/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_FUNCTIONS --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/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:08:26,515 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:08:26,517 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:08:26,529 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:08:26,530 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:08:26,531 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:08:26,532 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:08:26,534 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:08:26,536 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:08:26,537 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:08:26,538 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:08:26,539 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:08:26,539 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:08:26,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:08:26,541 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:08:26,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:08:26,543 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:08:26,544 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:08:26,545 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:08:26,548 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:08:26,549 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:08:26,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:08:26,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:08:26,552 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:08:26,556 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:08:26,569 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:08:26,571 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:08:26,571 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:08:26,572 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 13:08:26,597 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:08:26,598 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:08:26,600 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:08:26,600 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:08:26,600 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:08:26,600 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:08:26,601 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:08:26,601 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:08:26,601 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:08:26,601 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:08:26,602 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:08:26,603 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:08:26,603 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:08:26,603 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:08:26,603 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:08:26,604 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:08:26,604 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:08:26,604 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:08:26,604 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:08:26,604 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:08:26,605 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:08:26,605 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:08:26,605 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:08:26,605 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:08:26,606 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:08:26,606 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:08:26,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:26,606 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:08:26,606 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:08:26,606 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_FUNCTIONS 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 13:08:26,896 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:08:26,910 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:08:26,914 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:08:26,915 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:08:26,915 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:08:26,916 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-20 13:08:26,985 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62dfa2841/f8f53139166e4808a742f0f4e904c70b/FLAGd7b73ae55 [2020-07-20 13:08:27,426 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:08:27,427 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-20 13:08:27,433 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62dfa2841/f8f53139166e4808a742f0f4e904c70b/FLAGd7b73ae55 [2020-07-20 13:08:27,848 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62dfa2841/f8f53139166e4808a742f0f4e904c70b [2020-07-20 13:08:27,859 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:08:27,862 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:08:27,863 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:08:27,863 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:08:27,867 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:08:27,868 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:08:27" (1/1) ... [2020-07-20 13:08:27,871 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@204f065a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:27, skipping insertion in model container [2020-07-20 13:08:27,872 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:08:27" (1/1) ... [2020-07-20 13:08:27,880 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:08:27,902 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:08:28,142 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:08:28,148 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:08:28,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:08:28,181 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:08:28,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28 WrapperNode [2020-07-20 13:08:28,182 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:08:28,183 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:08:28,183 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:08:28,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:08:28,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,198 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,198 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,202 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,204 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,205 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (1/1) ... [2020-07-20 13:08:28,206 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:08:28,207 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:08:28,207 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:08:28,207 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:08:28,208 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (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 13:08:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:08:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:08:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-20 13:08:28,355 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:08:28,355 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:08:28,356 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:08:28,356 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-20 13:08:28,356 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:08:28,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:08:28,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:08:28,556 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:08:28,556 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:08:28,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:08:28 BoogieIcfgContainer [2020-07-20 13:08:28,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:08:28,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:08:28,562 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:08:28,566 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:08:28,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:08:27" (1/3) ... [2020-07-20 13:08:28,567 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f8c0392 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:08:28, skipping insertion in model container [2020-07-20 13:08:28,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:08:28" (2/3) ... [2020-07-20 13:08:28,567 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f8c0392 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:08:28, skipping insertion in model container [2020-07-20 13:08:28,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:08:28" (3/3) ... [2020-07-20 13:08:28,569 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-07-20 13:08:28,580 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:08:28,588 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:08:28,604 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:08:28,637 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:08:28,637 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:08:28,638 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:08:28,638 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:08:28,638 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:08:28,638 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:08:28,639 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:08:28,639 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:08:28,664 