/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:50:50,739 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:50:50,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:50:50,764 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:50:50,765 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:50:50,767 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:50:50,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:50:50,778 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:50:50,786 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:50:50,787 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:50:50,789 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:50:50,790 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:50:50,790 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:50:50,792 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:50:50,793 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:50:50,797 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:50:50,798 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:50:50,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:50:50,803 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:50:50,807 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:50:50,813 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:50:50,817 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:50:50,819 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:50:50,820 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:50:50,825 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:50:50,844 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 00:50:50,864 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:50:50,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:50:50,866 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:50:50,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:50:50,867 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:50:50,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:50:50,867 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:50:50,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:50:50,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:50:50,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:50:50,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:50:50,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:50:50,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:50:50,869 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:50:50,869 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:50:50,869 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:50:50,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:50:50,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:50:50,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:50:50,870 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:50:50,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:50:50,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:50:50,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:50:50,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:50:50,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:50:50,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:50:50,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:50,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:50:50,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:50:50,872 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 00:50:51,223 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:50:51,238 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:50:51,242 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:50:51,244 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:50:51,245 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:50:51,246 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 00:50:51,324 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e43c962f/99afb6b09b6246308600fb6b61f0c287/FLAG5cef35e6b [2020-07-21 00:50:51,786 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:50:51,788 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 00:50:51,795 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e43c962f/99afb6b09b6246308600fb6b61f0c287/FLAG5cef35e6b [2020-07-21 00:50:52,206 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e43c962f/99afb6b09b6246308600fb6b61f0c287 [2020-07-21 00:50:52,217 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:50:52,220 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:50:52,221 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:50:52,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:50:52,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:50:52,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,230 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e2ff478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52, skipping insertion in model container [2020-07-21 00:50:52,230 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,238 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:50:52,255 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:50:52,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:50:52,431 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:50:52,448 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:50:52,463 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:50:52,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52 WrapperNode [2020-07-21 00:50:52,464 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:50:52,465 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:50:52,465 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:50:52,466 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:50:52,480 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,490 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,490 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,494 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,497 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,498 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... [2020-07-21 00:50:52,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:50:52,500 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:50:52,500 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:50:52,500 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:50:52,501 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:50:52,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:50:52,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:50:52,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:50:52,666 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:50:52,666 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:50:52,666 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:50:52,666 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:50:52,666 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:50:52,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:50:52,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:50:52,868 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:50:52,868 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:50:52,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:50:52 BoogieIcfgContainer [2020-07-21 00:50:52,874 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:50:52,875 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:50:52,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:50:52,880 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:50:52,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:50:52" (1/3) ... [2020-07-21 00:50:52,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a388d66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:50:52, skipping insertion in model container [2020-07-21 00:50:52,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:50:52" (2/3) ... [2020-07-21 00:50:52,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a388d66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:50:52, skipping insertion in model container [2020-07-21 00:50:52,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:50:52" (3/3) ... [2020-07-21 00:50:52,885 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-2.c [2020-07-21 00:50:52,897 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:50:52,911 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:50:52,929 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:50:52,962 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:50:52,962 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:50:52,963 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:50:52,963 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:50:52,964 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:50:52,964 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:50:52,964 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:50:52,964 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:50:52,988 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:50:52,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:50:52,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:52,999 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:53,000 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:53,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:53,009 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:50:53,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:53,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2099668391] [2020-07-21 00:50:53,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:53,099 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:53,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:53,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:50:53,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:53,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:50:53,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:50:53,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2099668391] [2020-07-21 00:50:53,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:50:53,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:50:53,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054113385] [2020-07-21 00:50:53,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:50:53,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:53,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:50:53,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:50:53,309 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:50:53,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:53,451 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:50:53,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:50:53,453 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:50:53,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:53,467 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:50:53,467 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:50:53,471 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 [2020-07-21 00:50:53,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:50:53,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:50:53,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:50:53,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:50:53,529 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:50:53,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:53,530 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:50:53,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:50:53,530 