/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:49:19,311 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:49:19,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:49:19,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:49:19,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:49:19,337 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:49:19,340 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:49:19,341 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:49:19,343 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:49:19,345 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:49:19,345 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:49:19,346 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:49:19,348 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:49:19,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:49:19,352 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:49:19,353 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:49:19,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:49:19,358 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:49:19,363 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:49:19,368 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:49:19,372 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:49:19,374 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:49:19,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:49:19,408 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 00:49:19,409 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 00:49:19,412 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 00:49:19,413 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 00:49:19,447 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:49:19,447 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:49:19,449 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:49:19,450 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:49:19,450 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:49:19,450 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:49:19,450 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:49:19,451 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:49:19,451 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:49:19,451 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:49:19,451 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:49:19,452 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:49:19,452 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:49:19,452 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:49:19,452 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:49:19,452 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:49:19,453 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:49:19,453 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:49:19,453 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:49:19,453 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:49:19,454 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:49:19,454 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:49:19,454 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:49:19,454 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:49:19,454 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:49:19,455 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:49:19,455 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:19,455 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:49:19,455 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:49:19,456 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 00:49:19,874 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:49:19,895 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:49:19,900 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:49:19,902 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:49:19,902 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:49:19,903 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 00:49:19,979 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5c80939/acc1522cc4444cbe927b770e175d4c0c/FLAG8a178eac2 [2020-07-21 00:49:20,491 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:49:20,493 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 00:49:20,500 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5c80939/acc1522cc4444cbe927b770e175d4c0c/FLAG8a178eac2 [2020-07-21 00:49:20,868 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5c80939/acc1522cc4444cbe927b770e175d4c0c [2020-07-21 00:49:20,879 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:49:20,883 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:49:20,887 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:49:20,887 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:49:20,892 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:49:20,893 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:49:20" (1/1) ... [2020-07-21 00:49:20,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19dbf883 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:20, skipping insertion in model container [2020-07-21 00:49:20,896 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:49:20" (1/1) ... [2020-07-21 00:49:20,905 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:49:20,925 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:49:21,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:49:21,142 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:49:21,156 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:49:21,167 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:49:21,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21 WrapperNode [2020-07-21 00:49:21,168 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:49:21,169 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:49:21,169 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:49:21,169 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:49:21,179 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,179 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,266 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,266 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,270 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,273 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,274 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (1/1) ... [2020-07-21 00:49:21,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:49:21,276 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:49:21,276 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:49:21,276 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:49:21,281 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (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 00:49:21,349 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:49:21,349 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:49:21,349 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 00:49:21,349 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 00:49:21,350 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:49:21,350 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:49:21,350 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:49:21,350 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 00:49:21,350 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 00:49:21,350 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:49:21,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:49:21,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:49:21,545 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:49:21,545 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:49:21,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:49:21 BoogieIcfgContainer [2020-07-21 00:49:21,550 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:49:21,551 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:49:21,551 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:49:21,555 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:49:21,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:49:20" (1/3) ... [2020-07-21 00:49:21,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13088f3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:49:21, skipping insertion in model container [2020-07-21 00:49:21,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:49:21" (2/3) ... [2020-07-21 00:49:21,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13088f3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:49:21, skipping insertion in model container [2020-07-21 00:49:21,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:49:21" (3/3) ... [2020-07-21 00:49:21,559 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-21 00:49:21,570 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:49:21,582 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:49:21,598 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:49:21,633 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:49:21,633 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:49:21,634 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:49:21,634 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:49:21,634 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:49:21,634 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:49:21,634 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:49:21,635 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:49:21,684 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 00:49:21,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:49:21,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:21,704 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:21,705 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:21,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:21,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 00:49:21,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:21,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493856141] [2020-07-21 00:49:21,737 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:21,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:21,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:21,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:49:21,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:21,903 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 00:49:21,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:49:21,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493856141] [2020-07-21 00:49:21,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:49:21,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:49:21,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270283161] [2020-07-21 00:49:21,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:49:21,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:21,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:49:21,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:49:21,925 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 00:49:22,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:22,056 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 00:49:22,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:49:22,059 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:49:22,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:22,071 INFO L225 Difference]: With dead ends: 44 [2020-07-21 00:49:22,072 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 00:49:22,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 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 00:49:22,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 00:49:22,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 00:49:22,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:49:22,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 00:49:22,132 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 00:49:22,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:22,133 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 00:49:22,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:49:22,134 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 00:49:22,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:49:22,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:22,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:22,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:22,356 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:22,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:22,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 00:49:22,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:22,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930239924] [2020-07-21 