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:08:28,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:08:28,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:28,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:08:28,675 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:28,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:28,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-07-20 13:08:28,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:28,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671504225] [2020-07-20 13:08:28,694 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 13:08:28,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:28,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:28,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:08:28,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:28,897 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 13:08:28,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:08:28,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671504225] [2020-07-20 13:08:28,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:08:28,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 13:08:28,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606977830] [2020-07-20 13:08:28,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 13:08:28,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:28,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 13:08:28,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:08:28,918 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-07-20 13:08:29,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:29,089 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-07-20 13:08:29,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:08:29,091 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-20 13:08:29,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:29,102 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:08:29,103 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 13:08:29,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 13:08:29,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 13:08:29,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 13:08:29,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 13:08:29,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-20 13:08:29,157 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-07-20 13:08:29,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:29,157 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-20 13:08:29,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 13:08:29,158 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-20 13:08:29,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 13:08:29,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:29,160 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:08:29,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:29,374 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:29,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:29,375 INFO L82 PathProgramCache]: Analyzing trace with hash -509871596, now seen corresponding path program 1 times [2020-07-20 13:08:29,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:29,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329796428] [2020-07-20 13:08:29,377 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 13:08:29,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:29,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:29,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:08:29,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:29,472 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 13:08:29,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:08:29,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329796428] [2020-07-20 13:08:29,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:08:29,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 13:08:29,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956666347] [2020-07-20 13:08:29,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 13:08:29,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:29,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 13:08:29,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:08:29,476 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-20 13:08:29,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:29,574 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-07-20 13:08:29,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:08:29,575 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-20 13:08:29,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:29,576 INFO L225 Difference]: With dead ends: 28 [2020-07-20 13:08:29,576 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:08:29,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 13:08:29,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:08:29,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-20 13:08:29,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 13:08:29,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-20 13:08:29,586 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2020-07-20 13:08:29,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:29,586 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-20 13:08:29,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 13:08:29,586 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-20 13:08:29,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:08:29,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:29,588 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 13:08:29,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:29,804 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:29,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:29,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-07-20 13:08:29,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:29,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061045249] [2020-07-20 13:08:29,807 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 13:08:29,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:08:29,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:29,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 13:08:29,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:29,897 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:08:29,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:08:29,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061045249] [2020-07-20 13:08:29,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:08:29,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 13:08:29,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750339280] [2020-07-20 13:08:29,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 13:08:29,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:29,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 13:08:29,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:08:29,901 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-20 13:08:29,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:29,993 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-07-20 13:08:29,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:08:29,994 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-07-20 13:08:29,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:29,995 INFO L225 Difference]: With dead ends: 39 [2020-07-20 13:08:29,995 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:08:29,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:08:29,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:08:30,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:08:30,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:08:30,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-07-20 13:08:30,005 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2020-07-20 13:08:30,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:30,005 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-07-20 13:08:30,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 13:08:30,006 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-07-20 13:08:30,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 13:08:30,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:30,008 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, 1] [2020-07-20 13:08:30,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:30,222 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:30,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:30,232 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-07-20 13:08:30,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:30,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024922712] [2020-07-20 13:08:30,232 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 13:08:30,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:30,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:30,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:08:30,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:30,384 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 13:08:30,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:30,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:30,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:30,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:08:30,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024922712] [2020-07-20 13:08:30,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:30,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-20 