11:57,604 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-10 03:11:57,605 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-10 03:11:57,606 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-10 03:11:57,608 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-10 03:11:57,609 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-10 03:11:57,611 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-10 03:11:57,612 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-10 03:11:57,613 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-10 03:11:57,614 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-10 03:11:57,616 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-10 03:11:57,626 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-10 03:11:57,628 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-10 03:11:57,629 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-10 03:11:57,630 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 03:11:57,656 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 03:11:57,656 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 03:11:57,656 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 03:11:57,657 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 03:11:57,657 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 03:11:57,657 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 03:11:57,658 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 03:11:57,658 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 03:11:57,658 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 03:11:57,659 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 03:11:57,660 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 03:11:57,660 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 03:11:57,660 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 03:11:57,660 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 03:11:57,661 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 03:11:57,661 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 03:11:57,661 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 03:11:57,662 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 03:11:57,662 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 03:11:57,662 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 03:11:57,662 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 03:11:57,663 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 03:11:57,663 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 03:11:57,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 03:11:57,663 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 03:11:57,663 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 03:11:57,664 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 03:11:57,664 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 03:11:57,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 03:11:57,664 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 03:11:57,702 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 03:11:57,714 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 03:11:57,717 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 03:11:57,718 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 03:11:57,718 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 03:11:57,719 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2019-09-10 03:11:57,775 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6743cab4/15bfe51765704d01bcf8429e44576dd6/FLAG9dd8f7815 [2019-09-10 03:11:58,202 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 03:11:58,203 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2019-09-10 03:11:58,208 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6743cab4/15bfe51765704d01bcf8429e44576dd6/FLAG9dd8f7815 [2019-09-10 03:11:58,601 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6743cab4/15bfe51765704d01bcf8429e44576dd6 [2019-09-10 03:11:58,609 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 03:11:58,611 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 03:11:58,612 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 03:11:58,612 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 03:11:58,615 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 03:11:58,616 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51fffac3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58, skipping insertion in model container [2019-09-10 03:11:58,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,626 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 03:11:58,642 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 03:11:58,815 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 03:11:58,820 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 03:11:58,840 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 03:11:58,858 INFO L192 MainTranslator]: Completed translation [2019-09-10 03:11:58,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58 WrapperNode [2019-09-10 03:11:58,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 03:11:58,859 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 03:11:58,859 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 03:11:58,859 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 03:11:58,873 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,873 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,894 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,894 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,900 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,901 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (1/1) ... [2019-09-10 03:11:58,902 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 03:11:58,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 03:11:58,903 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 03:11:58,903 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 03:11:58,904 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (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 [2019-09-10 03:11:59,033 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 03:11:59,034 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 03:11:59,034 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2019-09-10 03:11:59,034 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 03:11:59,034 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 03:11:59,034 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2019-09-10 03:11:59,035 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 03:11:59,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 03:11:59,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 03:11:59,203 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 03:11:59,203 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-10 03:11:59,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 03:11:59 BoogieIcfgContainer [2019-09-10 03:11:59,204 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 03:11:59,205 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 03:11:59,205 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 03:11:59,208 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 03:11:59,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 03:11:58" (1/3) ... [2019-09-10 03:11:59,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31bc92fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 03:11:59, skipping insertion in model container [2019-09-10 03:11:59,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 03:11:58" (2/3) ... [2019-09-10 03:11:59,210 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31bc92fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 03:11:59, skipping insertion in model container [2019-09-10 03:11:59,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 03:11:59" (3/3) ... [2019-09-10 03:11:59,212 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2019-09-10 03:11:59,221 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 03:11:59,228 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 03:11:59,244 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 03:11:59,270 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 03:11:59,270 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 03:11:59,270 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 03:11:59,270 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 03:11:59,270 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 03:11:59,271 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 03:11:59,271 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 03:11:59,271 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 03:11:59,285 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-10 03:11:59,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-10 03:11:59,295 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:11:59,296 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:11:59,298 INFO L418 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:11:59,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:11:59,303 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2019-09-10 03:11:59,305 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:11:59,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:11:59,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:11:59,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:11:59,347 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:11:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:11:59,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 03:11:59,484 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 03:11:59,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 03:11:59,485 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 03:11:59,489 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 03:11:59,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 