/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/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:09:29,314 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:09:29,317 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:09:29,330 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:09:29,330 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:09:29,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:09:29,333 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:09:29,335 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:09:29,337 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:09:29,338 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:09:29,339 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:09:29,340 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:09:29,341 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:09:29,342 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:09:29,343 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:09:29,344 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:09:29,345 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:09:29,346 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:09:29,348 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:09:29,350 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:09:29,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:09:29,353 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:09:29,354 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:09:29,355 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:09:29,358 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:09:29,367 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:09:29,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:09:29,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:09:29,370 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 21:09:29,385 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:09:29,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:09:29,387 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:09:29,387 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:09:29,387 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:09:29,387 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:09:29,387 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:09:29,388 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:09:29,388 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:09:29,388 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:09:29,388 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:09:29,388 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:09:29,389 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:09:29,389 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:09:29,389 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:09:29,389 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:09:29,389 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:09:29,390 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:09:29,390 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:09:29,390 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:09:29,390 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:09:29,391 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:09:29,391 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:09:29,391 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:09:29,391 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:09:29,391 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:09:29,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:29,392 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:09:29,392 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:09:29,392 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 21:09:29,684 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:09:29,699 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:09:29,703 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:09:29,705 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:09:29,705 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:09:29,706 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-20 21:09:29,777 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f15b957d1/9acc41a18e164eb29aee2dfd8cd493d6/FLAG1b114bf72 [2020-07-20 21:09:30,261 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:09:30,262 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-20 21:09:30,270 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f15b957d1/9acc41a18e164eb29aee2dfd8cd493d6/FLAG1b114bf72 [2020-07-20 21:09:30,675 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f15b957d1/9acc41a18e164eb29aee2dfd8cd493d6 [2020-07-20 21:09:30,686 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:09:30,689 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:09:30,690 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:09:30,690 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:09:30,694 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:09:30,695 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:30,699 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e755a08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30, skipping insertion in model container [2020-07-20 21:09:30,699 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:30,708 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:09:30,726 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:09:30,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:09:30,933 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:09:30,952 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:09:30,968 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:09:30,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30 WrapperNode [2020-07-20 21:09:30,969 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:09:30,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:09:30,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:09:30,970 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:09:30,985 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:30,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,077 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,081 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,083 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (1/1) ... [2020-07-20 21:09:31,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:09:31,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:09:31,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:09:31,087 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:09:31,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (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 21:09:31,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:09:31,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:09:31,148 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-20 21:09:31,148 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:09:31,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:09:31,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:09:31,149 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-20 21:09:31,149 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:09:31,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:09:31,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:09:31,351 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:09:31,352 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:09:31,356 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:09:31 BoogieIcfgContainer [2020-07-20 21:09:31,356 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:09:31,358 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:09:31,358 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:09:31,361 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:09:31,362 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:09:30" (1/3) ... [2020-07-20 21:09:31,363 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233bfa01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:09:31, skipping insertion in model container [2020-07-20 21:09:31,363 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:09:30" (2/3) ... [2020-07-20 21:09:31,363 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@233bfa01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:09:31, skipping insertion in model container [2020-07-20 21:09:31,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:09:31" (3/3) ... [2020-07-20 21:09:31,365 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-07-20 21:09:31,379 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:09:31,388 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:09:31,424 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:09:31,500 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:09:31,500 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:09:31,500 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:09:31,501 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:09:31,501 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:09:31,501 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:09:31,501 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:09:31,501 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:09:31,537 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:09:31,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:09:31,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:31,551 