/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:36:16,233 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:36:16,236 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:36:16,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:36:16,262 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:36:16,265 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:36:16,268 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:36:16,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:36:16,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:36:16,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:36:16,289 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:36:16,290 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:36:16,291 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:36:16,292 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:36:16,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:36:16,299 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:36:16,302 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:36:16,305 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:36:16,307 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:36:16,309 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:36:16,311 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:36:16,313 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:36:16,315 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:36:16,316 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:36:16,319 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:36:16,329 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:36:16,331 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:36:16,331 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:36:16,332 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 21:36:16,353 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:36:16,354 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:36:16,356 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:36:16,356 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:36:16,357 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:36:16,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:36:16,357 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:36:16,357 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:36:16,358 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:36:16,358 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:36:16,358 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:36:16,358 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:36:16,359 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:36:16,359 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:36:16,359 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:36:16,361 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:36:16,361 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:36:16,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:36:16,362 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:36:16,362 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:36:16,362 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:36:16,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:16,362 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:36:16,363 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:36:16,363 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:36:16,364 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:36:16,364 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:16,364 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:36:16,364 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:36:16,365 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 -> DAGSIZE 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 21:36:16,703 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:36:16,720 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:36:16,724 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:36:16,726 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:36:16,727 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:36:16,728 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-20 21:36:16,826 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44d62429b/679711c530e24cf18ba52942c6a47ee8/FLAG917266871 [2020-07-20 21:36:17,415 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:36:17,416 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-20 21:36:17,428 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44d62429b/679711c530e24cf18ba52942c6a47ee8/FLAG917266871 [2020-07-20 21:36:17,758 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44d62429b/679711c530e24cf18ba52942c6a47ee8 [2020-07-20 21:36:17,770 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:36:17,774 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:36:17,778 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:17,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:36:17,783 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:36:17,785 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:17" (1/1) ... [2020-07-20 21:36:17,789 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@767f5ff9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:17, skipping insertion in model container [2020-07-20 21:36:17,790 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:17" (1/1) ... [2020-07-20 21:36:17,800 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:36:17,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:36:18,054 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:18,058 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:36:18,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:18,089 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:36:18,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18 WrapperNode [2020-07-20 21:36:18,090 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:18,091 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:36:18,091 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:36:18,091 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:36:18,104 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,110 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,110 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,113 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,115 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (1/1) ... [2020-07-20 21:36:18,117 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:36:18,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:36:18,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:36:18,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:36:18,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (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 21:36:18,276 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:36:18,276 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:36:18,276 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:36:18,276 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:36:18,276 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:36:18,277 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:36:18,277 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:36:18,277 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:36:18,277 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:36:18,277 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:36:18,458 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:36:18,459 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:36:18,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:18 BoogieIcfgContainer [2020-07-20 21:36:18,462 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:36:18,464 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:36:18,464 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:36:18,467 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:36:18,468 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:36:17" (1/3) ... [2020-07-20 21:36:18,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@386831da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:18, skipping insertion in model container [2020-07-20 21:36:18,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:18" (2/3) ... [2020-07-20 21:36:18,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@386831da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:18, skipping insertion in model container [2020-07-20 21:36:18,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:18" (3/3) ... [2020-07-20 21:36:18,471 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-20 21:36:18,483 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:36:18,491 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:36:18,506 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:36:18,530 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:36:18,530 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:36:18,531 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:36:18,531 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:36:18,531 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:36:18,532 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:36:18,532 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:36:18,532 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:36:18,548 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:36:18,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:36:18,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:18,555 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:18,556 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:18,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:18,562 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:36:18,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:18,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063457996] [2020-07-20 21:36:18,571 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 21:36:18,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:18,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:18,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:36:18,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:18,834 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 21:36:18,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:18,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063457996] [2020-07-20 21:36:18,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:18,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:18,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380017623] [2020-07-20 21:36:18,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:18,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:18,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:18,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:18,870 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:36:18,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:18,964 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:36:18,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:18,966 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:36:18,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:18,976 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:36:18,976 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:36:18,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:36:18,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:36:19,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:36:19,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:36:19,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:36:19,029 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:36:19,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:19,029 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:36:19,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:19,030 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:36:19,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:36:19,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:19,032 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:19,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:19,247 