/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/id_o200.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:30:23,499 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:30:23,503 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:30:23,536 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:30:23,536 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:30:23,541 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:30:23,544 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:30:23,552 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:30:23,557 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:30:23,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:30:23,567 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:30:23,570 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:30:23,570 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:30:23,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:30:23,574 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:30:23,576 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:30:23,577 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:30:23,579 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:30:23,581 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:30:23,584 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:30:23,587 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:30:23,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:30:23,591 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:30:23,592 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:30:23,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:30:23,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:30:23,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:30:23,611 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:30:23,612 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 22:30:23,640 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:30:23,641 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:30:23,645 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:30:23,646 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:30:23,646 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:30:23,647 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:30:23,647 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:30:23,647 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:30:23,647 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:30:23,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:30:23,649 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:30:23,650 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:30:23,650 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:30:23,651 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:30:23,652 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:30:23,652 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:30:23,652 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:30:23,652 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:30:23,653 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:30:23,653 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:30:23,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:30:23,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:30:23,655 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:30:23,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:30:23,655 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:30:23,655 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:30:23,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:23,656 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:30:23,656 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:30:23,656 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 22:30:24,110 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:30:24,150 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:30:24,158 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:30:24,160 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:30:24,164 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:30:24,165 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-21 22:30:24,285 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9dde2949/402f5110dd554b19ace2c9ba72ea1453/FLAGe500d037d [2020-07-21 22:30:25,009 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:30:25,012 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-21 22:30:25,024 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9dde2949/402f5110dd554b19ace2c9ba72ea1453/FLAGe500d037d [2020-07-21 22:30:25,278 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9dde2949/402f5110dd554b19ace2c9ba72ea1453 [2020-07-21 22:30:25,290 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:30:25,294 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:30:25,295 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:30:25,295 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:30:25,299 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:30:25,300 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,303 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b45841e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25, skipping insertion in model container [2020-07-21 22:30:25,303 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,311 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:30:25,335 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:30:25,485 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:30:25,490 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:30:25,506 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:30:25,519 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:30:25,520 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25 WrapperNode [2020-07-21 22:30:25,520 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:30:25,521 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:30:25,521 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:30:25,521 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:30:25,532 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,533 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,537 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,538 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,543 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (1/1) ... [2020-07-21 22:30:25,546 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:30:25,546 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:30:25,546 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:30:25,546 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:30:25,547 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (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 22:30:25,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:30:25,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:30:25,704 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 22:30:25,705 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:30:25,705 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 22:30:25,705 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:30:25,705 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 22:30:25,706 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:30:25,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:30:25,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:30:25,859 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:30:25,859 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:30:25,863 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:30:25 BoogieIcfgContainer [2020-07-21 22:30:25,863 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:30:25,864 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:30:25,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:30:25,868 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:30:25,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:30:25" (1/3) ... [2020-07-21 22:30:25,868 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3563e40a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:30:25, skipping insertion in model container [2020-07-21 22:30:25,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:30:25" (2/3) ... [2020-07-21 22:30:25,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3563e40a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:30:25, skipping insertion in model container [2020-07-21 22:30:25,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:30:25" (3/3) ... [2020-07-21 22:30:25,870 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o200.c [2020-07-21 22:30:25,879 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:30:25,886 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:30:25,902 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:30:25,928 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:30:25,929 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:30:25,929 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:30:25,929 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:30:25,929 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:30:25,930 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:30:25,930 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:30:25,930 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:30:25,947 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 22:30:25,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:30:25,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:25,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:25,956 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:25,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:25,963 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 22:30:25,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:25,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642833227] [2020-07-21 22:30:25,974 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 22:30:26,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:30:26,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:26,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:30:26,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:26,223 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 22:30:26,224 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:30:26,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642833227] [2020-07-21 22:30:26,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:30:26,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:30:26,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322596997] [2020-07-21 22:30:26,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:30:26,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:26,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:30:26,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:30:26,249 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 22:30:26,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:26,301 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 22:30:26,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:30:26,304 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:30:26,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:26,315 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:30:26,315 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 22:30:26,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:30:26,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 22:30:26,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 22:30:26,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 22:30:26,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 22:30:26,367 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 22:30:26,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:26,368 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 22:30:26,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:30:26,368 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 22:30:26,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:30:26,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:26,371 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:26,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:26,585 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:26,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:26,587 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 22:30:26,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:26,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334869423] [2020-07-21 22:30:26,588 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 22:30:26,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:26,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:26,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:30:26,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:26,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:30:26,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:27,006 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:30:27,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334869423] [2020-07-21 22:30:27,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:27,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 22:30:27,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057281826] [2020-07-21 22:30:27,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:30:27,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:27,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:30:27,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:30:27,012 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 22:30:27,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:27,104 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 22:30:27,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:30:27,106 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 22:30:27,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:27,108 INFO