/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 13:08:11,944 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 13:08:11,947 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 13:08:11,967 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 13:08:11,967 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 13:08:11,969 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 13:08:11,971 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 13:08:11,982 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 13:08:11,985 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 13:08:11,986 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 13:08:11,987 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 13:08:11,988 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 13:08:11,988 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 13:08:11,989 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 13:08:11,990 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 13:08:11,991 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 13:08:11,992 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 13:08:11,993 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 13:08:11,994 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 13:08:11,996 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 13:08:11,997 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 13:08:11,998 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 13:08:11,999 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 13:08:12,000 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 13:08:12,002 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 13:08:12,009 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 13:08:12,010 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 13:08:12,011 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 13:08:12,012 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-07 13:08:12,021 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 13:08:12,022 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 13:08:12,023 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 13:08:12,023 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 13:08:12,023 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 13:08:12,024 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 13:08:12,025 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 13:08:12,025 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 13:08:12,025 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 13:08:12,025 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 13:08:12,025 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-07 13:08:12,026 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 13:08:12,026 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 13:08:12,026 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:08:12,026 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 13:08:12,026 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-07 13:08:12,027 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 13:08:12,027 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-07 13:08:12,367 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 13:08:12,391 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 13:08:12,395 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 13:08:12,396 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 13:08:12,397 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 13:08:12,398 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-07 13:08:12,467 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cf13933/0ff92dd0e89c46a1a020080f9ae53437/FLAG5ddba9b75 [2020-07-07 13:08:12,929 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 13:08:12,929 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-07 13:08:12,936 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cf13933/0ff92dd0e89c46a1a020080f9ae53437/FLAG5ddba9b75 [2020-07-07 13:08:13,316 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cf13933/0ff92dd0e89c46a1a020080f9ae53437 [2020-07-07 13:08:13,329 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 13:08:13,332 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 13:08:13,335 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 13:08:13,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 13:08:13,339 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 13:08:13,340 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,344 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@531939f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13, skipping insertion in model container [2020-07-07 13:08:13,344 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,355 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 13:08:13,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 13:08:13,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:08:13,556 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 13:08:13,572 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:08:13,585 INFO L208 MainTranslator]: Completed translation [2020-07-07 13:08:13,585 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13 WrapperNode [2020-07-07 13:08:13,585 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 13:08:13,586 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 13:08:13,586 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 13:08:13,586 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 13:08:13,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,604 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,604 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,610 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,611 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (1/1) ... [2020-07-07 13:08:13,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 13:08:13,613 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 13:08:13,613 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 13:08:13,613 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 13:08:13,614 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (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 [2020-07-07 13:08:13,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 13:08:13,778 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 13:08:13,778 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-07 13:08:13,778 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 13:08:13,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-07 13:08:13,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 13:08:13,779 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-07 13:08:13,779 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 13:08:13,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 13:08:13,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 13:08:13,971 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 13:08:13,971 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 13:08:13,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:08:13 BoogieIcfgContainer [2020-07-07 13:08:13,976 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 13:08:13,977 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 13:08:13,977 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 13:08:13,981 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 13:08:13,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 01:08:13" (1/3) ... [2020-07-07 13:08:13,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d3ddfc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:08:13, skipping insertion in model container [2020-07-07 13:08:13,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:13" (2/3) ... [2020-07-07 13:08:13,983 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d3ddfc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:08:13, skipping insertion in model container [2020-07-07 