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:31,552 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:31,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:31,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-07-20 21:09:31,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:31,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275463985] [2020-07-20 21:09:31,568 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 21:09:31,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:09:31,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:31,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:09:31,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:31,779 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 21:09:31,780 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:09:31,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275463985] [2020-07-20 21:09:31,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:09:31,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 21:09:31,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773861495] [2020-07-20 21:09:31,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 21:09:31,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:31,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 21:09:31,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:09:31,804 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-07-20 21:09:31,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:31,984 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-07-20 21:09:31,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:09:31,986 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-20 21:09:31,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:31,998 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:09:31,999 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 21:09:32,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 21:09:32,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 21:09:32,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 21:09:32,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 21:09:32,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-20 21:09:32,057 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-07-20 21:09:32,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:32,058 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-20 21:09:32,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 21:09:32,059 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-20 21:09:32,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 21:09:32,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:32,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:32,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:32,275 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:32,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:32,276 INFO L82 PathProgramCache]: Analyzing trace with hash -509871596, now seen corresponding path program 1 times [2020-07-20 21:09:32,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:32,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893566070] [2020-07-20 21:09:32,277 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 21:09:32,308 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:32,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:32,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:09:32,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:32,371 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 21:09:32,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:09:32,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893566070] [2020-07-20 21:09:32,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:09:32,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 21:09:32,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724815098] [2020-07-20 21:09:32,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 21:09:32,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:32,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 21:09:32,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:09:32,376 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-20 21:09:32,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:32,475 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-07-20 21:09:32,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:09:32,475 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-20 21:09:32,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:32,477 INFO L225 Difference]: With dead ends: 28 [2020-07-20 21:09:32,477 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 21:09:32,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 21:09:32,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 21:09:32,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-20 21:09:32,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 21:09:32,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-20 21:09:32,486 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2020-07-20 21:09:32,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:32,487 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-20 21:09:32,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 21:09:32,487 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-20 21:09:32,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:09:32,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:32,489 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 21:09:32,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:32,702 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:32,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:32,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-07-20 21:09:32,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:32,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19472082] [2020-07-20 21:09:32,709 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 21:09:32,761 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:32,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:32,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:09:32,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:32,934 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 21:09:32,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:33,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:33,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:33,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:33,440 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:09:33,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19472082] [2020-07-20 21:09:33,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:33,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-20 21:09:33,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350095625] [2020-07-20 21:09:33,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:09:33,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:33,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:09:33,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:09:33,447 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 17 states. [2020-07-20 21:09:33,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:33,686 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2020-07-20 21:09:33,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:09:33,687 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 27 [2020-07-20 21:09:33,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:33,689 INFO L225 Difference]: With dead ends: 34 [2020-07-20 21:09:33,689 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:09:33,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:09:33,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:09:33,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2020-07-20 21:09:33,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 21:09:33,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2020-07-20 21:09:33,699 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 27 [2020-07-20 21:09:33,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:33,700 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2020-07-20 21:09:33,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:09:33,700 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2020-07-20 21:09:33,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 21:09:33,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:33,702 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:33,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:33,905 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:33,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:33,906 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-07-20 21:09:33,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:33,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479744505] [2020-07-20 21:09:33,908 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 21:09:33,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:33,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:33,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:09:33,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:34,047 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 21:09:34,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:34,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:34,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:34,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:34,466 