00:49:22,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:22,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:22,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:22,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:49:22,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:22,435 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 00:49:22,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:49:22,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930239924] [2020-07-21 00:49:22,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:49:22,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:49:22,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198612253] [2020-07-21 00:49:22,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:49:22,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:22,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:49:22,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:49:22,445 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 00:49:22,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:22,531 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 00:49:22,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:49:22,532 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:49:22,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:22,534 INFO L225 Difference]: With dead ends: 36 [2020-07-21 00:49:22,534 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:49:22,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 00:49:22,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:49:22,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:49:22,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:49:22,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 00:49:22,546 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 00:49:22,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:22,547 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 00:49:22,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:49:22,547 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 00:49:22,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:49:22,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:22,549 INFO L422 BasicCegarLoop]: trace histogram [2, 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 00:49:22,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:22,759 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:22,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:22,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 00:49:22,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:22,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511928958] [2020-07-21 00:49:22,763 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:22,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:22,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:22,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:49:22,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:22,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:49:22,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:23,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:23,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:23,165 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:49:23,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511928958] [2020-07-21 00:49:23,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:23,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 00:49:23,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774524225] [2020-07-21 00:49:23,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 00:49:23,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:23,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 00:49:23,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 00:49:23,169 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 00:49:23,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:23,324 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 00:49:23,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:49:23,326 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 00:49:23,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:23,328 INFO L225 Difference]: With dead ends: 41 [2020-07-21 00:49:23,328 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 00:49:23,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:49:23,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 00:49:23,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 00:49:23,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 00:49:23,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 00:49:23,351 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 00:49:23,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:23,352 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 00:49:23,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 00:49:23,352 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 00:49:23,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:49:23,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:23,355 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, 1, 1, 1] [2020-07-21 00:49:23,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:23,570 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:23,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:23,571 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 00:49:23,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:23,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390184104] [2020-07-21 00:49:23,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:23,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:23,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:23,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:49:23,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:23,665 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:49:23,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:23,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:23,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:23,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:49:23,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390184104] [2020-07-21 00:49:23,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:23,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 00:49:23,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534079185] [2020-07-21 00:49:23,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 00:49:23,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:23,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 00:49:23,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 00:49:23,865 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 00:49:23,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:23,994 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 00:49:23,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:49:23,994 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 00:49:23,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:23,996 INFO L225 Difference]: With dead ends: 46 [2020-07-21 00:49:23,997 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 00:49:23,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:49:23,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 00:49:24,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 00:49:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 00:49:24,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 00:49:24,007 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 00:49:24,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:24,008 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 00:49:24,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 00:49:24,008 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 00:49:24,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:49:24,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:24,010 INFO L422 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1] [2020-07-21 00:49:24,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:24,225 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:24,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:24,226 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 00:49:24,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:24,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449805700] [2020-07-21 00:49:24,228 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:24,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:24,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:24,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:49:24,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:24,321 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:49:24,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:24,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:24,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:24,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:24,726 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:49:24,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449805700] [2020-07-21 00:49:24,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:24,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 00:49:24,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133774407] [2020-07-21 00:49:24,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:49:24,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:24,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:49:24,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:49:24,732 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 00:49:24,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:24,907 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 00:49:24,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:49:24,909 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 00:49:24,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:24,911 INFO L225 Difference]: With dead ends: 51 [2020-07-21 00:49:24,911 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 00:49:24,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:24,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 00:49:24,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 00:49:24,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 00:49:24,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 00:49:24,924 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 00:49:24,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:24,924 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 00:49:24,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:49:24,925 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 00:49:24,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 00:49:24,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:24,927 INFO L422 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:25,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:25,130 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:25,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:25,131 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 00:49:25,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:25,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652138326] [2020-07-21 00:49:25,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:25,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:25,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:25,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:49:25,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:25,212 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 00:49:25,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:25,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:25,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:25,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:25,534 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:49:25,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652138326] [2020-07-21 00:49:25,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:25,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 00:49:25,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761485941] [2020-07-21 00:49:25,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:49:25,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:25,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:49:25,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:49:25,537 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 00:49:25,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:25,704 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 00:49:25,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:49:25,705 