/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:32:57,560 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:32:57,563 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:32:57,582 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:32:57,582 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:32:57,584 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:32:57,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:32:57,600 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:32:57,602 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:32:57,604 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:32:57,606 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:32:57,607 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:32:57,607 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:32:57,610 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:32:57,612 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:32:57,613 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:32:57,617 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:32:57,618 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:32:57,621 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:32:57,625 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:32:57,629 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:32:57,633 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:32:57,634 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:32:57,636 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:32:57,639 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:32:57,651 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:32:57,651 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:32:57,653 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:32:57,654 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 20:32:57,674 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:32:57,675 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:32:57,676 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:32:57,676 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:32:57,676 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:32:57,677 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:32:57,677 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:32:57,677 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:32:57,677 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:32:57,677 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:32:57,678 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:32:57,678 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:32:57,678 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:32:57,678 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:32:57,678 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:32:57,679 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:32:57,679 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:32:57,679 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:32:57,679 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:32:57,679 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:32:57,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:32:57,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:32:57,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:32:57,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:32:57,680 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:32:57,681 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:32:57,681 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:57,681 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:32:57,681 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:32:57,681 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:32:57,968 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:32:57,988 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:32:57,991 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:32:57,993 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:32:57,994 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:32:57,994 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 20:32:58,067 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bff6764c4/6152870669b7404ebcebbe446d77b9d8/FLAGc733ccec6 [2020-07-21 20:32:58,524 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:32:58,525 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 20:32:58,533 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bff6764c4/6152870669b7404ebcebbe446d77b9d8/FLAGc733ccec6 [2020-07-21 20:32:58,898 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bff6764c4/6152870669b7404ebcebbe446d77b9d8 [2020-07-21 20:32:58,908 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:32:58,910 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:32:58,911 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:32:58,911 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:32:58,915 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:32:58,916 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:32:58" (1/1) ... [2020-07-21 20:32:58,919 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c2d0056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:58, skipping insertion in model container [2020-07-21 20:32:58,919 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:32:58" (1/1) ... [2020-07-21 20:32:58,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:32:58,940 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:32:59,116 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:32:59,122 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:32:59,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:32:59,157 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:32:59,158 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59 WrapperNode [2020-07-21 20:32:59,158 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:32:59,159 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:32:59,159 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:32:59,159 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:32:59,173 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,179 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,180 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,183 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,191 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (1/1) ... [2020-07-21 20:32:59,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:32:59,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:32:59,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:32:59,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:32:59,196 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (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 20:32:59,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:32:59,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:32:59,344 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:32:59,344 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:32:59,344 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:32:59,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:32:59,344 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:32:59,344 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:32:59,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:32:59,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:32:59,345 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:32:59,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:32:59,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:32:59,579 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:32:59,580 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 20:32:59,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:32:59 BoogieIcfgContainer [2020-07-21 20:32:59,586 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:32:59,588 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:32:59,588 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:32:59,591 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:32:59,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:32:58" (1/3) ... [2020-07-21 20:32:59,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41bce0e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:32:59, skipping insertion in model container [2020-07-21 