/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/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:29:57,291 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:29:57,294 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:29:57,306 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:29:57,306 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:29:57,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:29:57,308 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:29:57,310 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:29:57,312 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:29:57,313 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:29:57,314 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:29:57,315 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:29:57,315 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:29:57,316 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:29:57,317 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:29:57,318 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:29:57,319 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:29:57,320 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:29:57,322 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:29:57,324 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:29:57,326 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:29:57,327 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:29:57,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:29:57,329 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:29:57,332 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 16:29:57,338 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 16:29:57,339 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 16:29:57,340 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 16:29:57,340 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 16:29:57,341 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 16:29:57,341 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 16:29:57,342 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 16:29:57,343 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 16:29:57,344 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 16:29:57,344 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 16:29:57,345 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 16:29:57,345 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 16:29:57,346 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 16:29:57,346 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:29:57,347 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:29:57,347 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:29:57,348 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 16:29:57,363 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:29:57,363 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:29:57,364 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:29:57,365 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:29:57,365 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:29:57,365 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:29:57,365 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:29:57,365 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:29:57,366 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:29:57,367 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:29:57,367 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:29:57,367 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:29:57,367 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:29:57,368 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:29:57,368 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:29:57,368 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:29:57,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:29:57,368 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:29:57,369 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:29:57,369 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:29:57,369 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:29:57,369 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:29:57,369 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:29:57,370 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:29:57,370 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 16:29:57,649 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:29:57,668 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:29:57,672 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:29:57,675 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:29:57,676 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:29:57,678 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-20 16:29:57,754 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97918bf9a/924960e56dfd42de85bbd9654293ecc0/FLAGf8a8dedd8 [2020-07-20 16:29:58,229 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:29:58,230 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-20 16:29:58,236 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97918bf9a/924960e56dfd42de85bbd9654293ecc0/FLAGf8a8dedd8 [2020-07-20 16:29:58,612 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97918bf9a/924960e56dfd42de85bbd9654293ecc0 [2020-07-20 16:29:58,624 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:29:58,627 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:29:58,630 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:29:58,631 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:29:58,634 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:29:58,636 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,639 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@98ba6eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58, skipping insertion in model container [2020-07-20 16:29:58,639 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:29:58,664 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:29:58,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:29:58,842 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:29:58,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:29:58,872 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:29:58,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58 WrapperNode [2020-07-20 16:29:58,872 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:29:58,873 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:29:58,873 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:29:58,873 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:29:58,888 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,977 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,978 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,981 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,983 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,984 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (1/1) ... [2020-07-20 16:29:58,985 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:29:58,986 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:29:58,986 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:29:58,986 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:29:58,987 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (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 16:29:59,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:29:59,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:29:59,056 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-20 16:29:59,056 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:29:59,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:29:59,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:29:59,057 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-20 16:29:59,057 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:29:59,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:29:59,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:29:59,225 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:29:59,225 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:29:59,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:29:59 BoogieIcfgContainer [2020-07-20 16:29:59,230 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:29:59,231 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:29:59,232 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:29:59,238 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:29:59,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:29:58" (1/3) ... [2020-07-20 16:29:59,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2920055d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:29:59, skipping insertion in model container [2020-07-20 16:29:59,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:29:58" (2/3) ... [2020-07-20 16:29:59,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2920055d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:29:59, skipping insertion in model container [2020-07-20 16:29:59,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:29:59" (3/3) ... [2020-07-20 16:29:59,260 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-20 16:29:59,290 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:29:59,307 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:29:59,338 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:29:59,378 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:29:59,379 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:29:59,380 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:29:59,380 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:29:59,380 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:29:59,380 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:29:59,380 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:29:59,381 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:29:59,401 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 16:29:59,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:29:59,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:29:59,408 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:29:59,408 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:29:59,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:29:59,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-20 16:29:59,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:29:59,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486569585] [2020-07-20 16:29:59,421 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 16:29:59,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:29:59,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:29:59,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:29:59,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:29:59,584 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 16:29:59,585 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:29:59,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486569585] [2020-07-20 16:29:59,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:29:59,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:29:59,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348519667] [2020-07-20 16:29:59,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:29:59,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:29:59,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:29:59,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:29:59,607 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-20 16:29:59,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:29:59,713 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 16:29:59,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:29:59,717 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:29:59,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:29:59,729 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:29:59,729 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:29:59,733 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 16:29:59,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:29:59,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:29:59,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:29:59,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:29:59,779 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 16:29:59,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:29:59,780 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:29:59,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:29:59,780 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:29:59,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:29:59,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:29:59,783 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:29:59,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:29:59,998 