java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 02:51:29,617 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 02:51:29,620 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 02:51:29,634 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-10 02:51:29,679 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-10 02:51:29,680 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-10 02:51:29,682 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-10 02:51:29,683 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 02:51:29,698 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 02:51:29,698 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 02:51:29,699 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 02:51:29,699 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 02:51:29,700 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 02:51:29,700 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 02:51:29,700 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 02:51:29,700 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 02:51:29,701 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 02:51:29,701 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 02:51:29,702 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 02:51:29,702 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 02:51:29,702 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 02:51:29,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 02:51:29,702 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 02:51:29,703 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 02:51:29,703 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 02:51:29,703 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 02:51:29,703 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 02:51:29,703 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 02:51:29,704 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 02:51:29,704 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 02:51:29,704 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 02:51:29,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 02:51:29,705 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 02:51:29,705 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 02:51:29,705 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 02:51:29,705 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 02:51:29,705 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 02:51:29,706 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 02:51:29,734 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 02:51:29,752 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 02:51:29,757 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 02:51:29,759 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 02:51:29,760 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 02:51:29,761 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci02.c [2019-09-10 02:51:29,834 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e12d6f2a6/3823082e94964afe856e27d2e822615c/FLAGb77c13319 [2019-09-10 02:51:30,344 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 02:51:30,345 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci02.c [2019-09-10 02:51:30,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e12d6f2a6/3823082e94964afe856e27d2e822615c/FLAGb77c13319 [2019-09-10 02:51:30,743 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e12d6f2a6/3823082e94964afe856e27d2e822615c [2019-09-10 02:51:30,755 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 02:51:30,757 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 02:51:30,758 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 02:51:30,758 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 02:51:30,762 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 02:51:30,763 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:51:30" (1/1) ... [2019-09-10 02:51:30,767 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19f18e89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:30, skipping insertion in model container [2019-09-10 02:51:30,767 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:51:30" (1/1) ... [2019-09-10 02:51:30,775 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 02:51:30,795 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 02:51:31,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:51:31,022 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 02:51:31,045 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:51:31,058 INFO L192 MainTranslator]: Completed translation [2019-09-10 02:51:31,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31 WrapperNode [2019-09-10 02:51:31,059 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 02:51:31,059 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 02:51:31,059 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 02:51:31,060 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 02:51:31,170 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,185 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,185 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,192 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,193 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... [2019-09-10 02:51:31,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 02:51:31,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 02:51:31,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 02:51:31,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 02:51:31,196 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 02:51:31,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 02:51:31,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 02:51:31,262 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2019-09-10 02:51:31,262 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 02:51:31,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 02:51:31,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-10 02:51:31,263 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2019-09-10 02:51:31,263 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 02:51:31,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 02:51:31,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 02:51:31,442 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 02:51:31,443 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-10 02:51:31,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:51:31 BoogieIcfgContainer [2019-09-10 02:51:31,446 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 02:51:31,454 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 02:51:31,454 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 02:51:31,457 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 02:51:31,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 02:51:30" (1/3) ... [2019-09-10 02:51:31,459 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ae6b0c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:51:31, skipping insertion in model container [2019-09-10 02:51:31,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:51:31" (2/3) ... [2019-09-10 02:51:31,460 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ae6b0c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:51:31, skipping insertion in model container [2019-09-10 02:51:31,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:51:31" (3/3) ... [2019-09-10 02:51:31,462 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci02.c [2019-09-10 02:51:31,475 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 02:51:31,487 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 02:51:31,526 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 02:51:31,588 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 02:51:31,589 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 02:51:31,589 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 02:51:31,589 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 02:51:31,592 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 02:51:31,593 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 02:51:31,593 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 02:51:31,594 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 02:51:31,609 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-09-10 02:51:31,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-10 02:51:31,619 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:51:31,620 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:51:31,622 INFO L418 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:51:31,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:31,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2019-09-10 02:51:31,630 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:51:31,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:31,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:51:31,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:31,674 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:51:31,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:51:31,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:51:31,788 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:51:31,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 02:51:31,788 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:51:31,792 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 02:51:31,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 02:51:31,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 02:51:31,806 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2019-09-10 02:51:31,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:51:31,924 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2019-09-10 02:51:31,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 02:51:31,927 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-09-10 02:51:31,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:51:31,937 INFO L225 Difference]: With dead ends: 25 [2019-09-10 02:51:31,938 INFO L226 Difference]: Without dead ends: 21 [2019-09-10 02:51:31,940 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 02:51:31,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-09-10 02:51:31,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-09-10 02:51:31,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-10 02:51:31,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-09-10 02:51:31,984 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2019-09-10 02:51:31,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:51:31,985 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-09-10 02:51:31,985 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 02:51:31,985 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-09-10 02:51:31,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-10 02:51:31,987 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:51:31,987 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:51:31,988 INFO L418 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:51:31,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:31,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2019-09-10 