/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:56:43,322 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:56:43,324 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:56:43,337 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:56:43,337 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:56:43,338 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:56:43,340 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:56:43,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:56:43,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:56:43,344 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:56:43,345 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:56:43,346 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:56:43,347 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:56:43,348 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:56:43,349 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:56:43,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:56:43,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:56:43,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:56:43,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:56:43,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:56:43,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:56:43,359 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:56:43,360 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:56:43,361 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:56:43,364 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:56:43,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:56:43,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:56:43,373 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:56:43,374 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:56:43,389 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:56:43,390 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:56:43,391 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:56:43,391 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:56:43,391 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:56:43,392 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:56:43,392 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:56:43,392 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:56:43,392 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:56:43,392 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:56:43,393 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:56:43,394 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:56:43,394 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:56:43,394 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:56:43,394 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:56:43,394 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:56:43,395 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:43,395 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:56:43,395 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:56:43,395 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:56:43,395 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:56:43,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:43,396 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:56:43,396 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:56:43,396 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:56:43,689 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:56:43,704 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:56:43,708 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:56:43,709 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:56:43,710 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:56:43,711 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-1.c [2020-07-20 16:56:43,784 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd6cc2ffc/2754291ebde1497c889afc85ebf04274/FLAG4ce7d80da [2020-07-20 16:56:44,238 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:56:44,239 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i10_o10-1.c [2020-07-20 16:56:44,246 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd6cc2ffc/2754291ebde1497c889afc85ebf04274/FLAG4ce7d80da [2020-07-20 16:56:44,676 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd6cc2ffc/2754291ebde1497c889afc85ebf04274 [2020-07-20 16:56:44,687 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:56:44,690 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:56:44,691 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:44,692 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:56:44,695 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:56:44,696 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,699 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40692b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44, skipping insertion in model container [2020-07-20 16:56:44,699 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,707 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:56:44,725 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:56:44,910 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:44,914 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:56:44,929 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:44,945 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:56:44,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44 WrapperNode [2020-07-20 16:56:44,945 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:44,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:56:44,946 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:56:44,947 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:56:44,961 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,961 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,967 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,967 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,971 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,973 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,973 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... [2020-07-20 16:56:44,975 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:56:44,976 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:56:44,976 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:56:44,976 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:56:44,977 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:45,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:56:45,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:56:45,129 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 16:56:45,129 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:56:45,129 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:56:45,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:56:45,130 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 16:56:45,131 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:56:45,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:56:45,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:56:45,326 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:56:45,326 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:56:45,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:45 BoogieIcfgContainer [2020-07-20 16:56:45,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:56:45,332 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:56:45,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:56:45,335 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:56:45,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:56:44" (1/3) ... [2020-07-20 16:56:45,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d21b555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:45, skipping insertion in model container [2020-07-20 16:56:45,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:44" (2/3) ... [2020-07-20 16:56:45,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d21b555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:45, skipping insertion in model container [2020-07-20 16:56:45,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:45" (3/3) ... [2020-07-20 16:56:45,339 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i10_o10-1.c [2020-07-20 16:56:45,347 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:56:45,355 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:56:45,370 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:56:45,395 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:56:45,395 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:56:45,395 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:56:45,396 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:56:45,396 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:56:45,396 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:56:45,396 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:56:45,396 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:56:45,415 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 16:56:45,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:56:45,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:45,424 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:45,424 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:45,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:45,429 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 16:56:45,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:45,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735322925] [2020-07-20 16:56:45,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:45,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:45,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:45,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:45,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:45,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:56:45,665 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:45,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735322925] [2020-07-20 16:56:45,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:45,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:45,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732570641] [2020-07-20 16:56:45,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:45,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:45,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:45,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:45,687 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 16:56:45,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:45,762 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 16:56:45,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:45,764 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:56:45,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:45,775 INFO L225 Difference]: With dead ends: 30 [2020-07-20 16:56:45,775 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 16:56:45,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:56:45,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 16:56:45,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 16:56:45,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 16:56:45,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 16:56:45,867 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 16:56:45,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:45,867 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 16:56:45,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:45,868 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 16:56:45,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:56:45,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:45,872 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:46,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,087 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:46,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:46,088 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 16:56:46,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:46,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092645012] [2020-07-20 16:56:46,090 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:46,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:46,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:46,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:46,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:56:46,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:46,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,413 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:46,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092645012] [2020-07-20 16:56:46,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:46,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:56:46,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595964878] [2020-07-20 16:56:46,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:56:46,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:46,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:56:46,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:56:46,418 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 16:56:46,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:46,482 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 16:56:46,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:56:46,483 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 16:56:46,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:46,484 INFO L225 Difference]: With dead ends: 25 [2020-07-20 16:56:46,484 