13:08:30,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289744088] [2020-07-20 13:08:30,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:08:30,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:30,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:08:30,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:08:30,749 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 17 states. [2020-07-20 13:08:31,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:31,026 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-07-20 13:08:31,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:08:31,026 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2020-07-20 13:08:31,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:31,029 INFO L225 Difference]: With dead ends: 34 [2020-07-20 13:08:31,029 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:08:31,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:08:31,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:08:31,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-20 13:08:31,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 13:08:31,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2020-07-20 13:08:31,039 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2020-07-20 13:08:31,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:31,040 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2020-07-20 13:08:31,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:08:31,040 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2020-07-20 13:08:31,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:08:31,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:31,042 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, 1, 1] [2020-07-20 13:08:31,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:31,257 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:31,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:31,258 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 2 times [2020-07-20 13:08:31,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:31,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736627546] [2020-07-20 13:08:31,260 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 13:08:31,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:31,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:31,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:08:31,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 12 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:08:31,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:31,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:31,743 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 13:08:31,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736627546] [2020-07-20 13:08:31,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:31,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 13:08:31,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270599229] [2020-07-20 13:08:31,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:08:31,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:31,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:08:31,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:08:31,746 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 11 states. [2020-07-20 13:08:31,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:31,904 INFO L93 Difference]: Finished difference Result 56 states and 80 transitions. [2020-07-20 13:08:31,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:08:31,905 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:08:31,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:31,910 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:08:31,910 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 13:08:31,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 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 13:08:31,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 13:08:31,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2020-07-20 13:08:31,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:08:31,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2020-07-20 13:08:31,926 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 41 [2020-07-20 13:08:31,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:31,929 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2020-07-20 13:08:31,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:08:31,934 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2020-07-20 13:08:31,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 13:08:31,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:31,938 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, 1] [2020-07-20 13:08:32,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:32,139 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:32,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:32,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 3 times [2020-07-20 13:08:32,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:32,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094033180] [2020-07-20 13:08:32,140 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 13:08:32,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:32,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:32,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:08:32,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:32,322 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:08:32,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:32,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:32,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:32,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:32,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:32,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:32,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:33,045 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 13:08:33,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094033180] [2020-07-20 13:08:33,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:33,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 23 [2020-07-20 13:08:33,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859907739] [2020-07-20 13:08:33,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:08:33,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:33,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:08:33,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:08:33,049 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand 23 states. [2020-07-20 13:08:33,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:33,585 INFO L93 Difference]: Finished difference Result 56 states and 88 transitions. [2020-07-20 13:08:33,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 13:08:33,585 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 42 [2020-07-20 13:08:33,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:33,588 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:08:33,588 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 13:08:33,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=238, Invalid=1022, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 13:08:33,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 13:08:33,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2020-07-20 13:08:33,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:08:33,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 63 transitions. [2020-07-20 13:08:33,603 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 63 transitions. Word has length 42 [2020-07-20 13:08:33,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:33,604 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 63 transitions. [2020-07-20 13:08:33,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:08:33,604 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 63 transitions. [2020-07-20 13:08:33,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-07-20 13:08:33,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:33,607 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, 1] [2020-07-20 13:08:33,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:33,820 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:33,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:33,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1434057987, now seen corresponding path program 4 times [2020-07-20 13:08:33,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:33,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753002757] [2020-07-20 13:08:33,823 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 13:08:33,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:08:33,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:33,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:08:33,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:33,951 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-07-20 13:08:33,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:34,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:34,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:34,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:34,428 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-20 13:08:34,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753002757] [2020-07-20 13:08:34,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:34,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:08:34,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213697808] [2020-07-20 