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:50:53,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:50:53,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:53,533 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:53,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:53,749 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:53,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:53,751 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:50:53,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:53,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447551470] [2020-07-21 00:50:53,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:53,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:50:53,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:53,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:50:53,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:50:53,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:50:53,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447551470] [2020-07-21 00:50:53,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:50:53,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:50:53,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675927021] [2020-07-21 00:50:53,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:50:53,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:53,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:50:53,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:50:53,825 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:50:53,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:53,933 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:50:53,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:50:53,935 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:50:53,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:53,937 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:50:53,938 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:50:53,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:50:53,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:50:53,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:50:53,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:50:53,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:50:53,967 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:50:53,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:53,968 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:50:53,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:50:53,969 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:50:53,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:50:53,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:53,976 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:54,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:54,191 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:54,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:54,193 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:50:54,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:54,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278126625] [2020-07-21 00:50:54,195 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:54,226 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:54,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:54,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:50:54,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:54,290 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:50:54,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:54,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:54,556 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:50:54,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278126625] [2020-07-21 00:50:54,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:54,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:50:54,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290230155] [2020-07-21 00:50:54,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:50:54,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:54,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:50:54,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:50:54,560 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:50:54,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:54,684 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:50:54,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:50:54,685 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:50:54,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:54,687 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:50:54,687 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:50:54,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:54,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:50:54,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:50:54,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:50:54,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:50:54,698 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:50:54,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:54,698 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:50:54,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:50:54,699 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:50:54,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:50:54,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:54,700 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:54,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:54,915 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:54,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:54,915 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:50:54,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:54,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350584583] [2020-07-21 00:50:54,917 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:54,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:54,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:54,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:50:54,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:55,013 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:50:55,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:55,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:55,200 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:50:55,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350584583] [2020-07-21 00:50:55,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:55,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:50:55,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724184569] [2020-07-21 00:50:55,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:50:55,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:55,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:50:55,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:50:55,203 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:50:55,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:55,291 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:50:55,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:50:55,292 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:50:55,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:55,295 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:50:55,295 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:50:55,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:55,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:50:55,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:50:55,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:50:55,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:50:55,306 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:50:55,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:55,306 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:50:55,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:50:55,307 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:50:55,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:50:55,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:55,309 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:55,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:55,524 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:55,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:55,525 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:50:55,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:55,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636801586] [2020-07-21 00:50:55,526 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:55,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:55,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:55,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:50:55,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 00:50:55,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:55,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:55,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:55,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:55,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:55,961 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:50:55,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636801586] [2020-07-21 00:50:55,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:55,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:50:55,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657127644] [2020-07-21 00:50:55,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:50:55,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:55,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:50:55,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:55,965 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:50:56,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:56,122 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:50:56,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:50:56,123 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:50:56,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:56,126 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:50:56,126 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:50:56,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:50:56,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:50:56,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:50:56,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:50:56,140 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:50:56,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:56,140 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:50:56,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:50:56,141 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:50:56,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:50:56,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:56,143 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:56,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:56,358 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:56,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:56,358 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:50:56,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:56,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213807195] [2020-07-21 00:50:56,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:56,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:56,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:56,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:50:56,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:56,434 