/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:26:54,091 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:26:54,095 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:26:54,115 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:26:54,116 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:26:54,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:26:54,121 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:26:54,131 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:26:54,137 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:26:54,139 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:26:54,141 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:26:54,143 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:26:54,143 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:26:54,145 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:26:54,147 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:26:54,148 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:26:54,150 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:26:54,151 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:26:54,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:26:54,158 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:26:54,163 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:26:54,167 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:26:54,168 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:26:54,169 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:26:54,171 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:26:54,186 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:26:54,226 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:26:54,226 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:26:54,230 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:26:54,230 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:26:54,230 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:26:54,231 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:26:54,231 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:26:54,231 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:26:54,233 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:26:54,233 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:26:54,234 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:26:54,234 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:26:54,234 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:26:54,234 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:26:54,234 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:26:54,235 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:26:54,235 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:26:54,235 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:26:54,235 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:26:54,235 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:26:54,236 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:26:54,236 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:26:54,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:26:54,238 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:26:54,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:26:54,238 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:26:54,239 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:54,239 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:26:54,239 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:26:54,239 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:26:54,534 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:26:54,549 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:26:54,553 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:26:54,555 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:26:54,555 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:26:54,556 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 22:26:54,646 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8838366c/1a4be4b9e3d74a12a973a887c719882e/FLAG83782e6a2 [2020-07-21 22:26:55,252 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:26:55,253 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-21 22:26:55,269 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8838366c/1a4be4b9e3d74a12a973a887c719882e/FLAG83782e6a2 [2020-07-21 22:26:55,566 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8838366c/1a4be4b9e3d74a12a973a887c719882e [2020-07-21 22:26:55,578 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:26:55,581 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:26:55,583 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:26:55,583 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:26:55,591 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:26:55,593 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b0a335d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55, skipping insertion in model container [2020-07-21 22:26:55,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,608 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:26:55,633 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:26:55,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:26:55,841 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:26:55,865 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:26:55,889 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:26:55,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55 WrapperNode [2020-07-21 22:26:55,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:26:55,892 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:26:55,893 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:26:55,893 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:26:55,909 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,910 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,919 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,924 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,927 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,928 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... [2020-07-21 22:26:55,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:26:55,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:26:55,932 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:26:55,933 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:26:55,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:26:56,160 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:26:56,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:26:56,161 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 22:26:56,161 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:26:56,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 22:26:56,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:26:56,162 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 22:26:56,162 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:26:56,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:26:56,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:26:56,406 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:26:56,406 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:26:56,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:26:56 BoogieIcfgContainer [2020-07-21 22:26:56,412 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:26:56,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:26:56,415 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:26:56,419 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:26:56,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:26:55" (1/3) ... [2020-07-21 22:26:56,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a8d6d8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:26:56, skipping insertion in model container [2020-07-21 22:26:56,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:26:55" (2/3) ... [2020-07-21 22:26:56,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a8d6d8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:26:56, skipping insertion in model container [2020-07-21 22:26:56,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:26:56" (3/3) ... [2020-07-21 22:26:56,425 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-21 22:26:56,439 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:26:56,450 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:26:56,468 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:26:56,507 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:26:56,508 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:26:56,508 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:26:56,508 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:26:56,509 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:26:56,509 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:26:56,509 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:26:56,509 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:26:56,532 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 22:26:56,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:26:56,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:26:56,543 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:26:56,544 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:26:56,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:26:56,554 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 22:26:56,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:26:56,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785012819] [2020-07-21 22:26:56,568 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:56,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:26:56,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:26:56,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:26:56,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:26:56,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:26:56,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:26:56,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785012819] [2020-07-21 22:26:56,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:26:56,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:26:56,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245787742] [2020-07-21 22:26:56,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:26:56,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:26:56,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:26:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:26:56,959 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 22:26:57,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:26:57,050 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 22:26:57,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:26:57,054 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:26:57,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:26:57,073 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:26:57,073 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 22:26:57,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:26:57,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 22:26:57,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 22:26:57,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 22:26:57,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 22:26:57,156 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 22:26:57,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:26:57,157 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 22:26:57,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:26:57,158 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 22:26:57,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:26:57,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:26:57,162 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:26:57,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:57,379 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:26:57,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:26:57,380 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 22:26:57,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:26:57,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026500177] [2020-07-21 22:26:57,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:57,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:26:57,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:26:57,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:26:57,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:26:57,516 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:26:57,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:26:57,931 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:26:57,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026500177] [2020-07-21 22:26:57,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:26:57,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 22:26:57,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204509334] [2020-07-21 22:26:57,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:26:57,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:26:57,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:26:57,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:26:57,940 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 22:26:58,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:26:58,115 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 22:26:58,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:26:58,116 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 22:26:58,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:26:58,120 INFO L225 Difference]: With dead ends: 30 [2020-07-21 22:26:58,121 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:26:58,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:26:58,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:26:58,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:26:58,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:26:58,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 22:26:58,157 