20:32:59,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:32:59" (2/3) ... [2020-07-21 20:32:59,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41bce0e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:32:59, skipping insertion in model container [2020-07-21 20:32:59,593 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:32:59" (3/3) ... [2020-07-21 20:32:59,595 INFO L109 eAbstractionObserver]: Analyzing ICFG nested6.i [2020-07-21 20:32:59,612 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:32:59,622 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:32:59,637 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:32:59,667 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:32:59,667 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:32:59,667 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:32:59,668 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:32:59,668 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:32:59,668 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:32:59,668 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:32:59,668 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:32:59,689 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 20:32:59,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 20:32:59,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:59,696 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:59,697 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:59,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:59,704 INFO L82 PathProgramCache]: Analyzing trace with hash 404168940, now seen corresponding path program 1 times [2020-07-21 20:32:59,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:59,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673403624] [2020-07-21 20:32:59,714 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 20:32:59,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:59,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:59,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:32:59,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:59,873 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:32:59,900 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 20:32:59,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:32:59,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673403624] [2020-07-21 20:32:59,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:32:59,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:32:59,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316678661] [2020-07-21 20:32:59,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:32:59,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:32:59,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:32:59,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:32:59,927 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 5 states. [2020-07-21 20:33:00,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:00,053 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2020-07-21 20:33:00,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:33:00,055 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 20:33:00,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:00,065 INFO L225 Difference]: With dead ends: 57 [2020-07-21 20:33:00,065 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 20:33:00,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:33:00,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 20:33:00,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 20:33:00,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 20:33:00,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-21 20:33:00,113 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-07-21 20:33:00,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:00,114 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-21 20:33:00,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:33:00,114 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-21 20:33:00,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 20:33:00,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:00,116 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:00,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:00,317 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:00,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:00,318 INFO L82 PathProgramCache]: Analyzing trace with hash -849304486, now seen corresponding path program 1 times [2020-07-21 20:33:00,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:00,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584969938] [2020-07-21 20:33:00,321 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 20:33:00,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:33:00,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:00,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:33:00,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:00,399 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:33:00,420 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 20:33:00,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:33:00,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584969938] [2020-07-21 20:33:00,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:33:00,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 20:33:00,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334221578] [2020-07-21 20:33:00,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:33:00,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:00,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:33:00,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:33:00,425 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-07-21 20:33:00,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:00,554 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2020-07-21 20:33:00,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:33:00,555 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 20:33:00,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:00,556 INFO L225 Difference]: With dead ends: 40 [2020-07-21 20:33:00,556 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 20:33:00,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:33:00,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 20:33:00,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-07-21 20:33:00,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 20:33:00,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 20:33:00,567 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 16 [2020-07-21 20:33:00,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:00,568 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 20:33:00,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:33:00,568 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 20:33:00,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 20:33:00,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:00,569 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:00,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:00,783 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:00,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:00,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1573212483, now seen corresponding path program 1 times [2020-07-21 20:33:00,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:00,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836999645] [2020-07-21 20:33:00,785 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 20:33:00,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:33:00,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:00,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:33:00,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:00,851 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:33:00,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:33:00,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:33:00,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836999645] [2020-07-21 20:33:00,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:33:00,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:33:00,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613928044] [2020-07-21 