13:08:13,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:08:13" (3/3) ... [2020-07-07 13:08:13,985 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-2.c [2020-07-07 13:08:13,999 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-07 13:08:14,011 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 13:08:14,027 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 13:08:14,057 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 13:08:14,057 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 13:08:14,058 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-07 13:08:14,058 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 13:08:14,058 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 13:08:14,058 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 13:08:14,058 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 13:08:14,058 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 13:08:14,079 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-07-07 13:08:14,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-07 13:08:14,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:14,094 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:14,094 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:14,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:14,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1756383024, now seen corresponding path program 1 times [2020-07-07 13:08:14,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:14,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480189678] [2020-07-07 13:08:14,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:14,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:08:14,343 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:14,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480189678] [2020-07-07 13:08:14,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:14,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:08:14,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163143506] [2020-07-07 13:08:14,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:08:14,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:14,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:08:14,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:08:14,368 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 5 states. [2020-07-07 13:08:14,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:14,528 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2020-07-07 13:08:14,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 13:08:14,530 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-07-07 13:08:14,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:14,554 INFO L225 Difference]: With dead ends: 44 [2020-07-07 13:08:14,554 INFO L226 Difference]: Without dead ends: 28 [2020-07-07 13:08:14,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 13:08:14,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-07 13:08:14,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-07 13:08:14,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-07 13:08:14,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-07 13:08:14,650 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2020-07-07 13:08:14,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:14,651 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-07 13:08:14,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:08:14,652 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-07 13:08:14,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-07 13:08:14,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:14,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:14,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 13:08:14,662 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:14,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:14,663 INFO L82 PathProgramCache]: Analyzing trace with hash -389703589, now seen corresponding path program 1 times [2020-07-07 13:08:14,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:14,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284405875] [2020-07-07 13:08:14,666 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:14,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:08:14,750 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:14,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284405875] [2020-07-07 13:08:14,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:14,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:08:14,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457840820] [2020-07-07 13:08:14,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:08:14,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:14,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:08:14,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:08:14,755 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 5 states. [2020-07-07 13:08:14,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:14,832 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-07-07 13:08:14,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 13:08:14,833 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-07 13:08:14,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:14,835 INFO L225 Difference]: With dead ends: 36 [2020-07-07 13:08:14,835 INFO L226 Difference]: Without dead ends: 30 [2020-07-07 13:08:14,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 13:08:14,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-07 13:08:14,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-07-07 13:08:14,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-07 13:08:14,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-07 13:08:14,849 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 17 [2020-07-07 13:08:14,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:14,850 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-07 13:08:14,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:08:14,850 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-07 13:08:14,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-07 13:08:14,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:14,852 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:14,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 13:08:14,853 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:14,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:14,853 INFO L82 PathProgramCache]: Analyzing trace with hash 50309368, now seen corresponding path program 1 times [2020-07-07 13:08:14,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:14,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870973809] [2020-07-07 13:08:14,854 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:14,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:14,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,021 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-07 13:08:15,024 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:15,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870973809] [2020-07-07 13:08:15,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:15,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-07 13:08:15,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668021605] [2020-07-07 13:08:15,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-07 13:08:15,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:15,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-07 13:08:15,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:08:15,031 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2020-07-07 13:08:15,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:15,159 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2020-07-07 13:08:15,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-07 13:08:15,160 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-07-07 13:08:15,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:15,162 