/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 11:13:54,129 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 11:13:54,133 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 11:13:54,154 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 11:13:54,155 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 11:13:54,157 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 11:13:54,159 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 11:13:54,171 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 11:13:54,175 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 11:13:54,179 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 11:13:54,181 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 11:13:54,183 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-07-07 11:13:54,210 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-07 11:13:54,228 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 11:13:54,228 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 11:13:54,229 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-07 11:13:54,230 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-07 11:13:54,230 INFO L138 SettingsManager]: * Use SBE=true [2020-07-07 11:13:54,230 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 11:13:54,230 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 11:13:54,231 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 11:13:54,232 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 11:13:54,232 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 11:13:54,232 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 11:13:54,232 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 11:13:54,233 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 11:13:54,233 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-07 11:13:54,233 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 11:13:54,233 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 11:13:54,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 11:13:54,234 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 11:13:54,234 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-07 11:13:54,234 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-07 11:13:54,234 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-07 11:13:54,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-07 11:13:54,235 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 11:13:54,235 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-07 11:13:54,235 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-07 11:13:54,599 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 11:13:54,614 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 11:13:54,618 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 11:13:54,620 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 11:13:54,621 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 11:13:54,622 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-2.c [2020-07-07 11:13:54,707 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/942b3b29a/cf1c25b792434bfe99ee2feb6bf5fb35/FLAG08ae29701 [2020-07-07 11:13:55,268 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 11:13:55,269 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-2.c [2020-07-07 11:13:55,279 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/942b3b29a/cf1c25b792434bfe99ee2feb6bf5fb35/FLAG08ae29701 [2020-07-07 11:13:55,578 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/942b3b29a/cf1c25b792434bfe99ee2feb6bf5fb35 [2020-07-07 11:13:55,590 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 11:13:55,592 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 11:13:55,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 11:13:55,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 11:13:55,599 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 11:13:55,600 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,606 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d8033bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55, skipping insertion in model container [2020-07-07 11:13:55,607 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,619 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 11:13:55,647 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 11:13:55,905 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:13:55,911 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 11:13:55,926 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:13:55,943 INFO L208 MainTranslator]: Completed translation [2020-07-07 11:13:55,944 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55 WrapperNode [2020-07-07 11:13:55,944 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 11:13:55,945 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 11:13:55,945 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 11:13:55,945 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 11:13:55,962 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,963 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,970 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... [2020-07-07 11:13:55,980 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 11:13:55,980 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 11:13:55,981 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 11:13:55,981 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 11:13:55,982 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 11:13:56,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 11:13:56,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 11:13:56,175 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-07 11:13:56,176 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 11:13:56,176 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 11:13:56,176 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-07 11:13:56,176 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 11:13:56,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 11:13:56,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 11:13:56,386 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 11:13:56,386 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 11:13:56,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:13:56 BoogieIcfgContainer [2020-07-07 11:13:56,391 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 11:13:56,393 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 11:13:56,393 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 11:13:56,398 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 11:13:56,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 11:13:55" (1/3) ... [2020-07-07 11:13:56,399 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d2fcd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:13:56, skipping insertion in model container [2020-07-07 11:13:56,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:13:55" (2/3) ... [2020-07-07 11:13:56,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37d2fcd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:13:56, skipping insertion in model container [2020-07-07 11:13:56,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:13:56" (3/3) ... [2020-07-07 11:13:56,403 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-2.c [2020-07-07 11:13:56,418 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-07 11:13:56,430 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 11:13:56,483 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 