20:33:00,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:33:00,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:00,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:33:00,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:33:00,874 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 5 states. [2020-07-21 20:33:00,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:00,944 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-07-21 20:33:00,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:33:00,945 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 20:33:00,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:00,946 INFO L225 Difference]: With dead ends: 45 [2020-07-21 20:33:00,946 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 20:33:00,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:33:00,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 20:33:00,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-21 20:33:00,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 20:33:00,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2020-07-21 20:33:00,958 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 20 [2020-07-21 20:33:00,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:00,958 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2020-07-21 20:33:00,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:33:00,959 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2020-07-21 20:33:00,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 20:33:00,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:00,960 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:01,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:01,175 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:01,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:01,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1604756500, now seen corresponding path program 1 times [2020-07-21 20:33:01,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:01,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171975055] [2020-07-21 20:33:01,177 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 20:33:01,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:33:01,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:01,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 20:33:01,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:01,246 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:33:01,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:33:01,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171975055] [2020-07-21 20:33:01,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:33:01,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 20:33:01,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219081550] [2020-07-21 20:33:01,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 20:33:01,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:01,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 20:33:01,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 20:33:01,251 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 4 states. [2020-07-21 20:33:01,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:01,315 INFO L93 Difference]: Finished difference Result 68 states and 78 transitions. [2020-07-21 20:33:01,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 20:33:01,315 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-07-21 20:33:01,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:01,316 INFO L225 Difference]: With dead ends: 68 [2020-07-21 20:33:01,317 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 20:33:01,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:33:01,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 20:33:01,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 20:33:01,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 20:33:01,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2020-07-21 20:33:01,330 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 24 [2020-07-21 20:33:01,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:01,330 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2020-07-21 20:33:01,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 20:33:01,331 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2020-07-21 20:33:01,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 20:33:01,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:01,332 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:01,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:01,533 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:01,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:01,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1598241856, now seen corresponding path program 1 times [2020-07-21 20:33:01,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:01,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276748467] [2020-07-21 20:33:01,535 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 20:33:01,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:33:01,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:01,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:33:01,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:01,603 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:33:01,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:01,659 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:33:01,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276748467] [2020-07-21 20:33:01,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:01,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-07-21 20:33:01,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427243758] [2020-07-21 20:33:01,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:33:01,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:01,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:33:01,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:33:01,662 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand 6 states. [2020-07-21 20:33:01,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:01,736 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2020-07-21 20:33:01,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 20:33:01,737 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-21 20:33:01,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:01,738 INFO L225 Difference]: With dead ends: 79 [2020-07-21 20:33:01,738 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 20:33:01,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:33:01,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 20:33:01,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2020-07-21 20:33:01,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 20:33:01,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-07-21 20:33:01,749 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 31 [2020-07-21 20:33:01,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:01,750 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-07-21 20:33:01,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:33:01,750 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-07-21 20:33:01,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 20:33:01,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:01,752 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:01,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:01,967 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:01,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:01,968 INFO L82 PathProgramCache]: Analyzing trace with hash 2099424040, now seen corresponding path program 1 times [2020-07-21 20:33:01,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:01,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722614283] [2020-07-21 20:33:01,969 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 20:33:02,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:33:02,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:02,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 20:33:02,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:02,087 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:33:02,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:04,603 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 20:33:04,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722614283] [2020-07-21 