INFO L225 Difference]: With dead ends: 52 [2020-07-07 13:08:15,162 INFO L226 Difference]: Without dead ends: 30 [2020-07-07 13:08:15,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-07 13:08:15,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-07 13:08:15,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-07 13:08:15,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-07 13:08:15,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-07 13:08:15,176 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 33 [2020-07-07 13:08:15,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:15,177 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-07 13:08:15,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-07 13:08:15,177 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-07 13:08:15,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-07 13:08:15,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:15,180 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, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:15,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-07 13:08:15,180 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:15,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:15,181 INFO L82 PathProgramCache]: Analyzing trace with hash -643371531, now seen corresponding path program 1 times [2020-07-07 13:08:15,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:15,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664668332] [2020-07-07 13:08:15,182 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:15,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,313 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-07 13:08:15,313 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:15,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664668332] [2020-07-07 13:08:15,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:15,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-07 13:08:15,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218141364] [2020-07-07 13:08:15,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-07 13:08:15,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:15,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-07 13:08:15,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:08:15,318 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 7 states. [2020-07-07 13:08:15,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:15,458 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2020-07-07 13:08:15,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-07 13:08:15,459 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-07-07 13:08:15,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:15,462 INFO L225 Difference]: With dead ends: 56 [2020-07-07 13:08:15,462 INFO L226 Difference]: Without dead ends: 50 [2020-07-07 13:08:15,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-07-07 13:08:15,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-07 13:08:15,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-07 13:08:15,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-07 13:08:15,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2020-07-07 13:08:15,481 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 34 [2020-07-07 13:08:15,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:15,481 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2020-07-07 13:08:15,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-07 13:08:15,481 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2020-07-07 13:08:15,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-07 13:08:15,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:15,484 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:15,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-07 13:08:15,485 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:15,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:15,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1274787059, now seen corresponding path program 2 times [2020-07-07 13:08:15,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:15,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287515827] [2020-07-07 13:08:15,486 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:15,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,704 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-07 13:08:15,704 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:15,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287515827] [2020-07-07 13:08:15,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:15,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-07 13:08:15,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888687912] [2020-07-07 13:08:15,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-07 13:08:15,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:15,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-07 13:08:15,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-07 13:08:15,707 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand 9 states. [2020-07-07 13:08:15,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:15,852 INFO L93 Difference]: Finished difference Result 111 states and 156 transitions. [2020-07-07 13:08:15,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-07 13:08:15,852 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2020-07-07 13:08:15,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:15,858 INFO L225 Difference]: With dead ends: 111 [2020-07-07 13:08:15,859 INFO L226 Difference]: Without dead ends: 67 [2020-07-07 13:08:15,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-07-07 13:08:15,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-07 13:08:15,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 55. [2020-07-07 13:08:15,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-07 13:08:15,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-07-07 13:08:15,878 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-07-07 13:08:15,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:15,879 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-07-07 13:08:15,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-07 13:08:15,879 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-07-07 13:08:15,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-07 13:08:15,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:15,882 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:15,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-07 13:08:15,882 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:15,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:15,883 INFO L82 PathProgramCache]: Analyzing trace with hash 99184320, now seen corresponding path program 3 times [2020-07-07 13:08:15,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:15,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771886037] [2020-07-07 13:08:15,884 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:15,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:15,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,021 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-07 13:08:16,021 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:16,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771886037] [2020-07-07 13:08:16,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:16,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-07 13:08:16,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210531494] [2020-07-07 13:08:16,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-07 13:08:16,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:16,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-07 13:08:16,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-07 13:08:16,024 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 9 states. [2020-07-07 13:08:16,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:16,152 