/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:46:24,317 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:46:24,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:46:24,353 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:46:24,354 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:46:24,363 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:46:24,365 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:46:24,369 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:46:24,371 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:46:24,374 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:46:24,375 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:46:24,377 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:46:24,377 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:46:24,379 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:46:24,382 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:46:24,383 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:46:24,385 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:46:24,386 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:46:24,387 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:46:24,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:46:24,397 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:46:24,398 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:46:24,399 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:46:24,400 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:46:24,412 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:46:24,429 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:46:24,431 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:46:24,432 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:46:24,433 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 06:46:24,472 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:46:24,472 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:46:24,473 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:46:24,473 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:46:24,473 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:46:24,474 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:46:24,474 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:46:24,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:46:24,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:46:24,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:46:24,475 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:46:24,476 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:46:24,476 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:46:24,476 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:46:24,476 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:46:24,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:46:24,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:46:24,477 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:46:24,477 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:46:24,477 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:46:24,477 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:46:24,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:46:24,478 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:46:24,478 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:46:24,478 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:46:24,785 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:46:24,801 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:46:24,807 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:46:24,814 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:46:24,815 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:46:24,816 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-08-19 06:46:24,881 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2950ed956/6a967ac518034731b5fef60c9aee6187/FLAGd48bc5fcc [2020-08-19 06:46:25,340 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:46:25,341 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-08-19 06:46:25,348 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2950ed956/6a967ac518034731b5fef60c9aee6187/FLAGd48bc5fcc [2020-08-19 06:46:25,762 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2950ed956/6a967ac518034731b5fef60c9aee6187 [2020-08-19 06:46:25,773 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:46:25,775 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:46:25,776 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:46:25,776 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:46:25,779 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:46:25,781 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:46:25" (1/1) ... [2020-08-19 06:46:25,783 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@157ca41e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:25, skipping insertion in model container [2020-08-19 06:46:25,784 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:46:25" (1/1) ... [2020-08-19 06:46:25,792 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:46:25,808 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:46:25,995 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:46:25,999 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:46:26,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:46:26,028 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:46:26,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26 WrapperNode [2020-08-19 06:46:26,029 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:46:26,029 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:46:26,029 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:46:26,029 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:46:26,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,039 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,125 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,126 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,130 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,132 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,133 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... [2020-08-19 06:46:26,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:46:26,135 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:46:26,135 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:46:26,135 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:46:26,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-19 06:46:26,188 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:46:26,188 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:46:26,189 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-19 06:46:26,189 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:46:26,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:46:26,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:46:26,189 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-19 06:46:26,189 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:46:26,190 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:46:26,190 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:46:26,407 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:46:26,408 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 06:46:26,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:46:26 BoogieIcfgContainer [2020-08-19 06:46:26,412 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:46:26,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:46:26,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:46:26,417 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:46:26,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:46:25" (1/3) ... [2020-08-19 06:46:26,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f074712 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:46:26, skipping insertion in model container [2020-08-19 06:46:26,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:46:26" (2/3) ... [2020-08-19 06:46:26,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f074712 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:46:26, skipping insertion in model container [2020-08-19 06:46:26,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:46:26" (3/3) ... [2020-08-19 06:46:26,421 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-08-19 06:46:26,431 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:46:26,438 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:46:26,452 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:46:26,477 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:46:26,477 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:46:26,477 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:46:26,477 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:46:26,478 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:46:26,478 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:46:26,478 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:46:26,478 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:46:26,495 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-08-19 06:46:26,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 06:46:26,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:26,501 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:46:26,501 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:26,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:26,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-08-19 06:46:26,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:26,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592052385] [2020-08-19 06:46:26,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:26,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:26,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:26,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:26,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:26,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:26,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:46:26,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592052385] [2020-08-19 