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 0.1.23-9f4048f [2018-10-04 12:28:19,223 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-04 12:28:19,225 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-04 12:28:19,236 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-04 12:28:19,237 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-04 12:28:19,238 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-04 12:28:19,239 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-04 12:28:19,241 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-04 12:28:19,242 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-04 12:28:19,243 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-04 12:28:19,244 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-04 12:28:19,244 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-04 12:28:19,245 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-04 12:28:19,246 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-04 12:28:19,247 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-04 12:28:19,248 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-04 12:28:19,249 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-04 12:28:19,251 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-04 12:28:19,253 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-04 12:28:19,254 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-04 12:28:19,255 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-04 12:28:19,257 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-04 12:28:19,261 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-04 12:28:19,280 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 [2018-10-04 12:28:19,308 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-04 12:28:19,308 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-04 12:28:19,309 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-04 12:28:19,309 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-04 12:28:19,312 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-04 12:28:19,313 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-04 12:28:19,313 INFO L133 SettingsManager]: * Use SBE=true [2018-10-04 12:28:19,313 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-04 12:28:19,313 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-04 12:28:19,313 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-04 12:28:19,314 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-04 12:28:19,314 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-04 12:28:19,314 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-04 12:28:19,314 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-04 12:28:19,314 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-04 12:28:19,315 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-04 12:28:19,315 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-04 12:28:19,315 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-04 12:28:19,315 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-04 12:28:19,315 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-04 12:28:19,316 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-04 12:28:19,316 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-04 12:28:19,316 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 12:28:19,316 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-04 12:28:19,316 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-04 12:28:19,317 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-04 12:28:19,317 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-04 12:28:19,317 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-04 12:28:19,317 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-04 12:28:19,317 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-04 12:28:19,379 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-04 12:28:19,390 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-04 12:28:19,394 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-04 12:28:19,395 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-04 12:28:19,396 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-04 12:28:19,397 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/sum02.i_3.bpl [2018-10-04 12:28:19,397 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/sum02.i_3.bpl' [2018-10-04 12:28:19,446 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-04 12:28:19,448 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-04 12:28:19,449 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-04 12:28:19,449 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-04 12:28:19,449 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-04 12:28:19,468 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 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,480 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 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,486 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-04 12:28:19,487 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-04 12:28:19,487 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-04 12:28:19,487 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-04 12:28:19,498 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,499 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,502 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,504 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/1) ... [2018-10-04 12:28:19,506 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-04 12:28:19,507 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-04 12:28:19,507 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-04 12:28:19,507 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-04 12:28:19,508 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (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 [2018-10-04 12:28:19,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-04 12:28:19,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-04 12:28:19,827 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-04 12:28:19,828 INFO L202 PluginConnector]: Adding new model sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:28:19 BoogieIcfgContainer [2018-10-04 12:28:19,828 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-04 12:28:19,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-04 12:28:19,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-04 12:28:19,833 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-04 12:28:19,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:28:19" (1/2) ... [2018-10-04 12:28:19,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fc99c9a and model type sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.10 12:28:19, skipping insertion in model container [2018-10-04 12:28:19,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "sum02.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:28:19" (2/2) ... [2018-10-04 12:28:19,837 INFO L112 eAbstractionObserver]: Analyzing ICFG sum02.i_3.bpl [2018-10-04 12:28:19,847 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-04 12:28:19,857 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-04 12:28:19,904 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-04 12:28:19,905 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-04 12:28:19,905 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-04 12:28:19,906 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-04 12:28:19,906 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-04 12:28:19,906 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-04 12:28:19,906 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-04 12:28:19,906 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-04 12:28:19,906 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-04 12:28:19,921 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-04 12:28:19,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-04 12:28:19,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:28:19,929 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-04 12:28:19,930 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:28:19,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:28:19,936 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-04 12:28:19,938 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:28:19,939 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:28:19,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:19,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:28:19,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,017 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:28:20,018 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:28:20,018 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 [2018-10-04 12:28:20,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:28:20,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:28:20,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:28:20,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:28:20,165 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 12:28:20,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-04 12:28:20,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 12:28:20,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 12:28:20,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:28:20,197 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-04 12:28:20,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:28:20,286 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-04 12:28:20,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 12:28:20,288 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-04 12:28:20,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:28:20,298 INFO L225 Difference]: With dead ends: 11 [2018-10-04 12:28:20,298 INFO L226 Difference]: Without dead ends: 7 [2018-10-04 12:28:20,302 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 [2018-10-04 12:28:20,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-04 12:28:20,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-04 12:28:20,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-04 12:28:20,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-04 12:28:20,344 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-04 12:28:20,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:28:20,344 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-04 12:28:20,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 12:28:20,344 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-04 12:28:20,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-04 12:28:20,345 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:28:20,345 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-04 12:28:20,346 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:28:20,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:28:20,346 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-04 12:28:20,346 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:28:20,346 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:28:20,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:28:20,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,356 