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 -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml --generate-csv --csv-dir csv -s ../../../trunk/examples/settings/Pdr/AutomizerBpl-pdr-smtinterpol.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-ff8eab6 [2018-09-26 09:35:19,403 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-26 09:35:19,405 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-26 09:35:19,418 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-26 09:35:19,418 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-26 09:35:19,419 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-26 09:35:19,423 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-26 09:35:19,425 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-26 09:35:19,427 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-26 09:35:19,428 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-26 09:35:19,429 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-26 09:35:19,429 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-26 09:35:19,430 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-26 09:35:19,431 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-26 09:35:19,433 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-26 09:35:19,433 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-26 09:35:19,434 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-26 09:35:19,436 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-26 09:35:19,438 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-26 09:35:19,440 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-26 09:35:19,441 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-26 09:35:19,442 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-26 09:35:19,445 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-26 09:35:19,445 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-26 09:35:19,445 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-26 09:35:19,446 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-26 09:35:19,447 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-26 09:35:19,448 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-26 09:35:19,449 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-26 09:35:19,450 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-26 09:35:19,450 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-26 09:35:19,451 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-26 09:35:19,451 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-26 09:35:19,452 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-26 09:35:19,453 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-26 09:35:19,454 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-26 09:35:19,454 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/Pdr/AutomizerBpl-pdr-smtinterpol.epf [2018-09-26 09:35:19,467 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-26 09:35:19,467 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-26 09:35:19,470 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-26 09:35:19,470 INFO L133 SettingsManager]: * SMT solver=Internal_SMTInterpol [2018-09-26 09:35:19,470 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-26 09:35:19,470 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=PDR [2018-09-26 09:35:19,471 INFO L133 SettingsManager]: * Use separate solver for trace checks=false [2018-09-26 09:35:19,471 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-26 09:35:19,538 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-26 09:35:19,550 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-26 09:35:19,554 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-26 09:35:19,556 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-26 09:35:19,556 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-26 09:35:19,557 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2018-09-26 09:35:19,557 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2018-09-26 09:35:19,614 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-26 09:35:19,618 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-26 09:35:19,619 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-26 09:35:19,619 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-26 09:35:19,619 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-26 09:35:19,640 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,657 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,665 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-26 09:35:19,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-26 09:35:19,667 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-26 09:35:19,667 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-26 09:35:19,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,681 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,682 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,686 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,688 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,689 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,691 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-26 09:35:19,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-26 09:35:19,692 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-26 09:35:19,692 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-26 09:35:19,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/1) ... [2018-09-26 09:35:19,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-26 09:35:19,790 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-26 09:35:19,995 INFO L346 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-26 09:35:19,996 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:35:19 BoogieIcfgContainer [2018-09-26 09:35:19,997 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-26 09:35:19,998 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-26 09:35:19,998 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-26 09:35:20,003 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-26 09:35:20,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:35:19" (1/2) ... [2018-09-26 09:35:20,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75137bdd and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.09 09:35:20, skipping insertion in model container [2018-09-26 09:35:20,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:35:19" (2/2) ... [2018-09-26 09:35:20,008 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2018-09-26 09:35:20,020 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:PDR Determinization: PREDICATE_ABSTRACTION [2018-09-26 09:35:20,034 