06:46:26,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:46:26,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 06:46:26,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750532571] [2020-08-19 06:46:26,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:46:26,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:26,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:46:26,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:46:26,820 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-08-19 06:46:26,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:26,992 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-19 06:46:26,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:46:26,994 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-08-19 06:46:26,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:27,005 INFO L225 Difference]: With dead ends: 36 [2020-08-19 06:46:27,006 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 06:46:27,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:46:27,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 06:46:27,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 06:46:27,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 06:46:27,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-19 06:46:27,057 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-08-19 06:46:27,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:27,057 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-19 06:46:27,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:46:27,057 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-19 06:46:27,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 06:46:27,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:27,060 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] [2020-08-19 06:46:27,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:46:27,061 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:27,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:27,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-08-19 06:46:27,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:27,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338549991] [2020-08-19 06:46:27,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:27,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:27,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:27,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:27,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-19 06:46:27,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-19 06:46:27,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338549991] [2020-08-19 06:46:27,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:27,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:46:27,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508916405] [2020-08-19 06:46:27,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:46:27,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:27,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:46:27,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:46:27,255 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-08-19 06:46:27,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:27,351 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-08-19 06:46:27,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:46:27,352 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-19 06:46:27,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:27,354 INFO L225 Difference]: With dead ends: 39 [2020-08-19 06:46:27,354 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 06:46:27,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:46:27,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 06:46:27,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 06:46:27,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 06:46:27,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-08-19 06:46:27,364 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2020-08-19 06:46:27,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:27,365 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-08-19 06:46:27,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:46:27,365 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-08-19 06:46:27,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:46:27,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:27,367 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, 1] [2020-08-19 06:46:27,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:46:27,368 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:27,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:27,368 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-08-19 06:46:27,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:27,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535796303] [2020-08-19 06:46:27,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:27,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:27,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:27,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:27,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:27,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,587 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 06:46:27,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535796303] [2020-08-19 06:46:27,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:27,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:46:27,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723799021] [2020-08-19 06:46:27,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:46:27,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:27,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:46:27,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:46:27,591 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 10 states. [2020-08-19 06:46:27,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:27,777 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-08-19 06:46:27,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:46:27,778 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 06:46:27,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:27,780 INFO L225 Difference]: With dead ends: 34 [2020-08-19 06:46:27,781 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 06:46:27,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:46:27,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 06:46:27,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 06:46:27,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:46:27,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2020-08-19 06:46:27,791 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2020-08-19 06:46:27,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:27,792 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2020-08-19 06:46:27,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:46:27,792 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2020-08-19 06:46:27,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:46:27,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:27,794 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, 1] [2020-08-19 06:46:27,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:46:27,795 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:27,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:27,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1293014720, now seen corresponding path program 2 times [2020-08-19 06:46:27,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:27,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402900524] [2020-08-19 06:46:27,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:27,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:27,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:27,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:27,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:27,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:27,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:27,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:27,954 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-19 06:46:27,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402900524] [2020-08-19 06:46:27,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:27,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:46:27,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276904918] [2020-08-19 06:46:27,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:46:27,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:27,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:46:27,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:46:27,961 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 6 states. [2020-08-19 06:46:28,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:28,084 INFO L93 Difference]: Finished difference Result 54 states and 78 transitions. [2020-08-19 06:46:28,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:46:28,085 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2020-08-19 06:46:28,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:28,087 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:46:28,087 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 06:46:28,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:46:28,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 06:46:28,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 06:46:28,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 06:46:28,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2020-08-19 06:46:28,096 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 42 [2020-08-19 06:46:28,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:28,097 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2020-08-19 