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 00:49:25,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:25,707 INFO L225 Difference]: With dead ends: 56 [2020-07-21 00:49:25,707 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 00:49:25,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:25,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 00:49:25,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 00:49:25,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 00:49:25,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 00:49:25,719 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 00:49:25,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:25,720 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 00:49:25,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:49:25,720 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 00:49:25,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 00:49:25,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:25,723 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:25,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:25,938 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:25,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:25,938 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 00:49:25,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:25,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143047488] [2020-07-21 00:49:25,939 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 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 00:49:25,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:25,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:25,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:25,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:26,054 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 00:49:26,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:26,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:26,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:26,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:26,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:26,688 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 00:49:26,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143047488] [2020-07-21 00:49:26,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:26,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 00:49:26,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401855552] [2020-07-21 00:49:26,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:49:26,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:26,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:49:26,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:49:26,690 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 00:49:26,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:26,889 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 00:49:26,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:26,889 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 00:49:26,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:26,892 INFO L225 Difference]: With dead ends: 61 [2020-07-21 00:49:26,892 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 00:49:26,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:49:26,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 00:49:26,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 00:49:26,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 00:49:26,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 00:49:26,914 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 00:49:26,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:26,917 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 00:49:26,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:49:26,917 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 00:49:26,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 00:49:26,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:26,924 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:27,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:27,125 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:27,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:27,126 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 00:49:27,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:27,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107008136] [2020-07-21 00:49:27,128 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 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 00:49:27,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:27,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:27,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:27,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 00:49:27,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:27,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:27,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:27,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:27,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:27,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:27,787 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 00:49:27,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107008136] [2020-07-21 00:49:27,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:27,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 00:49:27,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451734716] [2020-07-21 00:49:27,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:49:27,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:27,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:49:27,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:49:27,790 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 00:49:27,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:27,989 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 00:49:27,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:27,989 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 00:49:27,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:27,992 INFO L225 Difference]: With dead ends: 66 [2020-07-21 00:49:27,992 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 00:49:27,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:49:27,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 00:49:28,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 00:49:28,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 00:49:28,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 00:49:28,005 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 00:49:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:28,005 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 00:49:28,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:49:28,006 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 00:49:28,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 00:49:28,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:28,008 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:28,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:28,218 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:28,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:28,218 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 00:49:28,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:28,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67605689] [2020-07-21 00:49:28,220 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:28,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:28,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:28,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:28,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:28,368 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 00:49:28,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:28,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:29,346 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 00:49:29,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67605689] [2020-07-21 00:49:29,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:29,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 00:49:29,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320197449] [2020-07-21 00:49:29,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 00:49:29,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:29,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 00:49:29,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:49:29,349 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 00:49:29,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:29,606 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 00:49:29,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:29,606 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 00:49:29,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:29,609 INFO L225 Difference]: With dead ends: 71 [2020-07-21 00:49:29,609 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 00:49:29,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:49:29,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 00:49:29,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 00:49:29,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 00:49:29,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 00:49:29,623 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 00:49:29,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:29,624 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 00:49:29,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 00:49:29,624 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 00:49:29,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 00:49:29,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:29,626 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:29,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:29,840 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:29,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:29,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 00:49:29,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:29,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107984225] [2020-07-21 00:49:29,843 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:29,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:49:29,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:29,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:29,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:30,005 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 00:49:30,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:30,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:30,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:30,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:30,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:30,926 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 00:49:30,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107984225] [2020-07-21 00:49:30,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:30,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:30,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435524031] [2020-07-21 00:49:30,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:30,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:30,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:30,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:30,932 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-21 00:49:31,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:31,187 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 00:49:31,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:31,188 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-21 00:49:31,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:31,190 INFO L225 Difference]: With dead ends: 76 [2020-07-21 00:49:31,190 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 00:49:31,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:31,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 00:49:31,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 00:49:31,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 00:49:31,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 00:49:31,219 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 00:49:31,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:31,222 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 00:49:31,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:31,222 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 00:49:31,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 00:49:31,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:31,228 