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:56:46,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:46,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:56:46,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:56:46,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:56:46,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 16:56:46,493 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 16:56:46,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:46,494 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 16:56:46,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:56:46,494 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 16:56:46,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 16:56:46,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:46,496 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:46,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,709 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:46,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:46,709 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-20 16:56:46,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:46,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576944032] [2020-07-20 16:56:46,712 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,746 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:46,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:46,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:46,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:46,796 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 16:56:46,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:47,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,154 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:56:47,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576944032] [2020-07-20 16:56:47,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:47,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:56:47,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280338019] [2020-07-20 16:56:47,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:56:47,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:47,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:56:47,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:56:47,158 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 16:56:47,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:47,222 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 16:56:47,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:47,223 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 16:56:47,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:47,224 INFO L225 Difference]: With dead ends: 28 [2020-07-20 16:56:47,224 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:56:47,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:47,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:56:47,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:56:47,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:56:47,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 16:56:47,232 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 16:56:47,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:47,233 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 16:56:47,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:56:47,233 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 16:56:47,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:56:47,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:47,234 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:47,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:47,436 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:47,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:47,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-20 16:56:47,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:47,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847020840] [2020-07-20 16:56:47,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:47,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:47,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:47,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:47,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:47,561 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 16:56:47,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:47,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,139 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:56:48,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847020840] [2020-07-20 16:56:48,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:48,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:56:48,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526868220] [2020-07-20 16:56:48,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:56:48,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:48,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:56:48,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:56:48,143 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 16:56:48,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:48,239 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 16:56:48,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:48,242 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 16:56:48,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:48,243 INFO L225 Difference]: With dead ends: 31 [2020-07-20 16:56:48,243 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 16:56:48,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:48,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 16:56:48,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 16:56:48,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 16:56:48,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 16:56:48,251 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 16:56:48,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:48,252 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 16:56:48,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:56:48,252 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 16:56:48,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 16:56:48,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:48,253 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:48,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:48,467 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:48,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:48,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-20 16:56:48,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:48,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350584583] [2020-07-20 16:56:48,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:48,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:48,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:48,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:48,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:48,591 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:56:48,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:49,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,467 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 16:56:49,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350584583] [2020-07-20 16:56:49,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:49,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 16:56:49,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703868046] [2020-07-20 16:56:49,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:56:49,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:49,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:56:49,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:49,474 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-20 16:56:49,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:49,586 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 16:56:49,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:49,587 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 16:56:49,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:49,589 INFO L225 Difference]: With dead ends: 34 [2020-07-20 16:56:49,589 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:56:49,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:56:49,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:56:49,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:56:49,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:56:49,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 16:56:49,596 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 16:56:49,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:49,602 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 16:56:49,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:56:49,602 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 16:56:49,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 16:56:49,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:49,603 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:49,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:49,812 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:49,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:49,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-20 16:56:49,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:49,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725378183] [2020-07-20 16:56:49,815 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:49,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:49,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:49,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:49,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:49,953 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:56:49,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:50,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:50,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:50,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,300 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 16:56:51,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725378183] [2020-07-20 16:56:51,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:51,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 16:56:51,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543780262] [2020-07-20 16:56:51,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:51,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:51,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:51,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:51,303 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-20 16:56:51,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:51,438 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-20 16:56:51,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:51,439 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 16:56:51,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:51,441 INFO L225 Difference]: With dead ends: 37 [2020-07-20 16:56:51,441 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:56:51,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:51,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:56:51,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 16:56:51,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 16:56:51,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 16:56:51,448 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-20 16:56:51,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:51,449 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 16:56:51,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:51,449 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 16:56:51,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 16:56:51,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:51,450 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:51,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:51,665 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:51,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:51,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-20 16:56:51,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:51,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602081672] [2020-07-20 16:56:51,668 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 [2020-07-20 16:56:51,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:51,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:51,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:51,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:51,802 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 16:56:51,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:52,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,732 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:56:53,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602081672] [2020-07-20 16:56:53,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:53,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 16:56:53,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36827741] [2020-07-20 16:56:53,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:53,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:53,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:53,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:53,736 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-20 16:56:53,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:53,911 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-20 16:56:53,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:56:53,912 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-20 