/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:18:13,344 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:18:13,346 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:18:13,358 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:18:13,358 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:18:13,359 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:18:13,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:18:13,362 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:18:13,364 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:18:13,365 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:18:13,366 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:18:13,367 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:18:13,367 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:18:13,368 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:18:13,369 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:18:13,370 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:18:13,371 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:18:13,372 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:18:13,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:18:13,375 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:18:13,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:18:13,378 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:18:13,379 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:18:13,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:18:13,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:18:13,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:18:13,390 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:18:13,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:18:13,392 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 [2020-07-20 22:18:13,407 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:18:13,407 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:18:13,408 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:18:13,408 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:18:13,408 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:18:13,409 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:18:13,409 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:18:13,409 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:18:13,409 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:18:13,409 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:18:13,409 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:18:13,410 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:18:13,411 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:18:13,411 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:18:13,411 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:18:13,411 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:18:13,411 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:18:13,412 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:18:13,412 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:18:13,412 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:18:13,412 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:18:13,412 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:13,413 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:18:13,413 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:18:13,413 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 -> 4 [2020-07-20 22:18:13,692 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:18:13,705 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:18:13,709 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:18:13,710 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:18:13,711 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:18:13,711 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-20 22:18:13,788 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34a8f60c8/9ca47baf7a8d4ea6949022550b374951/FLAGb23744e97 [2020-07-20 22:18:14,243 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:18:14,244 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-20 22:18:14,250 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34a8f60c8/9ca47baf7a8d4ea6949022550b374951/FLAGb23744e97 [2020-07-20 22:18:14,674 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34a8f60c8/9ca47baf7a8d4ea6949022550b374951 [2020-07-20 22:18:14,682 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:18:14,684 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:18:14,685 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:18:14,685 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:18:14,689 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:18:14,690 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:14,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2554a81c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14, skipping insertion in model container [2020-07-20 22:18:14,693 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:14,700 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:18:14,715 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:18:14,873 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:18:14,877 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:18:14,892 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:18:14,907 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:18:14,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14 WrapperNode [2020-07-20 22:18:14,907 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:18:14,908 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:18:14,908 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:18:14,908 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:18:14,918 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:14,918 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:14,923 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:14,923 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:15,006 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:15,011 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:15,012 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (1/1) ... [2020-07-20 22:18:15,013 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:18:15,014 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:18:15,014 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:18:15,014 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:18:15,015 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (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 [2020-07-20 22:18:15,085 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:18:15,085 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:18:15,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:18:15,085 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:18:15,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:18:15,086 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:18:15,086 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:18:15,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:18:15,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:18:15,249 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:18:15,249 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:18:15,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:18:15 BoogieIcfgContainer [2020-07-20 22:18:15,253 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:18:15,254 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:18:15,254 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:18:15,257 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:18:15,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:18:14" (1/3) ... [2020-07-20 22:18:15,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ef5abd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:18:15, skipping insertion in model container [2020-07-20 22:18:15,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:14" (2/3) ... [2020-07-20 22:18:15,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ef5abd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:18:15, skipping insertion in model container [2020-07-20 22:18:15,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:18:15" (3/3) ... [2020-07-20 22:18:15,261 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-07-20 22:18:15,271 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:18:15,278 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:18:15,290 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:18:15,311 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:18:15,311 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:18:15,311 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:18:15,311 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:18:15,312 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:18:15,312 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:18:15,312 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:18:15,312 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:18:15,328 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-20 22:18:15,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 22:18:15,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:15,333 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:15,333 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:15,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:15,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-20 22:18:15,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:15,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639982678] [2020-07-20 22:18:15,346 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 [2020-07-20 