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:31,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:31,429 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:31,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:31,430 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 00:49:31,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:31,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944240178] [2020-07-21 00:49:31,431 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:31,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:49:31,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:31,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:49:31,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:31,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 00:49:31,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:32,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:32,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:32,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:33,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 00:49:33,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944240178] [2020-07-21 00:49:33,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:33,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:49:33,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600574119] [2020-07-21 00:49:33,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:49:33,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:33,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:49:33,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:33,292 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-21 00:49:33,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:33,579 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 00:49:33,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:49:33,579 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-21 00:49:33,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:33,582 INFO L225 Difference]: With dead ends: 81 [2020-07-21 00:49:33,582 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 00:49:33,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:49:33,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 00:49:33,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 00:49:33,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 00:49:33,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 00:49:33,595 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 00:49:33,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:33,595 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 00:49:33,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:49:33,596 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 00:49:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 00:49:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:33,598 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:33,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:33,813 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:33,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:33,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-21 00:49:33,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:33,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640510617] [2020-07-21 00:49:33,815 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:33,891 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:33,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:33,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:33,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:33,961 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 00:49:33,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:34,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:34,968 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 00:49:34,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640510617] [2020-07-21 00:49:34,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:34,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:34,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62214753] [2020-07-21 00:49:34,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:34,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:34,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:34,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:34,972 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-21 00:49:35,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:35,180 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-21 00:49:35,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:35,185 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 00:49:35,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:35,188 INFO L225 Difference]: With dead ends: 99 [2020-07-21 00:49:35,188 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 00:49:35,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:35,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 00:49:35,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-21 00:49:35,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 00:49:35,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-21 00:49:35,201 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-21 00:49:35,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:35,202 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-21 00:49:35,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:35,202 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-21 00:49:35,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 00:49:35,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:35,204 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:35,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:35,420 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:35,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:35,421 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-21 00:49:35,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:35,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465896506] [2020-07-21 00:49:35,422 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:35,506 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:35,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:35,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:35,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:35,573 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-21 00:49:35,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:35,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:36,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:36,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:36,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:36,282 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-21 00:49:36,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465896506] [2020-07-21 00:49:36,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:36,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:36,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004354503] [2020-07-21 00:49:36,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:36,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:36,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:36,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:36,284 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-21 00:49:36,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:36,494 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-21 00:49:36,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:36,494 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-21 00:49:36,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:36,497 INFO L225 Difference]: With dead ends: 99 [2020-07-21 00:49:36,497 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 00:49:36,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:36,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 00:49:36,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-21 00:49:36,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 00:49:36,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-21 00:49:36,519 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-21 00:49:36,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:36,519 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-21 00:49:36,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:36,519 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-21 00:49:36,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-21 00:49:36,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:36,522 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:36,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:36,727 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:36,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:36,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-21 00:49:36,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:36,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539079381] [2020-07-21 00:49:36,729 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:36,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:36,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:36,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:49:36,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:36,943 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 292 refuted. 0 times theorem prover too weak. 843 trivial. 0 not checked. [2020-07-21 00:49:36,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:38,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:38,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-21 00:49:38,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539079381] [2020-07-21 00:49:38,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:38,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:49:38,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672661399] [2020-07-21 00:49:38,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:49:38,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:38,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:49:38,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:38,644 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-21 00:49:39,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:39,012 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-21 00:49:39,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:49:39,013 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-21 00:49:39,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:39,015 INFO L225 Difference]: With dead ends: 113 [2020-07-21 00:49:39,016 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 00:49:39,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:49:39,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 00:49:39,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-21 00:49:39,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 00:49:39,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-21 00:49:39,028 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-21 00:49:39,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:39,029 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-21 00:49:39,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:49:39,030 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-21 00:49:39,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 00:49:39,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:39,033 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:39,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:39,246 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:39,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:39,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-21 00:49:39,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:39,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393018965] [2020-07-21 00:49:39,247 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:39,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:49:39,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:39,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:39,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:39,449 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-21 00:49:39,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:40,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:40,430 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-21 00:49:40,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393018965] [2020-07-21 00:49:40,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:40,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:40,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550464448] [2020-07-21 