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/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/sum02.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1cc990c [2018-09-30 20:20:34,586 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 20:20:34,589 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 20:20:34,600 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 20:20:34,600 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 20:20:34,601 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 20:20:34,604 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 20:20:34,606 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 20:20:34,608 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 20:20:34,608 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 20:20:34,613 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 20:20:34,613 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 20:20:34,616 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 20:20:34,617 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 20:20:34,621 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 20:20:34,622 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 20:20:34,623 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 20:20:34,625 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 20:20:34,628 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 20:20:34,630 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 20:20:34,631 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 20:20:34,632 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 20:20:34,634 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-30 20:20:34,642 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-30 20:20:34,658 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 20:20:34,659 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 20:20:34,659 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 20:20:34,660 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 20:20:34,660 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 20:20:34,660 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 20:20:34,661 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 20:20:34,661 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 20:20:34,661 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 20:20:34,661 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 20:20:34,661 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 20:20:34,662 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 20:20:34,662 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 20:20:34,662 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 20:20:34,662 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 20:20:34,662 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 20:20:34,663 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 20:20:34,663 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 20:20:34,663 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 20:20:34,663 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 20:20:34,663 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 20:20:34,664 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 20:20:34,664 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:20:34,664 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 20:20:34,664 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 20:20:34,664 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 20:20:34,665 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 20:20:34,665 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 20:20:34,665 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 20:20:34,665 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 20:20:34,727 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 20:20:34,741 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 20:20:34,748 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 20:20:34,750 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 20:20:34,750 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 20:20:34,751 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/sum02.i_3.bpl [2018-09-30 20:20:34,751 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/sum02.i_3.bpl' [2018-09-30 20:20:34,808 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 20:20:34,811 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 20:20:34,812 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 20:20:34,812 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 20:20:34,812 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 20:20:34,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,842 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,848 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 20:20:34,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 20:20:34,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 20:20:34,849 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 20:20:34,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,861 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,861 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,866 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,867 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/1) ... [2018-09-30 20:20:34,868 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 20:20:34,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 20:20:34,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 20:20:34,869 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 20:20:34,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (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 [2018-09-30 20:20:34,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 20:20:34,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 20:20:35,161 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 20:20:35,161 INFO L202 PluginConnector]: Adding new model sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:20:35 BoogieIcfgContainer [2018-09-30 20:20:35,161 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 20:20:35,163 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 20:20:35,163 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 20:20:35,166 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 20:20:35,166 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:34" (1/2) ... [2018-09-30 20:20:35,167 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63247b57 and model type sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 08:20:35, skipping insertion in model container [2018-09-30 20:20:35,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:20:35" (2/2) ... [2018-09-30 20:20:35,169 INFO L112 eAbstractionObserver]: Analyzing ICFG sum02.i_3.bpl [2018-09-30 20:20:35,179 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 20:20:35,187 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 20:20:35,238 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 20:20:35,239 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 20:20:35,239 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 20:20:35,240 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 20:20:35,240 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 20:20:35,240 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 20:20:35,240 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 20:20:35,240 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 20:20:35,241 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 20:20:35,256 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-30 20:20:35,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 20:20:35,264 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:35,266 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 20:20:35,267 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:35,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:35,280 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-30 20:20:35,283 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:35,284 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:35,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:35,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,363 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:20:35,363 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:20:35,363 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 20:20:35,377 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:35,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:35,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:35,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:35,537 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 20:20:35,538 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 20:20:35,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 20:20:35,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 20:20:35,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:20:35,579 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-30 20:20:35,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:35,668 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-30 20:20:35,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 20:20:35,671 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-30 20:20:35,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:35,682 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:20:35,682 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 20:20:35,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:20:35,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 20:20:35,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 20:20:35,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 20:20:35,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 20:20:35,721 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-30 20:20:35,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:35,721 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 20:20:35,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 20:20:35,722 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 20:20:35,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 20:20:35,722 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:35,722 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-30 20:20:35,723 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:35,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:35,723 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-30 20:20:35,724 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:35,724 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:35,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:35,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,732 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:20:35,732 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:20:35,732 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 20:20:35,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:35,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:35,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:35,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:35,828 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:20:35,829 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3] total 3 [2018-09-30 20:20:35,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 20:20:35,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 20:20:35,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:20:35,831 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-30 20:20:35,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:35,877 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 20:20:35,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 20:20:35,878 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-30 20:20:35,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:35,879 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:20:35,879 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 20:20:35,880 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:20:35,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 20:20:35,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 20:20:35,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 20:20:35,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 20:20:35,884 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-30 20:20:35,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:35,884 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 20:20:35,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 20:20:35,884 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 20:20:35,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 20:20:35,885 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:35,885 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-30 20:20:35,886 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:35,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:35,886 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-30 20:20:35,886 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:35,886 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:35,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,888 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:35,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:35,899 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:20:35,899 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:20:35,899 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:20:35,916 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:20:36,020 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:20:36,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:36,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:36,185 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:36,209 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:20:36,210 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-09-30 20:20:36,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:20:36,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:20:36,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:20:36,211 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-30 20:20:36,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:36,361 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 20:20:36,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:20:36,362 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-30 20:20:36,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:36,363 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:20:36,363 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 20:20:36,364 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:20:36,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 20:20:36,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 20:20:36,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 20:20:36,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 20:20:36,368 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-30 20:20:36,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:36,368 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 20:20:36,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:20:36,369 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 20:20:36,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 20:20:36,369 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:36,370 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-30 20:20:36,370 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:36,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:36,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-30 20:20:36,371 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:36,371 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:36,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:36,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:36,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:36,384 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:20:36,384 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:20:36,384 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2018-09-30 