/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-a47f07a [2021-04-16 07:54:57,580 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-04-16 07:54:57,583 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-04-16 07:54:57,659 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-04-16 07:54:57,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-04-16 07:54:57,718 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-04-16 07:54:57,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-04-16 07:54:57,724 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-04-16 07:54:57,742 INFO L113 SettingsManager]: Loading preferences was successful [2021-04-16 07:54:57,743 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-04-16 07:54:57,747 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * sizeof long=4 [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-04-16 07:54:57,747 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-04-16 07:54:57,748 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-04-16 07:54:57,749 INFO L138 SettingsManager]: * sizeof long double=12 [2021-04-16 07:54:57,749 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-04-16 07:54:57,749 INFO L138 SettingsManager]: * Use constant arrays=true [2021-04-16 07:54:57,749 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-04-16 07:54:57,749 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-04-16 07:54:57,750 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-04-16 07:54:57,750 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-04-16 07:54:57,750 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-04-16 07:54:57,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-04-16 07:54:57,750 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-04-16 07:54:57,750 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-04-16 07:54:57,751 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-04-16 07:54:57,751 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-04-16 07:54:57,751 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-04-16 07:54:58,086 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-04-16 07:54:58,105 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-04-16 07:54:58,107 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-04-16 07:54:58,108 INFO L271 PluginConnector]: Initializing CDTParser... [2021-04-16 07:54:58,112 INFO L275 PluginConnector]: CDTParser initialized [2021-04-16 07:54:58,113 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_1.c [2021-04-16 07:54:58,175 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7732188b6/dd36828547d442ebaac1862c561b3803/FLAG49973285e [2021-04-16 07:54:58,678 INFO L306 CDTParser]: Found 1 translation units. [2021-04-16 07:54:58,679 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c [2021-04-16 07:54:58,685 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7732188b6/dd36828547d442ebaac1862c561b3803/FLAG49973285e [2021-04-16 07:54:59,171 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7732188b6/dd36828547d442ebaac1862c561b3803 [2021-04-16 07:54:59,173 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-04-16 07:54:59,175 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-04-16 07:54:59,176 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-04-16 07:54:59,176 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-04-16 07:54:59,181 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-04-16 07:54:59,181 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,182 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75f786e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59, skipping insertion in model container [2021-04-16 07:54:59,182 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,189 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-04-16 07:54:59,200 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-04-16 07:54:59,310 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c[676,689] [2021-04-16 07:54:59,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-16 07:54:59,327 INFO L203 MainTranslator]: Completed pre-run [2021-04-16 07:54:59,340 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c[676,689] [2021-04-16 07:54:59,340 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-16 07:54:59,352 INFO L208 MainTranslator]: Completed translation [2021-04-16 07:54:59,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59 WrapperNode [2021-04-16 07:54:59,353 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-04-16 07:54:59,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-04-16 07:54:59,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-04-16 07:54:59,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-04-16 07:54:59,363 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,368 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,368 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,373 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,377 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,379 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (1/1) ... [2021-04-16 07:54:59,412 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-04-16 07:54:59,413 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-04-16 07:54:59,413 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-04-16 07:54:59,413 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-04-16 07:54:59,414 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (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 [2021-04-16 07:54:59,498 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-04-16 07:54:59,498 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-04-16 07:54:59,498 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-04-16 07:54:59,498 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-04-16 07:54:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-04-16 07:54:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-04-16 07:54:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-04-16 07:54:59,500 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-04-16 07:54:59,748 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-04-16 07:54:59,748 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-04-16 07:54:59,749 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.04 07:54:59 BoogieIcfgContainer [2021-04-16 07:54:59,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-04-16 07:54:59,751 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-04-16 07:54:59,751 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-04-16 07:54:59,753 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-04-16 07:54:59,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.04 07:54:59" (1/3) ... [2021-04-16 07:54:59,754 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57af817b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.04 07:54:59, skipping insertion in model container [2021-04-16 07:54:59,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:59" (2/3) ... [2021-04-16 07:54:59,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57af817b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.04 07:54:59, skipping insertion in model container [2021-04-16 07:54:59,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.04 07:54:59" (3/3) ... [2021-04-16 07:54:59,756 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1.c [2021-04-16 07:54:59,777 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-04-16 07:54:59,780 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-04-16 07:54:59,800 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-04-16 07:54:59,825 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-16 07:54:59,826 INFO L377 AbstractCegarLoop]: Hoare is true [2021-04-16 07:54:59,826 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-04-16 07:54:59,826 