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:09:34,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479744505] [2020-07-20 21:09:34,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:34,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-20 21:09:34,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34816822] [2020-07-20 21:09:34,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:09:34,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:34,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:09:34,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:09:34,469 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 17 states. [2020-07-20 21:09:34,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:34,762 INFO L93 Difference]: Finished difference Result 39 states and 56 transitions. [2020-07-20 21:09:34,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:09:34,764 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2020-07-20 21:09:34,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:34,767 INFO L225 Difference]: With dead ends: 39 [2020-07-20 21:09:34,768 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 21:09:34,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:09:34,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 21:09:34,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-07-20 21:09:34,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 21:09:34,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 51 transitions. [2020-07-20 21:09:34,794 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 51 transitions. Word has length 28 [2020-07-20 21:09:34,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:34,794 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 51 transitions. [2020-07-20 21:09:34,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:09:34,795 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 51 transitions. [2020-07-20 21:09:34,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:09:34,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:34,802 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:35,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:35,017 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:35,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:35,018 INFO L82 PathProgramCache]: Analyzing trace with hash -928122994, now seen corresponding path program 2 times [2020-07-20 21:09:35,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:35,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376529470] [2020-07-20 21:09:35,019 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 21:09:35,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:35,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:35,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:09:35,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:35,099 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:09:35,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:35,317 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:09:35,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376529470] [2020-07-20 21:09:35,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:35,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2020-07-20 21:09:35,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023214668] [2020-07-20 21:09:35,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:09:35,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:35,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:09:35,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:09:35,324 INFO L87 Difference]: Start difference. First operand 34 states and 51 transitions. Second operand 11 states. [2020-07-20 21:09:35,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:35,524 INFO L93 Difference]: Finished difference Result 68 states and 116 transitions. [2020-07-20 21:09:35,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:09:35,525 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:09:35,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:35,527 INFO L225 Difference]: With dead ends: 68 [2020-07-20 21:09:35,527 INFO L226 Difference]: Without dead ends: 41 [2020-07-20 21:09:35,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:09:35,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-20 21:09:35,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-07-20 21:09:35,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 21:09:35,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2020-07-20 21:09:35,542 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 41 [2020-07-20 21:09:35,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:35,543 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2020-07-20 21:09:35,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:09:35,543 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2020-07-20 21:09:35,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:09:35,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:35,546 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:35,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:35,761 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:35,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:35,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1952548262, now seen corresponding path program 2 times [2020-07-20 21:09:35,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:35,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588836576] [2020-07-20 21:09:35,762 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 21:09:35,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:35,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:35,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 21:09:35,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:35,839 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 21:09:35,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:09:35,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588836576] [2020-07-20 21:09:35,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:09:35,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 21:09:35,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345801862] [2020-07-20 21:09:35,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 21:09:35,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:35,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 21:09:35,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:09:35,842 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand 6 states. [2020-07-20 21:09:35,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:35,936 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2020-07-20 21:09:35,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:09:35,937 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-07-20 21:09:35,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:35,938 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:09:35,938 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 21:09:35,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:09:35,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 21:09:35,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 21:09:35,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:09:35,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2020-07-20 21:09:35,948 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 40 [2020-07-20 21:09:35,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:35,948 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2020-07-20 21:09:35,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 21:09:35,949 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2020-07-20 21:09:35,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:09:35,950 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:35,950 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:36,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:36,154 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:36,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:36,155 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 3 times [2020-07-20 21:09:36,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:36,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350306951] [2020-07-20 21:09:36,157 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 21:09:36,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:36,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:36,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:09:36,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:36,261 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 12 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:09:36,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:36,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:36,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:36,537 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 21:09:36,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350306951] [2020-07-20 21:09:36,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:36,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:09:36,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547658916] [2020-07-20 21:09:36,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:09:36,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:36,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:09:36,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:09:36,540 