13:08:34,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:08:34,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:34,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:08:34,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:08:34,431 INFO L87 Difference]: Start difference. First operand 41 states and 63 transitions. Second operand 13 states. [2020-07-20 13:08:34,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:34,678 INFO L93 Difference]: Finished difference Result 88 states and 151 transitions. [2020-07-20 13:08:34,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:08:34,679 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 83 [2020-07-20 13:08:34,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:34,681 INFO L225 Difference]: With dead ends: 88 [2020-07-20 13:08:34,681 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 13:08:34,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 145 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 13:08:34,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 13:08:34,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2020-07-20 13:08:34,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:08:34,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2020-07-20 13:08:34,693 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 83 [2020-07-20 13:08:34,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:34,694 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2020-07-20 13:08:34,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:08:34,694 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2020-07-20 13:08:34,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-20 13:08:34,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:34,696 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, 1] [2020-07-20 13:08:34,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:34,911 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:34,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:34,912 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 5 times [2020-07-20 13:08:34,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:34,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50931086] [2020-07-20 13:08:34,913 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 13:08:34,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:08:34,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:34,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:08:34,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:35,075 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 93 proven. 162 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 13:08:35,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:35,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:35,821 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 92 proven. 171 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 13:08:35,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50931086] [2020-07-20 13:08:35,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:35,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 13:08:35,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899814076] [2020-07-20 13:08:35,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:08:35,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:35,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:08:35,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:08:35,824 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand 17 states. [2020-07-20 13:08:36,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:36,242 INFO L93 Difference]: Finished difference Result 106 states and 166 transitions. [2020-07-20 13:08:36,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:08:36,244 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 97 [2020-07-20 13:08:36,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:36,246 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:08:36,246 INFO L226 Difference]: Without dead ends: 69 [2020-07-20 13:08:36,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 167 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=230, Invalid=526, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:08:36,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-20 13:08:36,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2020-07-20 13:08:36,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:08:36,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 85 transitions. [2020-07-20 13:08:36,261 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 85 transitions. Word has length 97 [2020-07-20 13:08:36,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:36,262 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 85 transitions. [2020-07-20 13:08:36,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:08:36,262 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 85 transitions. [2020-07-20 13:08:36,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-20 13:08:36,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:36,264 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:08:36,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:36,469 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:36,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:36,470 INFO L82 PathProgramCache]: Analyzing trace with hash -680629368, now seen corresponding path program 6 times [2020-07-20 13:08:36,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:36,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811702411] [2020-07-20 13:08:36,471 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 13:08:36,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:36,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:36,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:08:36,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 276 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2020-07-20 13:08:36,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:37,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:37,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:37,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:37,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:37,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:37,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:38,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:38,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:38,149 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 306 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 13:08:38,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811702411] [2020-07-20 13:08:38,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:38,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:08:38,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128061578] [2020-07-20 13:08:38,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:08:38,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:38,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:08:38,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:08:38,152 INFO L87 Difference]: Start difference. First operand 60 states and 85 transitions. Second operand 21 states. [2020-07-20 13:08:38,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:38,730 INFO L93 Difference]: Finished difference Result 130 states and 224 transitions. [2020-07-20 13:08:38,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 13:08:38,731 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 124 [2020-07-20 13:08:38,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:38,736 INFO L225 Difference]: With dead ends: 130 [2020-07-20 13:08:38,736 INFO L226 Difference]: Without dead ends: 79 [2020-07-20 13:08:38,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 211 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 13:08:38,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-20 13:08:38,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-20 13:08:38,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 13:08:38,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 98 transitions. [2020-07-20 13:08:38,762 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 98 transitions. Word has length 124 [2020-07-20 13:08:38,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:38,763 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 98 transitions. [2020-07-20 13:08:38,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:08:38,763 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 98 transitions. [2020-07-20 13:08:38,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-20 13:08:38,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:08:38,773 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:08:38,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:38,974 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:08:38,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:08:38,975 INFO L82 PathProgramCache]: Analyzing trace with hash 375112636, now seen corresponding path program 7 times [2020-07-20 13:08:38,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:08:38,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808459481] [2020-07-20 13:08:38,976 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 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 13:08:39,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:08:39,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:08:39,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 13:08:39,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:08:39,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 258 proven. 