02:51:31,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:51:31,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:31,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:51:31,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:31,990 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:51:31,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:51:32,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:51:32,040 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:51:32,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-10 02:51:32,043 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:51:32,044 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-10 02:51:32,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-10 02:51:32,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-10 02:51:32,046 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2019-09-10 02:51:32,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:51:32,107 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2019-09-10 02:51:32,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-10 02:51:32,108 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2019-09-10 02:51:32,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:51:32,109 INFO L225 Difference]: With dead ends: 23 [2019-09-10 02:51:32,109 INFO L226 Difference]: Without dead ends: 23 [2019-09-10 02:51:32,111 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-10 02:51:32,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-10 02:51:32,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2019-09-10 02:51:32,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-10 02:51:32,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-09-10 02:51:32,118 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2019-09-10 02:51:32,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:51:32,119 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-09-10 02:51:32,119 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-10 02:51:32,119 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-09-10 02:51:32,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-10 02:51:32,121 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:51:32,121 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:51:32,121 INFO L418 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:51:32,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:32,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2019-09-10 02:51:32,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:51:32,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:32,124 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:51:32,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:32,124 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:51:32,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:51:32,260 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-10 02:51:32,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:51:32,261 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:51:32,262 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2019-09-10 02:51:32,264 INFO L207 CegarAbsIntRunner]: [0], [3], [4], [8], [10], [12], [13], [14], [18], [20], [24], [26], [29], [30], [31], [32], [33], [34], [35], [37], [38] [2019-09-10 02:51:32,303 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:51:32,304 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:51:32,704 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-09-10 02:51:32,707 INFO L272 AbstractInterpreter]: Visited 17 different actions 791 times. Merged at 2 different actions 16 times. Widened at 2 different actions 80 times. Performed 795 root evaluator evaluations with a maximum evaluation depth of 3. Performed 795 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 48 fixpoints after 3 different actions. Largest state had 5 variables. [2019-09-10 02:51:32,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:32,711 INFO L403 sIntCurrentIteration]: Generating AbsInt predicates [2019-09-10 02:51:32,763 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2019-09-10 02:51:32,763 INFO L418 sIntCurrentIteration]: Unifying AI predicates [2019-09-10 02:51:32,794 INFO L420 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2019-09-10 02:51:32,794 INFO L429 sIntCurrentIteration]: Finished generation of AbsInt predicates [2019-09-10 02:51:32,795 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-10 02:51:32,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2019-09-10 02:51:32,795 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:51:32,796 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-10 02:51:32,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-10 02:51:32,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-09-10 02:51:32,797 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 7 states. [2019-09-10 02:51:33,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:51:33,054 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2019-09-10 02:51:33,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-10 02:51:33,054 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2019-09-10 02:51:33,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:51:33,056 INFO L225 Difference]: With dead ends: 39 [2019-09-10 02:51:33,056 INFO L226 Difference]: Without dead ends: 39 [2019-09-10 02:51:33,057 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-10 02:51:33,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-09-10 02:51:33,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2019-09-10 02:51:33,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-09-10 02:51:33,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2019-09-10 02:51:33,065 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 26 [2019-09-10 02:51:33,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:51:33,066 INFO L475 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2019-09-10 02:51:33,066 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-10 02:51:33,066 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2019-09-10 02:51:33,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-09-10 02:51:33,068 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:51:33,068 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:51:33,068 INFO L418 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:51:33,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:33,069 INFO L82 PathProgramCache]: Analyzing trace with hash 246499846, now seen corresponding path program 2 times [2019-09-10 02:51:33,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:51:33,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:33,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:51:33,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:33,070 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:51:33,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:51:33,171 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-09-10 02:51:33,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:51:33,171 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:51:33,171 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:51:33,173 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:51:33,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:51:33,173 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:51:33,199 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:51:33,200 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:51:33,218 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-10 02:51:33,219 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:51:33,220 INFO L256 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-10 02:51:33,227 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:51:33,288 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-09-10 02:51:33,288 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:51:33,416 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-10 02:51:33,487 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-09-10 02:51:33,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:51:33,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2019-09-10 02:51:33,492 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:51:33,492 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-10 02:51:33,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-10 02:51:33,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2019-09-10 02:51:33,493 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 8 states. [2019-09-10 02:51:33,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:51:33,609 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2019-09-10 02:51:33,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-10 02:51:33,609 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2019-09-10 02:51:33,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:51:33,611 INFO L225 Difference]: With dead ends: 50 [2019-09-10 02:51:33,612 INFO L226 Difference]: Without dead ends: 47 [2019-09-10 02:51:33,612 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=171, Unknown=0, NotChecked=0, Total=240 [2019-09-10 02:51:33,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-10 02:51:33,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2019-09-10 02:51:33,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-10 02:51:33,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2019-09-10 02:51:33,622 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 39 [2019-09-10 02:51:33,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:51:33,622 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2019-09-10 02:51:33,622 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-10 02:51:33,623 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2019-09-10 02:51:33,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-09-10 02:51:33,624 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:51:33,625 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:51:33,625 INFO L418 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:51:33,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:51:33,625 INFO L82 PathProgramCache]: Analyzing trace with hash 380905728, now seen corresponding path program 1 times [2019-09-10 02:51:33,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:51:33,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:33,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:51:33,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:51:33,627 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:51:33,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:51:33,747 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-09-10 02:51:33,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:51:33,747 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:51:33,747 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 42 with the following transitions: [2019-09-10 02:51:33,748 INFO L207 CegarAbsIntRunner]: [0], [3], [4], [7], [8], [10], [12], [13], [14], [18], [20], [24], [26], [29], [30], [31], [32], [33], [34], [35], [37], [38] [2019-09-10 02:51:33,750 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:51:33,750 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)