/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.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 05:42:58,497 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 05:42:58,501 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 05:42:58,520 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 05:42:58,547 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 05:42:58,549 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 05:42:58,552 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 05:42:58,553 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 05:42:58,554 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 05:42:58,555 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 05:42:58,557 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 05:42:58,562 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 05:42:58,568 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 05:42:58,572 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 05:42:58,573 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 05:42:58,574 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 05:42:58,577 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 05:42:58,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 05:42:58,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 05:42:58,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 05:42:58,590 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 05:42:58,608 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 05:42:58,609 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 05:42:58,610 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 05:42:58,610 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 05:42:58,611 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 05:42:58,611 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 05:42:58,611 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 05:42:58,611 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 05:42:58,611 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 05:42:58,612 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 05:42:58,612 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 05:42:58,612 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 05:42:58,612 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 05:42:58,612 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 05:42:58,613 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 05:42:58,613 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 05:42:58,613 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 05:42:58,613 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 05:42:58,613 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 05:42:58,614 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 05:42:58,614 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 05:42:58,614 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 05:42:58,614 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 05:42:58,614 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 05:42:58,615 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 05:42:58,953 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 05:42:58,967 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 05:42:58,971 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 05:42:58,972 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 05:42:58,973 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 05:42:58,973 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 05:42:59,054 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f98f2b818/0518aa3e652d469aace80f3087bdc1c5/FLAG8e7500734 [2020-07-20 05:42:59,508 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 05:42:59,509 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 05:42:59,518 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f98f2b818/0518aa3e652d469aace80f3087bdc1c5/FLAG8e7500734 [2020-07-20 05:42:59,838 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f98f2b818/0518aa3e652d469aace80f3087bdc1c5 [2020-07-20 05:42:59,848 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 05:42:59,850 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 05:42:59,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 05:42:59,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 05:42:59,856 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 05:42:59,857 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:42:59" (1/1) ... [2020-07-20 05:42:59,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5276ab18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:42:59, skipping insertion in model container [2020-07-20 05:42:59,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:42:59" (1/1) ... [2020-07-20 05:42:59,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 05:42:59,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 05:43:00,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 05:43:00,080 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 05:43:00,099 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 05:43:00,114 INFO L208 MainTranslator]: Completed translation [2020-07-20 05:43:00,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00 WrapperNode [2020-07-20 05:43:00,115 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 05:43:00,116 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 05:43:00,116 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 05:43:00,116 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 05:43:00,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,133 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,133 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,137 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,139 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,140 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (1/1) ... [2020-07-20 05:43:00,142 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 05:43:00,143 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 05:43:00,143 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 05:43:00,143 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 05:43:00,144 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (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 [2020-07-20 05:43:00,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 05:43:00,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 05:43:00,312 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 05:43:00,312 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 05:43:00,312 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 05:43:00,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 05:43:00,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 05:43:00,313 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 05:43:00,313 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 05:43:00,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 05:43:00,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 05:43:00,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 05:43:00,527 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 05:43:00,527 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 05:43:00,532 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:00 BoogieIcfgContainer [2020-07-20 05:43:00,532 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 05:43:00,534 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 05:43:00,534 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 05:43:00,538 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 05:43:00,538 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:42:59" (1/3) ... [2020-07-20 05:43:00,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@114b5ea6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:00, skipping insertion in model container [2020-07-20 05:43:00,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:00" (2/3) ... [2020-07-20 05:43:00,540 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@114b5ea6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:00, skipping insertion in model container [2020-07-20 05:43:00,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:00" (3/3) ... [2020-07-20 05:43:00,542 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-20 05:43:00,555 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 05:43:00,565 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 05:43:00,601 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 05:43:00,669 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 05:43:00,670 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 05:43:00,670 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 05:43:00,670 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 05:43:00,670 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 05:43:00,670 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 05:43:00,670 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 05:43:00,670 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 05:43:00,693 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 05:43:00,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 05:43:00,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:00,701 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 05:43:00,701 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:00,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:00,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 05:43:00,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:00,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200983792] [2020-07-20 05:43:00,715 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:00,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:00,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:00,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 05:43:00,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200983792] [2020-07-20 05:43:00,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 05:43:00,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 05:43:00,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499918741] [2020-07-20 05:43:00,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 05:43:00,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:00,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 05:43:00,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 05:43:00,990 