/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/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:28:48,704 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:28:48,708 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:28:48,736 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-09-04 16:28:48,746 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:28:48,747 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:28:48,748 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:28:48,749 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:28:48,750 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:28:48,751 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:28:48,753 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:28:48,755 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:28:48,757 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:28:48,758 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:28:48,759 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:28:48,760 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:28:48,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 16:28:48,771 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 16:28:48,772 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 16:28:48,773 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 16:28:48,774 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:28:48,786 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:28:48,786 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:28:48,788 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:28:48,788 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:28:48,788 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:28:48,788 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:28:48,789 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:28:48,789 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:28:48,789 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:28:48,789 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:28:48,790 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:28:48,790 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:28:48,790 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:28:48,790 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:28:48,790 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:28:48,791 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:28:48,791 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:28:48,791 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:28:48,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:28:48,791 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:28:48,792 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:28:48,792 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:28:48,792 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:28:49,261 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:28:49,286 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:28:49,294 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:28:49,296 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:28:49,297 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:28:49,299 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-09-04 16:28:49,409 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9fe651d35/494b8c9497744da7a4a20df71751412e/FLAGdaa81b8e8 [2020-09-04 16:28:49,995 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:28:49,996 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-09-04 16:28:50,004 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9fe651d35/494b8c9497744da7a4a20df71751412e/FLAGdaa81b8e8 [2020-09-04 16:28:50,338 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9fe651d35/494b8c9497744da7a4a20df71751412e [2020-09-04 16:28:50,356 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:28:50,360 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:28:50,366 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:28:50,367 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:28:50,371 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:28:50,373 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,378 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c096cad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50, skipping insertion in model container [2020-09-04 16:28:50,379 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,389 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:28:50,418 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:28:50,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:28:50,646 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:28:50,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:28:50,681 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:28:50,681 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50 WrapperNode [2020-09-04 16:28:50,681 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:28:50,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:28:50,682 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:28:50,682 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:28:50,699 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,704 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,705 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,709 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,711 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,713 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... [2020-09-04 16:28:50,715 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:28:50,715 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:28:50,715 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:28:50,716 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:28:50,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:28:50,881 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:28:50,881 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:28:50,882 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-09-04 16:28:50,882 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-09-04 16:28:50,882 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:28:50,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 16:28:50,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:28:50,882 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-09-04 16:28:50,882 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-09-04 16:28:50,883 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:28:50,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:28:50,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:28:51,138 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:28:51,138 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 16:28:51,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:28:51 BoogieIcfgContainer [2020-09-04 16:28:51,144 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:28:51,145 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:28:51,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:28:51,150 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:28:51,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:28:50" (1/3) ... [2020-09-04 16:28:51,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1325a303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:28:51, skipping insertion in model container [2020-09-04 16:28:51,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:28:50" (2/3) ... [2020-09-04 16:28:51,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1325a303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:28:51, skipping insertion in model container [2020-09-04 16:28:51,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:28:51" (3/3) ... [2020-09-04 16:28:51,155 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-09-04 16:28:51,168 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:28:51,179 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:28:51,200 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:28:51,231 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:28:51,232 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:28:51,232 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:28:51,232 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:28:51,232 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:28:51,232 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:28:51,233 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:28:51,233 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:28:51,249 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-09-04 16:28:51,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 16:28:51,261 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:51,262 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:28:51,262 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:51,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:51,269 