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:19,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:19,248 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:36:19,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:19,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836592519] [2020-07-20 21:36:19,250 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 21:36:19,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:19,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:19,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:36:19,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:19,329 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 21:36:19,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:19,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836592519] [2020-07-20 21:36:19,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:19,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:19,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694213098] [2020-07-20 21:36:19,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:19,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:19,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:19,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:19,336 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:36:19,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:19,425 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:36:19,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:19,426 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:36:19,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:19,428 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:36:19,429 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:36:19,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:36:19,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:36:19,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:36:19,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:36:19,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:36:19,448 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:36:19,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:19,448 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:36:19,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:19,449 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:36:19,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:36:19,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:19,454 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:19,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:19,668 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:19,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:19,669 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:36:19,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:19,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874237895] [2020-07-20 21:36:19,671 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 21:36:19,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:19,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:19,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:19,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:19,757 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:36:19,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:19,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,040 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:36:20,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874237895] [2020-07-20 21:36:20,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:20,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:36:20,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119284733] [2020-07-20 21:36:20,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:36:20,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:20,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:36:20,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:20,045 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:36:20,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:20,192 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:36:20,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:36:20,192 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:36:20,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:20,195 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:36:20,195 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:36:20,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:20,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:36:20,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:36:20,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:36:20,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:36:20,207 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:36:20,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:20,208 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:36:20,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:36:20,208 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:36:20,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:20,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:20,210 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 21:36:20,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:20,412 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:20,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:20,413 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:36:20,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:20,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117008772] [2020-07-20 21:36:20,414 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 21:36:20,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:20,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:20,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:20,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:20,510 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 21:36:20,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:20,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,692 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:36:20,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117008772] [2020-07-20 21:36:20,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:20,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:36:20,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973166036] [2020-07-20 21:36:20,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:36:20,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:20,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:36:20,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:20,696 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:36:20,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:20,795 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:36:20,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:36:20,796 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:36:20,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:20,799 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:36:20,799 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:36:20,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:20,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:36:20,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:36:20,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:36:20,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:36:20,812 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:36:20,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:20,812 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:36:20,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:36:20,813 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:36:20,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:36:20,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:20,815 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:21,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:21,030 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:21,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:21,031 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:36:21,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:21,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422797703] [2020-07-20 21:36:21,032 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 21:36:21,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:21,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:21,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:21,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:21,128 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:36:21,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:21,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,519 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:36:21,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422797703] [2020-07-20 21:36:21,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:21,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:36:21,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586377134] [2020-07-20 21:36:21,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:21,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:21,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:21,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:21,525 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:36:21,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:21,708 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:36:21,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:21,708 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:36:21,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:21,711 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:36:21,712 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:36:21,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:21,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:36:21,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:36:21,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:36:21,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:36:21,724 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:36:21,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:21,724 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:36:21,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:21,725 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:36:21,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:36:21,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:21,727 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:21,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:21,932 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:21,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:21,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:36:21,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:21,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147821638] [2020-07-20 21:36:21,934 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 21:36:21,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:21,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:21,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:21,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:22,031 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:36:22,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:22,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,391 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:36:22,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147821638] [2020-07-20 21:36:22,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:22,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:36:22,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448616845] [2020-07-20 21:36:22,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:22,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:22,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:22,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:22,394 