/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:02:10,660 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:02:10,663 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:02:10,681 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:02:10,681 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:02:10,684 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:02:10,685 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:02:10,698 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:02:10,700 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:02:10,701 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:02:10,702 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:02:10,703 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:02:10,704 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:02:10,705 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:02:10,706 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:02:10,707 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:02:10,707 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:02:10,708 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:02:10,710 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:02:10,712 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:02:10,713 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:02:10,714 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:02:10,715 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:02:10,716 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:02:10,718 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:02:10,725 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:02:10,726 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:02:10,727 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:02:10,728 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:02:10,743 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:02:10,743 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:02:10,744 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:02:10,745 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:02:10,745 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:02:10,745 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:02:10,745 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:02:10,745 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:02:10,746 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:02:10,746 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:02:10,746 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:02:10,746 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:02:10,746 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:02:10,747 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:02:10,747 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:02:10,747 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:02:10,747 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:02:10,748 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:02:10,748 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:02:10,748 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:02:10,748 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:02:10,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:02:10,749 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:02:10,749 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:02:10,749 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:02:10,749 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:02:10,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,750 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:02:10,750 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:02:10,750 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:02:11,107 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:02:11,128 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:02:11,131 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:02:11,133 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:02:11,136 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:02:11,137 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-21 16:02:11,210 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c164532cd/c80c4488f0e549eaa501cdba9340c689/FLAG5e454ec7b [2020-07-21 16:02:11,768 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:02:11,769 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-21 16:02:11,780 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c164532cd/c80c4488f0e549eaa501cdba9340c689/FLAG5e454ec7b [2020-07-21 16:02:12,116 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c164532cd/c80c4488f0e549eaa501cdba9340c689 [2020-07-21 16:02:12,129 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:02:12,133 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:02:12,135 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:02:12,135 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:02:12,140 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:02:12,141 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,145 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a922da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12, skipping insertion in model container [2020-07-21 16:02:12,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,155 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:02:12,177 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:02:12,435 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:12,442 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:02:12,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:12,474 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:02:12,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12 WrapperNode [2020-07-21 16:02:12,475 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:02:12,476 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:02:12,476 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:02:12,476 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:02:12,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,499 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,499 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,594 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,600 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,601 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... [2020-07-21 16:02:12,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:02:12,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:02:12,610 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:02:12,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:02:12,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:02:12,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:02:12,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:02:12,688 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 16:02:12,688 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 16:02:12,689 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:02:12,690 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 16:02:12,690 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:02:12,690 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 16:02:12,690 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 16:02:12,691 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:02:12,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:02:12,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:02:12,954 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:02:12,955 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:02:12,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:12 BoogieIcfgContainer [2020-07-21 16:02:12,962 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:02:12,964 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:02:12,965 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:02:12,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:02:12,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:02:12" (1/3) ... [2020-07-21 16:02:12,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73850388 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:12, skipping insertion in model container [2020-07-21 16:02:12,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:12" (2/3) ... [2020-07-21 16:02:12,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73850388 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:12, skipping insertion in model container [2020-07-21 16:02:12,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:12" (3/3) ... [2020-07-21 16:02:12,975 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b2_o3.c [2020-07-21 16:02:12,991 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:02:13,002 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:02:13,060 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:02:13,147 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:02:13,147 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:02:13,148 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:02:13,148 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:02:13,149 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:02:13,149 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:02:13,149 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:02:13,150 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:02:13,179 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 16:02:13,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:02:13,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:13,200 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:13,201 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:13,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:13,208 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 16:02:13,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:13,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906911344] [2020-07-21 16:02:13,219 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:13,292 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:13,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:13,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:13,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:13,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:02:13,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:13,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906911344] [2020-07-21 16:02:13,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:13,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:13,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123155321] [2020-07-21 16:02:13,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:13,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:13,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:13,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:13,443 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 16:02:13,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:13,535 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 16:02:13,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:13,539 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:02:13,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:13,554 INFO L225 Difference]: With dead ends: 40 [2020-07-21 16:02:13,554 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 16:02:13,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:13,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 16:02:13,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 16:02:13,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:02:13,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 16:02:13,621 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 16:02:13,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:13,622 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 16:02:13,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:13,623 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 16:02:13,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:02:13,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:13,626 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:13,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:13,842 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:13,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:13,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 16:02:13,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:13,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718293992] [2020-07-21 16:02:13,845 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:13,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:13,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:13,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:13,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:13,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:02:13,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:13,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718293992] [2020-07-21 16:02:13,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:13,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:13,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744506885] [2020-07-21 16:02:13,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:13,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:13,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:13,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:13,958 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 16:02:14,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:14,001 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 16:02:14,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:14,003 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 16:02:14,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:14,005 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:02:14,005 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:02:14,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:14,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:02:14,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:02:14,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:02:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 16:02:14,020 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 16:02:14,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:14,020 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 16:02:14,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:14,021 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 16:02:14,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:02:14,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:14,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:14,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,237 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:14,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:14,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 16:02:14,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:14,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109122734] [2020-07-21 