/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_o1000.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:29:56,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:29:56,469 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:29:56,496 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:29:56,497 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:29:56,498 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:29:56,501 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:29:56,503 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:29:56,506 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:29:56,508 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:29:56,509 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:29:56,511 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:29:56,512 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:29:56,513 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:29:56,515 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:29:56,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:29:56,519 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:29:56,520 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:29:56,523 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:29:56,526 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:29:56,529 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:29:56,530 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:29:56,532 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:29:56,534 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:29:56,540 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:29:56,571 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 22:29:56,615 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:29:56,616 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:29:56,621 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:29:56,622 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:29:56,622 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:29:56,623 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:29:56,623 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:29:56,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:29:56,623 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:29:56,624 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:29:56,625 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:29:56,625 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:29:56,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:29:56,626 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:29:56,626 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:29:56,627 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:29:56,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:29:56,627 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:29:56,627 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:29:56,628 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:29:56,629 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:29:56,629 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:29:56,629 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:29:56,630 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:29:56,630 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:29:56,630 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:29:56,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:29:56,630 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:29:56,631 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:29:56,631 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 22:29:57,068 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:29:57,089 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:29:57,094 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:29:57,097 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:29:57,098 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:29:57,100 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-21 22:29:57,200 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514b32108/6b6a3124d9974205b2a103cd7f7133b9/FLAG89bed3224 [2020-07-21 22:29:57,862 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:29:57,863 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-21 22:29:57,872 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514b32108/6b6a3124d9974205b2a103cd7f7133b9/FLAG89bed3224 [2020-07-21 22:29:58,198 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514b32108/6b6a3124d9974205b2a103cd7f7133b9 [2020-07-21 22:29:58,212 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:29:58,216 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:29:58,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:29:58,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:29:58,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:29:58,228 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,233 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c7bccb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58, skipping insertion in model container [2020-07-21 22:29:58,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,244 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:29:58,263 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:29:58,553 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:29:58,567 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:29:58,598 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:29:58,626 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:29:58,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58 WrapperNode [2020-07-21 22:29:58,630 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:29:58,632 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:29:58,633 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:29:58,633 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:29:58,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,656 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,667 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,667 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,674 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,678 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,679 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (1/1) ... [2020-07-21 22:29:58,682 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:29:58,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:29:58,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:29:58,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:29:58,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (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 22:29:58,974 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:29:58,974 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:29:58,974 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 22:29:58,975 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:29:58,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 22:29:58,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:29:58,975 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 22:29:58,975 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:29:58,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:29:58,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:29:59,234 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:29:59,238 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:29:59,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:29:59 BoogieIcfgContainer [2020-07-21 22:29:59,246 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:29:59,249 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:29:59,251 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:29:59,256 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:29:59,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:29:58" (1/3) ... [2020-07-21 22:29:59,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26a0c077 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:29:59, skipping insertion in model container [2020-07-21 22:29:59,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:29:58" (2/3) ... [2020-07-21 22:29:59,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26a0c077 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:29:59, skipping insertion in model container [2020-07-21 22:29:59,261 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:29:59" (3/3) ... [2020-07-21 22:29:59,263 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o1000.c [2020-07-21 22:29:59,278 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:29:59,288 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:29:59,309 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:29:59,347 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:29:59,347 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:29:59,347 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:29:59,348 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:29:59,348 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:29:59,348 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:29:59,348 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:29:59,348 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:29:59,376 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 22:29:59,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:29:59,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:29:59,389 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:29:59,390 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:29:59,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:29:59,401 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 22:29:59,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:29:59,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169304854] [2020-07-21 22:29:59,416 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 22:29:59,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:29:59,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:29:59,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:29:59,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:29:59,640 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 22:29:59,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:29:59,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169304854] [2020-07-21 22:29:59,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:29:59,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:29:59,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655204563] [2020-07-21 22:29:59,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:29:59,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:29:59,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:29:59,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:29:59,687 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 22:29:59,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:29:59,810 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 22:29:59,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:29:59,814 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:29:59,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:29:59,862 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:29:59,863 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 22:29:59,878 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 22:29:59,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 22:29:59,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 22:29:59,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 22:29:59,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 22:29:59,943 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 22:29:59,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:29:59,944 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 22:29:59,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:29:59,945 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 22:29:59,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:29:59,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:29:59,949 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 22:30:00,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:00,165 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:00,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:00,166 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 22:30:00,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:00,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036220225] [2020-07-21 22:30:00,168 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 22:30:00,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:00,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:00,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:30:00,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:00,329 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 22:30:00,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:00,645 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 22:30:00,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036220225] [2020-07-21 22:30:00,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:00,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 22:30:00,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499782594] [2020-07-21 22:30:00,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:30:00,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:00,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:30:00,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:30:00,653 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 22:30:02,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:02,831 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 22:30:02,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:30:02,831 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 22:30:02,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:02,833 INFO L225 Difference]: With dead ends: 30 [2020-07-21 22:30:02,833 