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:28:20,356 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:28:20,356 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 [2018-10-04 12:28:20,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:28:20,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:28:20,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:28:20,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:28:20,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:28:20,462 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3] total 3 [2018-10-04 12:28:20,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-04 12:28:20,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-04 12:28:20,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-04 12:28:20,464 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-04 12:28:20,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:28:20,537 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-04 12:28:20,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-04 12:28:20,538 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-04 12:28:20,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:28:20,539 INFO L225 Difference]: With dead ends: 11 [2018-10-04 12:28:20,539 INFO L226 Difference]: Without dead ends: 9 [2018-10-04 12:28:20,540 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 [2018-10-04 12:28:20,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-04 12:28:20,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-04 12:28:20,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-04 12:28:20,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-04 12:28:20,544 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-04 12:28:20,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:28:20,544 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-04 12:28:20,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-04 12:28:20,544 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-04 12:28:20,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-04 12:28:20,545 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:28:20,545 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-04 12:28:20,545 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:28:20,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:28:20,546 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-04 12:28:20,546 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:28:20,546 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:28:20,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,547 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:28:20,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,558 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:28:20,558 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:28:20,558 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 [2018-10-04 12:28:20,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:28:20,672 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:28:20,673 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:28:20,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:28:20,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:28:20,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:28:20,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2018-10-04 12:28:20,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-04 12:28:20,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-04 12:28:20,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-04 12:28:20,843 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-04 12:28:20,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:28:20,975 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-04 12:28:20,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-04 12:28:20,976 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-04 12:28:20,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:28:20,977 INFO L225 Difference]: With dead ends: 13 [2018-10-04 12:28:20,977 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 12:28:20,977 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 [2018-10-04 12:28:20,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 12:28:20,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-04 12:28:20,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-04 12:28:20,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-04 12:28:20,982 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-04 12:28:20,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:28:20,982 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-04 12:28:20,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-04 12:28:20,982 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-04 12:28:20,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-04 12:28:20,983 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:28:20,983 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-04 12:28:20,984 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:28:20,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:28:20,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-04 12:28:20,984 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:28:20,984 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:28:20,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,986 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:28:20,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:28:20,997 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:28:20,998 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:28:20,998 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) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2018-10-04 12:28:21,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:30:02,684 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-04 12:30:02,685 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:30:02,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:02,894 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:02,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:02,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-10-04 12:30:02,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-04 12:30:02,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-04 12:30:02,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 12:30:02,917 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-04 12:30:02,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:02,972 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-04 12:30:02,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-04 12:30:02,974 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-04 12:30:02,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:02,975 INFO L225 Difference]: With dead ends: 15 [2018-10-04 12:30:02,975 INFO L226 Difference]: Without dead ends: 13 [2018-10-04 12:30:02,976 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 [2018-10-04 12:30:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-04 12:30:02,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-04 12:30:02,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-04 12:30:02,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-04 12:30:02,984 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-04 12:30:02,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:02,984 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-04 12:30:02,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-04 12:30:02,986 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-04 12:30:02,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-04 12:30:02,986 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:02,987 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-04 12:30:02,987 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:02,987 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:02,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-04 12:30:02,988 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:02,988 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:02,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:02,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:30:02,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:03,001 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:03,001 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:03,002 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 [2018-10-04 12:30:03,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:30:03,514 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:30:03,515 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:30:03,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:03,873 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:03,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:03,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-10-04 12:30:03,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-04 12:30:03,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-04 12:30:03,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-04 12:30:03,895 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-04 12:30:03,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:03,994 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-04 12:30:03,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-04 12:30:03,995 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-04 12:30:03,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:03,995 INFO L225 Difference]: With dead ends: 17 [2018-10-04 12:30:03,995 INFO L226 Difference]: Without dead ends: 15 [2018-10-04 12:30:03,996 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 [2018-10-04 12:30:03,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-04 12:30:04,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-04 12:30:04,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-04 12:30:04,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-04 12:30:04,001 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-04 12:30:04,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:04,001 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-04 12:30:04,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-04 12:30:04,002 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-04 12:30:04,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-04 12:30:04,002 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:04,002 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-04 12:30:04,003 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:04,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:04,003 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-04 12:30:04,003 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:04,004 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:04,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:04,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:30:04,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:04,019 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:04,019 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:04,019 