06:46:28,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:46:28,097 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2020-08-19 06:46:28,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 06:46:28,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:28,099 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, 1, 1] [2020-08-19 06:46:28,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:46:28,100 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:28,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:28,101 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 3 times [2020-08-19 06:46:28,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:28,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816574473] [2020-08-19 06:46:28,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:28,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:28,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:28,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:28,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:28,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-19 06:46:28,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816574473] [2020-08-19 06:46:28,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:28,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:46:28,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603485499] [2020-08-19 06:46:28,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:46:28,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:28,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:46:28,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:46:28,225 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand 7 states. [2020-08-19 06:46:28,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:28,328 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2020-08-19 06:46:28,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:46:28,329 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-19 06:46:28,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:28,331 INFO L225 Difference]: With dead ends: 55 [2020-08-19 06:46:28,331 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 06:46:28,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:46:28,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 06:46:28,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 06:46:28,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 06:46:28,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-08-19 06:46:28,340 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 41 [2020-08-19 06:46:28,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:28,341 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-08-19 06:46:28,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:46:28,341 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-08-19 06:46:28,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:46:28,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:28,342 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, 1] [2020-08-19 06:46:28,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:46:28,343 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:28,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:28,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 4 times [2020-08-19 06:46:28,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:28,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669887622] [2020-08-19 06:46:28,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:28,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:28,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:28,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:28,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:28,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,602 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:46:28,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669887622] [2020-08-19 06:46:28,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:28,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:46:28,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571937095] [2020-08-19 06:46:28,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:46:28,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:28,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:46:28,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:46:28,605 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 12 states. [2020-08-19 06:46:28,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:28,843 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-08-19 06:46:28,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:46:28,844 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2020-08-19 06:46:28,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:28,845 INFO L225 Difference]: With dead ends: 41 [2020-08-19 06:46:28,845 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 06:46:28,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:46:28,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 06:46:28,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2020-08-19 06:46:28,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:46:28,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 06:46:28,855 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 42 [2020-08-19 06:46:28,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:28,856 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 06:46:28,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:46:28,856 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 06:46:28,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 06:46:28,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:28,858 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:46:28,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:46:28,858 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:28,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:28,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1554048393, now seen corresponding path program 5 times [2020-08-19 06:46:28,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:28,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39080307] [2020-08-19 06:46:28,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:28,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:28,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:28,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:28,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:28,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:28,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:28,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:28,984 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 33 proven. 35 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2020-08-19 06:46:28,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39080307] [2020-08-19 06:46:28,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:28,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:46:28,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645338808] [2020-08-19 06:46:28,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:46:28,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:28,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:46:28,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:46:28,987 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 8 states. [2020-08-19 06:46:29,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:29,174 INFO L93 Difference]: Finished difference Result 70 states and 99 transitions. [2020-08-19 06:46:29,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:46:29,175 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 55 [2020-08-19 06:46:29,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:29,176 INFO L225 Difference]: With dead ends: 70 [2020-08-19 06:46:29,176 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:46:29,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:46:29,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:46:29,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-08-19 06:46:29,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:46:29,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2020-08-19 06:46:29,186 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 55 [2020-08-19 06:46:29,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:29,187 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2020-08-19 06:46:29,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:46:29,187 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2020-08-19 06:46:29,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-19 06:46:29,189 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:29,189 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, 1] [2020-08-19 06:46:29,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:46:29,190 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:29,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:29,190 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 6 times [2020-08-19 06:46:29,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:29,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604961834] [2020-08-19 06:46:29,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:29,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:29,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:29,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:29,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:29,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 06:46:29,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:29,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:29,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 06:46:29,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,450 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 151 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2020-08-19 06:46:29,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604961834] [2020-08-19 