L225 Difference]: With dead ends: 30 [2020-07-21 22:30:27,108 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:30:27,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:30:27,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:30:27,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:30:27,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:30:27,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 22:30:27,122 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 22:30:27,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:27,123 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 22:30:27,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:30:27,123 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 22:30:27,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:30:27,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:27,126 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:27,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:27,341 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:27,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:27,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 22:30:27,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:27,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6217361] [2020-07-21 22:30:27,344 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 22:30:27,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:27,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:27,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 22:30:27,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:27,628 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:30:27,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:28,262 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:30:28,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6217361] [2020-07-21 22:30:28,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:28,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 22:30:28,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722447037] [2020-07-21 22:30:28,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:30:28,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:28,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:30:28,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:30:28,268 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 22:30:30,747 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 22:30:33,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:33,071 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 22:30:33,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 22:30:33,072 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 22:30:33,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:33,074 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:30:33,074 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:30:33,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 22:30:33,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:30:33,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 22:30:33,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:30:33,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 22:30:33,088 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 22:30:33,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:33,088 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 22:30:33,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:30:33,089 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 22:30:33,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:30:33,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:33,091 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:33,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:33,301 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:33,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:33,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 22:30:33,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:33,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439657160] [2020-07-21 22:30:33,304 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 22:30:33,387 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:33,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:33,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 22:30:33,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:33,748 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:30:33,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:35,918 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:30:35,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439657160] [2020-07-21 22:30:35,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:35,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 22:30:35,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179559235] [2020-07-21 22:30:35,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 22:30:35,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:35,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 22:30:35,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1076, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 22:30:35,924 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 22:30:37,353 WARN L193 SmtUtils]: Spent 733.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 22:30:39,952 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 22:30:43,028 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 22:30:45,765 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 22:30:50,355 WARN L193 SmtUtils]: Spent 4.21 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-21 22:30:53,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:53,310 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 22:30:53,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 22:30:53,314 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 22:30:53,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:53,317 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:30:53,317 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:30:53,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=381, Invalid=1874, Unknown=1, NotChecked=0, Total=2256 [2020-07-21 22:30:53,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:30:53,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 22:30:53,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 22:30:53,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 22:30:53,335 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 22:30:53,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:53,336 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 22:30:53,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 22:30:53,336 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 22:30:53,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 22:30:53,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:53,341 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:53,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:53,543 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:53,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:53,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 22:30:53,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:53,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970007080] [2020-07-21 22:30:53,546 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 22:30:57,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:57,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:57,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 22:30:57,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:58,323 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:30:58,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:25,680 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 332 refuted. 13 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:31:25,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970007080] [2020-07-21 22:31:25,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:25,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 22:31:25,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273912586] [2020-07-21 22:31:25,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 22:31:25,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:25,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 22:31:25,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3930, Unknown=10, NotChecked=0, Total=4556 [2020-07-21 22:31:25,692 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 22:31:30,384 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 22:31:36,925 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 22:31:43,951 WARN L193 SmtUtils]: Spent 2.71 s on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 22:31:50,511 WARN L193 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 22:31:58,191 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 22:32:04,320 WARN L193 SmtUtils]: Spent 472.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 22:32:08,380 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 22:32:12,195 WARN L193 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 22:32:16,536 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 22:32:27,338 WARN L193 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 22:32:32,874 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 22:32:37,322 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 22:32:41,568 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 22:32:46,118 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 22:32:52,118 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 22:33:00,443 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 22:33:08,039 WARN L193 SmtUtils]: Spent 4.27 s on a formula simplification. DAG size of input: 38 DAG size of output: 18 [2020-07-21 22:33:12,489 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 22:33:17,717 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 22:33:24,738 WARN L193 SmtUtils]: Spent 515.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 22:33:38,958 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 22:33:59,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:33:59,153 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 22:33:59,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 22:33:59,155 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 22:33:59,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:33:59,160 INFO L225 Difference]: With dead ends: 114 [2020-07-21 22:33:59,160 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:33:59,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 175.7s TimeCoverageRelationStatistics Valid=1525, Invalid=7576, Unknown=19, NotChecked=0, Total=9120 [2020-07-21 22:33:59,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:33:59,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 22:33:59,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 22:33:59,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 22:33:59,181 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 22:33:59,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:33:59,182 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 22:33:59,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 22:33:59,182 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 22:33:59,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 22:33:59,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:33:59,192 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:33:59,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:33:59,396 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:33:59,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:33:59,397 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 22:33:59,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:33:59,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196234154] [2020-07-21 22:33:59,399 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 22:35:03,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:03,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:03,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 22:35:03,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 22:35:06,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:36:59,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1403 refuted. 54 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 22:36:59,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196234154] [2020-07-21 22:36:59,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:36:59,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 22:36:59,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866236942] [2020-07-21 22:36:59,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 22:36:59,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:36:59,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 22:36:59,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=15001, Unknown=43, NotChecked=0, Total=17292 [2020-07-21 22:36:59,534 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 22:37:51,017 WARN L193 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 22:38:45,864 WARN L193 SmtUtils]: Spent 9.11 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 22:39:38,377 WARN L193 SmtUtils]: Spent 4.93 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 22:40:32,024 WARN L193 SmtUtils]: Spent 5.01 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 22:41:18,656 WARN L193 SmtUtils]: Spent 3.14 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 22:42:04,914 WARN L193 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 22:42:49,152 WARN L193 SmtUtils]: Spent 4.31 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 22:43:35,912 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-21 22:44:20,249 WARN L193 SmtUtils]: Spent 6.02 s on a formula simplification. DAG size of input: 138 DAG size of output: 13