java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBpl.xml -s ../../../trunk/examples/settings/heapseparator/heapsep-2018-09-18.epf -i ../../../trunk/examples/programs/20181010-MemSafetyPathprograms/diff-alloca_true-valid-memsafety_true-termination.i_15.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-502d2f4 [2018-10-12 21:00:11,579 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-12 21:00:11,581 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-12 21:00:11,598 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-12 21:00:11,599 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-12 21:00:11,600 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-12 21:00:11,601 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-12 21:00:11,603 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-12 21:00:11,605 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-12 21:00:11,606 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-12 21:00:11,606 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-12 21:00:11,607 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-12 21:00:11,608 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-12 21:00:11,609 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-12 21:00:11,610 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-12 21:00:11,611 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-12 21:00:11,612 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-12 21:00:11,613 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-12 21:00:11,615 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-12 21:00:11,617 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-12 21:00:11,618 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-12 21:00:11,619 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-12 21:00:11,621 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-12 21:00:11,630 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/heapseparator/heapsep-2018-09-18.epf [2018-10-12 21:00:11,640 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-12 21:00:11,640 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-12 21:00:11,641 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-12 21:00:11,641 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-10-12 21:00:11,642 INFO L133 SettingsManager]: * Parallel states before merging=1 [2018-10-12 21:00:11,642 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-12 21:00:11,643 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-12 21:00:11,643 INFO L133 SettingsManager]: * Size of a code block=SingleStatement [2018-10-12 21:00:11,643 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-12 21:00:11,643 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_TreeInterpolation [2018-10-12 21:00:11,643 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-12 21:00:11,644 INFO L133 SettingsManager]: * Order in Petri net unfolding=Ken McMillan [2018-10-12 21:00:11,644 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-12 21:00:11,645 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-10-12 21:00:11,645 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-10-12 21:00:11,703 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-12 21:00:11,720 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-12 21:00:11,727 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-12 21:00:11,728 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-12 21:00:11,729 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-12 21:00:11,730 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20181010-MemSafetyPathprograms/diff-alloca_true-valid-memsafety_true-termination.i_15.bpl [2018-10-12 21:00:11,730 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20181010-MemSafetyPathprograms/diff-alloca_true-valid-memsafety_true-termination.i_15.bpl' [2018-10-12 21:00:11,808 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-12 21:00:11,809 INFO L131 ToolchainWalker]: Walking toolchain with 3 elements. [2018-10-12 21:00:11,810 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-12 21:00:11,811 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-12 21:00:11,811 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-12 21:00:11,838 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,840 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,859 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,859 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,873 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,879 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,883 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/1) ... [2018-10-12 21:00:11,886 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-12 21:00:11,887 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-12 21:00:11,887 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-12 21:00:11,887 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-12 21:00:11,888 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (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:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-10-12 21:00:11,949 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-10-12 21:00:11,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-12 21:00:11,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-12 21:00:12,774 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-12 21:00:12,775 INFO L202 PluginConnector]: Adding new model diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 09:00:12 BoogieIcfgContainer [2018-10-12 21:00:12,775 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-12 21:00:12,779 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-12 21:00:12,779 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-12 21:00:12,784 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-12 21:00:12,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.10 09:00:11" (1/2) ... [2018-10-12 21:00:12,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77b22545 and model type diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 09:00:12, skipping insertion in model container [2018-10-12 21:00:12,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 09:00:12" (2/2) ... [2018-10-12 21:00:12,789 INFO L112 eAbstractionObserver]: Analyzing ICFG diff-alloca_true-valid-memsafety_true-termination.i_15.bpl [2018-10-12 21:00:12,800 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:Craig_TreeInterpolation Determinization: PREDICATE_ABSTRACTION [2018-10-12 21:00:12,811 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-12 21:00:12,829 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-12 21:00:12,864 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-12 21:00:12,865 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-12 21:00:12,865 INFO L383 AbstractCegarLoop]: Hoare is false [2018-10-12 21:00:12,866 INFO L384 AbstractCegarLoop]: Compute interpolants for Craig_TreeInterpolation [2018-10-12 21:00:12,866 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-12 21:00:12,866 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-12 21:00:12,866 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-12 21:00:12,866 