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-16 07:54:59,826 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-16 07:54:59,826 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-16 07:54:59,826 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-16 07:54:59,826 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-16 07:54:59,842 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-04-16 07:54:59,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-04-16 07:54:59,848 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:59,848 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:54:59,849 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:59,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:59,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1887993331, now seen corresponding path program 1 times [2021-04-16 07:54:59,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:59,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109028883] [2021-04-16 07:54:59,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:59,921 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-04-16 07:54:59,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,024 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,026 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,027 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,028 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:00,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,161 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,162 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,164 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:00,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109028883] [2021-04-16 07:55:00,166 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:00,167 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-04-16 07:55:00,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016371141] [2021-04-16 07:55:00,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-16 07:55:00,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:00,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-16 07:55:00,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-16 07:55:00,190 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:00,249 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-04-16 07:55:00,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-16 07:55:00,252 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-04-16 07:55:00,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:00,257 INFO L225 Difference]: With dead ends: 24 [2021-04-16 07:55:00,257 INFO L226 Difference]: Without dead ends: 11 [2021-04-16 07:55:00,260 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 91.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-16 07:55:00,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-04-16 07:55:00,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-04-16 07:55:00,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2021-04-16 07:55:00,286 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2021-04-16 07:55:00,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:00,286 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2021-04-16 07:55:00,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,287 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2021-04-16 07:55:00,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-04-16 07:55:00,287 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:00,287 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:00,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-04-16 07:55:00,288 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:00,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1887999097, now seen corresponding path program 1 times [2021-04-16 07:55:00,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:00,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660614816] [2021-04-16 07:55:00,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:00,292 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-04-16 07:55:00,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,327 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,328 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,329 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,329 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,335 INFO L142 QuantifierPusher]: treesize reduction 6, result has 14.3 percent of original size [2021-04-16 07:55:00,336 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,338 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,341 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:00,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,380 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,380 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:00,381 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660614816] [2021-04-16 07:55:00,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:00,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-04-16 07:55:00,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261573081] [2021-04-16 07:55:00,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-04-16 07:55:00,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:00,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-04-16 07:55:00,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-04-16 07:55:00,384 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:00,433 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2021-04-16 07:55:00,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-04-16 07:55:00,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-04-16 07:55:00,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:00,435 INFO L225 Difference]: With dead ends: 16 [2021-04-16 07:55:00,435 INFO L226 Difference]: Without dead ends: 13 [2021-04-16 07:55:00,436 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-04-16 07:55:00,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-04-16 07:55:00,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-04-16 07:55:00,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-04-16 07:55:00,441 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2021-04-16 07:55:00,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:00,442 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-04-16 07:55:00,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,442 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-04-16 07:55:00,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-04-16 07:55:00,442 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:00,443 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:00,443 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-04-16 07:55:00,443 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:00,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:00,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1889274843, now seen corresponding path program 1 times [2021-04-16 07:55:00,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:00,444 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810833470] [2021-04-16 07:55:00,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:00,466 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,476 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,476 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_10 6) InVars {main_~a~0=v_main_~a~0_10} OutVars{main_~a~0=v_main_~a~0_10} AuxVars[] AssignedVars[] [2021-04-16 07:55:00,484 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:00,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,500 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,502 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,503 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:00,507 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,509 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,511 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,514 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,517 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,518 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,521 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,522 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,524 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:00,538 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,539 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:00,540 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:00,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,586 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,587 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,587 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,588 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,592 INFO L142 QuantifierPusher]: treesize reduction 9, result has 25.0 percent of original size [2021-04-16 07:55:00,592 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,600 INFO L142 QuantifierPusher]: treesize reduction 20, result has 13.0 percent of original size [2021-04-16 07:55:00,601 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,606 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,607 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:00,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:00,658 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,658 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:00,662 INFO L142 QuantifierPusher]: treesize reduction 13, result has 60.6 percent of original size [2021-04-16 07:55:00,665 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-04-16 07:55:00,697 INFO L142 QuantifierPusher]: treesize reduction 12, result has 20.0 percent of original size [2021-04-16 07:55:00,698 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,699 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,700 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,709 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,710 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:00,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810833470] [2021-04-16 07:55:00,710 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:00,710 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-04-16 07:55:00,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885663570] [2021-04-16 07:55:00,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-04-16 07:55:00,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:00,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-04-16 07:55:00,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-04-16 07:55:00,714 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:00,832 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2021-04-16 07:55:00,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-04-16 07:55:00,833 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-04-16 07:55:00,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:00,833 INFO L225 Difference]: With dead ends: 18 [2021-04-16 07:55:00,833 INFO L226 Difference]: Without dead ends: 15 [2021-04-16 07:55:00,834 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 131.8ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-04-16 07:55:00,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-04-16 07:55:00,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-04-16 07:55:00,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-04-16 07:55:00,849 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2021-04-16 07:55:00,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:00,850 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-04-16 07:55:00,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:00,851 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-04-16 07:55:00,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-04-16 07:55:00,851 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:00,851 INFO L519 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:00,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-04-16 07:55:00,852 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:00,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:00,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1179700547, now seen corresponding path program 2 times [2021-04-16 07:55:00,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:00,853 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412805774] [2021-04-16 07:55:00,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:00,861 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,863 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,863 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_16 5) InVars {main_~a~0=v_main_~a~0_16} OutVars{main_~a~0=v_main_~a~0_16} AuxVars[] AssignedVars[] [2021-04-16 07:55:00,870 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:00,877 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,880 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,882 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,891 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,900 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,902 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,903 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:00,909 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,911 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,914 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,916 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,917 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:00,930 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,934 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:00,934 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:00,938 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,939 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:00,939 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_18 6) InVars {main_~a~0=v_main_~a~0_18} OutVars{main_~a~0=v_main_~a~0_18} AuxVars[] AssignedVars[] [2021-04-16 07:55:00,945 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:00,952 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,955 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,958 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,960 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,966 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,968 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:00,973 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,976 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:00,978 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,980 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:00,994 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:00,995 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:00,996 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:01,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,035 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,036 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,037 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,038 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,044 INFO L142 QuantifierPusher]: treesize reduction 9, result has 25.0 percent of original size [2021-04-16 07:55:01,045 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,050 INFO L142 QuantifierPusher]: treesize reduction 20, result has 13.0 percent of original size [2021-04-16 07:55:01,050 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,056 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,056 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:01,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,121 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,121 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:01,123 INFO L142 QuantifierPusher]: treesize reduction 13, result has 60.6 percent of original size [2021-04-16 07:55:01,125 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-04-16 07:55:01,142 INFO L142 QuantifierPusher]: treesize reduction 12, result has 20.0 percent of original size [2021-04-16 07:55:01,144 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,146 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,146 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:01,153 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,153 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,154 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,155 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,162 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,163 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412805774] [2021-04-16 07:55:01,163 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:01,163 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-04-16 07:55:01,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012827743] [2021-04-16 07:55:01,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-04-16 07:55:01,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:01,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-04-16 07:55:01,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-04-16 07:55:01,166 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:01,299 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-04-16 07:55:01,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-04-16 07:55:01,300 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-04-16 07:55:01,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:01,301 INFO L225 Difference]: With dead ends: 20 [2021-04-16 07:55:01,301 INFO L226 Difference]: Without dead ends: 17 [2021-04-16 07:55:01,301 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 144.6ms TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-04-16 07:55:01,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-04-16 07:55:01,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-04-16 07:55:01,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-04-16 07:55:01,309 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2021-04-16 07:55:01,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:01,309 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-04-16 07:55:01,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,310 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-04-16 07:55:01,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-04-16 07:55:01,310 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:01,310 INFO L519 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:01,311 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-04-16 07:55:01,311 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:01,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:01,311 INFO L82 PathProgramCache]: Analyzing trace with hash -177482015, now seen corresponding path program 3 times [2021-04-16 07:55:01,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:01,311 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542650593] [2021-04-16 07:55:01,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:01,317 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,318 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,318 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_27 5) InVars {main_~a~0=v_main_~a~0_27} OutVars{main_~a~0=v_main_~a~0_27} AuxVars[] AssignedVars[] [2021-04-16 07:55:01,327 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:01,329 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,333 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,335 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:01,341 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,344 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,346 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,348 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,351 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,353 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,357 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,359 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,359 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:01,374 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,375 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:01,375 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:01,379 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,380 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,380 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_29 6) InVars {main_~a~0=v_main_~a~0_29} OutVars{main_~a~0=v_main_~a~0_29} AuxVars[] AssignedVars[] [2021-04-16 07:55:01,384 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:01,392 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,394 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,397 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,399 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,406 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,408 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:01,419 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,422 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,424 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,426 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,427 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:01,439 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,440 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:01,440 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:01,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,458 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,458 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,459 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,459 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,462 INFO L142 QuantifierPusher]: treesize reduction 9, result has 25.0 percent of original size [2021-04-16 07:55:01,463 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,467 INFO L142 QuantifierPusher]: treesize reduction 20, result has 13.0 percent of original size [2021-04-16 07:55:01,467 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,471 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,472 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:01,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,502 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,502 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:01,504 INFO L142 QuantifierPusher]: treesize reduction 10, result has 69.7 percent of original size [2021-04-16 07:55:01,508 INFO L147 QuantifierPusher]: treesize reduction 3, result has 78.6 percent of original size 11 [2021-04-16 07:55:01,533 INFO L142 QuantifierPusher]: treesize reduction 12, result has 20.0 percent of original size [2021-04-16 07:55:01,534 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,534 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,536 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:01,543 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,544 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,545 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,545 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,553 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,553 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,557 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,557 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,566 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,566 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,566 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542650593] [2021-04-16 07:55:01,567 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:01,567 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-04-16 07:55:01,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277344444] [2021-04-16 07:55:01,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-04-16 07:55:01,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:01,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-04-16 07:55:01,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-04-16 07:55:01,568 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:01,718 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-04-16 07:55:01,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-04-16 07:55:01,719 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-04-16 07:55:01,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:01,720 INFO L225 Difference]: With dead ends: 22 [2021-04-16 07:55:01,720 INFO L226 Difference]: Without dead ends: 19 [2021-04-16 07:55:01,720 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 156.6ms TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-04-16 07:55:01,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-04-16 07:55:01,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-04-16 07:55:01,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-04-16 07:55:01,725 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2021-04-16 07:55:01,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:01,726 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-04-16 07:55:01,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:01,726 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-04-16 07:55:01,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-04-16 07:55:01,726 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:01,727 INFO L519 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:01,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-04-16 07:55:01,727 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:01,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:01,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1240133887, now seen corresponding path program 4 times [2021-04-16 07:55:01,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:01,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611490704] [2021-04-16 07:55:01,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:01,732 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,733 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,733 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_39 5) InVars {main_~a~0=v_main_~a~0_39} OutVars{main_~a~0=v_main_~a~0_39} AuxVars[] AssignedVars[] [2021-04-16 07:55:01,737 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:01,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,744 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,746 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:01,749 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,751 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,753 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,758 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,761 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,763 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,765 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,767 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,768 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 47 [2021-04-16 07:55:01,783 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,784 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:01,785 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:01,787 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,789 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,789 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_41 6) InVars {main_~a~0=v_main_~a~0_41} OutVars{main_~a~0=v_main_~a~0_41} AuxVars[] AssignedVars[] [2021-04-16 07:55:01,791 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:01,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,796 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,799 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:01,802 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,804 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,806 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:01,812 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,815 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,816 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,818 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,820 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,822 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:01,849 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,852 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:01,853 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:01,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,872 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,872 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,873 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,873 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,876 INFO L142 QuantifierPusher]: treesize reduction 9, result has 25.0 percent of original size [2021-04-16 07:55:01,877 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,880 INFO L142 QuantifierPusher]: treesize reduction 20, result has 13.0 percent of original size [2021-04-16 07:55:01,881 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,884 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,885 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:01,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:01,912 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,912 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:01,914 INFO L142 QuantifierPusher]: treesize reduction 13, result has 60.6 percent of original size [2021-04-16 07:55:01,915 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-04-16 07:55:01,931 INFO L142 QuantifierPusher]: treesize reduction 12, result has 20.0 percent of original size [2021-04-16 07:55:01,932 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,932 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,933 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,939 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,939 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,940 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,940 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:01,948 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,949 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,949 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,950 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,958 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:01,958 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:01,959 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,959 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:01,968 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:01,969 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:01,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611490704] [2021-04-16 07:55:01,969 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:01,969 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-04-16 07:55:01,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115048687] [2021-04-16 07:55:01,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-04-16 07:55:01,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:01,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-04-16 07:55:01,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-04-16 