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 [2018-10-04 12:30:04,031 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 12:30:18,825 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-04 12:30:18,825 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:30:18,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:19,189 WARN L178 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 12 [2018-10-04 12:30:19,335 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:19,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:19,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2018-10-04 12:30:19,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-04 12:30:19,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-04 12:30:19,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 12:30:19,357 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-04 12:30:19,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:19,504 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-04 12:30:19,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-04 12:30:19,505 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-04 12:30:19,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:19,506 INFO L225 Difference]: With dead ends: 19 [2018-10-04 12:30:19,506 INFO L226 Difference]: Without dead ends: 17 [2018-10-04 12:30:19,507 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 12:30:19,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-04 12:30:19,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-04 12:30:19,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-04 12:30:19,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-04 12:30:19,511 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-04 12:30:19,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:19,512 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-04 12:30:19,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-04 12:30:19,512 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-04 12:30:19,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-04 12:30:19,513 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:19,513 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-04 12:30:19,513 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:19,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:19,513 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-04 12:30:19,514 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:19,514 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:19,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:19,515 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:30:19,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:19,530 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:19,530 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:19,530 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 [2018-10-04 12:30:19,541 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 12:30:23,712 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-04 12:30:23,712 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:30:23,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:24,619 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:24,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:24,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2018-10-04 12:30:24,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-04 12:30:24,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-04 12:30:24,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 12:30:24,651 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-04 12:30:24,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:24,740 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-04 12:30:24,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-04 12:30:24,742 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-04 12:30:24,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:24,743 INFO L225 Difference]: With dead ends: 21 [2018-10-04 12:30:24,743 INFO L226 Difference]: Without dead ends: 19 [2018-10-04 12:30:24,743 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 12:30:24,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-04 12:30:24,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-04 12:30:24,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-04 12:30:24,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-04 12:30:24,748 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-04 12:30:24,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:24,748 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-04 12:30:24,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-04 12:30:24,748 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-04 12:30:24,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-04 12:30:24,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:24,749 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-04 12:30:24,749 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:24,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:24,750 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-04 12:30:24,750 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:24,750 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:24,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:24,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:30:24,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:24,765 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:24,765 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:24,765 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 [2018-10-04 12:30:24,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:30:25,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:30:25,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:25,686 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:25,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:25,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2018-10-04 12:30:25,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 12:30:25,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 12:30:25,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:30:25,709 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-04 12:30:26,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:26,252 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-04 12:30:26,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 12:30:26,253 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-04 12:30:26,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:26,253 INFO L225 Difference]: With dead ends: 23 [2018-10-04 12:30:26,254 INFO L226 Difference]: Without dead ends: 21 [2018-10-04 12:30:26,254 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 [2018-10-04 12:30:26,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-04 12:30:26,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-04 12:30:26,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-04 12:30:26,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-04 12:30:26,259 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-04 12:30:26,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:26,260 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-04 12:30:26,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 12:30:26,260 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-04 12:30:26,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-04 12:30:26,260 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:26,261 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-04 12:30:26,261 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:26,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:26,261 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-04 12:30:26,261 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:26,261 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:26,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:26,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:30:26,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:26,275 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:26,275 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:26,276 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 [2018-10-04 12:30:26,288 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:30:48,780 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:30:48,780 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:30:48,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:30:49,055 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:30:49,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-04 12:30:49,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2018-10-04 12:30:49,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-04 12:30:49,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-04 12:30:49,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-04 12:30:49,077 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-04 12:30:49,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:30:49,395 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-04 12:30:49,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-04 12:30:49,400 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-04 12:30:49,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:30:49,401 INFO L225 Difference]: With dead ends: 25 [2018-10-04 12:30:49,401 INFO L226 Difference]: Without dead ends: 23 [2018-10-04 12:30:49,402 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 [2018-10-04 12:30:49,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-04 12:30:49,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-04 12:30:49,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-04 12:30:49,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-04 12:30:49,408 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-04 12:30:49,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:30:49,408 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-04 12:30:49,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-04 12:30:49,408 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-04 12:30:49,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-04 12:30:49,409 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:30:49,409 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-04 12:30:49,409 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:30:49,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:30:49,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-04 12:30:49,410 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:30:49,410 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:30:49,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:49,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:30:49,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:30:49,424 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2018-10-04 12:30:49,425 INFO L258 seRefinementStrategy]: Advancing trace checker [2018-10-04 12:30:49,425 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 [2018-10-04 12:30:49,436 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown