/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:56:15,366 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:56:15,371 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:56:15,407 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:56:15,408 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:56:15,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:56:15,419 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:56:15,434 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:56:15,437 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:56:15,442 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:56:15,445 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:56:15,448 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:56:15,449 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:56:15,453 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:56:15,458 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:56:15,461 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:56:15,466 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:56:15,468 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:56:15,470 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:56:15,480 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:56:15,489 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:56:15,495 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:56:15,498 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:56:15,500 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:56:15,504 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:56:15,526 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:56:15,527 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:56:15,530 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:56:15,532 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 16:56:15,579 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:56:15,579 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:56:15,583 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:56:15,585 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:56:15,585 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:56:15,586 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:56:15,586 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:56:15,586 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:56:15,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:56:15,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:56:15,588 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:56:15,589 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:56:15,589 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:56:15,590 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:56:15,590 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:56:15,590 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:56:15,590 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:56:15,591 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:56:15,591 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:56:15,591 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:56:15,591 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:56:15,592 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:15,592 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:56:15,592 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:56:15,592 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:56:15,593 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:56:15,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:15,593 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:56:15,593 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:56:15,593 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES 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 [2020-07-20 16:56:16,003 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:56:16,044 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:56:16,051 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:56:16,055 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:56:16,056 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:56:16,057 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-20 16:56:16,198 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77b1c8356/cb17d1dee8444e50bd7adc3ac60cd5e7/FLAG3d7827f0a [2020-07-20 16:56:17,001 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:56:17,002 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-20 16:56:17,014 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77b1c8356/cb17d1dee8444e50bd7adc3ac60cd5e7/FLAG3d7827f0a [2020-07-20 16:56:17,040 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77b1c8356/cb17d1dee8444e50bd7adc3ac60cd5e7 [2020-07-20 16:56:17,062 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:56:17,068 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:56:17,070 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:17,070 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:56:17,076 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:56:17,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,084 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9188d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17, skipping insertion in model container [2020-07-20 16:56:17,085 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,099 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:56:17,126 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:56:17,432 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:17,440 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:56:17,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:17,476 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:56:17,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17 WrapperNode [2020-07-20 16:56:17,478 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:17,480 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:56:17,480 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:56:17,480 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:56:17,496 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,511 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,514 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,515 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (1/1) ... [2020-07-20 16:56:17,517 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:56:17,518 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:56:17,519 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:56:17,519 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:56:17,521 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (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 16:56:17,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:56:17,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:56:17,730 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 16:56:17,731 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:56:17,731 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:56:17,732 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:56:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 16:56:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:56:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:56:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:56:17,989 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:56:17,989 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:56:17,997 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:17 BoogieIcfgContainer [2020-07-20 16:56:17,997 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:56:17,999 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:56:18,000 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:56:18,005 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:56:18,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:56:17" (1/3) ... [2020-07-20 16:56:18,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@752899bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:18, skipping insertion in model container [2020-07-20 16:56:18,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:17" (2/3) ... [2020-07-20 16:56:18,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@752899bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:18, skipping insertion in model container [2020-07-20 16:56:18,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:17" (3/3) ... [2020-07-20 16:56:18,011 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-07-20 16:56:18,029 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:56:18,042 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:56:18,069 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:56:18,143 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:56:18,143 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:56:18,143 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:56:18,143 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:56:18,143 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:56:18,144 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:56:18,144 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:56:18,144 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:56:18,194 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 16:56:18,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:56:18,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:18,212 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:18,214 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:18,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:18,227 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 16:56:18,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:18,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046256029] [2020-07-20 16:56:18,244 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:18,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:18,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:18,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:18,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:18,486 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 16:56:18,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:18,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046256029] [2020-07-20 16:56:18,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:18,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:18,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781524699] [2020-07-20 16:56:18,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:18,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:18,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:18,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:18,520 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 16:56:18,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:18,675 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 16:56:18,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:18,678 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:56:18,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:18,694 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:56:18,694 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:56:18,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 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 16:56:18,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:56:18,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:56:18,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:56:18,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:56:18,761 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 16:56:18,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:18,762 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:56:18,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:18,763 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:56:18,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:56:18,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:18,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:18,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:18,973 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:18,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:18,974 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 16:56:18,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:18,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792495247] [2020-07-20 16:56:18,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:19,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:19,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:19,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:19,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:19,066 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 16:56:19,066 