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 00:50:56,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:56,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:56,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:56,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:56,779 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:50:56,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213807195] [2020-07-21 00:50:56,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:56,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:50:56,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378496945] [2020-07-21 00:50:56,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:50:56,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:56,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:50:56,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:50:56,783 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:50:56,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:56,924 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:50:56,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:50:56,925 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:50:56,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:56,928 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:50:56,928 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:50:56,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:50:56,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:50:56,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:50:56,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:50:56,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:50:56,941 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:50:56,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:56,942 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:50:56,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:50:56,942 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:50:56,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:50:56,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:56,945 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:57,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:57,158 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:57,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:57,159 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:50:57,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:57,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44954153] [2020-07-21 00:50:57,160 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:57,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:50:57,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:57,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:50:57,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:57,264 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 00:50:57,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:57,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:57,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:57,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:57,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:57,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:57,967 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 00:50:57,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44954153] [2020-07-21 00:50:57,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:57,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:50:57,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911456555] [2020-07-21 00:50:57,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:50:57,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:57,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:50:57,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:50:57,974 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:50:58,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:58,190 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:50:58,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:50:58,191 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:50:58,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:58,197 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:50:58,197 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:50:58,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:50:58,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:50:58,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:50:58,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:50:58,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:50:58,234 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:50:58,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:58,238 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:50:58,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:50:58,240 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:50:58,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:50:58,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:58,248 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:58,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:58,462 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:58,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:58,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:50:58,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:58,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877810912] [2020-07-21 00:50:58,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:58,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:50:58,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:58,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:50:58,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:58,589 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 00:50:58,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:59,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:50:59,284 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 00:50:59,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877810912] [2020-07-21 00:50:59,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:50:59,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:50:59,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205476653] [2020-07-21 00:50:59,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:50:59,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:50:59,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:50:59,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:50:59,293 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 00:50:59,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:50:59,450 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:50:59,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:50:59,454 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 00:50:59,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:50:59,460 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:50:59,460 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:50:59,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:50:59,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:50:59,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:50:59,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:50:59,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:50:59,476 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:50:59,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:50:59,477 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:50:59,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:50:59,477 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:50:59,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:50:59,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:50:59,480 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:50:59,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:59,696 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:50:59,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:50:59,698 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:50:59,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:50:59,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500206991] [2020-07-21 00:50:59,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:50:59,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:50:59,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:50:59,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:50:59,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:50:59,878 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 00:50:59,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:00,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:00,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:00,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:00,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:00,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:00,936 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:51:00,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500206991] [2020-07-21 00:51:00,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:00,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:51:00,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788843039] [2020-07-21 00:51:00,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:51:00,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:00,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:51:00,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:51:00,939 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 00:51:01,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:01,247 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:51:01,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:51:01,247 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 00:51:01,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:01,250 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:51:01,250 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:51:01,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:51:01,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:51:01,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:51:01,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:51:01,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:51:01,265 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:51:01,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:01,266 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:51:01,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:51:01,266 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:51:01,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:51:01,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:01,269 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:01,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:01,483 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:01,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:01,484 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:51:01,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:01,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89161700] [2020-07-21 00:51:01,484 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:01,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:01,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:01,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:51:01,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:01,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 