/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:25:18,391 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:25:18,394 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:25:18,413 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:25:18,413 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:25:18,415 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:25:18,417 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:25:18,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:25:18,432 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:25:18,436 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:25:18,438 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:25:18,439 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:25:18,439 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:25:18,440 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:25:18,441 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:25:18,444 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:25:18,445 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:25:18,447 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:25:18,448 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:25:18,452 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:25:18,457 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:25:18,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:25:18,462 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:25:18,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:25:18,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:25:18,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:25:18,476 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:25:18,477 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:25:18,478 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 13:25:18,514 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:25:18,514 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:25:18,519 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:25:18,519 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:25:18,519 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:25:18,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:25:18,520 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:25:18,520 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:25:18,520 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:25:18,520 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:25:18,521 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:25:18,522 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:25:18,522 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:25:18,522 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:25:18,522 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:25:18,522 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:25:18,523 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:25:18,523 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:25:18,523 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:25:18,523 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:25:18,524 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:25:18,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:18,524 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:25:18,524 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:25:18,524 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:25:18,868 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:25:18,888 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:25:18,891 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:25:18,892 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:25:18,893 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:25:18,893 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 13:25:18,986 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dab035160/fae26d3385e04fb5aaca49ef5a7cea28/FLAG5f0e50b3e [2020-07-21 13:25:19,436 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:25:19,437 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 13:25:19,445 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dab035160/fae26d3385e04fb5aaca49ef5a7cea28/FLAG5f0e50b3e [2020-07-21 13:25:19,812 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dab035160/fae26d3385e04fb5aaca49ef5a7cea28 [2020-07-21 13:25:19,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:25:19,826 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:25:19,827 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:19,827 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:25:19,831 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:25:19,832 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:19" (1/1) ... [2020-07-21 13:25:19,835 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d363db0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:19, skipping insertion in model container [2020-07-21 13:25:19,835 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:19" (1/1) ... [2020-07-21 13:25:19,842 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:25:19,859 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:25:20,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:20,075 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:25:20,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:20,111 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:25:20,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20 WrapperNode [2020-07-21 13:25:20,112 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:20,113 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:25:20,113 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:25:20,113 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:25:20,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,132 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,132 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,135 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,137 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (1/1) ... [2020-07-21 13:25:20,139 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:25:20,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:25:20,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:25:20,139 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:25:20,140 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (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 13:25:20,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:25:20,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:25:20,281 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:25:20,281 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:25:20,281 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 13:25:20,282 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:25:20,282 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:25:20,282 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:25:20,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:25:20,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:25:20,436 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:25:20,437 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:25:20,440 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:20 BoogieIcfgContainer [2020-07-21 13:25:20,440 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:25:20,442 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:25:20,442 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:25:20,444 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:25:20,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:25:19" (1/3) ... [2020-07-21 13:25:20,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ae2770 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:20, skipping insertion in model container [2020-07-21 13:25:20,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:20" (2/3) ... [2020-07-21 13:25:20,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ae2770 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:20, skipping insertion in model container [2020-07-21 13:25:20,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:20" (3/3) ... [2020-07-21 13:25:20,447 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-21 13:25:20,456 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:25:20,462 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:25:20,476 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:25:20,502 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:25:20,502 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:25:20,502 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:25:20,503 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:25:20,503 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:25:20,503 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:25:20,503 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:25:20,503 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:25:20,523 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 13:25:20,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:25:20,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:20,532 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:20,532 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:20,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:20,539 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 13:25:20,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:20,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571818326] [2020-07-21 13:25:20,549 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:25:20,628 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:20,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:20,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:25:20,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:20,713 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 13:25:20,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:25:20,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571818326] [2020-07-21 13:25:20,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:25:20,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:25:20,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309601169] [2020-07-21 13:25:20,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:25:20,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:20,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:25:20,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:20,750 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 13:25:20,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:20,809 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 13:25:20,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:25:20,811 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:25:20,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:20,824 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:25:20,824 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 13:25:20,828 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 13:25:20,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 13:25:20,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 13:25:20,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 13:25:20,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 13:25:20,880 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 13:25:20,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:20,880 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 13:25:20,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:25:20,881 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 13:25:20,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:25:20,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:20,883 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 13:25:21,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:21,099 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:21,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:21,101 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 13:25:21,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:21,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961114885] [2020-07-21 13:25:21,103 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:25:21,138 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:21,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:21,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:25:21,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:21,209 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 13:25:21,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:21,392 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 13:25:21,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961114885] [2020-07-21 13:25:21,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:21,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 13:25:21,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955763304] [2020-07-21 13:25:21,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:25:21,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:21,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:25:21,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:21,398 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 13:25:21,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:21,490 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 13:25:21,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:21,491 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 13:25:21,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:21,493 INFO L225 Difference]: With dead ends: 30 [2020-07-21 13:25:21,493 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:25:21,494 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 