22:18:15,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:18:15,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:15,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 22:18:15,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:15,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:15,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:18:15,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639982678] [2020-07-20 22:18:15,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:18:15,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:18:15,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692363925] [2020-07-20 22:18:15,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:18:15,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:15,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:18:15,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:18:15,495 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-20 22:18:15,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:15,530 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 22:18:15,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:18:15,532 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 22:18:15,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:15,541 INFO L225 Difference]: With dead ends: 29 [2020-07-20 22:18:15,541 INFO L226 Difference]: Without dead ends: 12 [2020-07-20 22:18:15,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:18:15,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-20 22:18:15,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-20 22:18:15,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-20 22:18:15,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-20 22:18:15,578 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-20 22:18:15,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:15,579 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-20 22:18:15,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:18:15,579 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-20 22:18:15,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 22:18:15,580 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:15,580 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:15,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:15,782 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:15,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:15,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-20 22:18:15,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:15,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385980942] [2020-07-20 22:18:15,785 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 [2020-07-20 22:18:15,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:18:15,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:15,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:18:15,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:15,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:15,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:15,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:15,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385980942] [2020-07-20 22:18:15,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:15,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 22:18:15,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221342505] [2020-07-20 22:18:15,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:18:15,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:15,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:18:15,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:18:15,889 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-20 22:18:15,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:15,968 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 22:18:15,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:18:15,969 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-20 22:18:15,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:15,970 INFO L225 Difference]: With dead ends: 20 [2020-07-20 22:18:15,970 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 22:18:15,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 22:18:15,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 22:18:15,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 22:18:15,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 22:18:15,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 22:18:15,977 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-20 22:18:15,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:15,978 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 22:18:15,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:18:15,978 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 22:18:15,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 22:18:15,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:15,981 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:16,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:16,196 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:16,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:16,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-20 22:18:16,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:16,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549698471] [2020-07-20 22:18:16,199 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 [2020-07-20 22:18:16,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:18:16,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:16,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 22:18:16,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:16,301 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:16,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:18,519 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:18,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549698471] [2020-07-20 22:18:18,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:18,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 22:18:18,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584504322] [2020-07-20 22:18:18,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:18:18,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:18,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:18:18,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=85, Unknown=1, NotChecked=0, Total=132 [2020-07-20 22:18:18,522 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 22:18:20,771 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 22:18:21,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:21,060 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-20 22:18:21,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:18:21,061 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 22:18:21,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:21,062 INFO L225 Difference]: With dead ends: 26 [2020-07-20 22:18:21,062 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 22:18:21,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=94, Invalid=145, Unknown=1, NotChecked=0, Total=240 [2020-07-20 22:18:21,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 22:18:21,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 22:18:21,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 22:18:21,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-20 22:18:21,070 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-20 22:18:21,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:21,071 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-20 22:18:21,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:18:21,071 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-20 22:18:21,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 22:18:21,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:21,072 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:21,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:21,274 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:21,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:21,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-20 22:18:21,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:21,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322988567] [2020-07-20 22:18:21,277 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 [2020-07-20 22:18:21,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:18:21,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:21,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 22:18:21,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:21,530 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:21,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 53 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:18:30,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322988567] [2020-07-20 22:18:30,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:30,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 22:18:30,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873434194] [2020-07-20 22:18:30,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:18:30,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:30,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:18:30,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=382, Unknown=4, NotChecked=0, Total=552 [2020-07-20 22:18:30,323 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-20 22:18:30,955 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 22:18:32,063 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 22:18:32,730 WARN L193 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 22:18:35,240 WARN L193 SmtUtils]: Spent 2.27 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 22:18:43,857 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 22:18:52,785 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 22:19:01,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:19:01,742 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-20 22:19:01,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 22:19:01,747 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-20 22:19:01,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:19:01,748 INFO L225 Difference]: With dead ends: 38 [2020-07-20 22:19:01,748 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 22:19:01,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 40.0s TimeCoverageRelationStatistics Valid=400, Invalid=709, Unknown=13, NotChecked=0, Total=1122 [2020-07-20 22:19:01,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 22:19:01,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 22:19:01,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 22:19:01,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 22:19:01,763 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-20 22:19:01,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:19:01,764 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 22:19:01,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:19:01,764 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 22:19:01,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 22:19:01,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:19:01,767 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:19:01,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:19:01,969 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:19:01,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:19:01,970 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-20 22:19:01,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:19:01,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652660100] [2020-07-20 22:19:01,971 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 [2020-07-20 22:19:02,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:19:02,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:19:02,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 22:19:02,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:19:02,409 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:19:02,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:19:26,909 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 244 refuted. 9 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:19:26,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652660100] [2020-07-20 22:19:26,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:19:26,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 22:19:26,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183076842] [2020-07-20 22:19:26,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 22:19:26,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:19:26,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 22:19:26,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1623, Unknown=11, NotChecked=0, Total=2256 [2020-07-20 22:19:26,913 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 48 states. [2020-07-20 22:19:30,479 WARN L193 SmtUtils]: Spent 2.21 s on a formula simplification. DAG size of input: 116 DAG size of output: 11 [2020-07-20 22:19:33,709 WARN L193 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 111 DAG size of output: 11 [2020-07-20 22:19:42,906 WARN L193 SmtUtils]: Spent 4.98 s on a formula simplification. DAG size of input: 106 DAG size of output: 11 [2020-07-20 22:19:47,100 WARN L193 SmtUtils]: Spent 818.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 11 [2020-07-20 22:19:56,010 WARN L193 SmtUtils]: Spent 724.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 11 [2020-07-20 22:20:04,024 WARN L193 SmtUtils]: Spent 1.54 s on a formula simplification. DAG size of input: 91 DAG size of output: 11 [2020-07-20 22:20:09,761 WARN L193 SmtUtils]: Spent 486.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 11 [2020-07-20 22:20:14,578 WARN L193 SmtUtils]: Spent 746.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 11 [2020-07-20 22:20:20,710 WARN L193 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 22:20:35,460 WARN L193 SmtUtils]: Spent 4.59 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 22:20:50,251 WARN L193 SmtUtils]: Spent 4.36 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 22:20:58,822 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 22:21:07,705 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 22:21:16,247 WARN L193 SmtUtils]: Spent 2.32 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 22:21:22,611 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 22:21:30,748 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 22:21:41,007 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 22:22:13,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:22:13,918 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-20 22:22:13,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 22:22:13,919 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 32 [2020-07-20 22:22:13,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:22:13,921 INFO L225 Difference]: With dead ends: 62 [2020-07-20 22:22:13,921 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 22:22:13,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 189.1s TimeCoverageRelationStatistics Valid=1676, Invalid=3134, Unknown=20, NotChecked=0, Total=4830 [2020-07-20 22:22:13,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 22:22:13,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 22:22:13,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 22:22:13,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-20 22:22:13,934 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-20 22:22:13,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:22:13,935 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-20 22:22:13,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 22:22:13,935 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-20 22:22:13,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 22:22:13,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:13,937 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:14,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:14,141 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:14,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:14,142 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 5 times [2020-07-20 22:22:14,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:14,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531935440] [2020-07-20 22:22:14,143 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 [2020-07-20 22:22:24,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:22:24,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:24,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 22:22:24,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:25,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:22:25,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:24:06,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1049 refuted. 32 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:24:06,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531935440] [2020-07-20 22:24:06,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:24:06,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 22:24:06,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574504008] [2020-07-20 22:24:06,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 22:24:06,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:24:06,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 22:24:06,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2398, Invalid=6677, Unknown=45, NotChecked=0, Total=9120 [2020-07-20 22:24:06,213 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 96 states. [2020-07-20 22:24:33,303 WARN L193 SmtUtils]: Spent 16.31 s on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2020-07-20 22:25:03,930 WARN L193 SmtUtils]: Spent 22.97 s on a formula simplification. DAG size of input: 231 DAG size of output: 11 [2020-07-20 22:25:35,851 WARN L193 SmtUtils]: Spent 15.70 s on a formula simplification. DAG size of input: 226 DAG size of output: 16 [2020-07-20 22:26:09,567 WARN L193 SmtUtils]: Spent 10.57 s on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2020-07-20 22:26:35,743 WARN L193 SmtUtils]: Spent 10.34 s on a formula simplification. DAG size of input: 216 DAG size of output: 11 [2020-07-20 22:27:10,056 WARN L193 SmtUtils]: Spent 13.99 s on a formula simplification. DAG size of input: 211 DAG size of output: 11 [2020-07-20 22:27:54,600 WARN L193 SmtUtils]: Spent 10.62 s on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2020-07-20 22:28:42,441 WARN L193 SmtUtils]: Spent 9.42 s on a formula simplification. DAG size of input: 201 DAG size of output: 11 [2020-07-20 22:29:36,833 WARN L193 SmtUtils]: Spent 10.13 s on a formula simplification. DAG size of input: 196 DAG size of output: 11 [2020-07-20 22:30:16,934 WARN L193 SmtUtils]: Spent 8.76 s on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-20 22:31:02,812 WARN L193 SmtUtils]: Spent 9.57 s on a formula simplification. DAG size of input: 186 DAG size of output: 11 [2020-07-20 22:31:45,769 WARN L193 SmtUtils]: Spent 8.83 s on a formula simplification. DAG size of input: 181 DAG size of output: 11 [2020-07-20 22:32:37,956 WARN L193 SmtUtils]: Spent 13.76 s on a formula simplification. DAG size of input: 176 DAG size of output: 11