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 05:43:01,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:01,106 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 05:43:01,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 05:43:01,109 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 05:43:01,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:01,122 INFO L225 Difference]: With dead ends: 44 [2020-07-20 05:43:01,123 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 05:43:01,128 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 [2020-07-20 05:43:01,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 05:43:01,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 05:43:01,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 05:43:01,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 05:43:01,183 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 05:43:01,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:01,183 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 05:43:01,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 05:43:01,184 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 05:43:01,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 05:43:01,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:01,186 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 05:43:01,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 05:43:01,187 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:01,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:01,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 05:43:01,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:01,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799244378] [2020-07-20 05:43:01,189 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:01,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 05:43:01,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799244378] [2020-07-20 05:43:01,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 05:43:01,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 05:43:01,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036316427] [2020-07-20 05:43:01,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 05:43:01,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:01,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 05:43:01,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 05:43:01,269 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 05:43:01,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:01,346 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 05:43:01,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 05:43:01,347 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 05:43:01,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:01,349 INFO L225 Difference]: With dead ends: 36 [2020-07-20 05:43:01,349 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 05:43:01,351 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 [2020-07-20 05:43:01,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 05:43:01,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 05:43:01,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 05:43:01,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 05:43:01,361 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 05:43:01,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:01,361 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 05:43:01,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 05:43:01,362 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 05:43:01,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 05:43:01,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:01,364 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 05:43:01,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-20 05:43:01,364 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:01,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:01,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 05:43:01,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:01,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344418] [2020-07-20 05:43:01,366 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:01,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:01,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 05:43:01,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344418] [2020-07-20 05:43:01,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119224362] [2020-07-20 05:43:01,510 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4b3be0a6 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:01,563 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4b3be0a6 issued 3 check-sat command(s) [2020-07-20 05:43:01,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:01,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 05:43:01,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:01,664 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 05:43:01,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:01,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 05:43:01,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795838854] [2020-07-20 05:43:01,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 05:43:01,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:01,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 05:43:01,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-07-20 05:43:01,667 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 05:43:01,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:01,906 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-07-20 05:43:01,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 05:43:01,907 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 05:43:01,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:01,908 INFO L225 Difference]: With dead ends: 58 [2020-07-20 05:43:01,908 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 05:43:01,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 05:43:01,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 05:43:01,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-20 05:43:01,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 05:43:01,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-07-20 05:43:01,918 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-07-20 05:43:01,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:01,919 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-07-20 05:43:01,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 05:43:01,919 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-07-20 05:43:01,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 05:43:01,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:01,925 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] [2020-07-20 05:43:02,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-20 05:43:02,141 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:02,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:02,142 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 05:43:02,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:02,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463109066] [2020-07-20 05:43:02,142 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:02,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,241 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 05:43:02,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463109066] [2020-07-20 05:43:02,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309663397] [2020-07-20 05:43:02,243 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@58388d14 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:02,278 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@58388d14 issued 3 check-sat command(s) [2020-07-20 05:43:02,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:02,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 05:43:02,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:02,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 05:43:02,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:02,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 05:43:02,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527055233] [2020-07-20 05:43:02,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 05:43:02,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:02,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 05:43:02,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 05:43:02,322 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 9 states. [2020-07-20 05:43:02,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:02,502 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2020-07-20 05:43:02,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 05:43:02,503 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 05:43:02,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:02,507 INFO L225 Difference]: With dead ends: 54 [2020-07-20 05:43:02,507 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 05:43:02,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 05:43:02,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 05:43:02,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2020-07-20 05:43:02,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 05:43:02,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2020-07-20 05:43:02,520 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 27 [2020-07-20 05:43:02,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:02,521 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2020-07-20 05:43:02,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 05:43:02,521 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2020-07-20 05:43:02,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 05:43:02,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:02,523 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1] [2020-07-20 05:43:02,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:02,737 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:02,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:02,738 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 05:43:02,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:02,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531788707] [2020-07-20 05:43:02,740 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:02,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:02,857 