13:25:21,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:25:21,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:25:21,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:25:21,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 13:25:21,502 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 13:25:21,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:21,503 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 13:25:21,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:25:21,503 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 13:25:21,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:25:21,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:21,505 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 13:25:21,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:21,718 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:21,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:21,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 13:25:21,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:21,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588030478] [2020-07-21 13:25:21,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:25:21,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:21,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:21,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:25:21,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:21,879 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 13:25:21,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:22,285 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 13:25:22,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588030478] [2020-07-21 13:25:22,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:22,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 13:25:22,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773178778] [2020-07-21 13:25:22,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:25:22,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:22,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:25:22,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:25:22,289 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 13:25:24,565 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 13:25:24,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:24,712 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 13:25:24,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 13:25:24,713 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 13:25:24,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:24,715 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:25:24,715 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 13:25:24,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:24,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 13:25:24,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 13:25:24,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:25:24,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 13:25:24,725 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 13:25:24,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:24,725 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 13:25:24,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:25:24,726 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 13:25:24,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 13:25:24,728 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:24,728 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 13:25:24,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:24,942 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:24,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:24,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 13:25:24,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:24,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156844757] [2020-07-21 13:25:24,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:25:24,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:24,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:24,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 13:25:24,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:25,275 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 13:25:25,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:26,833 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 13:25:26,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156844757] [2020-07-21 13:25:26,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:26,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 13:25:26,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376894058] [2020-07-21 13:25:26,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 13:25:26,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:26,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 13:25:26,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1076, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:25:26,837 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 13:25:29,588 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:25:32,318 WARN L193 SmtUtils]: Spent 2.31 s on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:25:32,749 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:25:33,120 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 13:25:34,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:34,328 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 13:25:34,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 13:25:34,331 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 13:25:34,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:34,333 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:25:34,333 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:25:34,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=382, Invalid=1874, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 13:25:34,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:25:34,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 13:25:34,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:25:34,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 13:25:34,351 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 13:25:34,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:34,352 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 13:25:34,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 13:25:34,352 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 13:25:34,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 13:25:34,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:34,356 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 13:25:34,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:34,559 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:34,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:34,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 13:25:34,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:34,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776614355] [2020-07-21 13:25:34,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:25:34,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:34,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:34,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 13:25:34,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:35,347 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 13:25:35,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:26:05,561 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 13:26:05,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776614355] [2020-07-21 13:26:05,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:26:05,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 13:26:05,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769306598] [2020-07-21 13:26:05,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 13:26:05,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:26:05,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 13:26:05,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3928, Unknown=12, NotChecked=0, Total=4556 [2020-07-21 13:26:05,567 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 13:26:10,218 WARN L193 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 13:26:15,290 WARN L193 SmtUtils]: Spent 560.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 13:26:19,251 WARN L193 SmtUtils]: Spent 520.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 13:26:29,428 WARN L193 SmtUtils]: Spent 4.93 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 13:26:32,542 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 13:26:37,865 WARN L193 SmtUtils]: Spent 2.34 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 13:26:43,175 WARN L193 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 13:26:48,694 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 13:26:51,368 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 13:26:54,248 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 13:26:56,489 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 13:27:01,414 WARN L193 SmtUtils]: Spent 685.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 13:27:07,246 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 13:27:17,918 WARN L193 SmtUtils]: Spent 2.39 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 13:27:23,951 WARN L193 SmtUtils]: Spent 4.28 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 13:27:31,713 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 13:27:46,675 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 13:27:52,498 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 13:28:02,646 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 13:28:13,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:28:13,605 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 13:28:13,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 13:28:13,607 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 13:28:13,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:28:13,611 INFO L225 Difference]: With dead ends: 114 [2020-07-21 13:28:13,611 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:28:13,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 155.6s TimeCoverageRelationStatistics Valid=1522, Invalid=7579, Unknown=19, NotChecked=0, Total=9120 [2020-07-21 13:28:13,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:28:13,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 13:28:13,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 13:28:13,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 13:28:13,631 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 13:28:13,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:28:13,632 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 13:28:13,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 13:28:13,632 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 13:28:13,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 13:28:13,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:28:13,636 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 13:28:13,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:28:13,841 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:28:13,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:28:13,842 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 13:28:13,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:28:13,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359251648] [2020-07-21 13:28:13,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 13:28:13,944 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:28:13,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:28:13,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 13:28:13,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:28:17,077 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 13:28:17,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:30:24,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1416 refuted. 41 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 13:30:24,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359251648] [2020-07-21 13:30:24,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:30:24,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 13:30:24,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220266104] [2020-07-21 13:30:24,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 13:30:24,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:30:24,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 13:30:24,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14997, Unknown=47, NotChecked=0, Total=17292 [2020-07-21 13:30:24,405 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 13:31:25,050 WARN L193 SmtUtils]: Spent 4.08 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 13:32:21,858 WARN L193 SmtUtils]: Spent 4.25 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 13:33:22,989 WARN L193 SmtUtils]: Spent 5.92 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 13:34:20,992 WARN L193 SmtUtils]: Spent 4.73 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 13:35:26,728 WARN L193 SmtUtils]: Spent 13.23 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 13:36:24,912 WARN L193 SmtUtils]: Spent 4.40 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 13:37:16,566 WARN L193 SmtUtils]: Spent 4.22 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 13:38:09,308 WARN L193 SmtUtils]: Spent 4.61 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-21 13:39:04,041 WARN L193 SmtUtils]: Spent 7.30 s on a formula simplification. DAG size of input: 138 DAG size of output: 13 [2020-07-21 13:40:00,091 WARN L193 SmtUtils]: Spent 5.44 s on a formula simplification. DAG size of input: 136 DAG size of output: 11