/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_non_eq-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 18:56:23,495 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 18:56:23,501 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 18:56:23,528 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 18:56:23,528 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 18:56:23,530 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 18:56:23,531 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 18:56:23,533 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 18:56:23,535 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 18:56:23,536 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 18:56:23,537 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 18:56:23,538 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 18:56:23,538 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 18:56:23,539 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 18:56:23,540 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 18:56:23,541 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 18:56:23,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 18:56:23,543 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 18:56:23,545 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 18:56:23,547 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 18:56:23,548 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 18:56:23,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 18:56:23,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 18:56:23,552 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 18:56:23,554 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 18:56:23,555 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 18:56:23,555 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 18:56:23,556 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 18:56:23,556 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 18:56:23,557 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 18:56:23,557 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 18:56:23,558 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 18:56:23,559 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 18:56:23,560 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 18:56:23,560 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 18:56:23,561 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 18:56:23,561 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 18:56:23,561 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 18:56:23,565 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 18:56:23,566 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 18:56:23,567 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 18:56:23,568 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 18:56:23,592 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 18:56:23,595 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 18:56:23,597 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 18:56:23,597 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 18:56:23,597 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 18:56:23,598 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 18:56:23,598 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 18:56:23,598 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 18:56:23,598 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 18:56:23,598 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 18:56:23,599 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 18:56:23,599 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 18:56:23,599 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 18:56:23,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 18:56:23,599 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 18:56:23,600 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 18:56:23,603 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 18:56:23,603 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 18:56:23,603 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 18:56:23,606 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 18:56:23,606 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 18:56:23,606 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 18:56:23,606 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 18:56:23,961 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 18:56:23,979 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 18:56:23,982 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 18:56:23,984 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 18:56:23,985 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 18:56:23,986 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_non_eq-2.c [2020-08-22 18:56:24,076 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/637ecb0b4/c310af9139f442c183d7a49959a69692/FLAG8f450ca6a [2020-08-22 18:56:24,628 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 18:56:24,629 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_non_eq-2.c [2020-08-22 18:56:24,636 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/637ecb0b4/c310af9139f442c183d7a49959a69692/FLAG8f450ca6a [2020-08-22 18:56:25,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/637ecb0b4/c310af9139f442c183d7a49959a69692 [2020-08-22 18:56:25,028 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 18:56:25,030 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 18:56:25,031 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 18:56:25,032 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 18:56:25,036 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 18:56:25,037 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,041 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@632ac694 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25, skipping insertion in model container [2020-08-22 18:56:25,041 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,050 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 18:56:25,069 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 18:56:25,251 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:56:25,257 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 18:56:25,275 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:56:25,292 INFO L208 MainTranslator]: Completed translation [2020-08-22 18:56:25,297 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25 WrapperNode [2020-08-22 18:56:25,297 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 18:56:25,298 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 18:56:25,298 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 18:56:25,298 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 18:56:25,315 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,315 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,321 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,322 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,326 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,329 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,330 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (1/1) ... [2020-08-22 18:56:25,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 18:56:25,332 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 18:56:25,333 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 18:56:25,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 18:56:25,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (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 [2020-08-22 18:56:25,503 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 18:56:25,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 18:56:25,504 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-22 18:56:25,504 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 18:56:25,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 18:56:25,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 18:56:25,504 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-22 18:56:25,504 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 18:56:25,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 18:56:25,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 18:56:25,766 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 18:56:25,766 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 18:56:25,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:56:25 BoogieIcfgContainer [2020-08-22 18:56:25,773 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 18:56:25,775 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 