11:13:56,553 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 11:13:56,554 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 11:13:56,554 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-07 11:13:56,555 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 11:13:56,555 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 11:13:56,559 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 11:13:56,559 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 11:13:56,560 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 11:13:56,606 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-07 11:13:56,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-07 11:13:56,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:13:56,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:13:56,621 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:13:56,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:13:56,629 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-07 11:13:56,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:13:56,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962756869] [2020-07-07 11:13:56,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:13:56,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:56,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:56,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:56,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:13:56,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962756869] [2020-07-07 11:13:56,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:13:56,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 11:13:56,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074042109] [2020-07-07 11:13:56,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 11:13:56,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:13:56,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 11:13:56,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 11:13:56,908 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-07 11:13:57,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:13:57,032 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-07 11:13:57,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 11:13:57,035 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-07 11:13:57,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:13:57,050 INFO L225 Difference]: With dead ends: 30 [2020-07-07 11:13:57,050 INFO L226 Difference]: Without dead ends: 18 [2020-07-07 11:13:57,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 11:13:57,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-07 11:13:57,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-07 11:13:57,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-07 11:13:57,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-07 11:13:57,126 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-07 11:13:57,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:13:57,127 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-07 11:13:57,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 11:13:57,128 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-07 11:13:57,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-07 11:13:57,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:13:57,131 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:13:57,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 11:13:57,132 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:13:57,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:13:57,133 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-07 11:13:57,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:13:57,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733298685] [2020-07-07 11:13:57,134 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:13:57,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:57,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:57,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:57,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-07 11:13:57,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733298685] [2020-07-07 11:13:57,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597723217] [2020-07-07 11:13:57,338 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:13:57,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:57,407 INFO L264 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-07 11:13:57,414 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:13:57,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-07 11:13:57,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:13:57,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-07-07 11:13:57,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499806974] [2020-07-07 11:13:57,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-07 11:13:57,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:13:57,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-07 11:13:57,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-07 11:13:57,488 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-07-07 11:13:57,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:13:57,613 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-07 11:13:57,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-07 11:13:57,615 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-07 11:13:57,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:13:57,617 INFO L225 Difference]: With dead ends: 25 [2020-07-07 11:13:57,617 INFO L226 Difference]: Without dead ends: 21 [2020-07-07 11:13:57,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-07-07 11:13:57,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-07 11:13:57,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-07 11:13:57,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-07 11:13:57,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-07 11:13:57,637 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-07 11:13:57,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:13:57,640 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-07 11:13:57,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-07 11:13:57,641 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-07 11:13:57,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-07 11:13:57,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:13:57,644 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:13:57,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-07-07 11:13:57,860 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:13:57,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:13:57,861 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-07 11:13:57,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:13:57,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265242261] [2020-07-07 11:13:57,862 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:13:57,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:58,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:58,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:58,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:58,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:13:58,280 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-07 11:13:58,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265242261] [2020-07-07 11:13:58,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908832144] [2020-07-07 11:13:58,282 