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:36:22,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:22,549 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:36:22,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:22,550 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:36:22,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:22,559 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:36:22,559 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:36:22,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:22,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:36:22,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:36:22,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:36:22,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:36:22,586 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:36:22,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:22,587 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:36:22,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:22,587 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:36:22,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:36:22,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:22,595 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:22,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:22,811 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:22,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:22,812 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:36:22,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:22,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161339504] [2020-07-20 21:36:22,813 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 21:36:22,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:22,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:22,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:22,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:36:22,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:23,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,591 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:36:23,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161339504] [2020-07-20 21:36:23,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:23,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:36:23,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084955814] [2020-07-20 21:36:23,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:23,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:23,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:23,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:23,594 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:36:23,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:23,758 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:36:23,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:23,759 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:36:23,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:23,762 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:36:23,762 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:36:23,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:23,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:36:23,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:36:23,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:36:23,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:36:23,777 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:36:23,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:23,778 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:36:23,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:23,778 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:36:23,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:36:23,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:23,781 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:23,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:23,997 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:23,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:23,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:36:23,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:23,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031395721] [2020-07-20 21:36:24,000 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 21:36:24,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:24,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:24,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:24,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:24,147 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:36:24,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:24,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,903 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:36:24,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031395721] [2020-07-20 21:36:24,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:24,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-20 21:36:24,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978141146] [2020-07-20 21:36:24,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:24,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:24,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:24,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:24,912 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-20 21:36:25,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:25,075 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:36:25,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:25,079 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-20 21:36:25,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:25,081 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:36:25,082 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:36:25,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:36:25,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:36:25,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:36:25,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:36:25,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:36:25,098 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:36:25,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:25,099 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:36:25,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:25,100 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:36:25,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:36:25,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:25,103 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:25,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:25,318 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:25,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:25,319 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:36:25,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:25,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288823928] [2020-07-20 21:36:25,321 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 21:36:25,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:25,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:25,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:25,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:25,514 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:36:25,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:26,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:36:26,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288823928] [2020-07-20 21:36:26,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:26,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 21:36:26,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081796524] [2020-07-20 21:36:26,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:26,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:26,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:26,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:26,631 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-20 21:36:26,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:26,917 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:36:26,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:26,918 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-20 21:36:26,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:26,921 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:36:26,922 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:36:26,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:26,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:36:26,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:36:26,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:36:26,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:36:26,938 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:36:26,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:26,939 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:36:26,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:26,939 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:36:26,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:36:26,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:26,943 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:27,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:27,160 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:27,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:27,161 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:36:27,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:27,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71111290] [2020-07-20 21:36:27,162 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 21:36:27,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:27,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:27,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:27,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:27,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-20 21:36:27,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:28,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-20 21:36:28,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71111290] [2020-07-20 21:36:28,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:28,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 21:36:28,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703573321] [2020-07-20 21:36:28,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:28,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:28,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:28,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:28,689 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-20 21:36:28,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:28,968 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-20 21:36:28,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:28,969 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-20 21:36:28,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:28,972 INFO L225 Difference]: With dead ends: 88 [2020-07-20 21:36:28,972 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 21:36:28,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:28,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 21:36:28,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-20 21:36:28,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 21:36:28,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-20 21:36:28,991 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-20 21:36:28,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:28,992 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-20 21:36:28,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:28,993 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-20 21:36:28,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 21:36:28,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:28,999 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:29,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:29,214 