00:51:01,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:02,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:02,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 00:51:02,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89161700] [2020-07-21 00:51:02,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:02,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:51:02,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741032032] [2020-07-21 00:51:02,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:51:02,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:02,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:51:02,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:51:02,835 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 00:51:03,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:03,020 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 00:51:03,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:51:03,021 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 00:51:03,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:03,025 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:51:03,025 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 00:51:03,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:51:03,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 00:51:03,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 00:51:03,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:51:03,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:51:03,039 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 00:51:03,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:03,040 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:51:03,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:51:03,040 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:51:03,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:51:03,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:03,045 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:03,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:03,262 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:03,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:03,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 00:51:03,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:03,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699564698] [2020-07-21 00:51:03,264 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:03,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:03,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:03,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:51:03,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:03,481 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 00:51:03,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:04,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:05,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 00:51:05,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699564698] [2020-07-21 00:51:05,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:05,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:51:05,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072688537] [2020-07-21 00:51:05,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:51:05,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:05,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:51:05,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:51:05,493 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 00:51:05,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:05,726 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 00:51:05,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:51:05,727 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 00:51:05,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:05,729 INFO L225 Difference]: With dead ends: 72 [2020-07-21 00:51:05,730 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:51:05,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:51:05,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:51:05,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 00:51:05,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:51:05,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:51:05,744 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 00:51:05,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:05,745 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:51:05,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:51:05,746 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:51:05,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 00:51:05,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:05,751 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:05,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:05,967 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:05,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:05,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 00:51:05,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:05,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134811875] [2020-07-21 00:51:05,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:06,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:06,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:06,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:51:06,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:06,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 00:51:06,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:07,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:07,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:08,372 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 00:51:08,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134811875] [2020-07-21 00:51:08,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:08,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 00:51:08,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875156487] [2020-07-21 00:51:08,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 00:51:08,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:08,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 00:51:08,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:51:08,377 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-21 00:51:08,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:08,650 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 00:51:08,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:51:08,650 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 300 [2020-07-21 00:51:08,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:08,660 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:51:08,661 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 00:51:08,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 00:51:08,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 00:51:08,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 00:51:08,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:51:08,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:51:08,693 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 00:51:08,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:08,694 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:51:08,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 00:51:08,694 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:51:08,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-21 00:51:08,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:08,704 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 26, 25, 25, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:08,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:08,918 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:08,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:08,919 INFO L82 PathProgramCache]: Analyzing trace with hash -2028798950, now seen corresponding path program 6 times [2020-07-21 00:51:08,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:08,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301468659] [2020-07-21 00:51:08,920 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:09,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:09,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:09,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:51:09,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 256 proven. 1325 refuted. 0 times theorem prover too weak. 5019 trivial. 0 not checked. [2020-07-21 00:51:09,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:10,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:11,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:11,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:11,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:11,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:12,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:12,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:12,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:12,259 INFO L134 CoverageAnalysis]: Checked inductivity of 6600 backedges. 256 proven. 1376 refuted. 0 times theorem prover too weak. 4968 trivial. 0 not checked. [2020-07-21 00:51:12,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301468659] [2020-07-21 00:51:12,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:12,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 00:51:12,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144258107] [2020-07-21 00:51:12,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 00:51:12,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:12,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 00:51:12,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:51:12,263 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-21 00:51:12,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:12,553 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 00:51:12,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:51:12,554 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 338 [2020-07-21 00:51:12,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:12,559 INFO L225 Difference]: With dead ends: 82 [2020-07-21 00:51:12,559 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:51:12,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 645 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:51:12,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:51:12,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 00:51:12,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:51:12,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:51:12,576 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 338 [2020-07-21 00:51:12,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:12,578 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:51:12,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 00:51:12,578 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:51:12,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 00:51:12,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:12,583 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 52, 32, 32, 32, 32, 32, 32, 32, 20, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:12,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:12,798 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:12,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:12,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1773208677, now seen corresponding path program 6 times [2020-07-21 00:51:12,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:12,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439630492] [2020-07-21 00:51:12,800 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:12,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:12,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:12,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:51:12,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:13,184 INFO L134 CoverageAnalysis]: Checked inductivity of 11630 backedges. 