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:30:02,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:30:02,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:30:02,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:30:02,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:30:02,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 22:30:02,841 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 22:30:02,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:02,842 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 22:30:02,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:30:02,842 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 22:30:02,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:30:02,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:02,844 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 22:30:03,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:03,060 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:03,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:03,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 22:30:03,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:03,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521538512] [2020-07-21 22:30:03,063 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 22:30:03,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:03,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:03,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 22:30:03,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:03,280 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 22:30:03,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:08,286 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:30:08,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521538512] [2020-07-21 22:30:08,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:08,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 22:30:08,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696886205] [2020-07-21 22:30:08,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:30:08,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:08,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:30:08,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=314, Unknown=2, NotChecked=0, Total=380 [2020-07-21 22:30:08,291 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 22:30:11,130 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 22:30:13,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:13,376 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 22:30:13,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 22:30:13,377 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 22:30:13,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:13,379 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:30:13,380 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:30:13,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=98, Invalid=452, Unknown=2, NotChecked=0, Total=552 [2020-07-21 22:30:13,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:30:13,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 22:30:13,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:30:13,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 22:30:13,391 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 22:30:13,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:13,392 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 22:30:13,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:30:13,392 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 22:30:13,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:30:13,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:13,394 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 22:30:13,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:13,597 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:13,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:13,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 22:30:13,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:13,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131021577] [2020-07-21 22:30:13,600 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 22:30:13,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:13,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:13,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 22:30:13,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:14,004 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 22:30:14,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:30:22,244 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 76 refuted. 1 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:30:22,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131021577] [2020-07-21 22:30:22,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:30:22,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 22:30:22,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707154460] [2020-07-21 22:30:22,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 22:30:22,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:30:22,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 22:30:22,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1073, Unknown=3, NotChecked=0, Total=1260 [2020-07-21 22:30:22,250 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 22:30:23,070 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 22:30:30,137 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 22:30:37,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:37,527 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 22:30:37,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 22:30:37,529 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 22:30:37,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:37,532 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:30:37,532 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:30:37,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=382, Invalid=1869, Unknown=5, NotChecked=0, Total=2256 [2020-07-21 22:30:37,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:30:37,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 22:30:37,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 22:30:37,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 22:30:37,551 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 22:30:37,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:37,552 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 22:30:37,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 22:30:37,555 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 22:30:37,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 22:30:37,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:37,561 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 22:30:37,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:37,764 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:37,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:37,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 22:30:37,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:37,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900630445] [2020-07-21 22:30:37,767 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 22:30:41,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:30:41,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:30:41,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 22:30:41,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:30:42,676 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 22:30:42,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:31:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 338 refuted. 7 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:31:07,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900630445] [2020-07-21 22:31:07,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:31:07,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 22:31:07,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494926209] [2020-07-21 22:31:07,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 22:31:07,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:31:07,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 22:31:07,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3931, Unknown=9, NotChecked=0, Total=4556 [2020-07-21 22:31:07,885 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 22:31:13,854 WARN L193 SmtUtils]: Spent 1.21 s on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 22:31:18,722 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 22:31:23,793 WARN L193 SmtUtils]: Spent 1.63 s on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 22:31:32,070 WARN L193 SmtUtils]: Spent 4.79 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 22:31:36,018 WARN L193 SmtUtils]: Spent 785.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 22:31:43,750 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 22:31:56,779 WARN L193 SmtUtils]: Spent 715.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 22:32:05,115 WARN L193 SmtUtils]: Spent 969.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 22:32:12,972 WARN L193 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 22:32:16,056 WARN L193 SmtUtils]: Spent 437.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 22:32:21,976 WARN L193 SmtUtils]: Spent 2.45 s on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 22:32:24,202 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 22:32:30,515 WARN L193 SmtUtils]: Spent 2.38 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 22:32:37,992 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 22:32:39,757 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 22:32:50,055 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 22:32:53,239 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 22:33:00,404 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 22:33:03,755 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 22:33:09,978 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 22:33:39,795 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 22:33:39,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:33:39,818 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 22:33:39,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 22:33:39,819 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 22:33:39,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:33:39,823 INFO L225 Difference]: With dead ends: 114 [2020-07-21 22:33:39,823 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:33:39,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 173.9s TimeCoverageRelationStatistics Valid=1522, Invalid=7579, Unknown=19, NotChecked=0, Total=9120 [2020-07-21 22:33:39,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:33:39,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 22:33:39,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 22:33:39,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 22:33:39,841 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 22:33:39,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:33:39,841 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 22:33:39,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 22:33:39,842 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 22:33:39,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 22:33:39,845 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:33:39,846 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 22:33:40,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:33:40,053 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:33:40,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:33:40,054 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 22:33:40,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:33:40,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119235626] [2020-07-21 22:33:40,055 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 22:34:46,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:34:46,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:34:46,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 22:34:46,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:34:49,928 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 22:34:49,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:37:19,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1404 refuted. 53 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 22:37:19,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119235626] [2020-07-21 22:37:19,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:37:19,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 22:37:19,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436622514] [2020-07-21 22:37:19,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 22:37:19,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:37:19,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 22:37:19,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14988, Unknown=56, NotChecked=0, Total=17292 [2020-07-21 22:37:19,330 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 22:38:21,589 WARN L193 SmtUtils]: Spent 6.22 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 22:39:04,689 WARN L193 SmtUtils]: Spent 4.34 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 22:39:54,778 WARN L193 SmtUtils]: Spent 3.37 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 22:40:41,917 WARN L193 SmtUtils]: Spent 6.02 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 22:41:29,658 WARN L193 SmtUtils]: Spent 10.31 s on a formula simplification. DAG size of input: 148 DAG size of output: 18 [2020-07-21 22:42:23,288 WARN L193 SmtUtils]: Spent 5.17 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 22:43:06,286 WARN L193 SmtUtils]: Spent 7.33 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 22:43:53,217 WARN L193 SmtUtils]: Spent 4.32 s on a formula simplification. DAG size of input: 141 DAG size of output: 11