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:29,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:29,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-20 21:36:29,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:29,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455299090] [2020-07-20 21:36:29,216 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:29,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:29,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:29,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:29,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:29,401 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 104 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-20 21:36:29,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:30,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,527 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-20 21:36:30,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455299090] [2020-07-20 21:36:30,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:30,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 21:36:30,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677323529] [2020-07-20 21:36:30,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:30,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:30,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:30,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:30,532 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-20 21:36:30,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:30,755 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-20 21:36:30,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:30,757 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-20 21:36:30,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:30,760 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:36:30,760 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 21:36:30,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:30,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 21:36:30,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-20 21:36:30,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 21:36:30,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-20 21:36:30,773 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-20 21:36:30,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:30,773 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-20 21:36:30,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:30,774 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-20 21:36:30,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 21:36:30,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:30,777 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:30,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:30,986 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:30,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:30,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-20 21:36:30,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:30,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [913995164] [2020-07-20 21:36:30,988 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:31,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:31,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:31,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 21:36:31,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:31,273 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-20 21:36:31,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:32,256 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-20 21:36:32,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [913995164] [2020-07-20 21:36:32,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:32,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-20 21:36:32,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527387941] [2020-07-20 21:36:32,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:36:32,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:32,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:36:32,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:32,259 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-20 21:36:32,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:32,617 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-20 21:36:32,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 21:36:32,619 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-20 21:36:32,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:32,626 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:36:32,627 INFO L226 Difference]: Without dead ends: 105 [2020-07-20 21:36:32,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:36:32,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-20 21:36:32,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-20 21:36:32,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 21:36:32,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-20 21:36:32,682 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-20 21:36:32,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:32,682 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-20 21:36:32,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:36:32,683 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-20 21:36:32,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:32,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:32,687 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:32,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:32,903 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:32,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:32,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 7 times [2020-07-20 21:36:32,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:32,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875011367] [2020-07-20 21:36:32,906 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:33,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:33,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:33,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:33,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:33,154 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 21:36:33,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:33,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,170 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 21:36:34,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875011367] [2020-07-20 21:36:34,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:34,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 21:36:34,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408940621] [2020-07-20 21:36:34,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:34,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:34,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:34,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:34,174 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-20 21:36:34,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:34,412 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-20 21:36:34,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:34,412 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 21:36:34,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:34,415 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:36:34,415 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 21:36:34,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:36:34,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 21:36:34,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-20 21:36:34,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:36:34,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-20 21:36:34,430 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-20 21:36:34,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:34,431 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-20 21:36:34,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:34,432 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-20 21:36:34,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:34,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:34,435 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:34,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:34,649 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:34,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:34,650 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 8 times [2020-07-20 21:36:34,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:34,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315589448] [2020-07-20 21:36:34,651 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:34,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:34,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:34,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:34,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:34,863 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 21:36:34,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:35,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,725 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 21:36:35,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315589448] [2020-07-20 21:36:35,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:35,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 21:36:35,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163490836] [2020-07-20 21:36:35,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:35,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:35,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:35,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:35,729 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-20 21:36:35,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:35,926 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-20 21:36:35,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:35,927 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 21:36:35,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:35,929 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:35,930 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 21:36:35,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:36:35,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 21:36:35,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-20 21:36:35,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:36:35,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-20 21:36:35,943 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-20 21:36:35,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:35,943 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-20 21:36:35,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:35,944 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-20 21:36:35,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 21:36:35,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:35,946 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:36,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:36,160 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:36,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:36,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 9 times [2020-07-20 21:36:36,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:36,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596696962] [2020-07-20 21:36:36,162 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:36,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:36,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:36,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:36,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:36,349 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 198 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2020-07-20 21:36:36,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:37,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,516 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-20 21:36:37,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596696962] [2020-07-20 