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 05:43:02,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531788707] [2020-07-20 05:43:02,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313013248] [2020-07-20 05:43:02,858 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7f393550 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:02,899 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7f393550 issued 3 check-sat command(s) [2020-07-20 05:43:02,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:02,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 05:43:02,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:02,962 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 05:43:02,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:02,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 11 [2020-07-20 05:43:02,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717921897] [2020-07-20 05:43:02,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 05:43:02,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:02,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 05:43:02,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-07-20 05:43:02,965 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand 11 states. [2020-07-20 05:43:03,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:03,279 INFO L93 Difference]: Finished difference Result 108 states and 170 transitions. [2020-07-20 05:43:03,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 05:43:03,280 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 05:43:03,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:03,282 INFO L225 Difference]: With dead ends: 108 [2020-07-20 05:43:03,282 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 05:43:03,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2020-07-20 05:43:03,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 05:43:03,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-07-20 05:43:03,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 05:43:03,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 95 transitions. [2020-07-20 05:43:03,298 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 95 transitions. Word has length 39 [2020-07-20 05:43:03,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:03,298 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 95 transitions. [2020-07-20 05:43:03,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 05:43:03,298 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 95 transitions. [2020-07-20 05:43:03,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 05:43:03,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:03,301 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1] [2020-07-20 05:43:03,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:03,517 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:03,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:03,518 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 05:43:03,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:03,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462843940] [2020-07-20 05:43:03,519 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:03,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:03,681 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 05:43:03,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462843940] [2020-07-20 05:43:03,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163636505] [2020-07-20 05:43:03,682 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@68c2fe0d No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:03,715 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@68c2fe0d issued 3 check-sat command(s) [2020-07-20 05:43:03,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:03,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 05:43:03,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:03,786 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 05:43:03,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:03,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-20 05:43:03,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123107162] [2020-07-20 05:43:03,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 05:43:03,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:03,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 05:43:03,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-07-20 05:43:03,789 INFO L87 Difference]: Start difference. First operand 66 states and 95 transitions. Second operand 13 states. [2020-07-20 05:43:04,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:04,212 INFO L93 Difference]: Finished difference Result 180 states and 324 transitions. [2020-07-20 05:43:04,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 05:43:04,213 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2020-07-20 05:43:04,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:04,219 INFO L225 Difference]: With dead ends: 180 [2020-07-20 05:43:04,219 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 05:43:04,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2020-07-20 05:43:04,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 05:43:04,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 106. [2020-07-20 05:43:04,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 05:43:04,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 169 transitions. [2020-07-20 05:43:04,248 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 169 transitions. Word has length 40 [2020-07-20 05:43:04,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:04,248 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 169 transitions. [2020-07-20 05:43:04,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 05:43:04,249 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 169 transitions. [2020-07-20 05:43:04,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 05:43:04,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:04,253 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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] [2020-07-20 05:43:04,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:04,467 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:04,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:04,468 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 05:43:04,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:04,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661336832] [2020-07-20 05:43:04,469 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:04,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:04,651 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 05:43:04,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661336832] [2020-07-20 05:43:04,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838474779] [2020-07-20 05:43:04,652 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@30e0f437 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:04,691 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@30e0f437 issued 4 check-sat command(s) [2020-07-20 05:43:04,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:04,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 05:43:04,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:04,752 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 05:43:04,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:04,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 05:43:04,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589208853] [2020-07-20 05:43:04,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 05:43:04,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:04,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 05:43:04,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-07-20 05:43:04,755 INFO L87 Difference]: Start difference. First operand 106 states and 169 transitions. Second operand 12 states. [2020-07-20 05:43:05,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:05,119 INFO L93 Difference]: Finished difference Result 265 states and 511 transitions. [2020-07-20 05:43:05,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 05:43:05,121 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2020-07-20 05:43:05,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:05,124 INFO L225 Difference]: With dead ends: 265 [2020-07-20 05:43:05,126 INFO L226 Difference]: Without dead ends: 165 [2020-07-20 05:43:05,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 05:43:05,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-20 05:43:05,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 142. [2020-07-20 05:43:05,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 05:43:05,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 244 transitions. [2020-07-20 05:43:05,189 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 244 transitions. Word has length 54 [2020-07-20 05:43:05,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:05,190 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 244 transitions. [2020-07-20 05:43:05,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 05:43:05,191 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 244 transitions. [2020-07-20 05:43:05,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 05:43:05,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:05,199 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 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] [2020-07-20 05:43:05,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-20 05:43:05,415 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:05,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:05,416 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2020-07-20 05:43:05,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:05,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274967387] [2020-07-20 05:43:05,418 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:05,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:05,655 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 05:43:05,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274967387] [2020-07-20 05:43:05,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208010158] [2020-07-20 05:43:05,657 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@37934d03 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:05,728 