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:29:59,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:00,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-20 16:30:00,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:00,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841296889] [2020-07-20 16:30:00,001 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 16:30:00,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:30:00,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:00,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:30:00,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:00,058 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 16:30:00,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:30:00,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841296889] [2020-07-20 16:30:00,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:30:00,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:30:00,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116936118] [2020-07-20 16:30:00,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:30:00,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:00,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:30:00,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:30:00,066 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 16:30:00,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:00,152 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 16:30:00,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:30:00,153 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:30:00,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:00,155 INFO L225 Difference]: With dead ends: 27 [2020-07-20 16:30:00,155 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:30:00,157 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 16:30:00,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:30:00,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 16:30:00,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:30:00,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:30:00,172 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 16:30:00,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:00,172 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:30:00,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:30:00,173 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:30:00,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:30:00,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:00,175 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 16:30:00,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:00,376 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:00,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:00,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-20 16:30:00,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:00,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35785545] [2020-07-20 16:30:00,388 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 16:30:00,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:30:00,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:00,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:30:00,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:00,495 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 16:30:00,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:00,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:00,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:00,748 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 16:30:00,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35785545] [2020-07-20 16:30:00,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:00,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-07-20 16:30:00,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731176927] [2020-07-20 16:30:00,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:30:00,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:00,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:30:00,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:30:00,751 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 10 states. [2020-07-20 16:30:00,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:00,879 INFO L93 Difference]: Finished difference Result 39 states and 57 transitions. [2020-07-20 16:30:00,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:30:00,879 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:30:00,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:00,882 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:30:00,882 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:30:00,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:30:00,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:30:00,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-07-20 16:30:00,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:30:00,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:30:00,894 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 26 [2020-07-20 16:30:00,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:00,895 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:30:00,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:30:00,895 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:30:00,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 16:30:00,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:00,898 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:30:01,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:01,107 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:01,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:01,108 INFO L82 PathProgramCache]: Analyzing trace with hash -801998671, now seen corresponding path program 1 times [2020-07-20 16:30:01,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:01,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807001016] [2020-07-20 16:30:01,110 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 16:30:01,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:30:01,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:01,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:30:01,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:01,257 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-07-20 16:30:01,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:01,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:01,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:01,763 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 36 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:30:01,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807001016] [2020-07-20 16:30:01,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:01,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:30:01,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521180563] [2020-07-20 16:30:01,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:30:01,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:01,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:30:01,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:30:01,767 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 16:30:02,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:02,051 INFO L93 Difference]: Finished difference Result 63 states and 103 transitions. [2020-07-20 16:30:02,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:30:02,052 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-20 16:30:02,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:02,054 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:30:02,054 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:30:02,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 91 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:30:02,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:30:02,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-20 16:30:02,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 16:30:02,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2020-07-20 16:30:02,064 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 54 [2020-07-20 16:30:02,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:02,065 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2020-07-20 16:30:02,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:30:02,065 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2020-07-20 16:30:02,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:30:02,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:02,069 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:30:02,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:02,283 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:02,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:02,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1591893433, now seen corresponding path program 2 times [2020-07-20 16:30:02,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:02,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841458218] [2020-07-20 16:30:02,286 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 16:30:02,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:30:02,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:02,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:30:02,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:02,395 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 169 proven. 12 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:30:02,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:02,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:02,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:02,839 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 53 proven. 93 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 16:30:02,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841458218] [2020-07-20 16:30:02,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:02,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:30:02,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959531792] [2020-07-20 16:30:02,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:30:02,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:02,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:30:02,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:30:02,842 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand 11 states. [2020-07-20 16:30:03,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:03,013 INFO L93 Difference]: Finished difference Result 74 states and 100 transitions. [2020-07-20 16:30:03,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:30:03,015 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-20 16:30:03,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:03,017 INFO L225 Difference]: With dead ends: 74 [2020-07-20 16:30:03,017 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:30:03,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 143 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:30:03,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:30:03,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-07-20 16:30:03,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:30:03,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-07-20 16:30:03,035 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 80 [2020-07-20 16:30:03,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:03,046 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-07-20 16:30:03,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:30:03,047 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-07-20 16:30:03,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:30:03,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:03,051 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:30:03,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:03,267 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:03,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:03,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 3 times [2020-07-20 16:30:03,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:03,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060111750] [2020-07-20 16:30:03,269 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 16:30:03,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:30:03,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:03,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:30:03,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:03,417 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 120 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2020-07-20 16:30:03,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:03,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:03,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:04,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:04,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:04,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:04,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:04,246 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 82 proven. 