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand 11 states. [2020-07-20 21:09:36,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:36,675 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2020-07-20 21:09:36,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:09:36,676 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:09:36,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:36,678 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:09:36,678 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:09:36,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:09:36,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:09:36,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 21:09:36,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 21:09:36,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-20 21:09:36,685 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 41 [2020-07-20 21:09:36,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:36,685 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-20 21:09:36,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:09:36,686 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-20 21:09:36,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 21:09:36,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:36,687 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:36,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:36,903 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:36,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:36,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 4 times [2020-07-20 21:09:36,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:36,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876417387] [2020-07-20 21:09:36,904 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 21:09:36,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:36,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:36,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 21:09:36,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:37,094 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:09:37,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:37,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:37,840 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 21:09:37,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876417387] [2020-07-20 21:09:37,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:37,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 23 [2020-07-20 21:09:37,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2628704] [2020-07-20 21:09:37,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:09:37,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:37,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:09:37,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:09:37,843 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 23 states. [2020-07-20 21:09:38,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:38,254 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2020-07-20 21:09:38,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 21:09:38,255 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 42 [2020-07-20 21:09:38,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:38,257 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:09:38,257 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 21:09:38,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 54 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=204, Invalid=918, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 21:09:38,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 21:09:38,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2020-07-20 21:09:38,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 21:09:38,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2020-07-20 21:09:38,272 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 42 [2020-07-20 21:09:38,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:38,273 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2020-07-20 21:09:38,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:09:38,273 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2020-07-20 21:09:38,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-07-20 21:09:38,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:38,276 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:38,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:38,490 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:38,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:38,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1434057987, now seen corresponding path program 5 times [2020-07-20 21:09:38,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:38,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024742231] [2020-07-20 21:09:38,493 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 21:09:38,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:38,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:38,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:09:38,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:38,653 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-07-20 21:09:38,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:38,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:39,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:39,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:39,159 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-20 21:09:39,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024742231] [2020-07-20 21:09:39,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:39,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:09:39,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781581366] [2020-07-20 21:09:39,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:09:39,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:39,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:09:39,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:09:39,161 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand 13 states. [2020-07-20 21:09:39,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:39,407 INFO L93 Difference]: Finished difference Result 88 states and 136 transitions. [2020-07-20 21:09:39,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:09:39,407 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 83 [2020-07-20 21:09:39,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:39,409 INFO L225 Difference]: With dead ends: 88 [2020-07-20 21:09:39,409 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 21:09:39,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 145 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:09:39,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 21:09:39,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2020-07-20 21:09:39,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:09:39,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 59 transitions. [2020-07-20 21:09:39,434 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 59 transitions. Word has length 83 [2020-07-20 21:09:39,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:39,435 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 59 transitions. [2020-07-20 21:09:39,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:09:39,435 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 59 transitions. [2020-07-20 21:09:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-20 21:09:39,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:39,439 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:39,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:39,641 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:39,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:39,641 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 6 times [2020-07-20 21:09:39,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:39,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088211444] [2020-07-20 21:09:39,643 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 21:09:39,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:39,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:39,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:09:39,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:39,835 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 170 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2020-07-20 21:09:39,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:40,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:40,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:40,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:40,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:40,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:40,709 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 182 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-20 21:09:40,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088211444] [2020-07-20 21:09:40,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:40,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:09:40,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140799738] [2020-07-20 21:09:40,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:09:40,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:40,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:09:40,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:09:40,711 INFO L87 Difference]: Start difference. First operand 46 states and 59 transitions. Second operand 17 states. [2020-07-20 21:09:41,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:41,149 INFO L93 Difference]: Finished difference Result 106 states and 164 transitions. [2020-07-20 21:09:41,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:09:41,149 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 97 [2020-07-20 21:09:41,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:41,152 INFO L225 Difference]: With dead ends: 106 [2020-07-20 21:09:41,152 INFO L226 Difference]: Without dead ends: 69 [2020-07-20 21:09:41,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 169 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:09:41,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-20 21:09:41,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2020-07-20 21:09:41,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:09:41,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 84 transitions. [2020-07-20 21:09:41,166 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 84 transitions. Word has length 97 [2020-07-20 21:09:41,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:41,167 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 84 transitions. [2020-07-20 21:09:41,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:09:41,167 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 84 transitions. [2020-07-20 21:09:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-20 21:09:41,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:41,169 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:41,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:41,376 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:41,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:41,377 INFO L82 PathProgramCache]: Analyzing trace with hash -680629368, now seen corresponding path program 7 times [2020-07-20 21:09:41,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:41,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29149149] [2020-07-20 21:09:41,378 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 21:09:41,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:41,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:41,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:09:41,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:41,573 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 276 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2020-07-20 21:09:41,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:42,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:42,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:43,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:43,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:43,090 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 306 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 21:09:43,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29149149] [2020-07-20 21:09:43,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:43,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:09:43,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251841294] [2020-07-20 21:09:43,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:09:43,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:43,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:09:43,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:09:43,092 INFO L87 Difference]: Start difference. First operand 60 states and 84 transitions. Second operand 21 states. [2020-07-20 21:09:43,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:43,683 INFO L93 Difference]: Finished difference Result 130 states and 222 transitions. [2020-07-20 21:09:43,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 21:09:43,685 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 124 [2020-07-20 21:09:43,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:43,687 INFO L225 Difference]: With dead ends: 130 [2020-07-20 21:09:43,687 INFO L226 Difference]: Without dead ends: 79 [2020-07-20 21:09:43,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 211 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 21:09:43,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-20 21:09:43,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-20 21:09:43,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 21:09:43,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 97 transitions. [2020-07-20 21:09:43,714 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 97 transitions. Word has length 124 [2020-07-20 21:09:43,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:43,715 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 97 transitions. [2020-07-20 21:09:43,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:09:43,715 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 97 transitions. [2020-07-20 21:09:43,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 21:09:43,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:43,722 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 23, 14, 14, 14, 14, 14, 14, 14, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:43,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:43,937 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:43,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:43,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1288458278, now seen corresponding path program 8 times [2020-07-20 21:09:43,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:43,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128481551] [2020-07-20 21:09:43,939 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 21:09:44,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:09:44,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:44,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:09:44,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:44,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 453 proven. 730 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2020-07-20 21:09:44,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:45,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:45,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:45,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:45,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 453 proven. 782 refuted. 0 times theorem prover too weak. 1006 trivial. 0 not checked. [2020-07-20 21:09:46,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128481551] [2020-07-20 21:09:46,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:46,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:09:46,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057362796] [2020-07-20 21:09:46,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:09:46,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:46,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:09:46,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:09:46,822 INFO L87 Difference]: Start difference. First operand 72 states and 97 transitions. Second operand 25 states. [2020-07-20 21:09:47,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:47,704 INFO L93 Difference]: Finished difference Result 157 states and 259 transitions. [2020-07-20 21:09:47,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 21:09:47,705 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 205 [2020-07-20 21:09:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:47,707 INFO L225 Difference]: With dead ends: 157 [2020-07-20 21:09:47,708 INFO L226 Difference]: Without dead ends: 94 [2020-07-20 21:09:47,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 21:09:47,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-20 21:09:47,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2020-07-20 21:09:47,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-07-20 21:09:47,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 112 transitions. [2020-07-20 21:09:47,734 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 112 transitions. Word has length 205 [2020-07-20 21:09:47,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:47,735 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 112 transitions. [2020-07-20 21:09:47,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:09:47,735 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 112 transitions. [2020-07-20 21:09:47,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-20 21:09:47,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:09:47,738 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:09:47,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:47,949 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:09:47,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:09:47,950 INFO L82 PathProgramCache]: Analyzing trace with hash 375112636, now seen corresponding path program 9 times [2020-07-20 21:09:47,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:09:47,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424635644] [2020-07-20 21:09:47,951 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 21:09:48,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:09:48,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:09:48,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 21:09:48,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:09:48,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 258 proven. 