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@37934d03 issued 4 check-sat command(s) [2020-07-20 05:43:05,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:05,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 05:43:05,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:05,786 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-20 05:43:05,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:05,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2020-07-20 05:43:05,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027339691] [2020-07-20 05:43:05,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 05:43:05,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:05,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 05:43:05,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-07-20 05:43:05,788 INFO L87 Difference]: Start difference. First operand 142 states and 244 transitions. Second operand 13 states. [2020-07-20 05:43:06,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:06,166 INFO L93 Difference]: Finished difference Result 304 states and 583 transitions. [2020-07-20 05:43:06,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 05:43:06,167 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-07-20 05:43:06,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:06,171 INFO L225 Difference]: With dead ends: 304 [2020-07-20 05:43:06,172 INFO L226 Difference]: Without dead ends: 101 [2020-07-20 05:43:06,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2020-07-20 05:43:06,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-07-20 05:43:06,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 83. [2020-07-20 05:43:06,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-07-20 05:43:06,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 126 transitions. [2020-07-20 05:43:06,212 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 126 transitions. Word has length 55 [2020-07-20 05:43:06,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:06,213 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 126 transitions. [2020-07-20 05:43:06,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 05:43:06,213 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 126 transitions. [2020-07-20 05:43:06,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 05:43:06,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:06,218 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 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] [2020-07-20 05:43:06,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:06,433 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:06,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:06,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1751947273, now seen corresponding path program 2 times [2020-07-20 05:43:06,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:06,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267199372] [2020-07-20 05:43:06,435 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:06,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 05:43:06,663 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 05:43:06,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267199372] [2020-07-20 05:43:06,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434840162] [2020-07-20 05:43:06,665 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@22706618 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:06,715 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@22706618 issued 4 check-sat command(s) [2020-07-20 05:43:06,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 05:43:06,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 05:43:06,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 05:43:06,810 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 7 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 05:43:06,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 05:43:06,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 16 [2020-07-20 05:43:06,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094053508] [2020-07-20 05:43:06,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 05:43:06,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 05:43:06,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 05:43:06,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2020-07-20 05:43:06,813 INFO L87 Difference]: Start difference. First operand 83 states and 126 transitions. Second operand 16 states. [2020-07-20 05:43:07,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 05:43:07,377 INFO L93 Difference]: Finished difference Result 174 states and 293 transitions. [2020-07-20 05:43:07,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 05:43:07,378 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 69 [2020-07-20 05:43:07,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 05:43:07,381 INFO L225 Difference]: With dead ends: 174 [2020-07-20 05:43:07,381 INFO L226 Difference]: Without dead ends: 89 [2020-07-20 05:43:07,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2020-07-20 05:43:07,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-20 05:43:07,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2020-07-20 05:43:07,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 05:43:07,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 107 transitions. [2020-07-20 05:43:07,392 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 107 transitions. Word has length 69 [2020-07-20 05:43:07,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 05:43:07,392 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 107 transitions. [2020-07-20 05:43:07,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 05:43:07,393 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 107 transitions. [2020-07-20 05:43:07,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 05:43:07,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 05:43:07,394 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 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] [2020-07-20 05:43:07,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 05:43:07,608 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 05:43:07,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 05:43:07,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 1 times [2020-07-20 05:43:07,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 05:43:07,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458705441] [2020-07-20 05:43:07,611 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@36b1412a [2020-07-20 05:43:07,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 05:43:07,621 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 05:43:07,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 05:43:07,630 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 05:43:07,655 INFO L174 FreeRefinementEngine]: Strategy CAMEL_SMT_AM found a feasible trace [2020-07-20 05:43:07,655 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 05:43:07,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-07-20 05:43:07,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:43:07 BoogieIcfgContainer [2020-07-20 05:43:07,704 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 05:43:07,706 INFO L168 Benchmark]: Toolchain (without parser) took 7856.33 ms. Allocated memory was 140.5 MB in the beginning and 272.6 MB in the end (delta: 132.1 MB). Free memory was 103.8 MB in the beginning and 160.6 MB in the end (delta: -56.8 MB). Peak memory consumption was 75.3 MB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,712 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 140.5 MB. Free memory was 122.2 MB in the beginning and 122.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,717 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.85 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,718 INFO L168 Benchmark]: Boogie Preprocessor took 26.38 ms. Allocated memory is still 140.5 MB. Free memory was 93.8 MB in the beginning and 92.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,719 INFO L168 Benchmark]: RCFGBuilder took 390.04 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.4 MB in the beginning and 170.3 MB in the end (delta: -77.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,724 INFO L168 Benchmark]: TraceAbstraction took 7169.89 ms. Allocated memory was 203.9 MB in the beginning and 272.6 MB in the end (delta: 68.7 MB). Free memory was 169.6 MB in the beginning and 160.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 77.7 MB. Max. memory is 7.1 GB. [2020-07-20 05:43:07,734 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 140.5 MB. Free memory was 122.2 MB in the beginning and 122.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.85 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.38 ms. Allocated memory is still 140.5 MB. Free memory was 93.8 MB in the beginning and 92.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 390.04 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.4 MB in the beginning and 170.3 MB in the end (delta: -77.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7169.89 ms. Allocated memory was 203.9 MB in the beginning and 272.6 MB in the end (delta: 68.7 MB). Free memory was 169.6 MB in the beginning and 160.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 77.7 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 = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) 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 [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 [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); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.9s, OverallIterations: 10, TraceHistogramMax: 5, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 260 SDtfs, 349 SDslu, 1349 SDs, 0 SdLazy, 1776 SolverSat, 292 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 539 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=142occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 715 NumberOfCodeBlocks, 685 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 631 ConstructedInterpolants, 0 QuantifiedInterpolants, 52071 SizeOfPredicates, 25 NumberOfNonLiveVariables, 656 ConjunctsInSsa, 50 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 331/432 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...