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 22:26:58,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:26:58,158 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 22:26:58,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:26:58,160 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 22:26:58,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:26:58,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:26:58,165 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:26:58,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:58,382 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:26:58,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:26:58,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 22:26:58,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:26:58,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194869860] [2020-07-21 22:26:58,384 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:26:58,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:26:58,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:26:58,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 22:26:58,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:26:58,636 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:26:58,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:27:01,509 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:27:01,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194869860] [2020-07-21 22:27:01,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:27:01,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 22:27:01,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448246099] [2020-07-21 22:27:01,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:27:01,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:27:01,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:27:01,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=315, Unknown=1, NotChecked=0, Total=380 [2020-07-21 22:27:01,514 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 22:27:03,546 WARN L193 SmtUtils]: Spent 1.86 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-21 22:27:05,926 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 22:27:06,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:27:06,042 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 22:27:06,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 22:27:06,048 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 22:27:06,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:27:06,051 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:27:06,052 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:27:06,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=98, Invalid=453, Unknown=1, NotChecked=0, Total=552 [2020-07-21 22:27:06,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:27:06,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 22:27:06,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:27:06,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 22:27:06,084 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 22:27:06,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:27:06,086 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 22:27:06,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:27:06,087 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 22:27:06,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:27:06,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:27:06,094 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:27:06,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:27:06,297 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:27:06,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:27:06,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 22:27:06,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:27:06,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028837948] [2020-07-21 22:27:06,299 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:27:06,367 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:27:06,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:27:06,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 22:27:06,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:27:06,716 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:27:06,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:27:11,019 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 76 refuted. 1 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:27:11,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028837948] [2020-07-21 22:27:11,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:27:11,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 22:27:11,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125430705] [2020-07-21 22:27:11,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 22:27:11,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:27:11,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 22:27:11,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1075, Unknown=1, NotChecked=0, Total=1260 [2020-07-21 22:27:11,027 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 22:27:11,937 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 22:27:12,387 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 22:27:12,835 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 22:27:15,541 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 22:27:20,530 WARN L193 SmtUtils]: Spent 2.64 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-21 22:27:23,088 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 22:27:28,125 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-21 22:27:38,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:27:38,999 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 22:27:39,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 22:27:39,003 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 22:27:39,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:27:39,006 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:27:39,006 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:27:39,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 28.9s TimeCoverageRelationStatistics Valid=380, Invalid=1869, Unknown=7, NotChecked=0, Total=2256 [2020-07-21 22:27:39,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:27:39,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 22:27:39,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 22:27:39,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 22:27:39,024 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 22:27:39,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:27:39,025 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 22:27:39,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 22:27:39,026 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 22:27:39,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 22:27:39,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:27:39,029 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:27:39,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:27:39,231 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:27:39,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:27:39,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 22:27:39,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:27:39,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465771759] [2020-07-21 22:27:39,234 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:27:43,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:27:43,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:27:43,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 22:27:43,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:27:44,362 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:27:44,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:28:16,156 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 331 refuted. 14 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:28:16,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465771759] [2020-07-21 22:28:16,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:28:16,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 22:28:16,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822741095] [2020-07-21 22:28:16,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 22:28:16,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:28:16,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 22:28:16,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3928, Unknown=12, NotChecked=0, Total=4556 [2020-07-21 22:28:16,166 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 22:28:22,139 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 22:28:26,303 WARN L193 SmtUtils]: Spent 533.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 22:28:35,803 WARN L193 SmtUtils]: Spent 2.67 s on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 22:28:40,758 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 22:28:48,733 WARN L193 SmtUtils]: Spent 575.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 22:28:57,708 WARN L193 SmtUtils]: Spent 2.62 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 22:29:06,895 WARN L193 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 22:29:16,137 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 22:29:20,940 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 22:29:26,870 WARN L193 SmtUtils]: Spent 487.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 22:29:30,389 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 22:29:36,220 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 22:29:39,040 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 22:29:48,603 WARN L193 SmtUtils]: Spent 4.41 s on a formula simplification. DAG size of input: 46 DAG size of output: 16 [2020-07-21 22:29:52,578 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 22:29:59,543 WARN L193 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 22:30:03,704 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 22:30:11,252 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 22:30:26,479 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 22:30:31,373 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-21 22:30:44,904 WARN L193 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 22:30:49,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:30:49,791 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 22:30:49,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 22:30:49,792 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 22:30:49,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:30:49,795 INFO L225 Difference]: With dead ends: 114 [2020-07-21 22:30:49,796 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:30:49,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 182.1s TimeCoverageRelationStatistics Valid=1524, Invalid=7575, Unknown=21, NotChecked=0, Total=9120 [2020-07-21 22:30:49,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:30:49,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 22:30:49,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 22:30:49,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 22:30:49,826 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 22:30:49,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:30:49,826 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 22:30:49,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 22:30:49,827 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 22:30:49,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 22:30:49,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:30:49,830 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:30:50,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:30:50,036 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:30:50,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:30:50,037 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 22:30:50,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:30:50,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566116888] [2020-07-21 22:30:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:31:54,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:31:54,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:31:54,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 22:31:54,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:31:57,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 22:31:57,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:34:01,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1406 refuted. 51 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 22:34:01,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566116888] [2020-07-21 22:34:01,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:34:01,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 22:34:01,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967840852] [2020-07-21 22:34:01,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 22:34:01,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:34:01,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 22:34:01,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14998, Unknown=46, NotChecked=0, Total=17292 [2020-07-21 22:34:01,760 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 22:35:00,252 WARN L193 SmtUtils]: Spent 6.55 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 22:35:55,470 WARN L193 SmtUtils]: Spent 5.45 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 22:36:51,374 WARN L193 SmtUtils]: Spent 4.65 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 22:37:55,897 WARN L193 SmtUtils]: Spent 7.54 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 22:38:59,333 WARN L193 SmtUtils]: Spent 4.10 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 22:39:59,491 WARN L193 SmtUtils]: Spent 3.44 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 22:40:56,765 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification. DAG size of input: 143 DAG size of output: 13