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:13:58,328 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-07-07 11:13:58,328 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-07 11:13:58,330 INFO L264 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-07 11:13:58,333 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2020-07-07 11:13:58,665 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-07 11:13:58,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-07 11:13:58,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 22 [2020-07-07 11:13:58,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709281670] [2020-07-07 11:13:58,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-07 11:13:58,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:13:58,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-07 11:13:58,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=404, Unknown=0, NotChecked=0, Total=462 [2020-07-07 11:13:58,669 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 22 states. [2020-07-07 11:13:59,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:13:59,121 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-07-07 11:13:59,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-07 11:13:59,122 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2020-07-07 11:13:59,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:13:59,123 INFO L225 Difference]: With dead ends: 24 [2020-07-07 11:13:59,123 INFO L226 Difference]: Without dead ends: 0 [2020-07-07 11:13:59,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=122, Invalid=690, Unknown=0, NotChecked=0, Total=812 [2020-07-07 11:13:59,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-07 11:13:59,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-07 11:13:59,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-07 11:13:59,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-07 11:13:59,127 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-07 11:13:59,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:13:59,128 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-07 11:13:59,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-07 11:13:59,128 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-07 11:13:59,128 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-07 11:13:59,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-07 11:13:59,333 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-07 11:13:59,385 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-07 11:13:59,385 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-07 11:13:59,385 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-07 11:13:59,385 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-07 11:13:59,386 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-07 11:13:59,386 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-07 11:13:59,386 INFO L268 CegarLoopResult]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2020-07-07 11:13:59,387 INFO L264 CegarLoopResult]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (= sum_~n |sum_#in~n|) (<= 1 sum_~n)) [2020-07-07 11:13:59,388 INFO L268 CegarLoopResult]: For program point L7-1(line 7) no Hoare annotation was computed. [2020-07-07 11:13:59,388 INFO L268 CegarLoopResult]: For program point L4(lines 4 8) no Hoare annotation was computed. [2020-07-07 11:13:59,388 INFO L268 CegarLoopResult]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2020-07-07 11:13:59,388 INFO L271 CegarLoopResult]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2020-07-07 11:13:59,389 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2020-07-07 11:13:59,389 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2020-07-07 11:13:59,389 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2020-07-07 11:13:59,389 INFO L268 CegarLoopResult]: For program point L16(line 16) no Hoare annotation was computed. [2020-07-07 11:13:59,389 INFO L268 CegarLoopResult]: For program point L15(lines 15 17) no Hoare annotation was computed. [2020-07-07 11:13:59,390 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (= 2 main_~a~0) [2020-07-07 11:13:59,390 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-07 11:13:59,390 INFO L268 CegarLoopResult]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2020-07-07 11:13:59,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 11:13:59 BoogieIcfgContainer [2020-07-07 11:13:59,404 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 11:13:59,408 INFO L168 Benchmark]: Toolchain (without parser) took 3814.08 ms. Allocated memory was 135.3 MB in the beginning and 226.5 MB in the end (delta: 91.2 MB). Free memory was 100.6 MB in the beginning and 112.5 MB in the end (delta: -11.9 MB). Peak memory consumption was 79.3 MB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,410 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 135.3 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,413 INFO L168 Benchmark]: CACSL2BoogieTranslator took 350.15 ms. Allocated memory is still 135.3 MB. Free memory was 100.4 MB in the beginning and 91.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,414 INFO L168 Benchmark]: Boogie Preprocessor took 35.06 ms. Allocated memory is still 135.3 MB. Free memory was 91.1 MB in the beginning and 89.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,416 INFO L168 Benchmark]: RCFGBuilder took 411.15 ms. Allocated memory was 135.3 MB in the beginning and 199.8 MB in the end (delta: 64.5 MB). Free memory was 89.7 MB in the beginning and 168.2 MB in the end (delta: -78.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,423 INFO L168 Benchmark]: TraceAbstraction took 3010.73 ms. Allocated memory was 199.8 MB in the beginning and 226.5 MB in the end (delta: 26.7 MB). Free memory was 167.5 MB in the beginning and 112.5 MB in the end (delta: 54.9 MB). Peak memory consumption was 81.7 MB. Max. memory is 7.1 GB. [2020-07-07 11:13:59,437 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 135.3 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 350.15 ms. Allocated memory is still 135.3 MB. Free memory was 100.4 MB in the beginning and 91.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.06 ms. Allocated memory is still 135.3 MB. Free memory was 91.1 MB in the beginning and 89.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 411.15 ms. Allocated memory was 135.3 MB in the beginning and 199.8 MB in the end (delta: 64.5 MB). Free memory was 89.7 MB in the beginning and 168.2 MB in the end (delta: -78.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3010.73 ms. Allocated memory was 199.8 MB in the beginning and 226.5 MB in the end (delta: 26.7 MB). Free memory was 167.5 MB in the beginning and 112.5 MB in the end (delta: 54.9 MB). Peak memory consumption was 81.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.7s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 38 SDtfs, 33 SDslu, 180 SDs, 0 SdLazy, 201 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 90 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 18 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 4 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 101 NumberOfCodeBlocks, 101 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 96 ConstructedInterpolants, 0 QuantifiedInterpolants, 8760 SizeOfPredicates, 11 NumberOfNonLiveVariables, 126 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 21/36 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...