604 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-07-20 21:09:48,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:09:49,556 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 21:09:49,688 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 21:09:49,836 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 21:09:50,003 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 21:09:50,674 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 21:09:50,946 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 21:09:51,233 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-20 21:09:51,524 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-20 21:09:53,938 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 21:09:54,074 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 21:09:54,220 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 21:09:54,365 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 21:09:54,497 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 21:09:54,599 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 21:09:55,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:55,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:55,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:55,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:55,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:56,953 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 60 [2020-07-20 21:09:57,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:57,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:09:58,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 207 proven. 695 refuted. 0 times theorem prover too weak. 752 trivial. 0 not checked. [2020-07-20 21:09:58,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424635644] [2020-07-20 21:09:58,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:09:58,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 35] total 48 [2020-07-20 21:09:58,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434204958] [2020-07-20 21:09:58,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 21:09:58,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:09:58,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 21:09:58,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1962, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 21:09:58,322 INFO L87 Difference]: Start difference. First operand 84 states and 112 transitions. Second operand 48 states. [2020-07-20 21:09:59,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:09:59,467 INFO L93 Difference]: Finished difference Result 90 states and 121 transitions. [2020-07-20 21:09:59,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 21:09:59,468 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 178 [2020-07-20 21:09:59,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:09:59,469 INFO L225 Difference]: With dead ends: 90 [2020-07-20 21:09:59,470 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:09:59,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 268 SyntacticMatches, 41 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2291 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=658, Invalid=4034, Unknown=0, NotChecked=0, Total=4692 [2020-07-20 21:09:59,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:09:59,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:09:59,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:09:59,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:09:59,473 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 178 [2020-07-20 21:09:59,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:09:59,473 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:09:59,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 21:09:59,473 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:09:59,473 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:09:59,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:09:59,684 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:10:00,200 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 7 [2020-07-20 21:10:00,586 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 19 [2020-07-20 21:10:00,590 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-07-20 21:10:00,590 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-07-20 21:10:00,591 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-20 21:10:00,591 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-20 21:10:00,591 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (and (<= 1 |fibonacci_#t~ret0|) (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (or (and (<= 2 |fibonacci_#t~ret0|) (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 5))) (<= |fibonacci_#in~n| 3)) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-20 21:10:00,591 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-07-20 21:10:00,591 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-07-20 21:10:00,591 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-07-20 21:10:00,592 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-07-20 21:10:00,592 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:10:00,592 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:10:00,592 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:10:00,592 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:10:00,592 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:10:00,592 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:10:00,592 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-07-20 21:10:00,593 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-07-20 21:10:00,593 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-07-20 21:10:00,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:10:00 BoogieIcfgContainer [2020-07-20 21:10:00,601 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:10:00,610 INFO L168 Benchmark]: Toolchain (without parser) took 29915.70 ms. Allocated memory was 142.6 MB in the beginning and 456.1 MB in the end (delta: 313.5 MB). Free memory was 100.6 MB in the beginning and 330.8 MB in the end (delta: -230.2 MB). Peak memory consumption was 316.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,612 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 142.6 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,615 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.41 ms. Allocated memory is still 142.6 MB. Free memory was 100.2 MB in the beginning and 90.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,619 INFO L168 Benchmark]: Boogie Preprocessor took 116.46 ms. Allocated memory was 142.6 MB in the beginning and 200.3 MB in the end (delta: 57.7 MB). Free memory was 90.8 MB in the beginning and 179.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,622 INFO L168 Benchmark]: RCFGBuilder took 269.74 ms. Allocated memory is still 200.3 MB. Free memory was 179.0 MB in the beginning and 166.4 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,623 INFO L168 Benchmark]: TraceAbstraction took 29243.66 ms. Allocated memory was 200.3 MB in the beginning and 456.1 MB in the end (delta: 255.9 MB). Free memory was 165.7 MB in the beginning and 330.8 MB in the end (delta: -165.2 MB). Peak memory consumption was 324.3 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:00,625 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 142.6 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.41 ms. Allocated memory is still 142.6 MB. Free memory was 100.2 MB in the beginning and 90.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.46 ms. Allocated memory was 142.6 MB in the beginning and 200.3 MB in the end (delta: 57.7 MB). Free memory was 90.8 MB in the beginning and 179.0 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 269.74 ms. Allocated memory is still 200.3 MB. Free memory was 179.0 MB in the beginning and 166.4 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 29243.66 ms. Allocated memory was 200.3 MB in the beginning and 456.1 MB in the end (delta: 255.9 MB). Free memory was 165.7 MB in the beginning and 330.8 MB in the end (delta: -165.2 MB). Peak memory consumption was 324.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 28.1s, OverallIterations: 13, TraceHistogramMax: 29, AutomataDifference: 5.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 258 SDtfs, 932 SDslu, 1278 SDs, 0 SdLazy, 2246 SolverSat, 1144 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1912 GetRequests, 1478 SyntacticMatches, 127 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3565 ImplicationChecksByTransitivity, 5.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=84occurred 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: 0.1s AutomataMinimizationTime, 13 MinimizatonAttempts, 45 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 167 PreInvPairs, 212 NumberOfFragments, 42 HoareAnnotationTreeSize, 167 FomulaSimplifications, 434 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 1548 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 19.2s InterpolantComputationTime, 935 NumberOfCodeBlocks, 756 NumberOfCodeBlocksAsserted, 39 NumberOfCheckSat, 1778 ConstructedInterpolants, 0 QuantifiedInterpolants, 542826 SizeOfPredicates, 78 NumberOfNonLiveVariables, 1866 ConjunctsInSsa, 207 ConjunctsInUnsatCore, 23 InterpolantComputations, 3 PerfectInterpolantSequences, 7013/11113 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...