20:20:36,401 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:18,326 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-30 20:22:18,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:18,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:18,503 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:18,524 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:22:18,524 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-09-30 20:22:18,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 20:22:18,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 20:22:18,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:22:18,525 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-30 20:22:18,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:18,582 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 20:22:18,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 20:22:18,583 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-30 20:22:18,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:18,584 INFO L225 Difference]: With dead ends: 15 [2018-09-30 20:22:18,584 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 20:22:18,585 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:22:18,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 20:22:18,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 20:22:18,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 20:22:18,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 20:22:18,590 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-30 20:22:18,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:18,590 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 20:22:18,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 20:22:18,591 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 20:22:18,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 20:22:18,591 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:18,592 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-30 20:22:18,592 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:18,592 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:18,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-30 20:22:18,593 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:18,593 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:18,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:18,594 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:18,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:18,606 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:22:18,607 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:22:18,607 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:18,616 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:22:19,110 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:22:19,110 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:19,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:19,449 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:19,475 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:22:19,476 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-09-30 20:22:19,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 20:22:19,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 20:22:19,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:22:19,477 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-30 20:22:19,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:19,587 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 20:22:19,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 20:22:19,590 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-30 20:22:19,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:19,591 INFO L225 Difference]: With dead ends: 17 [2018-09-30 20:22:19,591 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 20:22:19,592 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:22:19,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 20:22:19,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 20:22:19,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 20:22:19,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 20:22:19,597 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-30 20:22:19,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:19,597 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 20:22:19,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 20:22:19,598 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 20:22:19,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 20:22:19,598 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:19,598 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-30 20:22:19,599 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:19,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:19,599 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-30 20:22:19,599 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:19,599 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:19,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:19,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:19,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:19,618 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:22:19,618 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:22:19,619 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:19,627 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:22:34,431 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 20:22:34,431 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:34,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:34,782 WARN L178 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 12 [2018-09-30 20:22:34,957 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:34,978 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:22:34,978 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-09-30 20:22:34,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 20:22:34,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 20:22:34,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:22:34,979 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-30 20:22:35,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:35,151 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 20:22:35,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 20:22:35,153 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-30 20:22:35,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:35,154 INFO L225 Difference]: With dead ends: 19 [2018-09-30 20:22:35,154 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 20:22:35,154 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:22:35,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 20:22:35,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 20:22:35,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 20:22:35,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 20:22:35,162 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-30 20:22:35,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:35,162 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 20:22:35,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 20:22:35,163 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 20:22:35,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 20:22:35,163 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:35,164 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-30 20:22:35,164 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:35,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:35,164 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-30 20:22:35,164 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:35,165 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:35,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:35,166 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:35,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:35,178 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:22:35,178 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:22:35,178 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:35,187 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:22:39,351 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 20:22:39,351 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:39,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:40,226 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:40,256 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:22:40,256 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-09-30 20:22:40,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 20:22:40,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 20:22:40,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:22:40,258 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-30 20:22:40,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:40,371 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 20:22:40,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 20:22:40,373 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-30 20:22:40,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:40,374 INFO L225 Difference]: With dead ends: 21 [2018-09-30 20:22:40,374 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 20:22:40,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:22:40,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 20:22:40,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 20:22:40,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 20:22:40,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 20:22:40,380 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-30 20:22:40,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:40,381 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 20:22:40,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 20:22:40,381 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 20:22:40,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 20:22:40,381 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:40,382 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-30 20:22:40,382 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:40,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:40,382 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-30 20:22:40,382 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:40,382 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:40,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:40,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:40,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:40,396 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:22:40,397 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:22:40,397 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:40,412 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:22:41,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:41,014 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:41,319 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:41,341 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:22:41,341 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-09-30 20:22:41,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 20:22:41,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 20:22:41,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:22:41,342 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-30 20:22:41,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:41,905 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 20:22:41,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 20:22:41,905 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-30 20:22:41,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:41,906 INFO L225 Difference]: With dead ends: 23 [2018-09-30 20:22:41,906 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 20:22:41,907 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:22:41,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 20:22:41,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 20:22:41,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 20:22:41,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 20:22:41,912 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-30 20:22:41,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:41,913 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 20:22:41,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 20:22:41,913 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 20:22:41,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 20:22:41,914 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:41,914 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-30 20:22:41,914 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:41,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:41,914 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-30 20:22:41,915 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:41,915 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:41,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:41,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:22:41,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:41,930 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:22:41,930 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:22:41,930 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:22:41,945 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:23:04,460 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:23:04,460 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:23:04,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:23:04,711 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:23:04,732 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-09-30 20:23:04,733 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-09-30 20:23:04,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 20:23:04,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 20:23:04,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:23:04,734 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-30 20:23:05,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:23:05,054 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 20:23:05,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 20:23:05,056 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-30 20:23:05,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:23:05,056 INFO L225 Difference]: With dead ends: 25 [2018-09-30 20:23:05,057 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 20:23:05,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:23:05,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 20:23:05,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 20:23:05,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 20:23:05,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 20:23:05,062 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-30 20:23:05,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:23:05,063 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 20:23:05,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 20:23:05,063 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 20:23:05,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 20:23:05,064 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:23:05,064 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-30 20:23:05,064 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:23:05,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:23:05,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-30 20:23:05,065 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:23:05,065 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:23:05,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:23:05,066 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:23:05,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:23:05,080 ERROR L236 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-09-30 20:23:05,080 INFO L259 seRefinementStrategy]: Advancing trace checker [2018-09-30 20:23:05,080 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-09-30 20:23:05,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown