/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:50:03,296 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:50:03,299 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:50:03,313 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:50:03,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:50:03,315 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:50:03,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:50:03,318 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:50:03,320 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:50:03,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:50:03,322 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:50:03,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:50:03,324 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:50:03,325 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:50:03,326 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:50:03,328 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:50:03,329 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:50:03,330 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:50:03,332 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:50:03,334 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:50:03,336 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:50:03,338 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:50:03,339 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:50:03,341 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:50:03,344 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:50:03,357 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 [2020-07-21 00:50:03,373 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:50:03,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:50:03,375 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:50:03,375 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:50:03,376 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:50:03,376 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:50:03,376 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:50:03,376 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:50:03,376 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:50:03,377 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:50:03,377 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:50:03,377 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:50:03,377 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:50:03,377 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:50:03,378 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:50:03,378 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:50:03,378 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:50:03,378 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:50:03,379 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:50:03,379 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:50:03,379 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:50:03,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:50:03,379 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:50:03,380 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:50:03,380 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:50:03,380 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:50:03,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:03,380 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:50:03,381 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:50:03,381 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:50:03,685 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:50:03,701 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:50:03,705 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:50:03,707 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:50:03,707 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:50:03,708 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 00:50:03,804 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c806f6e8/4497c237e5c940969e377c77ff544b31/FLAGc247598c2 [2020-07-21 00:50:04,368 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:50:04,369 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 00:50:04,379 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c806f6e8/4497c237e5c940969e377c77ff544b31/FLAGc247598c2 [2020-07-21 00:50:04,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c806f6e8/4497c237e5c940969e377c77ff544b31 [2020-07-21 00:50:04,728 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:50:04,731 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:50:04,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:50:04,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:50:04,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:50:04,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:50:04" (1/1) ... [2020-07-21 00:50:04,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27edf361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:04, skipping insertion in model container [2020-07-21 00:50:04,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:50:04" (1/1) ... [2020-07-21 00:50:04,751 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:50:04,772 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:50:04,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:50:04,972 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:50:04,989 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:50:05,002 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:50:05,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05 WrapperNode [2020-07-21 00:50:05,002 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:50:05,003 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:50:05,003 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:50:05,004 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:50:05,015 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,016 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,021 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,026 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,029 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,030 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (1/1) ... [2020-07-21 00:50:05,032 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:50:05,033 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:50:05,033 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:50:05,033 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:50:05,034 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (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 [2020-07-21 00:50:05,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:50:05,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:50:05,206 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:50:05,206 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:50:05,206 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:50:05,206 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:50:05,206 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:50:05,207 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:50:05,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:50:05,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:50:05,401 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:50:05,401 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:50:05,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:50:05 BoogieIcfgContainer [2020-07-21 00:50:05,407 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:50:05,408 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:50:05,408 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:50:05,412 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:50:05,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:50:04" (1/3) ... [2020-07-21 00:50:05,414 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@694a7975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:50:05, skipping insertion in model container [2020-07-21 00:50:05,414 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:05" (2/3) ... [2020-07-21 00:50:05,415 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@694a7975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:50:05, skipping insertion in model container [2020-07-21 00:50:05,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:50:05" (3/3) ... [2020-07-21 00:50:05,418 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-21 00:50:05,431 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:50:05,442 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:50:05,472 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:50:05,557 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:50:05,558 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:50:05,562 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:50:05,562 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:50:05,563 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:50:05,563 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:50:05,563 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:50:05,565 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:50:05,609 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:50:05,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:50:05,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:05,618 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:05,618 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:05,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:05,625 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:50:05,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:05,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577250805] [2020-07-21 00:50:05,634 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 [2020-07-21 00:50:05,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:05,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:05,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:50:05,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:05,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:50:05,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:50:05,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577250805] [2020-07-21 00:50:05,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:50:05,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:50:05,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634641543] [2020-07-21 00:50:05,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:50:05,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:05,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:50:05,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:50:05,846 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:50:05,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:05,950 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:50:05,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:50:05,953 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:50:05,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:05,964 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:50:05,964 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:50:05,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:50:05,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:50:06,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:50:06,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:50:06,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:50:06,020 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:50:06,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:06,020 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:50:06,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:50:06,021 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:50:06,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:50:06,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:06,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:06,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:06,239 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:06,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:06,240 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:50:06,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:06,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23222684] [2020-07-21 00:50:06,242 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 [2020-07-21 00:50:06,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:50:06,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:06,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:50:06,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:06,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:50:06,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:50:06,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23222684] [2020-07-21 00:50:06,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:50:06,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:50:06,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140070536] [2020-07-21 00:50:06,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:50:06,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:06,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:50:06,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:50:06,316 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:50:06,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:06,401 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:50:06,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:50:06,402 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:50:06,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:06,404 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:50:06,404 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:50:06,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:50:06,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:50:06,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:50:06,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:50:06,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:50:06,414 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:50:06,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:06,415 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:50:06,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:50:06,415 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:50:06,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:50:06,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:06,417 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:06,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:06,631 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:06,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:06,633 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:50:06,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:06,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336921779] [2020-07-21 00:50:06,635 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 [2020-07-21 00:50:06,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:06,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:06,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:50:06,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:06,750 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:50:06,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:06,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:07,031 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:50:07,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336921779] [2020-07-21 00:50:07,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:07,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:50:07,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126243510] [2020-07-21 00:50:07,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:50:07,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:07,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:50:07,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:50:07,038 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:50:07,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:07,188 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:50:07,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:50:07,189 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:50:07,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:07,191 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:50:07,191 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:50:07,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:07,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:50:07,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:50:07,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:50:07,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:50:07,203 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:50:07,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:07,204 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:50:07,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:50:07,204 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:50:07,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:50:07,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:07,207 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] [2020-07-21 00:50:07,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:07,421 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:07,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:07,422 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:50:07,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:07,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436347644] [2020-07-21 00:50:07,423 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 [2020-07-21 00:50:07,462 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:07,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:07,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:50:07,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:07,508 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:50:07,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:07,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:07,704 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:50:07,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436347644] [2020-07-21 00:50:07,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:07,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:50:07,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081317286] [2020-07-21 00:50:07,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:50:07,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:07,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:50:07,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:50:07,708 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:50:07,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:07,793 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:50:07,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:50:07,794 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:50:07,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:07,797 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:50:07,797 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:50:07,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:07,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:50:07,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:50:07,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:50:07,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:50:07,808 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:50:07,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:07,808 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:50:07,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:50:07,809 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:50:07,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:50:07,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:07,811 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:08,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:08,026 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:08,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:08,027 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:50:08,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:08,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161350350] [2020-07-21 00:50:08,028 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 [2020-07-21 00:50:08,057 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:08,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:08,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:50:08,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 00:50:08,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:08,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:08,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:08,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:08,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:08,483 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:50:08,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161350350] [2020-07-21 00:50:08,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:08,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:50:08,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425490144] [2020-07-21 00:50:08,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:50:08,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:08,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:50:08,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:08,487 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:50:08,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:08,692 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:50:08,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:50:08,694 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:50:08,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:08,696 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:50:08,696 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:50:08,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:08,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:50:08,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:50:08,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:50:08,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:50:08,707 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:50:08,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:08,707 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:50:08,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:50:08,708 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:50:08,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:50:08,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:08,710 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:08,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:08,913 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:08,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:08,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:50:08,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:08,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216102125] [2020-07-21 00:50:08,916 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 [2020-07-21 00:50:08,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:08,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:08,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:50:08,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:09,027 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 00:50:09,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:09,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:09,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:09,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:09,362 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:50:09,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216102125] [2020-07-21 00:50:09,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:09,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:50:09,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586664397] [2020-07-21 00:50:09,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:50:09,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:09,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:50:09,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:09,365 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:50:09,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:09,506 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:50:09,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:50:09,507 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:50:09,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:09,510 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:50:09,510 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:50:09,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:09,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:50:09,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:50:09,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:50:09,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:50:09,522 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:50:09,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:09,523 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:50:09,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:50:09,524 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:50:09,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:50:09,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:09,526 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:09,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:09,734 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:09,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:09,735 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:50:09,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:09,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756192430] [2020-07-21 00:50:09,736 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 [2020-07-21 00:50:09,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:09,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:09,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:50:09,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:09,826 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 00:50:09,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:10,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:10,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:10,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:10,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:10,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:10,502 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 00:50:10,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756192430] [2020-07-21 00:50:10,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:10,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:50:10,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723013974] [2020-07-21 00:50:10,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:50:10,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:10,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:50:10,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:50:10,505 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:50:10,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:10,698 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:50:10,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:50:10,699 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:50:10,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:10,705 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:50:10,708 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:50:10,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:50:10,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:50:10,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:50:10,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:50:10,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:50:10,737 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:50:10,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:10,738 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:50:10,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:50:10,738 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:50:10,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:50:10,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:10,742 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:10,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:10,957 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:10,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:10,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:50:10,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:10,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141453105] [2020-07-21 00:50:10,960 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 [2020-07-21 00:50:11,002 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:50:11,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:11,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:50:11,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:11,093 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 00:50:11,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:11,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:11,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:11,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:11,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:11,777 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 00:50:11,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141453105] [2020-07-21 00:50:11,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:11,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 00:50:11,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697536553] [2020-07-21 00:50:11,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:50:11,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:11,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:50:11,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:50:11,784 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-21 00:50:11,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:11,920 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:50:11,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:50:11,923 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-21 00:50:11,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:11,926 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:50:11,926 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:50:11,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:50:11,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:50:11,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:50:11,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:50:11,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:50:11,941 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:50:11,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:11,942 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:50:11,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:50:11,942 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:50:11,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:50:11,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:11,945 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:12,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:12,161 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:12,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:12,162 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:50:12,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:12,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620702464] [2020-07-21 00:50:12,163 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 [2020-07-21 00:50:12,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:50:12,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:12,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:50:12,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:12,312 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 00:50:12,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:12,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:12,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:13,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:13,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:13,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:13,312 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:50:13,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620702464] [2020-07-21 00:50:13,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:13,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 00:50:13,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431904983] [2020-07-21 00:50:13,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:13,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:13,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:13,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:13,316 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-21 00:50:13,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:13,573 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:50:13,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:13,574 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-21 00:50:13,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:13,577 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:50:13,577 