134 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-07-20 16:30:04,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060111750] [2020-07-20 16:30:04,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:04,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:30:04,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240282657] [2020-07-20 16:30:04,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:30:04,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:04,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:30:04,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:30:04,249 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-07-20 16:30:04,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:04,644 INFO L93 Difference]: Finished difference Result 84 states and 115 transitions. [2020-07-20 16:30:04,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:30:04,647 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 82 [2020-07-20 16:30:04,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:04,649 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:30:04,649 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 16:30:04,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:30:04,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 16:30:04,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-07-20 16:30:04,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 16:30:04,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-07-20 16:30:04,661 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 82 [2020-07-20 16:30:04,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:04,662 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-07-20 16:30:04,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:30:04,662 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-07-20 16:30:04,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:30:04,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:04,663 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 16:30:04,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:04,878 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:04,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:04,879 INFO L82 PathProgramCache]: Analyzing trace with hash -383842586, now seen corresponding path program 4 times [2020-07-20 16:30:04,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:04,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647345304] [2020-07-20 16:30:04,880 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 16:30:04,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:30:04,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:04,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:30:04,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:04,999 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 16:30:04,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:05,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:05,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:05,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:05,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:05,530 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 16:30:05,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647345304] [2020-07-20 16:30:05,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:05,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-20 16:30:05,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983831419] [2020-07-20 16:30:05,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:30:05,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:05,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:30:05,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:30:05,533 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 12 states. [2020-07-20 16:30:05,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:05,674 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2020-07-20 16:30:05,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:30:05,675 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 68 [2020-07-20 16:30:05,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:05,677 INFO L225 Difference]: With dead ends: 53 [2020-07-20 16:30:05,678 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 16:30:05,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:30:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 16:30:05,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-20 16:30:05,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 16:30:05,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-07-20 16:30:05,692 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 68 [2020-07-20 16:30:05,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:05,692 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-07-20 16:30:05,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:30:05,692 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-07-20 16:30:05,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-20 16:30:05,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:05,695 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:30:05,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:05,900 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:05,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:05,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-07-20 16:30:05,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:05,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926876984] [2020-07-20 16:30:05,903 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 16:30:05,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:30:05,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:30:05,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:30:06,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:30:06,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 269 proven. 426 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2020-07-20 16:30:06,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:30:07,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:07,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:30:08,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 269 proven. 467 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 16:30:08,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926876984] [2020-07-20 16:30:08,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:30:08,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 25 [2020-07-20 16:30:08,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107400577] [2020-07-20 16:30:08,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:30:08,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:30:08,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:30:08,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:30:08,042 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 25 states. [2020-07-20 16:30:08,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:30:08,915 INFO L93 Difference]: Finished difference Result 129 states and 216 transitions. [2020-07-20 16:30:08,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:30:08,916 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 150 [2020-07-20 16:30:08,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:30:08,921 INFO L225 Difference]: With dead ends: 129 [2020-07-20 16:30:08,921 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 16:30:08,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 259 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=523, Invalid=1547, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:30:08,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 16:30:08,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-20 16:30:08,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 16:30:08,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 103 transitions. [2020-07-20 16:30:08,952 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 103 transitions. Word has length 150 [2020-07-20 16:30:08,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:30:08,954 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 103 transitions. [2020-07-20 16:30:08,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:30:08,954 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 103 transitions. [2020-07-20 16:30:08,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:30:08,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:30:08,959 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 16:30:09,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:09,160 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:30:09,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:30:09,160 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-07-20 16:30:09,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:30:09,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196178536] [2020-07-20 16:30:09,161 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 16:30:09,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:30:09,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:30:09,238 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:30:09,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:30:09,262 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:30:09,286 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:30:09,286 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:30:09,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:30:09,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:30:09 BoogieIcfgContainer [2020-07-20 16:30:09,534 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:30:09,537 INFO L168 Benchmark]: Toolchain (without parser) took 10910.66 ms. Allocated memory was 137.9 MB in the beginning and 327.7 MB in the end (delta: 189.8 MB). Free memory was 101.2 MB in the beginning and 205.3 MB in the end (delta: -104.1 MB). Peak memory consumption was 85.7 MB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,537 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,538 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.85 ms. Allocated memory is still 137.9 MB. Free memory was 100.8 MB in the beginning and 91.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,539 INFO L168 Benchmark]: Boogie Preprocessor took 112.45 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 91.3 MB in the beginning and 181.1 MB in the end (delta: -89.8 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,540 INFO L168 Benchmark]: RCFGBuilder took 243.95 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 168.4 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,541 INFO L168 Benchmark]: TraceAbstraction took 10302.77 ms. Allocated memory was 201.9 MB in the beginning and 327.7 MB in the end (delta: 125.8 MB). Free memory was 168.4 MB in the beginning and 205.3 MB in the end (delta: -36.9 MB). Peak memory consumption was 88.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:30:09,545 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.85 ms. Allocated memory is still 137.9 MB. Free memory was 100.8 MB in the beginning and 91.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.45 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 91.3 MB in the beginning and 181.1 MB in the end (delta: -89.8 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 243.95 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 168.4 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10302.77 ms. Allocated memory was 201.9 MB in the beginning and 327.7 MB in the end (delta: 125.8 MB). Free memory was 168.4 MB in the beginning and 205.3 MB in the end (delta: -36.9 MB). Peak memory consumption was 88.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 10.1s, OverallIterations: 9, TraceHistogramMax: 21, AutomataDifference: 2.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 547 SDslu, 586 SDs, 0 SdLazy, 780 SolverSat, 608 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1003 GetRequests, 809 SyntacticMatches, 58 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred 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, 8 MinimizatonAttempts, 22 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 5.1s InterpolantComputationTime, 596 NumberOfCodeBlocks, 383 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 933 ConstructedInterpolants, 0 QuantifiedInterpolants, 187057 SizeOfPredicates, 44 NumberOfNonLiveVariables, 818 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 2540/4080 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...