00:49:40,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:40,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:40,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:40,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:40,433 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-21 00:49:40,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:40,671 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-21 00:49:40,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:40,672 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 00:49:40,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:40,680 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:49:40,680 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 00:49:40,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:40,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 00:49:40,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-21 00:49:40,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 00:49:40,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-21 00:49:40,707 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-21 00:49:40,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:40,708 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-21 00:49:40,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:40,708 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-21 00:49:40,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 00:49:40,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:40,711 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:40,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:40,926 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:40,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:40,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-21 00:49:40,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:40,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369167499] [2020-07-21 00:49:40,928 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:41,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:41,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:41,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:49:41,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:41,189 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 116 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2020-07-21 00:49:41,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:42,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:42,822 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 00:49:42,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369167499] [2020-07-21 00:49:42,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:42,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:49:42,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151882625] [2020-07-21 00:49:42,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:49:42,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:42,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:49:42,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:42,826 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-21 00:49:43,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:43,221 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-21 00:49:43,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:49:43,222 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-21 00:49:43,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:43,224 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:49:43,224 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 00:49:43,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:49:43,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 00:49:43,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 00:49:43,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 00:49:43,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-21 00:49:43,236 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-21 00:49:43,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:43,237 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-21 00:49:43,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:49:43,237 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-21 00:49:43,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 00:49:43,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:43,240 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:43,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:43,454 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:43,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:43,454 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-21 00:49:43,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:43,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125829544] [2020-07-21 00:49:43,455 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:43,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:43,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:43,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:43,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:43,636 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-21 00:49:43,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:44,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:44,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:44,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:44,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:44,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:44,335 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-21 00:49:44,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125829544] [2020-07-21 00:49:44,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:44,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:44,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476800185] [2020-07-21 00:49:44,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:44,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:44,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:44,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:44,338 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-21 00:49:44,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:44,541 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 00:49:44,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:44,541 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-21 00:49:44,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:44,543 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:49:44,544 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 00:49:44,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:44,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 00:49:44,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-21 00:49:44,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 00:49:44,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-21 00:49:44,571 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-21 00:49:44,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:44,572 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-21 00:49:44,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:44,572 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-21 00:49:44,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 00:49:44,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:44,576 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:44,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:44,789 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:44,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:44,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-21 00:49:44,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:44,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239089813] [2020-07-21 00:49:44,791 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:44,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:44,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:44,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:44,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:45,041 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-21 00:49:45,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:45,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:45,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:45,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:45,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:46,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:46,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:46,162 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-21 00:49:46,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239089813] [2020-07-21 00:49:46,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:46,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:46,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158762029] [2020-07-21 00:49:46,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:46,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:46,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:46,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:46,165 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-21 00:49:46,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:46,402 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-21 00:49:46,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:46,403 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 00:49:46,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:46,405 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:49:46,405 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 00:49:46,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:46,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 00:49:46,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 00:49:46,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 00:49:46,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 00:49:46,421 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-21 00:49:46,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:46,421 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 00:49:46,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:46,422 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 00:49:46,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 00:49:46,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:46,424 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:46,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:46,639 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:46,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:46,639 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-21 00:49:46,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:46,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687810855] [2020-07-21 00:49:46,640 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:46,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:46,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:46,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:46,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:46,869 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 00:49:46,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:47,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:47,578 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:49:47,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687810855] [2020-07-21 00:49:47,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:47,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:47,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399518031] [2020-07-21 00:49:47,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:47,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:47,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:47,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:47,580 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 00:49:47,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:47,752 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-21 00:49:47,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:47,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-21 00:49:47,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:47,755 INFO L225 Difference]: With dead ends: 114 [2020-07-21 00:49:47,755 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 00:49:47,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:47,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 00:49:47,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-21 00:49:47,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 