21:36:37,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:37,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 21:36:37,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684178328] [2020-07-20 21:36:37,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:37,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:37,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:37,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:37,520 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-20 21:36:37,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:37,775 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-20 21:36:37,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:37,776 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-20 21:36:37,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:37,779 INFO L225 Difference]: With dead ends: 109 [2020-07-20 21:36:37,779 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:36:37,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:37,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:36:37,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-20 21:36:37,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 21:36:37,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-20 21:36:37,800 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-20 21:36:37,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:37,801 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-20 21:36:37,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:37,802 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-20 21:36:37,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:37,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:37,806 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,019 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 10 times [2020-07-20 21:36:38,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571155859] [2020-07-20 21:36:38,020 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:38,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,262 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 21:36:38,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:38,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 21:36:39,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571155859] [2020-07-20 21:36:39,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:39,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 21:36:39,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359164962] [2020-07-20 21:36:39,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:39,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:39,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:39,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:39,193 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-20 21:36:39,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,361 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-20 21:36:39,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:39,362 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 21:36:39,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,369 INFO L225 Difference]: With dead ends: 75 [2020-07-20 21:36:39,369 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:36:39,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:36:39,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:36:39,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-20 21:36:39,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 21:36:39,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-20 21:36:39,385 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-20 21:36:39,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,386 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-20 21:36:39,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:39,387 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-20 21:36:39,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:39,390 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:39,390 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:39,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,604 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,605 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 11 times [2020-07-20 21:36:39,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229264035] [2020-07-20 21:36:39,606 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,825 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-20 21:36:39,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:40,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:40,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:41,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:41,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:41,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:41,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:41,197 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-20 21:36:41,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229264035] [2020-07-20 21:36:41,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:41,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-20 21:36:41,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244981233] [2020-07-20 21:36:41,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:36:41,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:41,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:36:41,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:36:41,200 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-20 21:36:41,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:41,413 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-20 21:36:41,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:41,415 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-20 21:36:41,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:41,416 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:36:41,416 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:36:41,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:36:41,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:36:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:36:41,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:36:41,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:36:41,420 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-20 21:36:41,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:41,421 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:36:41,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:36:41,421 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:36:41,421 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:36:41,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:41,627 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:36:42,107 WARN L193 SmtUtils]: Spent 411.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 34 [2020-07-20 21:36:42,417 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 67 [2020-07-20 21:36:42,527 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 42 [2020-07-20 21:36:42,671 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-20 21:36:42,796 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 56 [2020-07-20 21:36:43,179 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-20 21:36:43,282 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-20 21:36:45,297 WARN L193 SmtUtils]: Spent 728.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 31 [2020-07-20 21:36:45,320 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:36:45,320 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:45,320 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:45,321 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:36:45,321 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:36:45,321 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:36:45,321 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-20 21:36:45,321 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-20 21:36:45,322 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-20 21:36:45,323 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse0 (and (= |fibo_#t~ret0| 2) (<= |fibo_#in~n| 4))) (.cse1 (<= |fibo_#in~n| 3))) (and (or .cse0 (and (<= 3 |fibo_#in~n|) .cse1) (<= 5 |fibo_#in~n|) (and (<= |fibo_#in~n| 2) (<= 2 |fibo_#in~n|))) (or .cse0 (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3) .cse1) (let ((.cse2 (<= fibo_~n |fibo_#in~n|)) (.cse3 (<= |fibo_#in~n| fibo_~n))) (or (and (<= 4 |fibo_#in~n|) .cse2 .cse3) (and (= |fibo_#t~ret0| 1) .cse2 .cse3))))) [2020-07-20 21:36:45,323 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-20 21:36:45,323 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-20 21:36:45,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:45 BoogieIcfgContainer [2020-07-20 21:36:45,328 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:45,330 INFO L168 Benchmark]: Toolchain (without parser) took 27558.18 ms. Allocated memory was 144.7 MB in the beginning and 451.4 MB in the end (delta: 306.7 MB). Free memory was 101.3 MB in the beginning and 215.3 MB in the end (delta: -114.0 MB). Peak memory consumption was 323.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,331 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,331 INFO L168 Benchmark]: CACSL2BoogieTranslator took 312.48 ms. Allocated memory is still 144.7 MB. Free memory was 100.9 MB in the beginning and 91.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,332 INFO L168 Benchmark]: Boogie Preprocessor took 26.73 ms. Allocated memory is still 144.7 MB. Free memory was 91.7 MB in the beginning and 90.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,333 INFO L168 Benchmark]: RCFGBuilder took 344.56 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 90.3 MB in the beginning and 169.6 MB in the end (delta: -79.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,333 INFO L168 Benchmark]: TraceAbstraction took 26864.80 ms. Allocated memory was 201.9 MB in the beginning and 451.4 MB in the end (delta: 249.6 MB). Free memory was 169.6 MB in the beginning and 215.3 MB in the end (delta: -45.7 MB). Peak memory consumption was 334.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:45,336 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 312.48 ms. Allocated memory is still 144.7 MB. Free memory was 100.9 MB in the beginning and 91.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.73 ms. Allocated memory is still 144.7 MB. Free memory was 91.7 MB in the beginning and 90.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 344.56 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 90.3 MB in the beginning and 169.6 MB in the end (delta: -79.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26864.80 ms. Allocated memory was 201.9 MB in the beginning and 451.4 MB in the end (delta: 249.6 MB). Free memory was 169.6 MB in the beginning and 215.3 MB in the end (delta: -45.7 MB). Peak memory consumption was 334.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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: 23.0s, OverallIterations: 17, TraceHistogramMax: 27, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 377 SDtfs, 425 SDslu, 1645 SDs, 0 SdLazy, 1634 SolverSat, 429 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2958 GetRequests, 2601 SyntacticMatches, 123 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 3.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 17 MinimizatonAttempts, 135 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1452 NumberOfFragments, 86 HoareAnnotationTreeSize, 95 FomulaSimplifications, 595296 FormulaSimplificationTreeSizeReduction, 2.9s HoareSimplificationTime, 8 FomulaSimplificationsInter, 5107 FormulaSimplificationTreeSizeReductionInter, 0.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 14.1s InterpolantComputationTime, 1467 NumberOfCodeBlocks, 1138 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 2875 ConstructedInterpolants, 0 QuantifiedInterpolants, 609941 SizeOfPredicates, 73 NumberOfNonLiveVariables, 2824 ConjunctsInSsa, 213 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 12357/16608 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...