18:56:25,775 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 18:56:25,779 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 18:56:25,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:56:25" (1/3) ... [2020-08-22 18:56:25,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cd51292 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:56:25, skipping insertion in model container [2020-08-22 18:56:25,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:56:25" (2/3) ... [2020-08-22 18:56:25,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cd51292 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:56:25, skipping insertion in model container [2020-08-22 18:56:25,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:56:25" (3/3) ... [2020-08-22 18:56:25,783 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_non_eq-2.c [2020-08-22 18:56:25,798 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 18:56:25,809 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 18:56:25,829 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 18:56:25,859 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 18:56:25,859 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 18:56:25,859 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 18:56:25,860 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 18:56:25,860 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 18:56:25,860 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 18:56:25,860 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 18:56:25,861 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 18:56:25,899 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-22 18:56:25,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 18:56:25,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:56:25,917 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:56:25,917 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:56:25,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:56:25,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1061236160, now seen corresponding path program 1 times [2020-08-22 18:56:25,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:56:25,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551628130] [2020-08-22 18:56:25,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:56:25,999 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:56:26,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:56:26,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 18:56:26,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:56:26,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-22 18:56:26,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:56:26,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 18:56:26,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551628130] [2020-08-22 18:56:26,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 18:56:26,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-22 18:56:26,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942279284] [2020-08-22 18:56:26,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 18:56:26,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 18:56:26,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 18:56:26,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 18:56:26,475 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 8 states. [2020-08-22 18:56:26,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 18:56:26,743 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-08-22 18:56:26,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 18:56:26,747 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-08-22 18:56:26,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 18:56:26,762 INFO L225 Difference]: With dead ends: 40 [2020-08-22 18:56:26,762 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 18:56:26,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-22 18:56:26,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 18:56:26,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 18:56:26,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 18:56:26,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-22 18:56:26,845 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2020-08-22 18:56:26,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 18:56:26,847 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-22 18:56:26,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 18:56:26,847 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-22 18:56:26,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 18:56:26,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:56:26,860 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:56:26,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 18:56:26,862 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:56:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:56:26,863 INFO L82 PathProgramCache]: Analyzing trace with hash 964161843, now seen corresponding path program 1 times [2020-08-22 18:56:26,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:56:26,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874081414] [2020-08-22 18:56:26,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:56:27,010 INFO L278 leratedInterpolation]: Starting analysis with loop acceleration approximation PRECISE [2020-08-22 18:56:27,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:56:27,034 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:56:27,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:56:27,049 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:56:27,071 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 18:56:27,072 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 18:56:27,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 18:56:27,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:56:27 BoogieIcfgContainer [2020-08-22 18:56:27,090 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 18:56:27,094 INFO L168 Benchmark]: Toolchain (without parser) took 2063.02 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 103.9 MB in the beginning and 108.2 MB in the end (delta: -4.3 MB). Peak memory consumption was 57.6 MB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,095 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 140.0 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,096 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.28 ms. Allocated memory is still 140.0 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,097 INFO L168 Benchmark]: Boogie Preprocessor took 33.81 ms. Allocated memory is still 140.0 MB. Free memory was 94.4 MB in the beginning and 93.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,098 INFO L168 Benchmark]: RCFGBuilder took 440.44 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 93.1 MB in the beginning and 169.6 MB in the end (delta: -76.5 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,099 INFO L168 Benchmark]: TraceAbstraction took 1315.97 ms. Allocated memory is still 201.9 MB. Free memory was 169.6 MB in the beginning and 108.2 MB in the end (delta: 61.4 MB). Peak memory consumption was 61.4 MB. Max. memory is 7.1 GB. [2020-08-22 18:56:27,104 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 140.0 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 266.28 ms. Allocated memory is still 140.0 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.81 ms. Allocated memory is still 140.0 MB. Free memory was 94.4 MB in the beginning and 93.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 440.44 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 93.1 MB in the beginning and 169.6 MB in the end (delta: -76.5 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1315.97 ms. Allocated memory is still 201.9 MB. Free memory was 169.6 MB in the beginning and 108.2 MB in the end (delta: 61.4 MB). Peak memory consumption was 61.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int a = __VERIFIER_nondet_uint(); [L14] unsigned int b = __VERIFIER_nondet_uint(); [L15] CALL, EXPR sum(a, b) [L5] COND FALSE !(n == 0) [L8] CALL, EXPR sum(n - 1, m + 1) [L5] COND TRUE n == 0 [L6] return m; [L8] RET, EXPR sum(n - 1, m + 1) [L8] return sum(n - 1, m + 1); [L15] RET, EXPR sum(a, b) [L15] unsigned int result = sum(a, b); [L16] COND TRUE result != a + b [L17] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.2s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 21 SDtfs, 20 SDslu, 80 SDs, 0 SdLazy, 56 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred in iteration=0, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...