00:49:47,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 00:49:47,766 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-21 00:49:47,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:47,766 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 00:49:47,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:47,767 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 00:49:47,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 00:49:47,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:47,769 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:47,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:47,982 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:47,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:47,983 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-21 00:49:47,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:47,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393867928] [2020-07-21 00:49:47,984 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:48,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:48,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:48,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:48,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-21 00:49:48,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:48,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:48,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:48,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:48,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:48,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:48,996 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:49:48,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393867928] [2020-07-21 00:49:48,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:48,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:48,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191802398] [2020-07-21 00:49:48,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:48,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:48,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:48,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:48,998 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 00:49:49,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:49,170 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-21 00:49:49,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:49,171 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-21 00:49:49,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:49,173 INFO L225 Difference]: With dead ends: 106 [2020-07-21 00:49:49,173 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 00:49:49,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:49,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 00:49:49,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 00:49:49,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 00:49:49,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-21 00:49:49,186 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-21 00:49:49,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:49,187 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-21 00:49:49,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:49,187 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-21 00:49:49,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-21 00:49:49,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:49,190 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:49,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:49,404 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:49,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:49,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-21 00:49:49,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:49,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887723354] [2020-07-21 00:49:49,406 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:49,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:49,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:49,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:49,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:49,659 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 00:49:49,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:50,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:50,753 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-21 00:49:50,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887723354] [2020-07-21 00:49:50,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:50,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:50,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596430897] [2020-07-21 00:49:50,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:50,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:50,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:50,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:50,756 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-21 00:49:51,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:51,000 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 00:49:51,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:51,001 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-21 00:49:51,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:51,004 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:49:51,004 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 00:49:51,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:51,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 00:49:51,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-21 00:49:51,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 00:49:51,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-21 00:49:51,017 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-21 00:49:51,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:51,017 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-21 00:49:51,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:51,018 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-21 00:49:51,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 00:49:51,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:51,020 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:51,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:51,235 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:51,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:51,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-21 00:49:51,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:51,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239226578] [2020-07-21 00:49:51,237 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:51,436 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:51,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:51,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:51,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:51,528 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-21 00:49:51,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:51,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:51,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-21 00:49:52,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239226578] [2020-07-21 00:49:52,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:52,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:52,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292104444] [2020-07-21 00:49:52,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:52,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:52,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:52,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:52,333 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-21 00:49:52,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:52,527 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-21 00:49:52,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:52,528 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-21 00:49:52,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:52,530 INFO L225 Difference]: With dead ends: 129 [2020-07-21 00:49:52,531 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 00:49:52,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:52,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 00:49:52,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-21 00:49:52,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 00:49:52,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 00:49:52,544 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-21 00:49:52,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:52,545 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 00:49:52,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:52,545 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 00:49:52,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-21 00:49:52,547 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:52,547 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:52,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:52,761 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:52,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:52,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-21 00:49:52,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:52,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487317783] [2020-07-21 00:49:52,763 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:52,930 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:52,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:52,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:49:52,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:53,024 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-21 00:49:53,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:53,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:53,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:53,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:53,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:53,623 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-21 00:49:53,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487317783] [2020-07-21 00:49:53,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:53,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 00:49:53,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270817546] [2020-07-21 00:49:53,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:49:53,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:53,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:49:53,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:49:53,626 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-21 00:49:53,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:53,779 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-21 00:49:53,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:49:53,779 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-21 00:49:53,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:53,782 INFO L225 Difference]: With dead ends: 131 [2020-07-21 00:49:53,782 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 00:49:53,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:49:53,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 00:49:53,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-21 00:49:53,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-21 00:49:53,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-21 00:49:53,795 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-21 00:49:53,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:53,796 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-21 00:49:53,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:49:53,796 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-21 00:49:53,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-21 00:49:53,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:53,798 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:54,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:54,014 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:54,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:54,015 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-21 00:49:54,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:54,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113058310] [2020-07-21 00:49:54,016 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:54,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:54,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:54,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:49:54,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-21 