INFO L82 PathProgramCache]: Analyzing trace with hash -588914908, now seen corresponding path program 1 times [2020-09-04 16:28:51,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:51,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768332846] [2020-09-04 16:28:51,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:51,358 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:51,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:28:51,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:28:51,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:28:51,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768332846] [2020-09-04 16:28:51,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:28:51,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:28:51,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876149819] [2020-09-04 16:28:51,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:28:51,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:28:51,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:28:51,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:28:51,673 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 5 states. [2020-09-04 16:28:51,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:28:51,782 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2020-09-04 16:28:51,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 16:28:51,785 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-04 16:28:51,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:28:51,798 INFO L225 Difference]: With dead ends: 46 [2020-09-04 16:28:51,798 INFO L226 Difference]: Without dead ends: 32 [2020-09-04 16:28:51,802 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 [2020-09-04 16:28:51,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-04 16:28:51,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-09-04 16:28:51,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 16:28:51,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-04 16:28:51,860 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 16 [2020-09-04 16:28:51,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:28:51,860 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-04 16:28:51,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:28:51,861 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-04 16:28:51,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-04 16:28:51,863 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:51,863 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:28:51,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:28:51,864 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:51,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:51,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1852809946, now seen corresponding path program 1 times [2020-09-04 16:28:51,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:51,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697499887] [2020-09-04 16:28:51,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:51,868 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:28:51,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:28:51,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:51,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:51,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:28:52,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697499887] [2020-09-04 16:28:52,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:28:52,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:28:52,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880777089] [2020-09-04 16:28:52,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:28:52,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:28:52,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:28:52,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:28:52,027 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2020-09-04 16:28:52,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:28:52,156 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-09-04 16:28:52,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 16:28:52,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-09-04 16:28:52,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:28:52,160 INFO L225 Difference]: With dead ends: 45 [2020-09-04 16:28:52,160 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 16:28:52,162 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:28:52,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 16:28:52,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 16:28:52,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 16:28:52,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-09-04 16:28:52,176 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 24 [2020-09-04 16:28:52,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:28:52,177 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-09-04 16:28:52,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:28:52,177 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-09-04 16:28:52,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-04 16:28:52,179 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:52,179 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] [2020-09-04 16:28:52,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:28:52,180 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:52,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:52,181 INFO L82 PathProgramCache]: Analyzing trace with hash -238705980, now seen corresponding path program 1 times [2020-09-04 16:28:52,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:52,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157839265] [2020-09-04 16:28:52,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:52,207 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:52,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:28:52,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:28:52,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,367 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 16:28:52,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157839265] [2020-09-04 16:28:52,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:28:52,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:28:52,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418146982] [2020-09-04 16:28:52,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:28:52,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:28:52,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:28:52,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:28:52,371 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 8 states. [2020-09-04 16:28:52,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:28:52,484 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-09-04 16:28:52,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 16:28:52,485 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-09-04 16:28:52,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:28:52,487 INFO L225 Difference]: With dead ends: 55 [2020-09-04 16:28:52,487 INFO L226 Difference]: Without dead ends: 49 [2020-09-04 16:28:52,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:28:52,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-04 16:28:52,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-09-04 16:28:52,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:28:52,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-09-04 16:28:52,503 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 32 [2020-09-04 16:28:52,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:28:52,504 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-09-04 16:28:52,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:28:52,504 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-09-04 16:28:52,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-04 16:28:52,506 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:52,506 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:28:52,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:28:52,507 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:52,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:52,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2006293766, now seen corresponding path program 1 times [2020-09-04 16:28:52,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:52,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905865369] [2020-09-04 16:28:52,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:52,514 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:52,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:28:52,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:28:52,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-04 