/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 22:05:02,314 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 22:05:02,316 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 22:05:02,358 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 22:05:02,382 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 22:05:02,385 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 22:05:02,387 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 22:05:02,388 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 22:05:02,388 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 22:05:02,389 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 22:05:02,391 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 22:05:02,392 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 22:05:02,393 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 22:05:02,394 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 22:05:02,395 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 22:05:02,396 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 22:05:02,398 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 22:05:02,405 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 22:05:02,405 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 22:05:02,406 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 22:05:02,407 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 22:05:02,416 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 22:05:02,417 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 22:05:02,418 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 22:05:02,418 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 22:05:02,418 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 22:05:02,418 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 22:05:02,419 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 22:05:02,419 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 22:05:02,419 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 22:05:02,419 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 22:05:02,419 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 22:05:02,420 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 22:05:02,420 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 22:05:02,420 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 22:05:02,420 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 22:05:02,420 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 22:05:02,420 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 22:05:02,421 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 22:05:02,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:05:02,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 22:05:02,421 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 22:05:02,421 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 22:05:02,422 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 22:05:02,690 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 22:05:02,707 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 22:05:02,713 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 22:05:02,714 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 22:05:02,715 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 22:05:02,715 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-22 22:05:02,779 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a3dba80d/a6c22e47493240c798f0e9c8bce17d35/FLAG1d09244f2 [2020-08-22 22:05:03,153 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 22:05:03,154 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-22 22:05:03,161 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a3dba80d/a6c22e47493240c798f0e9c8bce17d35/FLAG1d09244f2 [2020-08-22 22:05:03,531 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a3dba80d/a6c22e47493240c798f0e9c8bce17d35 [2020-08-22 22:05:03,543 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 22:05:03,547 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 22:05:03,549 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 22:05:03,549 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 22:05:03,553 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 22:05:03,554 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,559 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4490e9f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03, skipping insertion in model container [2020-08-22 22:05:03,559 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,571 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 22:05:03,597 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 22:05:03,821 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:05:03,831 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 22:05:03,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:05:03,866 INFO L208 MainTranslator]: Completed translation [2020-08-22 22:05:03,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03 WrapperNode [2020-08-22 22:05:03,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 22:05:03,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 22:05:03,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 22:05:03,868 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 22:05:03,882 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,882 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,888 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,888 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,968 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,972 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (1/1) ... [2020-08-22 22:05:03,974 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 22:05:03,974 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 22:05:03,975 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 22:05:03,975 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 22:05:03,976 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (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 22:05:04,033 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 22:05:04,034 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 22:05:04,034 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-08-22 22:05:04,034 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-08-22 22:05:04,034 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 22:05:04,034 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 22:05:04,034 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 22:05:04,034 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-08-22 22:05:04,035 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-08-22 22:05:04,035 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 22:05:04,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 22:05:04,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 22:05:04,241 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 22:05:04,241 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 22:05:04,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:05:04 BoogieIcfgContainer [2020-08-22 22:05:04,246 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 22:05:04,247 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 22:05:04,247 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 22:05:04,250 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 22:05:04,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 10:05:03" (1/3) ... [2020-08-22 22:05:04,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@720fd89a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:05:04, skipping insertion in model container [2020-08-22 22:05:04,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:05:03" (2/3) ... [2020-08-22 22:05:04,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@720fd89a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:05:04, skipping insertion in model container [2020-08-22 22:05:04,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:05:04" (3/3) ... [2020-08-22 22:05:04,254 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-08-22 22:05:04,265 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 22:05:04,273 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 22:05:04,288 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 22:05:04,320 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 22:05:04,320 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 22:05:04,320 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 22:05:04,320 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 22:05:04,321 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 22:05:04,321 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 22:05:04,321 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 22:05:04,321 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 22:05:04,352 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-08-22 22:05:04,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 22:05:04,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:05:04,368 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:05:04,369 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:05:04,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:05:04,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-08-22 22:05:04,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:05:04,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940920009] [2020-08-22 22:05:04,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:05:04,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:05:04,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:05:04,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,601 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 22:05:04,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940920009] [2020-08-22 22:05:04,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:05:04,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:05:04,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201619026] [2020-08-22 22:05:04,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:05:04,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:05:04,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:05:04,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:05:04,623 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-08-22 22:05:04,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:05:04,750 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-08-22 22:05:04,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:05:04,753 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-22 22:05:04,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:05:04,764 INFO L225 Difference]: With dead ends: 58 [2020-08-22 22:05:04,764 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 