604 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-07-20 13:08:39,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:08:40,518 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:08:40,670 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:08:40,807 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 13:08:40,948 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 13:08:41,602 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 13:08:41,876 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 13:08:42,145 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-20 13:08:42,416 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-20 13:08:44,756 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:08:44,888 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:08:45,029 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 13:08:45,172 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 13:08:46,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:46,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:46,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:46,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:46,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:46,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:47,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:47,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:47,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:47,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:47,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:08:48,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 207 proven. 695 refuted. 0 times theorem prover too weak. 752 trivial. 0 not checked. [2020-07-20 13:08:48,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808459481] [2020-07-20 13:08:48,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:08:48,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 35] total 48 [2020-07-20 13:08:48,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549941306] [2020-07-20 13:08:48,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 13:08:48,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:08:48,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 13:08:48,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1962, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 13:08:48,962 INFO L87 Difference]: Start difference. First operand 72 states and 98 transitions. Second operand 48 states. [2020-07-20 13:08:50,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:08:50,487 INFO L93 Difference]: Finished difference Result 96 states and 147 transitions. [2020-07-20 13:08:50,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 13:08:50,488 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 178 [2020-07-20 13:08:50,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:08:50,490 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:08:50,491 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:08:50,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 268 SyntacticMatches, 41 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=757, Invalid=4499, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 13:08:50,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:08:50,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:08:50,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:08:50,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:08:50,494 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 178 [2020-07-20 13:08:50,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:08:50,495 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:08:50,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 13:08:50,495 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:08:50,495 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:08:50,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:08:50,699 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:08:51,386 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 24 [2020-07-20 13:08:51,390 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-07-20 13:08:51,391 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-07-20 13:08:51,391 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-20 13:08:51,391 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-20 13:08:51,391 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (let ((.cse0 (<= |fibonacci_#in~n| fibonacci_~n)) (.cse1 (<= fibonacci_~n |fibonacci_#in~n|))) (or (and .cse0 (<= 2 |fibonacci_#t~ret0|) (<= 4 |fibonacci_#in~n|) (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 5)) .cse1) (and (<= 1 |fibonacci_#t~ret0|) .cse0 (<= 2 |fibonacci_#in~n|) (<= |fibonacci_#in~n| 2) .cse1) (and .cse0 (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 3)) (<= 3 fibonacci_~n) .cse1))) [2020-07-20 13:08:51,391 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-07-20 13:08:51,391 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-07-20 13:08:51,391 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-07-20 13:08:51,391 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:08:51,392 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:08:51,392 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:08:51,392 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-07-20 13:08:51,392 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-07-20 13:08:51,393 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-07-20 13:08:51,393 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-07-20 13:08:51,393 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-07-20 13:08:51,393 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-07-20 13:08:51,393 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-07-20 13:08:51,393 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-07-20 13:08:51,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:08:51 BoogieIcfgContainer [2020-07-20 13:08:51,400 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:08:51,402 INFO L168 Benchmark]: Toolchain (without parser) took 23541.08 ms. Allocated memory was 144.7 MB in the beginning and 404.8 MB in the end (delta: 260.0 MB). Free memory was 102.2 MB in the beginning and 144.4 MB in the end (delta: -42.2 MB). Peak memory consumption was 217.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:08:51,402 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 144.7 MB. Free memory is still 120.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 13:08:51,403 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.96 ms. Allocated memory is still 144.7 MB. Free memory was 101.8 MB in the beginning and 92.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:08:51,404 INFO L168 Benchmark]: Boogie Preprocessor took 23.77 ms. Allocated memory is still 144.7 MB. Free memory was 92.6 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:08:51,405 INFO L168 Benchmark]: RCFGBuilder took 353.95 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.3 MB in the beginning and 168.3 MB in the end (delta: -77.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:08:51,405 INFO L168 Benchmark]: TraceAbstraction took 22837.96 ms. Allocated memory was 201.9 MB in the beginning and 404.8 MB in the end (delta: 202.9 MB). Free memory was 168.3 MB in the beginning and 144.4 MB in the end (delta: 23.9 MB). Peak memory consumption was 226.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:08:51,408 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 144.7 MB. Free memory is still 120.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 318.96 ms. Allocated memory is still 144.7 MB. Free memory was 101.8 MB in the beginning and 92.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.77 ms. Allocated memory is still 144.7 MB. Free memory was 92.6 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 353.95 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.3 MB in the beginning and 168.3 MB in the end (delta: -77.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 22837.96 ms. Allocated memory was 201.9 MB in the beginning and 404.8 MB in the end (delta: 202.9 MB). Free memory was 168.3 MB in the beginning and 144.4 MB in the end (delta: 23.9 MB). Peak memory consumption was 226.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 22.0s, OverallIterations: 10, TraceHistogramMax: 25, AutomataDifference: 4.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 195 SDtfs, 516 SDslu, 1056 SDs, 0 SdLazy, 2211 SolverSat, 655 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1322 GetRequests, 990 SyntacticMatches, 97 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3216 ImplicationChecksByTransitivity, 4.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=9, 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, 10 MinimizatonAttempts, 39 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 116 PreInvPairs, 180 NumberOfFragments, 66 HoareAnnotationTreeSize, 116 FomulaSimplifications, 694 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 993 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 14.9s InterpolantComputationTime, 649 NumberOfCodeBlocks, 601 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 1225 ConstructedInterpolants, 0 QuantifiedInterpolants, 361614 SizeOfPredicates, 56 NumberOfNonLiveVariables, 1394 ConjunctsInSsa, 165 ConjunctsInUnsatCore, 17 InterpolantComputations, 3 PerfectInterpolantSequences, 3954/6480 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 correct! Received shutdown request...