07:55:01,971 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:02,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:02,155 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-04-16 07:55:02,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-04-16 07:55:02,156 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-04-16 07:55:02,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:02,157 INFO L225 Difference]: With dead ends: 24 [2021-04-16 07:55:02,157 INFO L226 Difference]: Without dead ends: 21 [2021-04-16 07:55:02,158 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 168.2ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-04-16 07:55:02,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-04-16 07:55:02,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-04-16 07:55:02,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:02,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-04-16 07:55:02,168 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2021-04-16 07:55:02,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:02,168 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-04-16 07:55:02,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:02,169 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-04-16 07:55:02,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-04-16 07:55:02,169 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:55:02,169 INFO L519 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-16 07:55:02,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-04-16 07:55:02,170 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:55:02,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:55:02,170 INFO L82 PathProgramCache]: Analyzing trace with hash 2064382877, now seen corresponding path program 5 times [2021-04-16 07:55:02,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:55:02,171 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531403334] [2021-04-16 07:55:02,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:55:02,175 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,176 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,177 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_52 5) InVars {main_~a~0=v_main_~a~0_52} OutVars{main_~a~0=v_main_~a~0_52} AuxVars[] AssignedVars[] [2021-04-16 07:55:02,180 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:02,185 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,188 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,190 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,191 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,196 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:02,204 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:02,208 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,210 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,211 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:02,213 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,213 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:02,223 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,224 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:02,224 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:02,226 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,227 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,227 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_main_~a~0_54 6) InVars {main_~a~0=v_main_~a~0_54} OutVars{main_~a~0=v_main_~a~0_54} AuxVars[] AssignedVars[] [2021-04-16 07:55:02,231 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size [2021-04-16 07:55:02,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,236 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:02,237 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-04-16 07:55:02,240 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:55:02,244 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,245 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,247 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,249 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,252 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,253 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,255 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,256 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 92.2 percent of original size 37 [2021-04-16 07:55:02,267 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,268 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:55:02,268 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:55:02,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:02,283 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,283 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:02,283 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,284 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,287 INFO L142 QuantifierPusher]: treesize reduction 9, result has 25.0 percent of original size [2021-04-16 07:55:02,287 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,291 INFO L142 QuantifierPusher]: treesize reduction 20, result has 13.0 percent of original size [2021-04-16 07:55:02,292 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,295 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,295 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:02,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:55:02,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:55:02,320 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,320 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:02,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:55:02,322 INFO L142 QuantifierPusher]: treesize reduction 10, result has 69.7 percent of original size [2021-04-16 07:55:02,323 INFO L147 QuantifierPusher]: treesize reduction 3, result has 78.6 percent of original size 11 [2021-04-16 07:55:02,344 INFO L142 QuantifierPusher]: treesize reduction 12, result has 20.0 percent of original size [2021-04-16 07:55:02,344 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,345 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,345 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:02,351 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:02,351 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,352 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,353 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:02,360 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:02,360 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,361 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,361 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,371 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:02,371 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,372 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,373 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:02,383 INFO L142 QuantifierPusher]: treesize reduction 4, result has 42.9 percent of original size [2021-04-16 07:55:02,383 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:55:02,388 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,389 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:55:02,399 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:55:02,399 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:55:02,400 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531403334] [2021-04-16 07:55:02,400 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:55:02,400 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-04-16 07:55:02,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337894927] [2021-04-16 07:55:02,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-04-16 07:55:02,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:55:02,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-04-16 