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:19,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792495247] [2020-07-20 16:56:19,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:19,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:19,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739747439] [2020-07-20 16:56:19,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:19,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:19,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:19,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:19,073 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 16:56:19,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:19,166 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 16:56:19,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:19,168 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:56:19,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:19,169 INFO L225 Difference]: With dead ends: 27 [2020-07-20 16:56:19,170 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:56:19,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 16:56:19,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:56:19,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 16:56:19,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:56:19,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:56:19,182 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 16:56:19,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:19,183 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:56:19,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:19,183 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:56:19,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:56:19,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:19,185 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:19,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:19,393 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:19,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:19,395 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 16:56:19,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:19,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71465199] [2020-07-20 16:56:19,396 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:19,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:19,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:19,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:19,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:19,520 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:56:19,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:19,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,872 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:56:19,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71465199] [2020-07-20 16:56:19,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:19,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:56:19,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238702951] [2020-07-20 16:56:19,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:56:19,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:19,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:56:19,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:56:19,877 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 16:56:20,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:20,045 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 16:56:20,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:56:20,046 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 16:56:20,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:20,049 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:56:20,049 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:56:20,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:20,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:56:20,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 16:56:20,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:56:20,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:56:20,062 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 16:56:20,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:20,063 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:56:20,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:56:20,064 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:56:20,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:56:20,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:20,066 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:20,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,281 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:20,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:20,282 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 16:56:20,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:20,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681783424] [2020-07-20 16:56:20,284 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:20,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:20,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:20,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:20,403 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:56:20,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:20,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,626 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:56:20,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681783424] [2020-07-20 16:56:20,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:20,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:56:20,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147067040] [2020-07-20 16:56:20,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:56:20,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:20,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:56:20,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:56:20,630 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 16:56:20,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:20,746 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 16:56:20,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:56:20,747 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 16:56:20,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:20,749 INFO L225 Difference]: With dead ends: 37 [2020-07-20 16:56:20,750 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:56:20,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:20,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:56:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 16:56:20,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:56:20,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:56:20,762 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 16:56:20,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:20,763 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:56:20,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:56:20,763 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:56:20,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:56:20,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:20,765 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:20,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,981 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:20,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:20,982 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 16:56:20,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:20,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265041696] [2020-07-20 16:56:20,984 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:21,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:21,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:21,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:21,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:21,099 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:56:21,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:21,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:21,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:21,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:21,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:21,550 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:56:21,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265041696] [2020-07-20 16:56:21,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:21,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:56:21,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909214530] [2020-07-20 16:56:21,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:56:21,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:21,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:56:21,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:21,554 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 16:56:21,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:21,816 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 16:56:21,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:21,817 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 16:56:21,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:21,826 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:56:21,826 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:56:21,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:21,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:56:21,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 16:56:21,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:56:21,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:56:21,863 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 16:56:21,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:21,864 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:56:21,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:56:21,864 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:56:21,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:56:21,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:21,867 INFO L422 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] [2020-07-20 16:56:22,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:22,083 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:22,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:22,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 16:56:22,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:22,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175300530] [2020-07-20 16:56:22,086 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:22,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:22,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:22,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:22,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:22,197 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 16:56:22,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:22,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,573 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:56:22,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175300530] [2020-07-20 16:56:22,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:22,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:56:22,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005603138] [2020-07-20 16:56:22,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:56:22,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:22,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:56:22,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:22,577 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 16:56:22,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:22,767 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 16:56:22,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:22,768 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:56:22,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:22,770 INFO L225 Difference]: With dead ends: 47 [2020-07-20 16:56:22,770 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 16:56:22,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:22,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 16:56:22,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 16:56:22,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:56:22,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:56:22,785 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 16:56:22,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:22,786 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:56:22,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:56:22,786 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:56:22,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 16:56:22,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:22,790 