06:46:29,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:29,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:46:29,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945748437] [2020-08-19 06:46:29,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:46:29,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:29,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:46:29,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:46:29,452 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand 10 states. [2020-08-19 06:46:29,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:29,741 INFO L93 Difference]: Finished difference Result 92 states and 135 transitions. [2020-08-19 06:46:29,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:46:29,743 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 97 [2020-08-19 06:46:29,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:29,748 INFO L225 Difference]: With dead ends: 92 [2020-08-19 06:46:29,748 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 06:46:29,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:46:29,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 06:46:29,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2020-08-19 06:46:29,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 06:46:29,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2020-08-19 06:46:29,775 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 97 [2020-08-19 06:46:29,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:29,775 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2020-08-19 06:46:29,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:46:29,775 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2020-08-19 06:46:29,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 06:46:29,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:46:29,778 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:46:29,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:46:29,779 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:46:29,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:46:29,779 INFO L82 PathProgramCache]: Analyzing trace with hash -865837754, now seen corresponding path program 7 times [2020-08-19 06:46:29,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:46:29,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551547261] [2020-08-19 06:46:29,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:46:29,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:46:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 06:46:29,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:29,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:29,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 06:46:29,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:29,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 06:46:29,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:30,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 06:46:30,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:30,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 06:46:30,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:46:30,037 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 8 proven. 98 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 06:46:30,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551547261] [2020-08-19 06:46:30,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:46:30,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:46:30,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859411432] [2020-08-19 06:46:30,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:46:30,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:46:30,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:46:30,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:46:30,040 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand 14 states. [2020-08-19 06:46:30,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:46:30,249 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2020-08-19 06:46:30,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:46:30,249 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 69 [2020-08-19 06:46:30,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:46:30,250 INFO L225 Difference]: With dead ends: 52 [2020-08-19 06:46:30,251 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 06:46:30,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:46:30,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 06:46:30,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 06:46:30,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 06:46:30,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 06:46:30,253 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2020-08-19 06:46:30,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:46:30,253 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 06:46:30,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:46:30,253 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 06:46:30,254 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 06:46:30,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:46:30,256 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 06:46:30,447 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-08-19 06:46:30,448 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-08-19 06:46:30,448 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= fibonacci_~n |fibonacci_#in~n|) (<= 2 |fibonacci_#in~n|)) [2020-08-19 06:46:30,448 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-08-19 06:46:30,448 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (let ((.cse0 (= fibonacci_~n |fibonacci_#in~n|))) (or (and (<= |fibonacci_#in~n| 2) (<= 1 |fibonacci_#t~ret0|) .cse0 (<= 2 |fibonacci_#in~n|)) (and (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 2)) .cse0 (<= 3 |fibonacci_#in~n|)))) [2020-08-19 06:46:30,448 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 06:46:30,449 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:46:30,449 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 06:46:30,449 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 06:46:30,450 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 06:46:30,450 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-08-19 06:46:30,450 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-08-19 06:46:30,450 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-08-19 06:46:30,450 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-08-19 06:46:30,450 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-08-19 06:46:30,450 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-08-19 06:46:30,451 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-08-19 06:46:30,451 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-08-19 06:46:30,451 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-08-19 06:46:30,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 06:46:30 BoogieIcfgContainer [2020-08-19 06:46:30,457 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 06:46:30,460 INFO L168 Benchmark]: Toolchain (without parser) took 4685.00 ms. Allocated memory was 148.4 MB in the beginning and 276.3 MB in the end (delta: 127.9 MB). Free memory was 104.6 MB in the beginning and 197.6 MB in the end (delta: -93.0 MB). Peak memory consumption was 34.9 MB. Max. memory is 7.1 GB. [2020-08-19 06:46:30,461 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 06:46:30,462 INFO L168 Benchmark]: CACSL2BoogieTranslator took 253.24 ms. Allocated memory is still 148.4 MB. Free memory was 104.4 MB in the beginning and 95.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-19 06:46:30,463 INFO L168 Benchmark]: Boogie Preprocessor took 105.68 ms. Allocated memory was 148.4 MB in the beginning and 203.9 MB in the end (delta: 55.6 MB). Free memory was 95.2 MB in the beginning and 182.7 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-19 06:46:30,464 INFO L168 Benchmark]: RCFGBuilder took 277.27 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 170.3 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:46:30,465 INFO L168 Benchmark]: TraceAbstraction took 4043.86 ms. Allocated memory was 203.9 MB in the beginning and 276.3 MB in the end (delta: 72.4 MB). Free memory was 169.7 MB in the beginning and 197.6 MB in the end (delta: -27.9 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:46:30,468 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 253.24 ms. Allocated memory is still 148.4 MB. Free memory was 104.4 MB in the beginning and 95.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.68 ms. Allocated memory was 148.4 MB in the beginning and 203.9 MB in the end (delta: 55.6 MB). Free memory was 95.2 MB in the beginning and 182.7 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 277.27 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 170.3 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4043.86 ms. Allocated memory was 203.9 MB in the beginning and 276.3 MB in the end (delta: 72.4 MB). Free memory was 169.7 MB in the beginning and 197.6 MB in the end (delta: -27.9 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.7s, OverallIterations: 9, TraceHistogramMax: 13, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 158 SDtfs, 139 SDslu, 543 SDs, 0 SdLazy, 729 SolverSat, 137 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 263 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 14 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 80 PreInvPairs, 99 NumberOfFragments, 39 HoareAnnotationTreeSize, 80 FomulaSimplifications, 291 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 215 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 415 NumberOfCodeBlocks, 415 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 406 ConstructedInterpolants, 0 QuantifiedInterpolants, 50421 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 550/894 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 correct! Received shutdown request...