INFO L93 Difference]: Finished difference Result 89 states and 117 transitions. [2020-07-07 13:08:16,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-07 13:08:16,153 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 52 [2020-07-07 13:08:16,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:16,156 INFO L225 Difference]: With dead ends: 89 [2020-07-07 13:08:16,156 INFO L226 Difference]: Without dead ends: 83 [2020-07-07 13:08:16,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-07 13:08:16,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-07 13:08:16,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 77. [2020-07-07 13:08:16,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-07 13:08:16,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 103 transitions. [2020-07-07 13:08:16,176 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 103 transitions. Word has length 52 [2020-07-07 13:08:16,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:16,177 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 103 transitions. [2020-07-07 13:08:16,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-07 13:08:16,177 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 103 transitions. [2020-07-07 13:08:16,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-07 13:08:16,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:16,183 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:16,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-07 13:08:16,183 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:16,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:16,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1883941443, now seen corresponding path program 4 times [2020-07-07 13:08:16,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:16,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405811652] [2020-07-07 13:08:16,185 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:16,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:16,635 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 17 proven. 70 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2020-07-07 13:08:16,636 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:16,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405811652] [2020-07-07 13:08:16,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:16,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2020-07-07 13:08:16,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306976046] [2020-07-07 13:08:16,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-07 13:08:16,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:16,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-07 13:08:16,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-07-07 13:08:16,639 INFO L87 Difference]: Start difference. First operand 77 states and 103 transitions. Second operand 15 states. [2020-07-07 13:08:16,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:16,969 INFO L93 Difference]: Finished difference Result 142 states and 213 transitions. [2020-07-07 13:08:16,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-07 13:08:16,970 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 123 [2020-07-07 13:08:16,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:16,973 INFO L225 Difference]: With dead ends: 142 [2020-07-07 13:08:16,974 INFO L226 Difference]: Without dead ends: 73 [2020-07-07 13:08:16,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-07 13:08:16,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-07 13:08:16,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-07-07 13:08:16,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-07 13:08:16,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 86 transitions. [2020-07-07 13:08:16,991 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 86 transitions. Word has length 123 [2020-07-07 13:08:16,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:16,992 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 86 transitions. [2020-07-07 13:08:16,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-07 13:08:16,992 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 86 transitions. [2020-07-07 13:08:16,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2020-07-07 13:08:16,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:16,996 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:16,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-07-07 13:08:16,997 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:16,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:16,997 INFO L82 PathProgramCache]: Analyzing trace with hash 532445701, now seen corresponding path program 5 times [2020-07-07 13:08:16,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:16,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867136449] [2020-07-07 13:08:16,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Garbage collection #1: 17 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 17 to 31 Garbage collection #2: 31 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 31 to 61 Garbage collection #3: 61 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 61 to 113 Garbage collection #4: 113 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 113 to 223 [2020-07-07 13:08:17,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:17,682 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 47 proven. 92 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-07 13:08:17,682 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:17,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867136449] [2020-07-07 13:08:17,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:17,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2020-07-07 13:08:17,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522431820] [2020-07-07 13:08:17,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-07 13:08:17,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:17,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-07 13:08:17,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-07 13:08:17,686 INFO L87 Difference]: Start difference. First operand 70 states and 86 transitions. Second operand 18 states. [2020-07-07 13:08:18,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:18,127 INFO L93 Difference]: Finished difference Result 149 states and 214 transitions. [2020-07-07 13:08:18,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-07 13:08:18,127 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 193 [2020-07-07 13:08:18,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:18,130 INFO L225 Difference]: With dead ends: 149 [2020-07-07 13:08:18,130 INFO L226 Difference]: Without dead ends: 92 [2020-07-07 13:08:18,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=622, Unknown=0, NotChecked=0, Total=812 [2020-07-07 13:08:18,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-07 13:08:18,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 85. [2020-07-07 13:08:18,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-07 13:08:18,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 104 transitions. [2020-07-07 13:08:18,148 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 104 transitions. Word has length 193 [2020-07-07 13:08:18,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:18,149 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 104 transitions. [2020-07-07 13:08:18,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-07 13:08:18,149 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 104 transitions. [2020-07-07 13:08:18,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2020-07-07 13:08:18,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:18,153 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 8, 8, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:18,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-07-07 