648 proven. 1702 refuted. 0 times theorem prover too weak. 9280 trivial. 0 not checked. [2020-07-21 00:51:13,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:15,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:15,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:15,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:15,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 11630 backedges. 652 proven. 1749 refuted. 0 times theorem prover too weak. 9229 trivial. 0 not checked. [2020-07-21 00:51:16,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439630492] [2020-07-21 00:51:16,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:16,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 00:51:16,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83754307] [2020-07-21 00:51:16,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 00:51:16,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:16,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 00:51:16,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 00:51:16,653 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-21 00:51:17,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:17,008 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-21 00:51:17,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:51:17,009 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 449 [2020-07-21 00:51:17,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:17,012 INFO L225 Difference]: With dead ends: 147 [2020-07-21 00:51:17,012 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 00:51:17,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 866 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:51:17,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 00:51:17,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 00:51:17,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 00:51:17,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-21 00:51:17,050 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 449 [2020-07-21 00:51:17,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:17,054 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-21 00:51:17,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 00:51:17,055 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-21 00:51:17,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 00:51:17,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:17,060 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 36, 20, 20, 20, 20, 20, 20, 20, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:17,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:17,275 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:17,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:17,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1606827399, now seen corresponding path program 7 times [2020-07-21 00:51:17,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:17,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625422847] [2020-07-21 00:51:17,277 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:17,454 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:51:17,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:17,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:51:17,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:17,668 INFO L134 CoverageAnalysis]: Checked inductivity of 4670 backedges. 303 proven. 870 refuted. 0 times theorem prover too weak. 3497 trivial. 0 not checked. [2020-07-21 00:51:17,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:18,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:18,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:19,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4670 backedges. 315 proven. 895 refuted. 0 times theorem prover too weak. 3460 trivial. 0 not checked. [2020-07-21 00:51:19,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625422847] [2020-07-21 00:51:19,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:19,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 00:51:19,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712676797] [2020-07-21 00:51:19,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 00:51:19,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:19,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 00:51:19,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 00:51:19,712 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 16 states. [2020-07-21 00:51:20,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:20,003 INFO L93 Difference]: Finished difference Result 165 states and 347 transitions. [2020-07-21 00:51:20,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:51:20,004 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 289 [2020-07-21 00:51:20,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:20,008 INFO L225 Difference]: With dead ends: 165 [2020-07-21 00:51:20,008 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:51:20,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 550 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 00:51:20,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:51:20,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 67. [2020-07-21 00:51:20,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 00:51:20,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 99 transitions. [2020-07-21 00:51:20,025 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 99 transitions. Word has length 289 [2020-07-21 00:51:20,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:20,026 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 99 transitions. [2020-07-21 00:51:20,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 00:51:20,026 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 99 transitions. [2020-07-21 00:51:20,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:51:20,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:20,030 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:20,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:20,246 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:20,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:20,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-21 00:51:20,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:20,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330864612] [2020-07-21 00:51:20,247 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:20,461 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:20,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:51:20,462 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:51:20,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:51:20,525 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:51:20,589 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:51:20,589 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:51:20,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:20,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:51:20 BoogieIcfgContainer [2020-07-21 00:51:20,883 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:51:20,887 INFO L168 Benchmark]: Toolchain (without parser) took 28667.10 ms. Allocated memory was 144.2 MB in the beginning and 548.9 MB in the end (delta: 404.8 MB). Free memory was 101.8 MB in the beginning and 377.4 MB in the end (delta: -275.7 MB). Peak memory consumption was 129.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,887 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,888 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.25 ms. Allocated memory is still 144.2 MB. Free memory was 101.3 MB in the beginning and 92.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,889 INFO L168 Benchmark]: Boogie Preprocessor took 34.32 ms. Allocated memory is still 144.2 MB. Free memory was 92.2 MB in the beginning and 90.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,890 INFO L168 Benchmark]: RCFGBuilder took 373.88 ms. Allocated memory was 144.2 MB in the beginning and 202.4 MB in the end (delta: 58.2 MB). Free memory was 90.6 MB in the beginning and 169.9 MB in the end (delta: -79.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,891 INFO L168 Benchmark]: TraceAbstraction took 28008.12 ms. Allocated memory was 202.4 MB in the beginning and 548.9 MB in the end (delta: 346.6 MB). Free memory was 169.2 MB in the beginning and 377.4 MB in the end (delta: -208.3 MB). Peak memory consumption was 138.3 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:20,894 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 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.25 ms. Allocated memory is still 144.2 MB. Free memory was 101.3 MB in the beginning and 92.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.32 ms. Allocated memory is still 144.2 MB. Free memory was 92.2 MB in the beginning and 90.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 373.88 ms. Allocated memory was 144.2 MB in the beginning and 202.4 MB in the end (delta: 58.2 MB). Free memory was 90.6 MB in the beginning and 169.9 MB in the end (delta: -79.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 28008.12 ms. Allocated memory was 202.4 MB in the beginning and 548.9 MB in the end (delta: 346.6 MB). Free memory was 169.2 MB in the beginning and 377.4 MB in the end (delta: -208.3 MB). Peak memory consumption was 138.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 7; VAL [x=7] [L25] CALL, EXPR fibo(x) VAL [\old(n)=7] [L6] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L8] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=6] [L6] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L8] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=6, fibo(n-1)=5, n=6] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=6, fibo(n-1)=5, fibo(n-2)=3, n=6] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=7, fibo(n-1)=8, n=7] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=7, fibo(n-1)=8, fibo(n-2)=5, n=7] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=13, x=7] [L25] int result = fibo(x); [L26] COND TRUE result == 13 VAL [result=13, x=7] [L27] __VERIFIER_error() VAL [result=13, x=7] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 27.8s, OverallIterations: 16, TraceHistogramMax: 65, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 266 SDtfs, 516 SDslu, 1099 SDs, 0 SdLazy, 1270 SolverSat, 738 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4611 GetRequests, 4264 SyntacticMatches, 124 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=14, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 15 MinimizatonAttempts, 185 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 19.2s InterpolantComputationTime, 2576 NumberOfCodeBlocks, 930 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 4525 ConstructedInterpolants, 0 QuantifiedInterpolants, 1820863 SizeOfPredicates, 77 NumberOfNonLiveVariables, 1445 ConjunctsInSsa, 154 ConjunctsInUnsatCore, 28 InterpolantComputations, 2 PerfectInterpolantSequences, 57638/71880 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...