03:11:59,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 03:11:59,507 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2019-09-10 03:11:59,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:11:59,623 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2019-09-10 03:11:59,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 03:11:59,628 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-09-10 03:11:59,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:11:59,639 INFO L225 Difference]: With dead ends: 22 [2019-09-10 03:11:59,639 INFO L226 Difference]: Without dead ends: 18 [2019-09-10 03:11:59,641 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 03:11:59,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-09-10 03:11:59,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-09-10 03:11:59,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-10 03:11:59,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-10 03:11:59,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-09-10 03:11:59,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:11:59,696 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-10 03:11:59,696 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 03:11:59,696 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-10 03:11:59,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-10 03:11:59,698 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:11:59,698 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:11:59,698 INFO L418 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:11:59,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:11:59,699 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2019-09-10 03:11:59,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:11:59,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:11:59,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:11:59,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:11:59,701 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:11:59,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:11:59,800 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-10 03:11:59,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:11:59,802 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 03:11:59,802 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2019-09-10 03:11:59,804 INFO L207 CegarAbsIntRunner]: [0], [4], [7], [8], [10], [11], [12], [14], [17], [19], [25], [26], [27], [29], [30], [31], [32] [2019-09-10 03:11:59,837 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 03:11:59,838 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 03:11:59,932 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-10 03:11:59,934 INFO L272 AbstractInterpreter]: Visited 17 different actions 28 times. Never merged. Never widened. Performed 32 root evaluator evaluations with a maximum evaluation depth of 3. Performed 32 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 6 variables. [2019-09-10 03:11:59,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:11:59,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-10 03:11:59,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 03:11:59,939 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 03:11:59,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:11:59,969 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 03:12:00,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 03:12:00,008 INFO L256 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-10 03:12:00,014 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 03:12:00,046 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-09-10 03:12:00,047 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 03:12:00,211 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 03:12:00,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-10 03:12:00,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 03:12:00,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 8 [2019-09-10 03:12:00,261 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 03:12:00,262 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-10 03:12:00,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-10 03:12:00,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-09-10 03:12:00,263 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2019-09-10 03:12:00,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 03:12:00,347 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-09-10 03:12:00,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-10 03:12:00,347 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-09-10 03:12:00,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 03:12:00,349 INFO L225 Difference]: With dead ends: 21 [2019-09-10 03:12:00,349 INFO L226 Difference]: Without dead ends: 21 [2019-09-10 03:12:00,350 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-09-10 03:12:00,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-09-10 03:12:00,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-09-10 03:12:00,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-10 03:12:00,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-09-10 03:12:00,361 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2019-09-10 03:12:00,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 03:12:00,363 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-09-10 03:12:00,363 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-10 03:12:00,363 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-09-10 03:12:00,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-10 03:12:00,365 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 03:12:00,365 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 03:12:00,366 INFO L418 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 03:12:00,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 03:12:00,366 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2019-09-10 03:12:00,367 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 03:12:00,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:12:00,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 03:12:00,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 03:12:00,372 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 03:12:00,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-10 03:12:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-10 03:12:00,472 INFO L466 BasicCegarLoop]: Counterexample might be feasible [2019-09-10 03:12:00,497 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 03:12:00 BoogieIcfgContainer [2019-09-10 03:12:00,498 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-10 03:12:00,500 INFO L168 Benchmark]: Toolchain (without parser) took 1888.59 ms. Allocated memory was 135.8 MB in the beginning and 210.8 MB in the end (delta: 75.0 MB). Free memory was 90.9 MB in the beginning and 107.8 MB in the end (delta: -16.9 MB). Peak memory consumption was 58.1 MB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,501 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 135.8 MB. Free memory was 109.0 MB in the beginning and 108.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,502 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.03 ms. Allocated memory is still 135.8 MB. Free memory was 90.7 MB in the beginning and 81.8 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,504 INFO L168 Benchmark]: Boogie Preprocessor took 43.05 ms. Allocated memory was 135.8 MB in the beginning and 168.8 MB in the end (delta: 33.0 MB). Free memory was 81.8 MB in the beginning and 146.0 MB in the end (delta: -64.3 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,505 INFO L168 Benchmark]: RCFGBuilder took 302.22 ms. Allocated memory was 168.8 MB in the beginning and 210.8 MB in the end (delta: 41.9 MB). Free memory was 145.4 MB in the beginning and 183.8 MB in the end (delta: -38.3 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,506 INFO L168 Benchmark]: TraceAbstraction took 1292.40 ms. Allocated memory is still 210.8 MB. Free memory was 183.8 MB in the beginning and 107.8 MB in the end (delta: 76.0 MB). Peak memory consumption was 76.0 MB. Max. memory is 7.1 GB. [2019-09-10 03:12:00,510 INFO L335 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 135.8 MB. Free memory was 109.0 MB in the beginning and 108.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.03 ms. Allocated memory is still 135.8 MB. Free memory was 90.7 MB in the beginning and 81.8 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 43.05 ms. Allocated memory was 135.8 MB in the beginning and 168.8 MB in the end (delta: 33.0 MB). Free memory was 81.8 MB in the beginning and 146.0 MB in the end (delta: -64.3 MB). Peak memory consumption was 11.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 302.22 ms. Allocated memory was 168.8 MB in the beginning and 210.8 MB in the end (delta: 41.9 MB). Free memory was 145.4 MB in the beginning and 183.8 MB in the end (delta: -38.3 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1292.40 ms. Allocated memory is still 210.8 MB. Free memory was 183.8 MB in the beginning and 107.8 MB in the end (delta: 76.0 MB). Peak memory consumption was 76.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; 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. UNSAFE Result, 1.2s OverallTime, 3 OverallIterations, 3 TraceHistogramMax, 0.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 65 SDs, 0 SdLazy, 50 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s 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, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 76 NumberOfCodeBlocks, 76 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 66 ConstructedInterpolants, 0 QuantifiedInterpolants, 2400 SizeOfPredicates, 3 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 5/12 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...