00:49:54,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:54,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:54,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:54,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:54,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:54,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:55,158 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-21 00:49:55,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113058310] [2020-07-21 00:49:55,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:55,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 00:49:55,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975923726] [2020-07-21 00:49:55,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:49:55,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:55,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:49:55,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:49:55,163 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-21 00:49:55,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:55,347 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-21 00:49:55,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:49:55,347 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-21 00:49:55,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:55,350 INFO L225 Difference]: With dead ends: 110 [2020-07-21 00:49:55,350 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 00:49:55,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:55,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 00:49:55,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-21 00:49:55,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 00:49:55,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 00:49:55,362 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-21 00:49:55,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:55,363 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 00:49:55,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:49:55,363 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 00:49:55,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 00:49:55,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:55,366 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:55,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:55,581 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:55,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:55,581 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-21 00:49:55,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:55,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57123721] [2020-07-21 00:49:55,582 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:55,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:49:55,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:55,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:49:55,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:55,888 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 47 refuted. 0 times theorem prover too weak. 640 trivial. 0 not checked. [2020-07-21 00:49:55,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:56,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:56,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:56,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:56,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:56,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:56,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:57,059 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-21 00:49:57,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57123721] [2020-07-21 00:49:57,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:57,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:49:57,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503527719] [2020-07-21 00:49:57,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:49:57,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:57,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:49:57,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:49:57,062 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-21 00:49:57,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:57,347 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-21 00:49:57,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:49:57,348 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-21 00:49:57,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:57,350 INFO L225 Difference]: With dead ends: 123 [2020-07-21 00:49:57,351 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 00:49:57,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:49:57,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 00:49:57,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-21 00:49:57,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 00:49:57,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-21 00:49:57,373 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-21 00:49:57,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:57,373 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-21 00:49:57,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:49:57,374 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-21 00:49:57,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-21 00:49:57,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:57,377 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:49:57,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:57,593 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:49:57,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:49:57,593 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-21 00:49:57,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:49:57,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699682758] [2020-07-21 00:49:57,594 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:49:57,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:49:57,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:49:57,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:49:57,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:57,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 102 refuted. 0 times theorem prover too weak. 701 trivial. 0 not checked. [2020-07-21 00:49:57,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:49:58,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:58,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:49:59,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-21 00:49:59,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699682758] [2020-07-21 00:49:59,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:49:59,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:49:59,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590787370] [2020-07-21 00:49:59,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:49:59,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:49:59,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:49:59,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:49:59,550 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-21 00:49:59,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:49:59,887 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-21 00:49:59,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:49:59,887 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-21 00:49:59,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:49:59,890 INFO L225 Difference]: With dead ends: 121 [2020-07-21 00:49:59,890 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 00:49:59,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:49:59,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 00:49:59,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-21 00:49:59,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 00:49:59,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-21 00:49:59,902 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-21 00:49:59,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:49:59,903 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-21 00:49:59,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:49:59,903 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-21 00:49:59,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 00:49:59,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:49:59,906 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:00,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:00,120 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:00,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:00,121 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-21 00:50:00,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:00,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178711369] [2020-07-21 00:50:00,122 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:00,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:50:00,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:50:00,319 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:50:00,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:50:00,356 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:50:00,393 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:50:00,393 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:50:00,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:00,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:50:00 BoogieIcfgContainer [2020-07-21 00:50:00,662 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:50:00,667 INFO L168 Benchmark]: Toolchain (without parser) took 39784.32 ms. Allocated memory was 136.3 MB in the beginning and 572.5 MB in the end (delta: 436.2 MB). Free memory was 99.4 MB in the beginning and 406.7 MB in the end (delta: -307.3 MB). Peak memory consumption was 128.9 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,667 INFO L168 Benchmark]: CDTParser took 0.56 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,668 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.35 ms. Allocated memory is still 136.3 MB. Free memory was 99.2 MB in the beginning and 89.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,668 INFO L168 Benchmark]: Boogie Preprocessor took 107.18 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 89.5 MB in the beginning and 178.7 MB in the end (delta: -89.2 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,668 INFO L168 Benchmark]: RCFGBuilder took 273.65 ms. Allocated memory is still 200.3 MB. Free memory was 178.7 MB in the beginning and 165.6 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,669 INFO L168 Benchmark]: TraceAbstraction took 39110.93 ms. Allocated memory was 200.3 MB in the beginning and 572.5 MB in the end (delta: 372.2 MB). Free memory was 164.9 MB in the beginning and 406.7 MB in the end (delta: -241.7 MB). Peak memory consumption was 130.5 MB. Max. memory is 7.1 GB. [2020-07-21 00:50:00,671 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.56 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.35 ms. Allocated memory is still 136.3 MB. Free memory was 99.2 MB in the beginning and 89.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.18 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 89.5 MB in the beginning and 178.7 MB in the end (delta: -89.2 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 273.65 ms. Allocated memory is still 200.3 MB. Free memory was 178.7 MB in the beginning and 165.6 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 39110.93 ms. Allocated memory was 200.3 MB in the beginning and 572.5 MB in the end (delta: 372.2 MB). Free memory was 164.9 MB in the beginning and 406.7 MB in the end (delta: -241.7 MB). Peak memory consumption was 130.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 38.9s, OverallIterations: 27, TraceHistogramMax: 18, AutomataDifference: 5.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 635 SDtfs, 1047 SDslu, 3546 SDs, 0 SdLazy, 3609 SolverSat, 845 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6247 GetRequests, 5623 SyntacticMatches, 225 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 5.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 26 MinimizatonAttempts, 424 StatesRemovedByMinimization, 23 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 23.7s InterpolantComputationTime, 3264 NumberOfCodeBlocks, 2359 NumberOfCodeBlocksAsserted, 72 NumberOfCheckSat, 6097 ConstructedInterpolants, 0 QuantifiedInterpolants, 1528887 SizeOfPredicates, 132 NumberOfNonLiveVariables, 4876 ConjunctsInSsa, 264 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 19507/23532 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 incorrect! Received shutdown request...