/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:36:45,202 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:36:45,206 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:36:45,246 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 16:36:45,268 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:36:45,271 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:36:45,273 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:36:45,274 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:36:45,276 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:36:45,277 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:36:45,278 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:36:45,287 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:36:45,289 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:36:45,290 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:36:45,291 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:36:45,292 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:36:45,306 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:36:45,326 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 16:36:45,368 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:36:45,368 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:36:45,370 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:36:45,370 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:36:45,370 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:36:45,371 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:36:45,371 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:36:45,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:36:45,372 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:36:45,372 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:36:45,373 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:36:45,374 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:36:45,374 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:36:45,374 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:36:45,374 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:36:45,375 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:36:45,375 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:36:45,375 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:36:45,375 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:36:45,375 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:36:45,376 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:36:45,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:36:45,377 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:36:45,377 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:36:45,377 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:36:45,377 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:36:45,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:36:45,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:36:45,378 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:36:45,378 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:36:45,717 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:36:45,729 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:36:45,733 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:36:45,734 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:36:45,735 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:36:45,735 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 16:36:45,798 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2342d5807/cb3b2eec8c2b4f7e960078182b8b2707/FLAGebcee208a [2020-08-22 16:36:46,254 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:36:46,255 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 16:36:46,262 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2342d5807/cb3b2eec8c2b4f7e960078182b8b2707/FLAGebcee208a [2020-08-22 16:36:46,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2342d5807/cb3b2eec8c2b4f7e960078182b8b2707 [2020-08-22 16:36:46,667 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:36:46,669 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:36:46,670 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:36:46,671 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:36:46,675 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:36:46,676 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,679 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42a688b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46, skipping insertion in model container [2020-08-22 16:36:46,679 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,688 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:36:46,705 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:36:46,891 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:36:46,896 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:36:46,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:36:46,927 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:36:46,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46 WrapperNode [2020-08-22 16:36:46,928 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:36:46,929 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:36:46,929 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:36:46,929 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:36:46,941 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,943 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,948 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,948 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,954 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,957 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,958 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (1/1) ... [2020-08-22 16:36:46,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:36:46,960 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:36:46,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:36:46,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:36:46,961 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (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 16:36:47,112 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:36:47,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:36:47,113 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-22 16:36:47,113 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:36:47,113 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:36:47,113 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-22 16:36:47,113 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:36:47,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:36:47,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:36:47,272 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:36:47,272 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 16:36:47,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:36:47 BoogieIcfgContainer [2020-08-22 16:36:47,277 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:36:47,278 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:36:47,278 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:36:47,282 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:36:47,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:36:46" (1/3) ... [2020-08-22 16:36:47,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7030fba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:36:47, skipping insertion in model container [2020-08-22 16:36:47,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:36:46" (2/3) ... [2020-08-22 16:36:47,284 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7030fba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:36:47, skipping insertion in model container [2020-08-22 16:36:47,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:36:47" (3/3) ... [2020-08-22 16:36:47,286 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-22 16:36:47,297 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:36:47,305 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:36:47,322 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:36:47,351 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:36:47,352 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:36:47,352 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:36:47,352 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:36:47,352 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:36:47,352 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:36:47,353 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:36:47,353 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:36:47,383 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-22 16:36:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 16:36:47,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:47,393 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:47,393 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:47,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:47,400 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-22 