07:55:02,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-04-16 07:55:02,403 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:02,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:55:02,670 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-04-16 07:55:02,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-04-16 07:55:02,671 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-04-16 07:55:02,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:55:02,671 INFO L225 Difference]: With dead ends: 25 [2021-04-16 07:55:02,671 INFO L226 Difference]: Without dead ends: 0 [2021-04-16 07:55:02,672 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 254.6ms TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-04-16 07:55:02,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-04-16 07:55:02,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-04-16 07:55:02,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-16 07:55:02,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-04-16 07:55:02,673 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 19 [2021-04-16 07:55:02,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:55:02,673 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-04-16 07:55:02,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-04-16 07:55:02,673 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-04-16 07:55:02,673 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-04-16 07:55:02,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-04-16 07:55:02,676 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-04-16 07:55:02,917 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 16 [2021-04-16 07:55:03,060 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 14 [2021-04-16 07:55:03,069 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 13) no Hoare annotation was computed. [2021-04-16 07:55:03,069 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 13) no Hoare annotation was computed. [2021-04-16 07:55:03,069 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 13) no Hoare annotation was computed. [2021-04-16 07:55:03,069 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,069 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-04-16 07:55:03,069 INFO L201 CegarLoopUtils]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L194 CegarLoopUtils]: At program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 23) the Hoare annotation is: false [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 15 26) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point mainEXIT(lines 15 26) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L194 CegarLoopUtils]: At program point L23(line 23) the Hoare annotation is: false [2021-04-16 07:55:03,070 INFO L201 CegarLoopUtils]: At program point L22-1(lines 22 24) the Hoare annotation is: true [2021-04-16 07:55:03,070 INFO L194 CegarLoopUtils]: At program point L19-2(lines 19 21) the Hoare annotation is: (or (= 5 main_~a~0) (= main_~a~0 1) (= main_~a~0 3) (= main_~a~0 4) (= main_~a~0 0) (= main_~a~0 2)) [2021-04-16 07:55:03,070 INFO L194 CegarLoopUtils]: At program point L19-3(lines 19 21) the Hoare annotation is: (or (= main_~a~0 6) (= 5 main_~a~0) (= main_~a~0 1) (= main_~a~0 3) (= main_~a~0 4) (= main_~a~0 0) (= main_~a~0 2)) [2021-04-16 07:55:03,071 INFO L194 CegarLoopUtils]: At program point L19-4(lines 15 26) the Hoare annotation is: (= main_~a~0 6) [2021-04-16 07:55:03,071 INFO L201 CegarLoopUtils]: At program point mainFINAL(lines 15 26) the Hoare annotation is: true [2021-04-16 07:55:03,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.04 07:55:03 BoogieIcfgContainer [2021-04-16 07:55:03,094 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-04-16 07:55:03,094 INFO L168 Benchmark]: Toolchain (without parser) took 3919.53 ms. Allocated memory was 212.9 MB in the beginning and 269.5 MB in the end (delta: 56.6 MB). Free memory was 178.2 MB in the beginning and 147.3 MB in the end (delta: 30.9 MB). Peak memory consumption was 88.6 MB. Max. memory is 8.0 GB. [2021-04-16 07:55:03,095 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 212.9 MB. Free memory was 195.1 MB in the beginning and 195.0 MB in the end (delta: 87.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-04-16 07:55:03,095 INFO L168 Benchmark]: CACSL2BoogieTranslator took 176.86 ms. Allocated memory is still 212.9 MB. Free memory was 178.1 MB in the beginning and 169.0 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-04-16 07:55:03,095 INFO L168 Benchmark]: Boogie Preprocessor took 58.03 ms. Allocated memory is still 212.9 MB. Free memory was 169.0 MB in the beginning and 197.4 MB in the end (delta: -28.5 MB). Peak memory consumption was 8.6 MB. Max. memory is 8.0 GB. [2021-04-16 07:55:03,095 INFO L168 Benchmark]: RCFGBuilder took 336.89 ms. Allocated memory is still 212.9 MB. Free memory was 197.4 MB in the beginning and 184.3 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-04-16 07:55:03,096 INFO L168 Benchmark]: TraceAbstraction took 3342.56 ms. Allocated memory was 212.9 MB in the beginning and 269.5 MB in the end (delta: 56.6 MB). Free memory was 183.8 MB in the beginning and 147.3 MB in the end (delta: 36.5 MB). Peak memory consumption was 94.7 MB. Max. memory is 8.0 GB. [2021-04-16 07:55:03,097 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 212.9 MB. Free memory was 195.1 MB in the beginning and 195.0 MB in the end (delta: 87.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 176.86 ms. Allocated memory is still 212.9 MB. Free memory was 178.1 MB in the beginning and 169.0 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 58.03 ms. Allocated memory is still 212.9 MB. Free memory was 169.0 MB in the beginning and 197.4 MB in the end (delta: -28.5 MB). Peak memory consumption was 8.6 MB. Max. memory is 8.0 GB. * RCFGBuilder took 336.89 ms. Allocated memory is still 212.9 MB. Free memory was 197.4 MB in the beginning and 184.3 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3342.56 ms. Allocated memory was 212.9 MB in the beginning and 269.5 MB in the end (delta: 56.6 MB). Free memory was 183.8 MB in the beginning and 147.3 MB in the end (delta: 36.5 MB). Peak memory consumption was 94.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 23]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2850.8ms, OverallIterations: 7, TraceHistogramMax: 5, EmptinessCheckTime: 14.4ms, AutomataDifference: 1011.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 394.1ms, InitialAbstractionConstructionTime: 10.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 60 SDtfs, 74 SDslu, 135 SDs, 0 SdLazy, 393 SolverSat, 40 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 249.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 107 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 1003.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred in iteration=6, InterpolantAutomatonStates: 43, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 58.7ms AutomataMinimizationTime, 7 MinimizatonAttempts, 5 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 16 LocationsWithAnnotation, 16 PreInvPairs, 35 NumberOfFragments, 87 HoareAnnotationTreeSize, 16 FomulaSimplifications, 5808 FormulaSimplificationTreeSizeReduction, 93.5ms HoareSimplificationTime, 16 FomulaSimplificationsInter, 554 FormulaSimplificationTreeSizeReductionInter, 289.7ms HoareSimplificationTimeInter, 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 19]: Loop Invariant Derived loop invariant: (((((a == 6 || 5 == a) || a == 1) || a == 3) || a == 4) || a == 0) || a == 2 - ProcedureContractResult [Line: 15]: Procedure Contract for main Derived contract for procedure main: 1 RESULT: Ultimate proved your program to be correct! Received shutdown request...