16:02:14,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:14,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:14,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:02:14,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:14,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:02:14,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:14,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109122734] [2020-07-21 16:02:14,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:14,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:02:14,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850148077] [2020-07-21 16:02:14,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:02:14,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:14,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:02:14,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:02:14,375 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 16:02:14,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:14,452 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 16:02:14,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:14,453 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 16:02:14,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:14,455 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:02:14,456 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:02:14,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:14,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:02:14,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:02:14,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:02:14,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 16:02:14,467 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 16:02:14,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:14,468 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 16:02:14,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:02:14,468 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 16:02:14,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:14,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:14,470 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 16:02:14,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,685 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:14,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:14,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 16:02:14,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:14,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172578287] [2020-07-21 16:02:14,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:14,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:14,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:02:14,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:14,796 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:14,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:14,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172578287] [2020-07-21 16:02:14,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:14,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:14,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490352248] [2020-07-21 16:02:14,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:14,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:14,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:14,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:14,805 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 16:02:14,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:14,835 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 16:02:14,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:14,837 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 16:02:14,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:14,839 INFO L225 Difference]: With dead ends: 48 [2020-07-21 16:02:14,839 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:02:14,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:14,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:02:14,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 16:02:14,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 16:02:14,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 16:02:14,850 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 16:02:14,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:14,851 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 16:02:14,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:14,851 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 16:02:14,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:14,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:14,853 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 16:02:15,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:15,067 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:15,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:15,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 16:02:15,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:15,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275753042] [2020-07-21 16:02:15,069 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:15,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:15,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:15,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:02:15,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:15,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:15,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:15,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275753042] [2020-07-21 16:02:15,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:15,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:02:15,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632723547] [2020-07-21 16:02:15,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:02:15,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:15,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:02:15,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:02:15,191 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2020-07-21 16:02:15,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:15,297 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 16:02:15,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:15,299 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 16:02:15,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:15,300 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:02:15,300 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 16:02:15,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:15,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 16:02:15,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-21 16:02:15,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 16:02:15,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 16:02:15,311 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2020-07-21 16:02:15,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:15,311 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 16:02:15,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:02:15,312 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 16:02:15,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:15,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:15,313 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 16:02:15,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:15,528 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:15,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:15,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 16:02:15,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:15,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157625815] [2020-07-21 16:02:15,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:15,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:15,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:15,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:02:15,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:15,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:15,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:16,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:02:16,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157625815] [2020-07-21 16:02:16,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:16,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 16:02:16,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507712204] [2020-07-21 16:02:16,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:02:16,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:16,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:02:16,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:02:16,194 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 20 states. [2020-07-21 16:02:16,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:16,454 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2020-07-21 16:02:16,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:02:16,455 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-21 16:02:16,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:16,456 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:02:16,456 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:02:16,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:16,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:02:16,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:02:16,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:02:16,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:02:16,459 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 16:02:16,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:16,459 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:02:16,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:02:16,460 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:02:16,460 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:02:16,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:16,665 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:02:16,741 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:02:16,741 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:16,742 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 16:02:16,742 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-21 16:02:16,742 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-21 16:02:16,742 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-21 16:02:16,742 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-21 16:02:16,743 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-21 16:02:16,743 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-21 16:02:16,743 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:16,743 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:02:16,744 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:02:16,744 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:02:16,744 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-21 16:02:16,745 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-21 16:02:16,745 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 16:02:16,745 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-21 16:02:16,745 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-21 16:02:16,745 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 16:02:16,746 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 16:02:16,746 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-21 16:02:16,746 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-21 16:02:16,746 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 16:02:16,747 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-21 16:02:16,748 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-21 16:02:16,748 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 16:02:16,748 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 16:02:16,748 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 16:02:16,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:02:16 BoogieIcfgContainer [2020-07-21 16:02:16,765 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:02:16,770 INFO L168 Benchmark]: Toolchain (without parser) took 4636.23 ms. Allocated memory was 137.9 MB in the beginning and 230.2 MB in the end (delta: 92.3 MB). Free memory was 101.4 MB in the beginning and 108.8 MB in the end (delta: -7.4 MB). Peak memory consumption was 84.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,772 INFO L168 Benchmark]: CDTParser took 0.59 ms. Allocated memory is still 137.9 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,776 INFO L168 Benchmark]: CACSL2BoogieTranslator took 340.60 ms. Allocated memory is still 137.9 MB. Free memory was 101.0 MB in the beginning and 91.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,778 INFO L168 Benchmark]: Boogie Preprocessor took 127.04 ms. Allocated memory was 137.9 MB in the beginning and 200.8 MB in the end (delta: 62.9 MB). Free memory was 91.4 MB in the beginning and 180.0 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,786 INFO L168 Benchmark]: RCFGBuilder took 353.05 ms. Allocated memory is still 200.8 MB. Free memory was 179.6 MB in the beginning and 166.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,787 INFO L168 Benchmark]: TraceAbstraction took 3800.59 ms. Allocated memory was 200.8 MB in the beginning and 230.2 MB in the end (delta: 29.4 MB). Free memory was 165.9 MB in the beginning and 108.8 MB in the end (delta: 57.1 MB). Peak memory consumption was 86.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:16,807 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.59 ms. Allocated memory is still 137.9 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 340.60 ms. Allocated memory is still 137.9 MB. Free memory was 101.0 MB in the beginning and 91.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.04 ms. Allocated memory was 137.9 MB in the beginning and 200.8 MB in the end (delta: 62.9 MB). Free memory was 91.4 MB in the beginning and 180.0 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 353.05 ms. Allocated memory is still 200.8 MB. Free memory was 179.6 MB in the beginning and 166.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3800.59 ms. Allocated memory was 200.8 MB in the beginning and 230.2 MB in the end (delta: 29.4 MB). Free memory was 165.9 MB in the beginning and 108.8 MB in the end (delta: 57.1 MB). Peak memory consumption was 86.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: 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 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.5s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 169 SDtfs, 20 SDslu, 874 SDs, 0 SdLazy, 199 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 160 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 134 NumberOfCodeBlocks, 98 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 154 ConstructedInterpolants, 0 QuantifiedInterpolants, 6982 SizeOfPredicates, 10 NumberOfNonLiveVariables, 244 ConjunctsInSsa, 66 ConjunctsInUnsatCore, 7 InterpolantComputations, 5 PerfectInterpolantSequences, 12/16 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...