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-12 21:00:12,866 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-12 21:00:12,895 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states. [2018-10-12 21:00:12,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-12 21:00:12,921 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:12,926 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:12,930 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:12,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:12,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1855468826, now seen corresponding path program 1 times [2018-10-12 21:00:13,004 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:13,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:13,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-12 21:00:13,642 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-12 21:00:13,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-10-12 21:00:13,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-12 21:00:13,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-12 21:00:13,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-10-12 21:00:13,668 INFO L87 Difference]: Start difference. First operand 115 states. Second operand 8 states. [2018-10-12 21:00:14,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:14,007 INFO L93 Difference]: Finished difference Result 173 states and 179 transitions. [2018-10-12 21:00:14,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-12 21:00:14,009 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 76 [2018-10-12 21:00:14,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:14,024 INFO L225 Difference]: With dead ends: 173 [2018-10-12 21:00:14,025 INFO L226 Difference]: Without dead ends: 173 [2018-10-12 21:00:14,027 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2018-10-12 21:00:14,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-10-12 21:00:14,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 114. [2018-10-12 21:00:14,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-12 21:00:14,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 117 transitions. [2018-10-12 21:00:14,077 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 117 transitions. Word has length 76 [2018-10-12 21:00:14,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:14,078 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 117 transitions. [2018-10-12 21:00:14,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-12 21:00:14,079 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 117 transitions. [2018-10-12 21:00:14,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-12 21:00:14,083 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:14,083 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:14,083 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:14,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:14,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1644367544, now seen corresponding path program 1 times [2018-10-12 21:00:14,085 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:14,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-12 21:00:14,245 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-12 21:00:14,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-12 21:00:14,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-12 21:00:14,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-12 21:00:14,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-12 21:00:14,249 INFO L87 Difference]: Start difference. First operand 114 states and 117 transitions. Second operand 4 states. [2018-10-12 21:00:14,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:14,465 INFO L93 Difference]: Finished difference Result 128 states and 131 transitions. [2018-10-12 21:00:14,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-12 21:00:14,466 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 97 [2018-10-12 21:00:14,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:14,472 INFO L225 Difference]: With dead ends: 128 [2018-10-12 21:00:14,472 INFO L226 Difference]: Without dead ends: 128 [2018-10-12 21:00:14,473 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-12 21:00:14,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-12 21:00:14,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2018-10-12 21:00:14,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-12 21:00:14,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 119 transitions. [2018-10-12 21:00:14,489 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 119 transitions. Word has length 97 [2018-10-12 21:00:14,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:14,490 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 119 transitions. [2018-10-12 21:00:14,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-12 21:00:14,491 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 119 transitions. [2018-10-12 21:00:14,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-12 21:00:14,496 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:14,496 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:14,496 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:14,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:14,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1647690663, now seen corresponding path program 1 times [2018-10-12 21:00:14,499 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:15,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-12 21:00:15,269 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-12 21:00:15,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2018-10-12 21:00:15,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-12 21:00:15,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-12 21:00:15,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-10-12 21:00:15,271 INFO L87 Difference]: Start difference. First operand 116 states and 119 transitions. Second operand 12 states. [2018-10-12 21:00:16,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:16,089 INFO L93 Difference]: Finished difference Result 171 states and 177 transitions. [2018-10-12 21:00:16,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-12 21:00:16,089 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 99 [2018-10-12 21:00:16,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:16,092 INFO L225 Difference]: With dead ends: 171 [2018-10-12 21:00:16,093 INFO L226 Difference]: Without dead ends: 171 [2018-10-12 21:00:16,094 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=162, Invalid=344, Unknown=0, NotChecked=0, Total=506 [2018-10-12 21:00:16,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-10-12 21:00:16,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 164. [2018-10-12 21:00:16,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-12 21:00:16,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 170 transitions. [2018-10-12 21:00:16,105 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 170 transitions. Word has length 99 [2018-10-12 21:00:16,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:16,106 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 170 