22:05:04,768 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 22:05:04,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 22:05:04,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 22:05:04,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 22:05:04,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-08-22 22:05:04,823 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-08-22 22:05:04,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:05:04,824 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-08-22 22:05:04,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:05:04,825 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-08-22 22:05:04,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 22:05:04,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:05:04,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:05:04,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 22:05:04,828 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:05:04,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:05:04,829 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-08-22 22:05:04,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:05:04,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206564308] [2020-08-22 22:05:04,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:05:04,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:05:04,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:05:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:04,898 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 22:05:04,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206564308] [2020-08-22 22:05:04,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:05:04,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:05:04,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329688677] [2020-08-22 22:05:04,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:05:04,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:05:04,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:05:04,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:05:04,903 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-08-22 22:05:04,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:05:04,973 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-22 22:05:04,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:05:04,974 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 22:05:04,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:05:04,976 INFO L225 Difference]: With dead ends: 50 [2020-08-22 22:05:04,976 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 22:05:04,977 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 22:05:04,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 22:05:04,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-08-22 22:05:04,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 22:05:04,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-08-22 22:05:04,991 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-08-22 22:05:04,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:05:04,991 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-08-22 22:05:04,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:05:04,992 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-08-22 22:05:04,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 22:05:04,993 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:05:04,994 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:05:04,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 22:05:04,994 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:05:04,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:05:04,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-08-22 22:05:04,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:05:04,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108927065] [2020-08-22 22:05:04,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:05:05,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:05,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:05:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:05,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-22 22:05:05,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:05,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:05:05,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:05,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 22:05:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:05:05,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:05:05,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108927065] [2020-08-22 22:05:05,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:05:05,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 22:05:05,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988219600] [2020-08-22 22:05:05,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:05:05,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:05:05,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:05:05,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:05:05,148 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-08-22 22:05:05,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:05:05,239 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-08-22 22:05:05,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 22:05:05,240 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-08-22 22:05:05,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:05:05,242 INFO L225 Difference]: With dead ends: 82 [2020-08-22 22:05:05,242 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 22:05:05,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:05:05,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 22:05:05,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-08-22 22:05:05,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 22:05:05,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-08-22 22:05:05,259 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-08-22 22:05:05,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:05:05,260 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-08-22 22:05:05,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:05:05,260 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-08-22 22:05:05,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 22:05:05,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:05:05,263 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:05:05,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 22:05:05,264 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:05:05,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:05:05,264 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-08-22 22:05:05,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:05:05,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960962973] [2020-08-22 22:05:05,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:05:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:05:05,281 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:05:05,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:05:05,293 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:05:05,313 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 22:05:05,314 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 22:05:05,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 22:05:05,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 10:05:05 BoogieIcfgContainer [2020-08-22 22:05:05,353 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 22:05:05,356 INFO L168 Benchmark]: Toolchain (without parser) took 1808.73 ms. Allocated memory was 140.0 MB in the beginning and 203.4 MB in the end (delta: 63.4 MB). Free memory was 103.4 MB in the beginning and 98.2 MB in the end (delta: 5.2 MB). Peak memory consumption was 68.7 MB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,357 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 140.0 MB. Free memory was 121.3 MB in the beginning and 121.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,358 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.26 ms. Allocated memory is still 140.0 MB. Free memory was 103.2 MB in the beginning and 93.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,359 INFO L168 Benchmark]: Boogie Preprocessor took 106.35 ms. Allocated memory was 140.0 MB in the beginning and 203.4 MB in the end (delta: 63.4 MB). Free memory was 93.5 MB in the beginning and 182.6 MB in the end (delta: -89.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,360 INFO L168 Benchmark]: RCFGBuilder took 271.69 ms. Allocated memory is still 203.4 MB. Free memory was 182.6 MB in the beginning and 168.0 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,361 INFO L168 Benchmark]: TraceAbstraction took 1106.13 ms. Allocated memory is still 203.4 MB. Free memory was 167.4 MB in the beginning and 98.2 MB in the end (delta: 69.2 MB). Peak memory consumption was 69.2 MB. Max. memory is 7.1 GB. [2020-08-22 22:05:05,365 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 140.0 MB. Free memory was 121.3 MB in the beginning and 121.0 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 318.26 ms. Allocated memory is still 140.0 MB. Free memory was 103.2 MB in the beginning and 93.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 106.35 ms. Allocated memory was 140.0 MB in the beginning and 203.4 MB in the end (delta: 63.4 MB). Free memory was 93.5 MB in the beginning and 182.6 MB in the end (delta: -89.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 271.69 ms. Allocated memory is still 203.4 MB. Free memory was 182.6 MB in the beginning and 168.0 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1106.13 ms. Allocated memory is still 203.4 MB. Free memory was 167.4 MB in the beginning and 98.2 MB in the end (delta: 69.2 MB). Peak memory consumption was 69.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; VAL [x=2] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); VAL [\old(n)=2, \result=1, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L37] int result = fibo1(x); VAL [fibo1(x)=1, result=1, x=2] [L38] COND TRUE result == 1 VAL [result=1, x=2] [L39] __VERIFIER_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 126 SDtfs, 72 SDslu, 322 SDs, 0 SdLazy, 106 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred 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, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 100 NumberOfCodeBlocks, 100 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 63 ConstructedInterpolants, 0 QuantifiedInterpolants, 2295 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 1/5 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...