13:08:18,153 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:18,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:18,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1227428144, now seen corresponding path program 6 times [2020-07-07 13:08:18,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:18,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342905613] [2020-07-07 13:08:18,154 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Garbage collection #1: 17 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 17 to 31 Garbage collection #2: 31 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 31 to 61 Garbage collection #3: 61 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 61 to 113 Garbage collection #4: 113 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 113 to 223 [2020-07-07 13:08:18,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:18,678 INFO L134 CoverageAnalysis]: Checked inductivity of 384 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-07 13:08:18,678 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:18,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342905613] [2020-07-07 13:08:18,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:18,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2020-07-07 13:08:18,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995346938] [2020-07-07 13:08:18,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-07 13:08:18,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:18,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-07 13:08:18,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-07-07 13:08:18,681 INFO L87 Difference]: Start difference. First operand 85 states and 104 transitions. Second operand 15 states. [2020-07-07 13:08:18,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:18,918 INFO L93 Difference]: Finished difference Result 248 states and 331 transitions. [2020-07-07 13:08:18,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-07 13:08:18,919 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 228 [2020-07-07 13:08:18,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:18,924 INFO L225 Difference]: With dead ends: 248 [2020-07-07 13:08:18,924 INFO L226 Difference]: Without dead ends: 242 [2020-07-07 13:08:18,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-07 13:08:18,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-07-07 13:08:18,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 218. [2020-07-07 13:08:18,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-07 13:08:18,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 295 transitions. [2020-07-07 13:08:18,963 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 295 transitions. Word has length 228 [2020-07-07 13:08:18,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:18,964 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 295 transitions. [2020-07-07 13:08:18,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-07 13:08:18,964 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 295 transitions. [2020-07-07 13:08:18,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-07 13:08:18,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:18,971 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 13, 13, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:18,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-07-07 13:08:18,971 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:18,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:18,972 INFO L82 PathProgramCache]: Analyzing trace with hash 260846875, now seen corresponding path program 7 times [2020-07-07 13:08:18,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:18,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434822252] [2020-07-07 13:08:18,973 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Garbage collection #1: 17 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 17 to 31 Garbage collection #2: 31 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 31 to 61 Garbage collection #3: 61 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 61 to 113 Garbage collection #4: 113 nodes / 0 free / 0.0s / 0.0s total Resizing node table from 113 to 223 [2020-07-07 13:08:19,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 13:08:19,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 13:08:19,174 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:19,174 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-07 13:08:19,174 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-07 13:08:19,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-07-07 13:08:19,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 01:08:19 BoogieIcfgContainer [2020-07-07 13:08:19,212 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 13:08:19,215 INFO L168 Benchmark]: Toolchain (without parser) took 5882.69 ms. Allocated memory was 142.6 MB in the beginning and 337.6 MB in the end (delta: 195.0 MB). Free memory was 99.3 MB in the beginning and 184.8 MB in the end (delta: -85.5 MB). Peak memory consumption was 109.5 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,216 INFO L168 Benchmark]: CDTParser took 1.02 ms. Allocated memory is still 142.6 MB. Free memory was 117.9 MB in the beginning and 117.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,217 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.50 ms. Allocated memory is still 142.6 MB. Free memory was 99.1 MB in the beginning and 89.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,218 INFO L168 Benchmark]: Boogie Preprocessor took 26.52 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 88.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,222 INFO L168 Benchmark]: RCFGBuilder took 363.34 ms. Allocated memory was 142.6 MB in the beginning and 199.8 MB in the end (delta: 57.1 MB). Free memory was 88.4 MB in the beginning and 166.9 MB in the end (delta: -78.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,223 INFO L168 Benchmark]: TraceAbstraction took 5234.84 ms. Allocated memory was 199.8 MB in the beginning and 337.6 MB in the end (delta: 137.9 MB). Free memory was 166.3 MB in the beginning and 184.8 MB in the end (delta: -18.6 MB). Peak memory consumption was 119.3 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:19,228 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.02 ms. Allocated memory is still 142.6 MB. Free memory was 117.9 MB in the beginning and 117.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.50 ms. Allocated memory is still 142.6 MB. Free memory was 99.1 MB in the beginning and 89.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.52 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 88.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 363.34 ms. Allocated memory was 142.6 MB in the beginning and 199.8 MB in the end (delta: 57.1 MB). Free memory was 88.4 MB in the beginning and 166.9 MB in the end (delta: -78.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5234.84 ms. Allocated memory was 199.8 MB in the beginning and 337.6 MB in the end (delta: 137.9 MB). Free memory was 166.3 MB in the beginning and 184.8 MB in the end (delta: -18.6 MB). Peak memory consumption was 119.3 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; [L25] CALL, EXPR fibo(x) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) [L25] int result = fibo(x); [L26] COND TRUE result == 13 [L27] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.1s, OverallIterations: 10, TraceHistogramMax: 41, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 260 SDtfs, 571 SDslu, 892 SDs, 0 SdLazy, 878 SolverSat, 349 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 292 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=218occurred in iteration=9, 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, 9 MinimizatonAttempts, 54 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...