16:56:53,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:53,914 INFO L225 Difference]: With dead ends: 40 [2020-07-20 16:56:53,914 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 16:56:53,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:56:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 16:56:53,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 16:56:53,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:56:53,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 16:56:53,929 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-20 16:56:53,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:53,933 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 16:56:53,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:53,933 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 16:56:53,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 16:56:53,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:53,934 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:54,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:54,154 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:54,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:54,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-20 16:56:54,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:54,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489130316] [2020-07-20 16:56:54,156 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 [2020-07-20 16:56:54,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:54,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:54,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:54,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:54,342 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 16:56:54,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:55,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:55,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,151 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 16:56:57,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489130316] [2020-07-20 16:56:57,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:57,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 16:56:57,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16865890] [2020-07-20 16:56:57,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:57,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:57,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:57,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:57,154 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-20 16:56:57,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:57,343 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-20 16:56:57,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:56:57,343 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-20 16:56:57,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:57,345 INFO L225 Difference]: With dead ends: 43 [2020-07-20 16:56:57,345 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 16:56:57,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:56:57,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 16:56:57,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 16:56:57,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 16:56:57,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 16:56:57,352 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-20 16:56:57,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:57,353 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 16:56:57,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:57,353 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 16:56:57,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 16:56:57,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:57,355 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:57,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:57,558 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:57,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:57,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-20 16:56:57,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:57,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290261087] [2020-07-20 16:56:57,561 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 [2020-07-20 16:56:57,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:57,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:57,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:57,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:57,770 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:56:57,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:59,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,852 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:57:01,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290261087] [2020-07-20 16:57:01,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:01,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 16:57:01,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309663397] [2020-07-20 16:57:01,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:57:01,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:01,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:57:01,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:01,856 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-20 16:57:02,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:02,036 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-20 16:57:02,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:57:02,037 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-20 16:57:02,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:02,038 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:57:02,038 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:57:02,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 16:57:02,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:57:02,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 16:57:02,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 16:57:02,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-20 16:57:02,050 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-20 16:57:02,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:02,050 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-20 16:57:02,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:57:02,051 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-20 16:57:02,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:57:02,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:02,052 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:02,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:02,267 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:02,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:02,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-20 16:57:02,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:02,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479684189] [2020-07-20 16:57:02,270 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 [2020-07-20 16:57:02,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:02,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:02,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:57:02,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:02,510 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-20 16:57:02,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:05,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:07,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,180 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 16:57:08,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479684189] [2020-07-20 16:57:08,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:08,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 16:57:08,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769620844] [2020-07-20 16:57:08,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:57:08,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:08,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:57:08,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:57:08,183 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-20 16:57:08,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:08,391 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-20 16:57:08,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:57:08,392 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-20 16:57:08,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:08,394 INFO L225 Difference]: With dead ends: 49 [2020-07-20 16:57:08,394 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 16:57:08,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 16:57:08,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 16:57:08,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-20 16:57:08,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 16:57:08,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 16:57:08,402 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-20 16:57:08,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:08,403 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 16:57:08,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:57:08,403 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 16:57:08,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 16:57:08,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:08,405 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:08,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:08,618 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:08,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:08,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-20 16:57:08,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:08,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403476942] [2020-07-20 16:57:08,621 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 [2020-07-20 16:57:08,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:57:08,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:57:08,805 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:57:08,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:57:08,823 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:57:08,843 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:57:08,844 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:57:09,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:09,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:57:09 BoogieIcfgContainer [2020-07-20 16:57:09,088 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:57:09,090 INFO L168 Benchmark]: Toolchain (without parser) took 24401.41 ms. Allocated memory was 137.9 MB in the beginning and 402.7 MB in the end (delta: 264.8 MB). Free memory was 102.9 MB in the beginning and 296.7 MB in the end (delta: -193.8 MB). Peak memory consumption was 71.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,091 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,092 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.52 ms. Allocated memory is still 137.9 MB. Free memory was 102.5 MB in the beginning and 93.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,092 INFO L168 Benchmark]: Boogie Preprocessor took 28.69 ms. Allocated memory is still 137.9 MB. Free memory was 93.3 MB in the beginning and 92.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,093 INFO L168 Benchmark]: RCFGBuilder took 354.97 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 92.0 MB in the beginning and 170.2 MB in the end (delta: -78.2 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,094 INFO L168 Benchmark]: TraceAbstraction took 23756.38 ms. Allocated memory was 201.9 MB in the beginning and 402.7 MB in the end (delta: 200.8 MB). Free memory was 169.5 MB in the beginning and 296.7 MB in the end (delta: -127.2 MB). Peak memory consumption was 73.6 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:09,098 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 254.52 ms. Allocated memory is still 137.9 MB. Free memory was 102.5 MB in the beginning and 93.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.69 ms. Allocated memory is still 137.9 MB. Free memory was 93.3 MB in the beginning and 92.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 354.97 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 92.0 MB in the beginning and 170.2 MB in the end (delta: -78.2 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 23756.38 ms. Allocated memory was 201.9 MB in the beginning and 402.7 MB in the end (delta: 200.8 MB). Free memory was 169.5 MB in the beginning and 296.7 MB in the end (delta: -127.2 MB). Peak memory consumption was 73.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 10; VAL [input=10] [L11] CALL, EXPR id(input) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=10, input=10] [L11] int result = id(input); [L12] COND TRUE result == 10 VAL [input=10, result=10] [L13] __VERIFIER_error() VAL [input=10, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 23.6s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 134 SDtfs, 510 SDslu, 768 SDs, 0 SdLazy, 392 SolverSat, 197 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 832 GetRequests, 531 SyntacticMatches, 109 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 18.7s InterpolantComputationTime, 473 NumberOfCodeBlocks, 388 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 106872 SizeOfPredicates, 65 NumberOfNonLiveVariables, 856 ConjunctsInSsa, 130 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 615/1800 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...