20:33:04,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:04,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-21 20:33:04,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599003815] [2020-07-21 20:33:04,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 20:33:04,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:04,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 20:33:04,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-07-21 20:33:04,612 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 13 states. [2020-07-21 20:33:37,035 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 20:34:14,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:14,642 INFO L93 Difference]: Finished difference Result 172 states and 229 transitions. [2020-07-21 20:34:14,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 20:34:14,650 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-21 20:34:14,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:14,653 INFO L225 Difference]: With dead ends: 172 [2020-07-21 20:34:14,653 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 20:34:14,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=308, Invalid=874, Unknown=8, NotChecked=0, Total=1190 [2020-07-21 20:34:14,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 20:34:14,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 89. [2020-07-21 20:34:14,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 20:34:14,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 117 transitions. [2020-07-21 20:34:14,676 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 117 transitions. Word has length 34 [2020-07-21 20:34:14,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:14,676 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 117 transitions. [2020-07-21 20:34:14,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 20:34:14,676 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 117 transitions. [2020-07-21 20:34:14,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 20:34:14,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:34:14,678 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:34:14,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:14,886 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:34:14,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:34:14,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1702845076, now seen corresponding path program 2 times [2020-07-21 20:34:14,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:34:14,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869124962] [2020-07-21 20:34:14,888 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:14,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:34:14,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:34:14,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 20:34:14,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:34:15,032 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:34:15,095 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:34:15,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:34:15,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:34:15,300 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:34:15,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869124962] [2020-07-21 20:34:15,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:34:15,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-07-21 20:34:15,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140007185] [2020-07-21 20:34:15,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:34:15,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:34:15,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:34:15,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:34:15,303 INFO L87 Difference]: Start difference. First operand 89 states and 117 transitions. Second operand 8 states. [2020-07-21 20:34:16,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:16,149 INFO L93 Difference]: Finished difference Result 148 states and 204 transitions. [2020-07-21 20:34:16,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 20:34:16,156 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2020-07-21 20:34:16,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:16,161 INFO L225 Difference]: With dead ends: 148 [2020-07-21 20:34:16,161 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 20:34:16,162 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:34:16,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 20:34:16,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 120. [2020-07-21 20:34:16,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 20:34:16,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 163 transitions. [2020-07-21 20:34:16,224 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 163 transitions. Word has length 38 [2020-07-21 20:34:16,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:16,226 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 163 transitions. [2020-07-21 20:34:16,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:34:16,226 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 163 transitions. [2020-07-21 20:34:16,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 20:34:16,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:34:16,231 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:34:16,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:16,432 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:34:16,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:34:16,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1662503488, now seen corresponding path program 3 times [2020-07-21 20:34:16,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:34:16,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031047643] [2020-07-21 20:34:16,434 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:16,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:34:16,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:34:16,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:34:16,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:34:16,503 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:34:16,552 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 20:34:16,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:34:16,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031047643] [2020-07-21 20:34:16,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:34:16,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 20:34:16,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461860686] [2020-07-21 20:34:16,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:34:16,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:34:16,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:34:16,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:34:16,555 INFO L87 Difference]: Start difference. First operand 120 states and 163 transitions. Second operand 6 states. [2020-07-21 20:34:16,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:16,825 INFO L93 Difference]: Finished difference Result 120 states and 163 transitions. [2020-07-21 20:34:16,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:34:16,832 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-21 20:34:16,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:16,832 INFO L225 Difference]: With dead ends: 120 [2020-07-21 20:34:16,832 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 20:34:16,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:34:16,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 20:34:16,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 20:34:16,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 20:34:16,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 20:34:16,839 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 45 [2020-07-21 20:34:16,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:16,839 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 20:34:16,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:34:16,840 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 20:34:16,840 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 20:34:17,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:17,058 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 20:34:17,590 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 11 [2020-07-21 20:34:17,786 