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:23,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:23,004 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:23,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:23,005 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 16:56:23,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:23,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784595148] [2020-07-20 16:56:23,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:23,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:23,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:23,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:23,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:23,165 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 16:56:23,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:23,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,918 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 16:56:23,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784595148] [2020-07-20 16:56:23,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:23,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:56:23,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487136966] [2020-07-20 16:56:23,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:56:23,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:23,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:56:23,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:56:23,924 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 16:56:24,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:24,199 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 16:56:24,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:24,200 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 16:56:24,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:24,206 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:56:24,207 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:56:24,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:24,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:56:24,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 16:56:24,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:56:24,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 16:56:24,247 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 16:56:24,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:24,248 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 16:56:24,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:56:24,249 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 16:56:24,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 16:56:24,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:24,255 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:24,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:24,472 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:24,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:24,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 16:56:24,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:24,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844066759] [2020-07-20 16:56:24,473 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:24,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:24,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:24,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:24,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:24,686 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 16:56:24,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:25,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,261 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-20 16:56:26,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844066759] [2020-07-20 16:56:26,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:26,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-20 16:56:26,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541013926] [2020-07-20 16:56:26,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:26,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:26,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:26,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:26,265 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-20 16:56:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:26,966 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-20 16:56:26,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:56:26,967 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-20 16:56:26,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:26,969 INFO L225 Difference]: With dead ends: 94 [2020-07-20 16:56:26,969 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:56:26,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:56:26,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:56:26,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:56:26,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:56:26,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-20 16:56:26,987 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-20 16:56:26,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:26,988 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-20 16:56:26,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:26,991 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-20 16:56:26,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:56:26,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:26,996 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:27,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:27,212 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:27,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:27,213 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-20 16:56:27,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:27,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354446504] [2020-07-20 16:56:27,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:27,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:27,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:27,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:27,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:27,345 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 16:56:27,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:27,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,957 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-20 16:56:27,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354446504] [2020-07-20 16:56:27,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:27,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-20 16:56:27,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254177185] [2020-07-20 16:56:27,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:27,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:27,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:27,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:27,962 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 12 states. [2020-07-20 16:56:28,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:28,127 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-20 16:56:28,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:28,128 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 68 [2020-07-20 16:56:28,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:28,131 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:56:28,131 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:56:28,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:28,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:56:28,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 16:56:28,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:56:28,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-20 16:56:28,144 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-20 16:56:28,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:28,145 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-20 16:56:28,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:28,145 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-20 16:56:28,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:56:28,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:28,152 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:28,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:28,354 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:28,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:28,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-20 16:56:28,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:28,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16729255] [2020-07-20 16:56:28,355 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:28,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:56:28,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:56:28,438 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:56:28,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:56:28,466 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:56:28,505 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:56:28,506 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:56:28,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:28,775 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:56:28 BoogieIcfgContainer [2020-07-20 16:56:28,775 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:56:28,779 INFO L168 Benchmark]: Toolchain (without parser) took 11713.46 ms. Allocated memory was 136.3 MB in the beginning and 312.0 MB in the end (delta: 175.6 MB). Free memory was 101.3 MB in the beginning and 196.0 MB in the end (delta: -94.7 MB). Peak memory consumption was 80.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,780 INFO L168 Benchmark]: CDTParser took 1.07 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,781 INFO L168 Benchmark]: CACSL2BoogieTranslator took 409.29 ms. Allocated memory is still 136.3 MB. Free memory was 100.9 MB in the beginning and 90.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,782 INFO L168 Benchmark]: Boogie Preprocessor took 38.19 ms. Allocated memory is still 136.3 MB. Free memory was 90.8 MB in the beginning and 89.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,783 INFO L168 Benchmark]: RCFGBuilder took 479.14 ms. Allocated memory was 136.3 MB in the beginning and 202.9 MB in the end (delta: 66.6 MB). Free memory was 89.5 MB in the beginning and 170.7 MB in the end (delta: -81.3 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,784 INFO L168 Benchmark]: TraceAbstraction took 10776.24 ms. Allocated memory was 202.9 MB in the beginning and 312.0 MB in the end (delta: 109.1 MB). Free memory was 170.1 MB in the beginning and 196.0 MB in the end (delta: -26.0 MB). Peak memory consumption was 83.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:28,788 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.07 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 409.29 ms. Allocated memory is still 136.3 MB. Free memory was 100.9 MB in the beginning and 90.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 38.19 ms. Allocated memory is still 136.3 MB. Free memory was 90.8 MB in the beginning and 89.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 479.14 ms. Allocated memory was 136.3 MB in the beginning and 202.9 MB in the end (delta: 66.6 MB). Free memory was 89.5 MB in the beginning and 170.7 MB in the end (delta: -81.3 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10776.24 ms. Allocated memory was 202.9 MB in the beginning and 312.0 MB in the end (delta: 109.1 MB). Free memory was 170.1 MB in the beginning and 196.0 MB in the end (delta: -26.0 MB). Peak memory consumption was 83.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; VAL [x=5] [L25] CALL, EXPR fibo(x) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=5, x=5] [L25] int result = fibo(x); [L26] COND TRUE result == 5 VAL [result=5, x=5] [L27] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 10.5s, OverallIterations: 10, TraceHistogramMax: 15, AutomataDifference: 2.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 151 SDtfs, 404 SDslu, 502 SDs, 0 SdLazy, 570 SolverSat, 390 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 791 GetRequests, 627 SyntacticMatches, 50 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 45 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 5.1s InterpolantComputationTime, 498 NumberOfCodeBlocks, 388 NumberOfCodeBlocksAsserted, 30 NumberOfCheckSat, 735 ConstructedInterpolants, 0 QuantifiedInterpolants, 103333 SizeOfPredicates, 37 NumberOfNonLiveVariables, 734 ConjunctsInSsa, 72 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 966/1820 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...