16:36:47,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:47,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031877831] [2020-08-22 16:36:47,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:47,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:47,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,677 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 16:36:47,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031877831] [2020-08-22 16:36:47,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:36:47,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 16:36:47,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440095677] [2020-08-22 16:36:47,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:36:47,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:47,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:36:47,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:36:47,717 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-22 16:36:47,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:47,821 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-22 16:36:47,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:36:47,824 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 16:36:47,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:47,835 INFO L225 Difference]: With dead ends: 30 [2020-08-22 16:36:47,835 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 16:36:47,838 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 [2020-08-22 16:36:47,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 16:36:47,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 16:36:47,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 16:36:47,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-22 16:36:47,880 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-22 16:36:47,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:47,880 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-22 16:36:47,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:36:47,881 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-22 16:36:47,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 16:36:47,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:47,883 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:47,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:36:47,884 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:47,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:47,885 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-22 16:36:47,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:47,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620481010] [2020-08-22 16:36:47,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:47,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:36:47,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 16:36:47,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:47,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-22 16:36:47,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:48,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:36:48,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620481010] [2020-08-22 16:36:48,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225977636] [2020-08-22 16:36:48,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:36:48,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:36:48,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:36:48,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:36:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 16:36:48,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:36:48,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-08-22 16:36:48,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831574456] [2020-08-22 16:36:48,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:36:48,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:36:48,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:36:48,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:36:48,206 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-22 16:36:48,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:36:48,278 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-22 16:36:48,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:36:48,279 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-22 16:36:48,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:36:48,280 INFO L225 Difference]: With dead ends: 25 [2020-08-22 16:36:48,281 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 16:36:48,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:36:48,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 16:36:48,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 16:36:48,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 16:36:48,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-22 16:36:48,289 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-22 16:36:48,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:36:48,289 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-22 16:36:48,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:36:48,290 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-22 16:36:48,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 16:36:48,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:36:48,291 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:36:48,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:36:48,507 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:36:48,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:36:48,508 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-22 16:36:48,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:36:48,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395255264] [2020-08-22 16:36:48,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:36:48,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:36:48,551 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:36:48,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:36:48,575 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:36:48,592 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:36:48,592 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:36:48,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 16:36:48,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:36:48 BoogieIcfgContainer [2020-08-22 16:36:48,622 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:36:48,625 INFO L168 Benchmark]: Toolchain (without parser) took 1955.40 ms. Allocated memory was 147.3 MB in the beginning and 201.9 MB in the end (delta: 54.5 MB). Free memory was 102.5 MB in the beginning and 113.2 MB in the end (delta: -10.6 MB). Peak memory consumption was 43.9 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,626 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 147.3 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,627 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.29 ms. Allocated memory is still 147.3 MB. Free memory was 102.3 MB in the beginning and 93.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,628 INFO L168 Benchmark]: Boogie Preprocessor took 31.08 ms. Allocated memory is still 147.3 MB. Free memory was 93.0 MB in the beginning and 91.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,629 INFO L168 Benchmark]: RCFGBuilder took 316.38 ms. Allocated memory was 147.3 MB in the beginning and 201.9 MB in the end (delta: 54.5 MB). Free memory was 91.7 MB in the beginning and 170.2 MB in the end (delta: -78.5 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,630 INFO L168 Benchmark]: TraceAbstraction took 1344.12 ms. Allocated memory is still 201.9 MB. Free memory was 169.5 MB in the beginning and 113.2 MB in the end (delta: 56.4 MB). Peak memory consumption was 56.4 MB. Max. memory is 7.1 GB. [2020-08-22 16:36:48,634 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 147.3 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 258.29 ms. Allocated memory is still 147.3 MB. Free memory was 102.3 MB in the beginning and 93.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.08 ms. Allocated memory is still 147.3 MB. Free memory was 93.0 MB in the beginning and 91.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 316.38 ms. Allocated memory was 147.3 MB in the beginning and 201.9 MB in the end (delta: 54.5 MB). Free memory was 91.7 MB in the beginning and 170.2 MB in the end (delta: -78.5 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1344.12 ms. Allocated memory is still 201.9 MB. Free memory was 169.5 MB in the beginning and 113.2 MB in the end (delta: 56.4 MB). Peak memory consumption was 56.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.2s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 65 SDs, 0 SdLazy, 48 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 76 NumberOfCodeBlocks, 76 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1536 SizeOfPredicates, 3 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 4/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...