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 12 [2020-07-21 20:34:18,097 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2020-07-21 20:34:18,276 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 12 [2020-07-21 20:34:18,524 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 20:34:29,545 WARN L193 SmtUtils]: Spent 11.02 s on a formula simplification. DAG size of input: 48 DAG size of output: 30 [2020-07-21 20:34:29,551 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 20:34:29,551 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 20:34:29,551 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 20:34:29,551 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 20:34:29,551 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 20:34:29,551 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 20:34:29,551 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L268 CegarLoopResult]: For program point L31(lines 23 33) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 37) no Hoare annotation was computed. [2020-07-21 20:34:29,552 INFO L264 CegarLoopResult]: At program point L23-2(lines 23 33) the Hoare annotation is: (let ((.cse2 (* 2 main_~i~0))) (let ((.cse0 (<= main_~n~0 main_~k~0)) (.cse1 (<= .cse2 main_~j~0))) (or (and (<= main_~k~0 main_~n~0) .cse0 .cse1) (and (forall ((main_~n~0 Int)) (or (< main_~k~0 main_~n~0) (< (div (* main_~n~0 (- 1)) (- 2)) (+ main_~i~0 2)))) (<= main_~k~0 main_~j~0) .cse0 .cse1) (and (<= (+ (div (+ (* main_~n~0 (- 1)) 1) (- 2)) 1) (div main_~j~0 2)) (<= main_~j~0 .cse2) .cse0 .cse1)))) [2020-07-21 20:34:29,553 INFO L268 CegarLoopResult]: For program point L24(lines 24 32) no Hoare annotation was computed. [2020-07-21 20:34:29,553 INFO L264 CegarLoopResult]: At program point L25-2(lines 25 27) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= .cse0 main_~k~0) (<= main_~k~0 main_~n~0) (<= .cse0 main_~j~0))) [2020-07-21 20:34:29,553 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 20:34:29,553 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 37) no Hoare annotation was computed. [2020-07-21 20:34:29,553 INFO L264 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 20:34:29,553 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 37) the Hoare annotation is: true [2020-07-21 20:34:29,554 INFO L264 CegarLoopResult]: At program point L30-1(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 20:34:29,554 INFO L264 CegarLoopResult]: At program point L26(line 26) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= (+ main_~k~0 1) main_~n~0) (<= .cse0 main_~k~0) (<= .cse0 main_~j~0))) [2020-07-21 20:34:29,554 INFO L268 CegarLoopResult]: For program point L26-1(lines 25 27) no Hoare annotation was computed. [2020-07-21 20:34:29,554 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 34) no Hoare annotation was computed. [2020-07-21 20:34:29,554 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 34) the Hoare annotation is: (let ((.cse1 (* 2 main_~i~0)) (.cse0 (<= main_~n~0 main_~k~0)) (.cse2 (<= main_~n~0 main_~j~0))) (or (and (<= main_~k~0 main_~n~0) .cse0) (and (<= main_~k~0 .cse1) .cse0 .cse2) (and (<= (+ (div (+ (* main_~n~0 (- 1)) 1) (- 2)) 1) main_~i~0) (<= main_~j~0 .cse1) .cse0 .cse2))) [2020-07-21 20:34:29,554 INFO L268 CegarLoopResult]: For program point L18(lines 18 21) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point L18-1(lines 18 21) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L271 CegarLoopResult]: At program point L35(lines 13 37) the Hoare annotation is: true [2020-07-21 20:34:29,555 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-07-21 20:34:29,555 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-07-21 20:34:29,570 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,572 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,573 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,573 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 08:34:29 BoogieIcfgContainer [2020-07-21 20:34:29,575 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 20:34:29,577 INFO L168 Benchmark]: Toolchain (without parser) took 90668.20 ms. Allocated memory was 144.7 MB in the beginning and 246.9 MB in the end (delta: 102.2 MB). Free memory was 102.6 MB in the beginning and 157.3 MB in the end (delta: -54.7 MB). Peak memory consumption was 109.2 MB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,578 INFO L168 Benchmark]: CDTParser took 0.41 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,579 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.34 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 92.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,580 INFO L168 Benchmark]: Boogie Preprocessor took 35.75 ms. Allocated memory is still 144.7 MB. Free memory was 92.7 MB in the beginning and 91.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,581 INFO L168 Benchmark]: RCFGBuilder took 391.74 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.1 MB in the beginning and 166.5 MB in the end (delta: -75.4 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,582 INFO L168 Benchmark]: TraceAbstraction took 89987.61 ms. Allocated memory was 201.9 MB in the beginning and 246.9 MB in the end (delta: 45.1 MB). Free memory was 165.8 MB in the beginning and 157.3 MB in the end (delta: 8.6 MB). Peak memory consumption was 115.2 MB. Max. memory is 7.1 GB. [2020-07-21 20:34:29,586 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.41 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.34 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 92.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.75 ms. Allocated memory is still 144.7 MB. Free memory was 92.7 MB in the beginning and 91.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 391.74 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.1 MB in the beginning and 166.5 MB in the end (delta: -75.4 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 89987.61 ms. Allocated memory was 201.9 MB in the beginning and 246.9 MB in the end (delta: 45.1 MB). Free memory was 165.8 MB in the beginning and 157.3 MB in the end (delta: 8.6 MB). Peak memory consumption was 115.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((j < n && 2 * i <= k) && k <= n) && 2 * i <= j - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: ((k <= n && n <= k) || ((k <= 2 * i && n <= k) && n <= j)) || ((((n * -1 + 1) / -2 + 1 <= i && j <= 2 * i) && n <= k) && n <= j) - InvariantResult [Line: 23]: Loop Invariant [2020-07-21 20:34:29,607 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,608 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,608 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-21 20:34:29,608 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] Derived loop invariant: (((k <= n && n <= k) && 2 * i <= j) || ((((forall main_~n~0 : int :: k < main_~n~0 || main_~n~0 * -1 / -2 < i + 2) && k <= j) && n <= k) && 2 * i <= j)) || ((((n * -1 + 1) / -2 + 1 <= j / 2 && j <= 2 * i) && n <= k) && 2 * i <= j) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 77.3s, OverallIterations: 8, TraceHistogramMax: 5, AutomataDifference: 71.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 12.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 237 SDtfs, 129 SDslu, 601 SDs, 0 SdLazy, 586 SolverSat, 125 SolverUnsat, 22 SolverUnknown, 0 SolverNotchecked, 45.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 354 GetRequests, 273 SyntacticMatches, 10 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 27.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 53 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 12 LocationsWithAnnotation, 52 PreInvPairs, 114 NumberOfFragments, 181 HoareAnnotationTreeSize, 52 FomulaSimplifications, 3567 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 12 FomulaSimplificationsInter, 617 FormulaSimplificationTreeSizeReductionInter, 12.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.3s InterpolantComputationTime, 223 NumberOfCodeBlocks, 179 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 315 ConstructedInterpolants, 1 QuantifiedInterpolants, 20354 SizeOfPredicates, 27 NumberOfNonLiveVariables, 438 ConjunctsInSsa, 41 ConjunctsInUnsatCore, 11 InterpolantComputations, 5 PerfectInterpolantSequences, 132/152 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...