transitions. [2018-10-12 21:00:16,106 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-12 21:00:16,106 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 170 transitions. [2018-10-12 21:00:16,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-12 21:00:16,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:16,109 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:16,110 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:16,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:16,110 INFO L82 PathProgramCache]: Analyzing trace with hash -2123365913, now seen corresponding path program 1 times [2018-10-12 21:00:16,111 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:16,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:16,846 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-12 21:00:16,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:16,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2018-10-12 21:00:16,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-12 21:00:16,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-12 21:00:16,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2018-10-12 21:00:16,849 INFO L87 Difference]: Start difference. First operand 164 states and 170 transitions. Second operand 19 states. [2018-10-12 21:00:18,359 WARN L178 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 51 [2018-10-12 21:00:18,999 WARN L178 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2018-10-12 21:00:19,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:19,779 INFO L93 Difference]: Finished difference Result 385 states and 403 transitions. [2018-10-12 21:00:19,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-12 21:00:19,780 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 150 [2018-10-12 21:00:19,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:19,784 INFO L225 Difference]: With dead ends: 385 [2018-10-12 21:00:19,784 INFO L226 Difference]: Without dead ends: 385 [2018-10-12 21:00:19,785 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=368, Invalid=1114, Unknown=0, NotChecked=0, Total=1482 [2018-10-12 21:00:19,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2018-10-12 21:00:19,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 212. [2018-10-12 21:00:19,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2018-10-12 21:00:19,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 221 transitions. [2018-10-12 21:00:19,799 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 221 transitions. Word has length 150 [2018-10-12 21:00:19,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:19,800 INFO L481 AbstractCegarLoop]: Abstraction has 212 states and 221 transitions. [2018-10-12 21:00:19,800 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-12 21:00:19,800 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 221 transitions. [2018-10-12 21:00:19,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-12 21:00:19,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:19,804 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:19,804 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:19,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:19,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1062568806, now seen corresponding path program 1 times [2018-10-12 21:00:19,805 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:19,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 95 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-12 21:00:20,460 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:20,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2018-10-12 21:00:20,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-12 21:00:20,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-12 21:00:20,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2018-10-12 21:00:20,462 INFO L87 Difference]: Start difference. First operand 212 states and 221 transitions. Second operand 21 states. [2018-10-12 21:00:22,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:22,915 INFO L93 Difference]: Finished difference Result 436 states and 457 transitions. [2018-10-12 21:00:22,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-12 21:00:22,916 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 179 [2018-10-12 21:00:22,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:22,920 INFO L225 Difference]: With dead ends: 436 [2018-10-12 21:00:22,920 INFO L226 Difference]: Without dead ends: 436 [2018-10-12 21:00:22,921 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=428, Invalid=1378, Unknown=0, NotChecked=0, Total=1806 [2018-10-12 21:00:22,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2018-10-12 21:00:22,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 248. [2018-10-12 21:00:22,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-10-12 21:00:22,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 260 transitions. [2018-10-12 21:00:22,934 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 260 transitions. Word has length 179 [2018-10-12 21:00:22,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:22,935 INFO L481 AbstractCegarLoop]: Abstraction has 248 states and 260 transitions. [2018-10-12 21:00:22,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-12 21:00:22,935 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 260 transitions. [2018-10-12 21:00:22,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-12 21:00:22,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:22,939 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:22,939 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:22,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:22,940 INFO L82 PathProgramCache]: Analyzing trace with hash -411067481, now seen corresponding path program 2 times [2018-10-12 21:00:22,941 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:22,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:24,764 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 2 proven. 135 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-12 21:00:24,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:24,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-10-12 21:00:24,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-12 21:00:24,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-12 21:00:24,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=457, Unknown=0, NotChecked=0, Total=506 [2018-10-12 21:00:24,766 INFO L87 Difference]: Start difference. First operand 248 states and 260 transitions. Second operand 23 states. [2018-10-12 21:00:28,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:28,041 INFO L93 Difference]: Finished difference Result 491 states and 515 transitions. [2018-10-12 21:00:28,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-12 21:00:28,046 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 201 [2018-10-12 21:00:28,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:28,048 INFO L225 Difference]: With dead ends: 491 [2018-10-12 21:00:28,048 INFO L226 Difference]: Without dead ends: 361 [2018-10-12 21:00:28,050 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=658, Invalid=2204, Unknown=0, NotChecked=0, Total=2862 [2018-10-12 21:00:28,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2018-10-12 21:00:28,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 298. [2018-10-12 21:00:28,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-12 21:00:28,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 312 transitions. [2018-10-12 21:00:28,071 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 312 transitions. Word has length 201 [2018-10-12 21:00:28,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:28,072 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 312 transitions. [2018-10-12 21:00:28,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-12 21:00:28,072 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 312 transitions. [2018-10-12 21:00:28,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2018-10-12 21:00:28,080 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:28,080 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:28,081 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:28,081 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:28,081 INFO L82 PathProgramCache]: Analyzing trace with hash -2043264313, now seen corresponding path program 2 times [2018-10-12 21:00:28,083 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:28,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:29,352 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 26 proven. 153 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-12 21:00:29,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:29,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2018-10-12 21:00:29,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-12 21:00:29,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-12 21:00:29,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=457, Unknown=0, NotChecked=0, Total=506 [2018-10-12 21:00:29,354 INFO L87 Difference]: Start difference. First operand 298 states and 312 transitions. Second operand 23 states. [2018-10-12 21:00:32,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:32,098 INFO L93 Difference]: Finished difference Result 467 states and 490 transitions. [2018-10-12 21:00:32,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-12 21:00:32,098 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 208 [2018-10-12 21:00:32,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:32,102 INFO L225 Difference]: With dead ends: 467 [2018-10-12 21:00:32,102 INFO L226 Difference]: Without dead ends: 467 [2018-10-12 21:00:32,103 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=501, Invalid=1755, Unknown=0, NotChecked=0, Total=2256 [2018-10-12 21:00:32,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2018-10-12 21:00:32,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 298. [2018-10-12 21:00:32,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-12 21:00:32,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 312 transitions. [2018-10-12 21:00:32,110 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 312 transitions. Word has length 208 [2018-10-12 21:00:32,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:32,111 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 312 transitions. [2018-10-12 21:00:32,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-12 21:00:32,111 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 312 transitions. [2018-10-12 21:00:32,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-10-12 21:00:32,114 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:32,114 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:32,114 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:32,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:32,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1979002348, now seen corresponding path program 3 times [2018-10-12 21:00:32,115 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:32,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:32,942 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 5 proven. 213 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-12 21:00:32,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:32,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-10-12 21:00:32,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-12 21:00:32,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-12 21:00:32,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=543, Unknown=0, NotChecked=0, Total=600 [2018-10-12 21:00:32,944 INFO L87 Difference]: Start difference. First operand 298 states and 312 transitions. Second operand 25 states. [2018-10-12 21:00:34,482 WARN L178 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 51 [2018-10-12 21:00:36,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:36,628 INFO L93 Difference]: Finished difference Result 529 states and 555 transitions. [2018-10-12 21:00:36,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-12 21:00:36,629 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 230 [2018-10-12 21:00:36,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:36,632 INFO L225 Difference]: With dead ends: 529 [2018-10-12 21:00:36,632 INFO L226 Difference]: Without dead ends: 341 [2018-10-12 21:00:36,633 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=780, Invalid=2642, Unknown=0, NotChecked=0, Total=3422 [2018-10-12 21:00:36,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2018-10-12 21:00:36,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 333. [2018-10-12 21:00:36,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-10-12 21:00:36,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 349 transitions. [2018-10-12 21:00:36,639 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 349 transitions. Word has length 230 [2018-10-12 21:00:36,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:36,640 INFO L481 AbstractCegarLoop]: Abstraction has 333 states and 349 transitions. [2018-10-12 21:00:36,640 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-12 21:00:36,640 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 349 transitions. [2018-10-12 21:00:36,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-10-12 21:00:36,641 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:36,642 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:36,642 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:36,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:36,642 INFO L82 PathProgramCache]: Analyzing trace with hash -586269990, now seen corresponding path program 4 times [2018-10-12 21:00:36,643 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:37,424 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 32 proven. 