16:28:52,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905865369] [2020-09-04 16:28:52,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:28:52,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 16:28:52,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701069553] [2020-09-04 16:28:52,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 16:28:52,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:28:52,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 16:28:52,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:28:52,706 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 9 states. [2020-09-04 16:28:52,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:28:52,814 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2020-09-04 16:28:52,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 16:28:52,815 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-09-04 16:28:52,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:28:52,817 INFO L225 Difference]: With dead ends: 65 [2020-09-04 16:28:52,817 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 16:28:52,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-09-04 16:28:52,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 16:28:52,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2020-09-04 16:28:52,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-04 16:28:52,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-09-04 16:28:52,837 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 40 [2020-09-04 16:28:52,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:28:52,838 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-09-04 16:28:52,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 16:28:52,838 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-09-04 16:28:52,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-04 16:28:52,842 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:52,842 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:28:52,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:28:52,843 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:52,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:52,843 INFO L82 PathProgramCache]: Analyzing trace with hash 940355172, now seen corresponding path program 2 times [2020-09-04 16:28:52,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:52,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648150831] [2020-09-04 16:28:52,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:52,850 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:52,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:28:52,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:28:52,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:52,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:52,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:53,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:53,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:53,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:53,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:53,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:28:53,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:28:53,110 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-09-04 16:28:53,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648150831] [2020-09-04 16:28:53,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:28:53,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 16:28:53,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20579309] [2020-09-04 16:28:53,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 16:28:53,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:28:53,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 16:28:53,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-04 16:28:53,113 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 10 states. [2020-09-04 16:28:53,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:28:53,225 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2020-09-04 16:28:53,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 16:28:53,226 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 48 [2020-09-04 16:28:53,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:28:53,228 INFO L225 Difference]: With dead ends: 75 [2020-09-04 16:28:53,228 INFO L226 Difference]: Without dead ends: 69 [2020-09-04 16:28:53,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-09-04 16:28:53,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-09-04 16:28:53,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 52. [2020-09-04 16:28:53,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-04 16:28:53,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-09-04 16:28:53,243 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2020-09-04 16:28:53,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:28:53,244 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-09-04 16:28:53,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 16:28:53,244 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-09-04 16:28:53,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-04 16:28:53,246 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:28:53,246 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:28:53,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 16:28:53,246 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:28:53,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:28:53,247 INFO L82 PathProgramCache]: Analyzing trace with hash 826985242, now seen corresponding path program 2 times [2020-09-04 16:28:53,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:28:53,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289697982] [2020-09-04 16:28:53,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:28:53,254 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:28:53,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:28:53,272 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:28:53,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:28:53,288 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:28:53,342 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 16:28:53,342 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 16:28:53,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 16:28:53,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:28:53 BoogieIcfgContainer [2020-09-04 16:28:53,375 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:28:53,378 INFO L168 Benchmark]: Toolchain (without parser) took 3018.42 ms. Allocated memory was 136.8 MB in the beginning and 229.6 MB in the end (delta: 92.8 MB). Free memory was 101.1 MB in the beginning and 120.1 MB in the end (delta: -18.9 MB). Peak memory consumption was 73.9 MB. Max. memory is 7.1 GB. [2020-09-04 16:28:53,379 INFO L168 Benchmark]: CDTParser took 1.04 ms. Allocated memory is still 136.8 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 16:28:53,380 INFO L168 Benchmark]: CACSL2BoogieTranslator took 315.56 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 91.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:28:53,381 INFO L168 Benchmark]: Boogie Preprocessor took 32.63 ms. Allocated memory is still 136.8 MB. Free memory was 91.5 MB in the beginning and 90.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:28:53,382 INFO L168 Benchmark]: RCFGBuilder took 428.64 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 90.1 MB in the beginning and 167.0 MB in the end (delta: -76.8 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:28:53,383 INFO L168 Benchmark]: TraceAbstraction took 2229.51 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 166.3 MB in the beginning and 120.1 MB in the end (delta: 46.2 MB). Peak memory consumption was 75.5 MB. Max. memory is 7.1 GB. [2020-09-04 16:28:53,387 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.04 ms. Allocated memory is still 136.8 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 315.56 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 91.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.63 ms. Allocated memory is still 136.8 MB. Free memory was 91.5 MB in the beginning and 90.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 428.64 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 90.1 MB in the beginning and 167.0 MB in the end (delta: -76.8 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2229.51 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 166.3 MB in the beginning and 120.1 MB in the end (delta: 46.2 MB). Peak memory consumption was 75.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND TRUE x==0 [L13] return 0; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 132 SDtfs, 138 SDslu, 520 SDs, 0 SdLazy, 204 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 38 StatesRemovedByMinimization, 4 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...