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:50:13,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:50:13,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:50:13,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:50:13,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:50:13,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:50:13,592 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:50:13,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:13,593 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:50:13,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:13,593 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:50:13,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:50:13,596 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:13,596 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:13,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:13,812 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:13,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:13,813 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:50:13,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:13,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081127461] [2020-07-21 00:50:13,814 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 [2020-07-21 00:50:13,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:13,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:13,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:50:13,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:13,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-21 00:50:13,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:14,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:14,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:14,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:15,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-21 00:50:15,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081127461] [2020-07-21 00:50:15,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:15,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 00:50:15,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471163866] [2020-07-21 00:50:15,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:15,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:15,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:15,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:15,196 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-21 00:50:15,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:15,417 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-21 00:50:15,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:15,417 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-21 00:50:15,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:15,420 INFO L225 Difference]: With dead ends: 88 [2020-07-21 00:50:15,420 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 00:50:15,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:50:15,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 00:50:15,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 00:50:15,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 00:50:15,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-21 00:50:15,437 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-21 00:50:15,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:15,438 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-21 00:50:15,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:15,438 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-21 00:50:15,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 00:50:15,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:15,443 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:15,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:15,657 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:15,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:15,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-21 00:50:15,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:15,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966941699] [2020-07-21 00:50:15,659 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 [2020-07-21 00:50:15,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:50:15,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:15,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:50:15,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:15,821 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 108 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-07-21 00:50:15,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:16,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:16,814 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-21 00:50:16,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966941699] [2020-07-21 00:50:16,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:16,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 00:50:16,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501490284] [2020-07-21 00:50:16,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:16,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:16,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:16,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:16,817 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-21 00:50:17,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:17,003 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-21 00:50:17,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:17,006 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-21 00:50:17,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:17,008 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:50:17,008 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 00:50:17,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:50:17,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 00:50:17,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-21 00:50:17,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 00:50:17,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-21 00:50:17,033 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-21 00:50:17,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:17,035 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-21 00:50:17,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:17,035 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-21 00:50:17,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 00:50:17,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:17,041 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:17,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:17,256 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:17,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:17,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-21 00:50:17,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:17,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823102555] [2020-07-21 00:50:17,258 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 [2020-07-21 00:50:17,364 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:50:17,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:17,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 00:50:17,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:17,544 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 00:50:17,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:18,430 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 00:50:18,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823102555] [2020-07-21 00:50:18,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:18,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-21 00:50:18,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58264992] [2020-07-21 00:50:18,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 00:50:18,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:18,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 00:50:18,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:50:18,434 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-21 00:50:18,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:18,732 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-21 00:50:18,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 00:50:18,732 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-21 00:50:18,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:18,737 INFO L225 Difference]: With dead ends: 112 [2020-07-21 00:50:18,737 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 00:50:18,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-21 00:50:18,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 00:50:18,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-21 00:50:18,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 00:50:18,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 00:50:18,763 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-21 00:50:18,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:18,764 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 00:50:18,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 00:50:18,764 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 00:50:18,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 00:50:18,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:18,769 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:18,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:18,984 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:18,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:18,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1883621107, now seen corresponding path program 7 times [2020-07-21 00:50:18,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:18,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879003472] [2020-07-21 00:50:18,985 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 [2020-07-21 00:50:19,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:50:19,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:19,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 00:50:19,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:19,132 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 184 proven. 46 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2020-07-21 00:50:19,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:19,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:19,612 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 182 proven. 55 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2020-07-21 00:50:19,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879003472] [2020-07-21 00:50:19,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:19,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 12 [2020-07-21 00:50:19,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385973562] [2020-07-21 00:50:19,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:50:19,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:19,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:50:19,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:50:19,615 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 12 states. [2020-07-21 00:50:19,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:19,738 INFO L93 Difference]: Finished difference Result 111 states and 196 transitions. [2020-07-21 00:50:19,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:50:19,739 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 121 [2020-07-21 00:50:19,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:19,742 INFO L225 Difference]: With dead ends: 111 [2020-07-21 00:50:19,743 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 00:50:19,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 224 SyntacticMatches, 7 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:50:19,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 00:50:19,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 81. [2020-07-21 00:50:19,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 00:50:19,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 00:50:19,796 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 121 [2020-07-21 00:50:19,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:19,800 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 00:50:19,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:50:19,800 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 00:50:19,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 00:50:19,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:19,806 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:20,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:20,020 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:20,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:20,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 8 times [2020-07-21 00:50:20,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:20,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730432207] [2020-07-21 00:50:20,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:20,109 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:50:20,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:20,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 00:50:20,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:20,217 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 00:50:20,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:20,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:20,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:20,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:20,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:20,957 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 00:50:20,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730432207] [2020-07-21 00:50:20,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:20,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 00:50:20,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654669165] [2020-07-21 00:50:20,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:20,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:20,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:20,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:20,960 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-21 00:50:21,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:21,143 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-21 00:50:21,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:21,144 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 00:50:21,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:21,146 INFO L225 Difference]: With dead ends: 97 [2020-07-21 00:50:21,147 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 00:50:21,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:50:21,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 00:50:21,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-21 00:50:21,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:50:21,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-21 00:50:21,160 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-21 00:50:21,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:21,161 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-21 00:50:21,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:21,161 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-21 00:50:21,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 00:50:21,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:21,164 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:21,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:21,380 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:21,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:21,381 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 9 times [2020-07-21 00:50:21,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:21,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188300669] [2020-07-21 00:50:21,383 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:21,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:21,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:21,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 00:50:21,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:21,554 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 00:50:21,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:22,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:22,433 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 00:50:22,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188300669] [2020-07-21 00:50:22,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:22,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 00:50:22,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161724974] [2020-07-21 00:50:22,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:22,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:22,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:22,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:22,437 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-21 00:50:22,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:22,619 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 00:50:22,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:22,620 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 00:50:22,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:22,622 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:50:22,622 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 00:50:22,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:50:22,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 00:50:22,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-21 00:50:22,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:50:22,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-21 00:50:22,634 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-21 00:50:22,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:22,634 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-21 00:50:22,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:22,635 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-21 00:50:22,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-21 00:50:22,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:22,637 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:22,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:22,851 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:22,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:22,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 10 times [2020-07-21 00:50:22,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:22,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1336239728] [2020-07-21 00:50:22,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:22,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:22,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:22,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:50:22,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:23,055 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 202 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2020-07-21 00:50:23,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:23,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:23,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:23,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:23,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:24,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:24,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:24,060 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-21 00:50:24,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1336239728] [2020-07-21 00:50:24,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:24,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 00:50:24,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180324497] [2020-07-21 00:50:24,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:24,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:24,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:24,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:24,071 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-21 00:50:24,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:24,244 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-21 00:50:24,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:24,245 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-21 00:50:24,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:24,246 INFO L225 Difference]: With dead ends: 109 [2020-07-21 00:50:24,247 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:50:24,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:50:24,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:50:24,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 00:50:24,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 00:50:24,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-21 00:50:24,258 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-21 00:50:24,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:24,259 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-21 00:50:24,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:24,259 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-21 00:50:24,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 00:50:24,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:24,262 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:24,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:24,475 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:24,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:24,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 11 times [2020-07-21 00:50:24,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:24,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223813972] [2020-07-21 00:50:24,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:24,561 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:24,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:24,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 00:50:24,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:24,622 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 00:50:24,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:25,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:25,452 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 00:50:25,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223813972] [2020-07-21 00:50:25,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:25,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 00:50:25,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329345921] [2020-07-21 00:50:25,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:50:25,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:25,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:50:25,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:25,466 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-21 00:50:25,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:25,630 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-21 00:50:25,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:50:25,630 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 00:50:25,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:25,632 INFO L225 Difference]: With dead ends: 75 [2020-07-21 00:50:25,633 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:50:25,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:50:25,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:50:25,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-21 00:50:25,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 00:50:25,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-21 00:50:25,648 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-21 00:50:25,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:25,649 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-21 00:50:25,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:50:25,650 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-21 00:50:25,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 00:50:25,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:25,653 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:25,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:25,868 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:25,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:25,869 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 12 times [2020-07-21 00:50:25,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:25,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933443457] [2020-07-21 00:50:25,870 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:25,970 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:50:25,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:25,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 00:50:25,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:26,066 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-21 00:50:26,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:26,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:26,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:26,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:27,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:27,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:27,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:27,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:27,240 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-21 00:50:27,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933443457] [2020-07-21 00:50:27,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:27,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 00:50:27,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104902791] [2020-07-21 00:50:27,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 00:50:27,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:27,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 00:50:27,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:50:27,243 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-21 00:50:27,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:27,448 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-21 00:50:27,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:50:27,449 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-21 00:50:27,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:27,449 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:50:27,450 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 00:50:27,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:50:27,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 00:50:27,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 00:50:27,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 00:50:27,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 00:50:27,453 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-21 00:50:27,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:27,472 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 00:50:27,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 00:50:27,472 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 00:50:27,472 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 00:50:27,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:27,676 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 00:50:28,071 WARN L193 SmtUtils]: Spent 348.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 38 [2020-07-21 00:50:28,281 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 35 [2020-07-21 00:50:28,484 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:28,659 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:28,802 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2020-07-21 00:50:29,137 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 72 [2020-07-21 00:50:29,297 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 43 [2020-07-21 00:50:29,434 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:29,572 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:29,756 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2020-07-21 00:50:29,930 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 55 [2020-07-21 00:50:30,187 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:30,304 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 00:50:30,412 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 43 [2020-07-21 00:50:31,781 WARN L193 SmtUtils]: Spent 571.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 30 [2020-07-21 00:50:31,804 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 00:50:31,804 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:50:31,804 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:50:31,804 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 00:50:31,805 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 00:50:31,805 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 00:50:31,805 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 00:50:31,805 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 00:50:31,805 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 00:50:31,805 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 00:50:31,806 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 00:50:31,806 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 00:50:31,806 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 00:50:31,806 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 00:50:31,806 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 00:50:31,806 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 00:50:31,807 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 00:50:31,807 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 00:50:31,807 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 00:50:31,807 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (and (let ((.cse0 (= |fibo_#t~ret0| 1)) (.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (or (and .cse0 .cse1 .cse2 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and (<= 5 |fibo_#in~n|) .cse1 .cse2) (and (<= 4 |fibo_#in~n|) .cse1 (= |fibo_#t~ret0| 2) .cse2) (and .cse0 .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)))) (or (<= |fibo_#in~n| 4) (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3))) [2020-07-21 00:50:31,808 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 00:50:31,808 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 00:50:31,808 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 00:50:31,808 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 00:50:31,815 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:50:31 BoogieIcfgContainer [2020-07-21 00:50:31,815 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:50:31,817 INFO L168 Benchmark]: Toolchain (without parser) took 27087.56 ms. Allocated memory was 136.8 MB in the beginning and 475.0 MB in the end (delta: 338.2 MB). Free memory was 101.4 MB in the beginning and 164.4 MB in the end (delta: -63.0 MB). Peak memory consumption was 330.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,817 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,818 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.95 ms. Allocated memory is still 136.8 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,818 INFO L168 Benchmark]: Boogie Preprocessor took 29.08 ms. Allocated memory is still 136.8 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,819 INFO L168 Benchmark]: RCFGBuilder took 373.92 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 90.4 MB in the beginning and 169.3 MB in the end (delta: -78.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,820 INFO L168 Benchmark]: TraceAbstraction took 26406.78 ms. Allocated memory was 201.3 MB in the beginning and 475.0 MB in the end (delta: 273.7 MB). Free memory was 168.6 MB in the beginning and 164.4 MB in the end (delta: 4.2 MB). Peak memory consumption was 332.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:31,822 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.95 ms. Allocated memory is still 136.8 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.08 ms. Allocated memory is still 136.8 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 373.92 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 90.4 MB in the beginning and 169.3 MB in the end (delta: -78.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26406.78 ms. Allocated memory was 201.3 MB in the beginning and 475.0 MB in the end (delta: 273.7 MB). Free memory was 168.6 MB in the beginning and 164.4 MB in the end (delta: 4.2 MB). Peak memory consumption was 332.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 22.1s, OverallIterations: 18, TraceHistogramMax: 27, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 398 SDtfs, 465 SDslu, 1701 SDs, 0 SdLazy, 1738 SolverSat, 449 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3202 GetRequests, 2825 SyntacticMatches, 130 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 18 MinimizatonAttempts, 158 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1722 NumberOfFragments, 89 HoareAnnotationTreeSize, 95 FomulaSimplifications, 1048005 FormulaSimplificationTreeSizeReduction, 3.5s HoareSimplificationTime, 8 FomulaSimplificationsInter, 2891 FormulaSimplificationTreeSizeReductionInter, 0.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 13.2s InterpolantComputationTime, 1588 NumberOfCodeBlocks, 910 NumberOfCodeBlocksAsserted, 40 NumberOfCheckSat, 3115 ConstructedInterpolants, 0 QuantifiedInterpolants, 656365 SizeOfPredicates, 77 NumberOfNonLiveVariables, 2035 ConjunctsInSsa, 222 ConjunctsInUnsatCore, 34 InterpolantComputations, 2 PerfectInterpolantSequences, 13692/18052 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...