186 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-12 21:00:37,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:37,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2018-10-12 21:00:37,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-12 21:00:37,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-12 21:00:37,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=543, Unknown=0, NotChecked=0, Total=600 [2018-10-12 21:00:37,426 INFO L87 Difference]: Start difference. First operand 333 states and 349 transitions. Second operand 25 states. [2018-10-12 21:00:41,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:41,188 INFO L93 Difference]: Finished difference Result 506 states and 531 transitions. [2018-10-12 21:00:41,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-12 21:00:41,189 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 230 [2018-10-12 21:00:41,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:41,191 INFO L225 Difference]: With dead ends: 506 [2018-10-12 21:00:41,192 INFO L226 Difference]: Without dead ends: 283 [2018-10-12 21:00:41,194 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=774, Invalid=2648, Unknown=0, NotChecked=0, Total=3422 [2018-10-12 21:00:41,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-12 21:00:41,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2018-10-12 21:00:41,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-10-12 21:00:41,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 295 transitions. [2018-10-12 21:00:41,206 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 295 transitions. Word has length 230 [2018-10-12 21:00:41,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:41,207 INFO L481 AbstractCegarLoop]: Abstraction has 282 states and 295 transitions. [2018-10-12 21:00:41,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-12 21:00:41,207 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 295 transitions. [2018-10-12 21:00:41,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2018-10-12 21:00:41,208 INFO L367 BasicCegarLoop]: Found error trace [2018-10-12 21:00:41,209 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-12 21:00:41,209 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-12 21:00:41,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-12 21:00:41,209 INFO L82 PathProgramCache]: Analyzing trace with hash 219705031, now seen corresponding path program 5 times [2018-10-12 21:00:41,210 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-12 21:00:41,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-12 21:00:42,041 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 31 proven. 299 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-10-12 21:00:42,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-12 21:00:42,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2018-10-12 21:00:42,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-12 21:00:42,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-12 21:00:42,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2018-10-12 21:00:42,043 INFO L87 Difference]: Start difference. First operand 282 states and 295 transitions. Second operand 27 states. [2018-10-12 21:00:46,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-12 21:00:46,592 INFO L93 Difference]: Finished difference Result 351 states and 367 transitions. [2018-10-12 21:00:46,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-12 21:00:46,592 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 259 [2018-10-12 21:00:46,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-12 21:00:46,593 INFO L225 Difference]: With dead ends: 351 [2018-10-12 21:00:46,593 INFO L226 Difference]: Without dead ends: 0 [2018-10-12 21:00:46,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=853, Invalid=3179, Unknown=0, NotChecked=0, Total=4032 [2018-10-12 21:00:46,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-12 21:00:46,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-12 21:00:46,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-12 21:00:46,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-12 21:00:46,596 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 259 [2018-10-12 21:00:46,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-12 21:00:46,597 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-12 21:00:46,597 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-12 21:00:46,597 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-12 21:00:46,597 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-12 21:00:46,602 INFO L202 PluginConnector]: Adding new model diff-alloca_true-valid-memsafety_true-termination.i_15.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.10 09:00:46 BoogieIcfgContainer [2018-10-12 21:00:46,603 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-12 21:00:46,604 INFO L168 Benchmark]: Toolchain (without parser) took 34795.38 ms. Allocated memory was 1.5 GB in the beginning and 1.9 GB in the end (delta: 405.3 MB). Free memory was 1.5 GB in the beginning and 1.9 GB in the end (delta: -412.4 MB). There was no memory consumed. Max. memory is 7.1 GB. [2018-10-12 21:00:46,605 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-12 21:00:46,605 INFO L168 Benchmark]: Boogie Preprocessor took 75.98 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-12 21:00:46,606 INFO L168 Benchmark]: RCFGBuilder took 888.38 ms. Allocated memory is still 1.5 GB. Free memory was 1.5 GB in the beginning and 1.4 GB in the end (delta: 31.7 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. [2018-10-12 21:00:46,607 INFO L168 Benchmark]: TraceAbstraction took 33823.99 ms. Allocated memory was 1.5 GB in the beginning and 1.9 GB in the end (delta: 405.3 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -444.1 MB). There was no memory consumed. Max. memory is 7.1 GB. [2018-10-12 21:00:46,611 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 75.98 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 888.38 ms. Allocated memory is still 1.5 GB. Free memory was 1.5 GB in the beginning and 1.4 GB in the end (delta: 31.7 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 33823.99 ms. Allocated memory was 1.5 GB in the beginning and 1.9 GB in the end (delta: 405.3 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -444.1 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 223]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 115 locations, 1 error locations. SAFE Result, 33.7s OverallTime, 10 OverallIterations, 5 TraceHistogramMax, 24.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1920 SDtfs, 15654 SDslu, 14991 SDs, 0 SdLazy, 7279 SolverSat, 259 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 413 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 19.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=333occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 680 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 7.0s InterpolantComputationTime, 1729 NumberOfCodeBlocks, 1729 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 1719 ConstructedInterpolants, 0 QuantifiedInterpolants, 4715625 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 10 InterpolantComputations, 3 PerfectInterpolantSequences, 123/1246 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diff-alloca_true-valid-memsafety_true-termination.i_15.bpl_heapsep-2018-09-18.epf_AutomizerBpl.xml/Csv-Benchmark-0-2018-10-12_21-00-46-621.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diff-alloca_true-valid-memsafety_true-termination.i_15.bpl_heapsep-2018-09-18.epf_AutomizerBpl.xml/Csv-TraceAbstractionBenchmarks-0-2018-10-12_21-00-46-621.csv Received shutdown request...