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-26 09:35:20,083 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-26 09:35:20,084 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-26 09:35:20,084 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-26 09:35:20,084 INFO L383 AbstractCegarLoop]: Compute interpolants for PDR [2018-09-26 09:35:20,084 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-26 09:35:20,085 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-26 09:35:20,085 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-26 09:35:20,085 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-26 09:35:20,085 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-26 09:35:20,101 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-09-26 09:35:20,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-26 09:35:20,112 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 09:35:20,113 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-09-26 09:35:20,115 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 09:35:20,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 09:35:20,123 INFO L82 PathProgramCache]: Analyzing trace with hash 889539531, now seen corresponding path program 1 times [2018-09-26 09:35:20,130 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-09-26 09:35:20,258 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-26 09:35:20,259 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-26 09:35:20,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-26 09:35:20,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-26 09:35:20,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-26 09:35:20,276 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2018-09-26 09:35:20,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 09:35:20,330 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2018-09-26 09:35:20,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-26 09:35:20,333 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2018-09-26 09:35:20,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 09:35:20,352 INFO L225 Difference]: With dead ends: 12 [2018-09-26 09:35:20,352 INFO L226 Difference]: Without dead ends: 9 [2018-09-26 09:35:20,357 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-26 09:35:20,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-26 09:35:20,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-26 09:35:20,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-26 09:35:20,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-09-26 09:35:20,400 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-09-26 09:35:20,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 09:35:20,401 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-09-26 09:35:20,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-26 09:35:20,402 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-09-26 09:35:20,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-26 09:35:20,403 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 09:35:20,403 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-09-26 09:35:20,403 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 09:35:20,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-26 09:35:20,404 INFO L82 PathProgramCache]: Analyzing trace with hash 149049733, now seen corresponding path program 1 times [2018-09-26 09:35:20,404 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-09-26 09:35:25,131 WARN L178 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-09-26 09:35:26,239 WARN L178 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 155 [2018-09-26 09:35:27,476 WARN L178 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2018-09-26 09:35:28,908 WARN L178 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2018-09-26 09:35:30,478 WARN L178 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-09-26 09:35:32,006 WARN L178 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2018-09-26 09:35:33,967 WARN L178 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 210 [2018-09-26 09:35:36,048 WARN L178 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 221 [2018-09-26 09:35:38,353 WARN L178 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2018-09-26 09:35:40,930 WARN L178 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 243 [2018-09-26 09:35:43,774 WARN L178 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 254 [2018-09-26 09:35:46,906 WARN L178 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 265 [2018-09-26 09:35:50,456 WARN L178 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 276 [2018-09-26 09:35:54,269 WARN L178 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 287 [2018-09-26 09:35:58,868 WARN L178 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 298 [2018-09-26 09:36:04,379 WARN L178 SmtUtils]: Spent 452.00 ms on a formula simplification that was a NOOP. DAG size: 309 [2018-09-26 09:36:09,983 WARN L178 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 320 [2018-09-26 09:36:16,770 WARN L178 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 331 [2018-09-26 09:36:23,941 WARN L178 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 342 [2018-09-26 09:36:32,239 WARN L178 SmtUtils]: Spent 439.00 ms on a formula simplification that was a NOOP. DAG size: 353 [2018-09-26 09:36:41,761 WARN L178 SmtUtils]: Spent 838.00 ms on a formula simplification that was a NOOP. DAG size: 364 [2018-09-26 09:36:51,724 WARN L178 SmtUtils]: Spent 407.00 ms on a formula simplification that was a NOOP. DAG size: 375 [2018-09-26 09:37:02,775 WARN L178 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 386 [2018-09-26 09:37:15,111 WARN L178 SmtUtils]: Spent 514.00 ms on a formula simplification that was a NOOP. DAG size: 397 [2018-09-26 09:37:28,803 WARN L178 SmtUtils]: Spent 498.00 ms on a formula simplification that was a NOOP. DAG size: 408 [2018-09-26 09:37:44,031 WARN L178 SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 419 [2018-09-26 09:38:00,818 WARN L178 SmtUtils]: Spent 588.00 ms on a formula simplification that was a NOOP. DAG size: 430 [2018-09-26 09:38:19,203 WARN L178 SmtUtils]: Spent 628.00 ms on a formula simplification that was a NOOP. DAG size: 441 [2018-09-26 09:38:39,738 WARN L178 SmtUtils]: Spent 772.00 ms on a formula simplification that was a NOOP. DAG size: 452 [2018-09-26 09:39:02,662 WARN L178 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 463 [2018-09-26 09:39:27,052 WARN L178 SmtUtils]: Spent 753.00 ms on a formula simplification that was a NOOP. DAG size: 474 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown