java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem10_label53_true-unreach-call.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 13:45:36,612 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 13:45:36,614 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 13:45:36,631 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 13:45:36,633 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 13:45:36,634 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 13:45:36,635 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 13:45:36,637 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 13:45:36,640 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 13:45:36,640 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 13:45:36,643 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 13:45:36,643 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 13:45:36,644 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 13:45:36,648 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 13:45:36,656 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 13:45:36,657 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 13:45:36,658 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 13:45:36,660 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 13:45:36,668 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 13:45:36,669 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 13:45:36,673 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 13:45:36,674 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 13:45:36,679 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 13:45:36,679 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 13:45:36,680 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 13:45:36,681 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 13:45:36,682 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 13:45:36,682 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 13:45:36,683 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 13:45:36,684 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 13:45:36,685 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 13:45:36,685 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 13:45:36,686 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 13:45:36,686 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 13:45:36,687 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 13:45:36,688 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 13:45:36,688 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 13:45:36,704 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 13:45:36,704 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 13:45:36,705 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 13:45:36,705 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 13:45:36,706 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 13:45:36,706 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 13:45:36,706 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 13:45:36,706 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 13:45:36,707 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 13:45:36,707 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 13:45:36,707 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 13:45:36,707 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 13:45:36,708 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 13:45:36,708 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 13:45:36,708 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 13:45:36,709 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 13:45:36,709 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 13:45:36,709 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 13:45:36,709 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 13:45:36,709 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 13:45:36,710 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 13:45:36,710 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 13:45:36,710 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 13:45:36,710 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 13:45:36,710 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 13:45:36,711 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 13:45:36,711 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 13:45:36,711 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 13:45:36,711 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 13:45:36,712 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 13:45:36,712 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 13:45:36,712 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 13:45:36,712 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 13:45:36,712 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 13:45:36,777 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 13:45:36,792 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 13:45:36,797 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 13:45:36,798 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 13:45:36,799 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 13:45:36,800 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label53_true-unreach-call.c [2018-10-27 13:45:36,870 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49b48d1c4/769d0f3524f2480a9f3f7d275d07b90a/FLAG1c5b9d540 [2018-10-27 13:45:37,480 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 13:45:37,481 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label53_true-unreach-call.c [2018-10-27 13:45:37,494 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49b48d1c4/769d0f3524f2480a9f3f7d275d07b90a/FLAG1c5b9d540 [2018-10-27 13:45:37,509 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49b48d1c4/769d0f3524f2480a9f3f7d275d07b90a [2018-10-27 13:45:37,520 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 13:45:37,522 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 13:45:37,524 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 13:45:37,524 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 13:45:37,533 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 13:45:37,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 01:45:37" (1/1) ... [2018-10-27 13:45:37,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a4a2b07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:37, skipping insertion in model container [2018-10-27 13:45:37,537 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 01:45:37" (1/1) ... [2018-10-27 13:45:37,548 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 13:45:37,633 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 13:45:38,127 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 13:45:38,132 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 13:45:38,267 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 13:45:38,285 INFO L193 MainTranslator]: Completed translation [2018-10-27 13:45:38,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38 WrapperNode [2018-10-27 13:45:38,285 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 13:45:38,286 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 13:45:38,287 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 13:45:38,287 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 13:45:38,296 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,315 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,486 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 13:45:38,488 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 13:45:38,488 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 13:45:38,488 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 13:45:38,498 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,515 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,515 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,561 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,581 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,597 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... [2018-10-27 13:45:38,606 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 13:45:38,607 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 13:45:38,607 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 13:45:38,607 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 13:45:38,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-27 13:45:38,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 13:45:38,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 13:45:38,681 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2018-10-27 13:45:38,681 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2018-10-27 13:45:38,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 13:45:38,682 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 13:45:38,683 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 13:45:38,683 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 13:45:42,092 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 13:45:42,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 01:45:42 BoogieIcfgContainer [2018-10-27 13:45:42,093 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 13:45:42,094 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 13:45:42,096 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 13:45:42,101 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 13:45:42,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 01:45:37" (1/3) ... [2018-10-27 13:45:42,104 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73769342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 01:45:42, skipping insertion in model container [2018-10-27 13:45:42,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 01:45:38" (2/3) ... [2018-10-27 13:45:42,105 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73769342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 01:45:42, skipping insertion in model container [2018-10-27 13:45:42,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 01:45:42" (3/3) ... [2018-10-27 13:45:42,109 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem10_label53_true-unreach-call.c [2018-10-27 13:45:42,125 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 13:45:42,144 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 13:45:42,164 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 13:45:42,208 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 13:45:42,208 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 13:45:42,208 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 13:45:42,209 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 13:45:42,209 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 13:45:42,209 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 13:45:42,209 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 13:45:42,209 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 13:45:42,236 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states. [2018-10-27 13:45:42,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 13:45:42,245 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 13:45:42,247 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 13:45:42,249 INFO L424 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 13:45:42,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:45:42,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1566545735, now seen corresponding path program 1 times [2018-10-27 13:45:42,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 13:45:42,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:42,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 13:45:42,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:42,309 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 13:45:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 13:45:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 13:45:42,795 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 13:45:42,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-27 13:45:42,795 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 13:45:42,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 13:45:42,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 13:45:42,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 13:45:42,822 INFO L87 Difference]: Start difference. First operand 216 states. Second operand 4 states. [2018-10-27 13:45:46,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 13:45:46,059 INFO L93 Difference]: Finished difference Result 737 states and 1298 transitions. [2018-10-27 13:45:46,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 13:45:46,062 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 49 [2018-10-27 13:45:46,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 13:45:46,084 INFO L225 Difference]: With dead ends: 737 [2018-10-27 13:45:46,084 INFO L226 Difference]: Without dead ends: 515 [2018-10-27 13:45:46,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 13:45:46,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2018-10-27 13:45:46,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 356. [2018-10-27 13:45:46,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 356 states. [2018-10-27 13:45:46,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 579 transitions. [2018-10-27 13:45:46,180 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 579 transitions. Word has length 49 [2018-10-27 13:45:46,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 13:45:46,180 INFO L481 AbstractCegarLoop]: Abstraction has 356 states and 579 transitions. [2018-10-27 13:45:46,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 13:45:46,181 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 579 transitions. [2018-10-27 13:45:46,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-27 13:45:46,188 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 13:45:46,188 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 13:45:46,189 INFO L424 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 13:45:46,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:45:46,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1784083955, now seen corresponding path program 1 times [2018-10-27 13:45:46,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 13:45:46,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:46,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 13:45:46,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:46,191 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 13:45:46,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 13:45:46,579 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 13:45:46,580 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 13:45:46,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-27 13:45:46,580 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 13:45:46,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 13:45:46,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 13:45:46,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-10-27 13:45:46,583 INFO L87 Difference]: Start difference. First operand 356 states and 579 transitions. Second operand 6 states. [2018-10-27 13:45:49,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 13:45:49,406 INFO L93 Difference]: Finished difference Result 1259 states and 2162 transitions. [2018-10-27 13:45:49,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 13:45:49,408 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 124 [2018-10-27 13:45:49,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 13:45:49,421 INFO L225 Difference]: With dead ends: 1259 [2018-10-27 13:45:49,421 INFO L226 Difference]: Without dead ends: 909 [2018-10-27 13:45:49,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2018-10-27 13:45:49,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2018-10-27 13:45:49,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 895. [2018-10-27 13:45:49,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 895 states. [2018-10-27 13:45:49,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895 states to 895 states and 1370 transitions. [2018-10-27 13:45:49,496 INFO L78 Accepts]: Start accepts. Automaton has 895 states and 1370 transitions. Word has length 124 [2018-10-27 13:45:49,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 13:45:49,497 INFO L481 AbstractCegarLoop]: Abstraction has 895 states and 1370 transitions. [2018-10-27 13:45:49,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 13:45:49,497 INFO L276 IsEmpty]: Start isEmpty. Operand 895 states and 1370 transitions. [2018-10-27 13:45:49,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-27 13:45:49,511 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 13:45:49,511 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 13:45:49,512 INFO L424 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 13:45:49,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:45:49,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1601083443, now seen corresponding path program 1 times [2018-10-27 13:45:49,512 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 13:45:49,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:49,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 13:45:49,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:45:49,515 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 13:45:49,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 13:45:49,933 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-27 13:45:49,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 13:45:49,934 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 13:45:49,935 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 157 with the following transitions: [2018-10-27 13:45:49,937 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [9], [17], [25], [33], [41], [49], [57], [65], [73], [81], [89], [97], [105], [113], [121], [129], [137], [145], [153], [161], [169], [177], [185], [193], [201], [209], [217], [225], [233], [241], [249], [257], [265], [273], [281], [289], [293], [295], [298], [306], [314], [322], [330], [338], [346], [354], [362], [370], [378], [386], [394], [402], [410], [418], [426], [434], [442], [450], [458], [466], [474], [482], [490], [495], [499], [503], [507], [511], [515], [519], [523], [527], [531], [535], [539], [543], [547], [551], [555], [559], [563], [567], [571], [575], [579], [583], [587], [591], [595], [599], [603], [607], [611], [615], [619], [623], [627], [631], [635], [639], [642], [792], [796], [800], [806], [810], [812], [817], [818], [819], [821], [822] [2018-10-27 13:45:49,987 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 13:45:49,988 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 13:45:50,721 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-27 13:45:50,724 INFO L272 AbstractInterpreter]: Visited 111 different actions 111 times. Never merged. Never widened. Never found a fixpoint. Largest state had 24 variables. [2018-10-27 13:45:50,769 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:45:50,769 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-27 13:45:51,326 INFO L227 lantSequenceWeakener]: Weakened 140 states. On average, predicates are now at 73.91% of their original sizes. [2018-10-27 13:45:51,326 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-27 13:45:52,923 INFO L415 sIntCurrentIteration]: We unified 155 AI predicates to 155 [2018-10-27 13:45:52,923 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-27 13:45:52,924 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-27 13:45:52,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [10] imperfect sequences [4] total 12 [2018-10-27 13:45:52,925 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 13:45:52,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 13:45:52,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 13:45:52,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-10-27 13:45:52,926 INFO L87 Difference]: Start difference. First operand 895 states and 1370 transitions. Second operand 10 states. [2018-10-27 13:45:56,553 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 13:48:28,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 13:48:28,923 INFO L93 Difference]: Finished difference Result 1933 states and 2971 transitions. [2018-10-27 13:48:28,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 13:48:28,923 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 156 [2018-10-27 13:48:28,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 13:48:28,933 INFO L225 Difference]: With dead ends: 1933 [2018-10-27 13:48:28,933 INFO L226 Difference]: Without dead ends: 1044 [2018-10-27 13:48:28,937 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 159 GetRequests, 111 SyntacticMatches, 36 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-10-27 13:48:28,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1044 states. [2018-10-27 13:48:28,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1044 to 1039. [2018-10-27 13:48:28,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1039 states. [2018-10-27 13:48:28,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1521 transitions. [2018-10-27 13:48:28,980 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1521 transitions. Word has length 156 [2018-10-27 13:48:28,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 13:48:28,980 INFO L481 AbstractCegarLoop]: Abstraction has 1039 states and 1521 transitions. [2018-10-27 13:48:28,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 13:48:28,981 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1521 transitions. [2018-10-27 13:48:28,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-10-27 13:48:28,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 13:48:28,991 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 13:48:28,992 INFO L424 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 13:48:28,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:48:28,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1457972223, now seen corresponding path program 1 times [2018-10-27 13:48:28,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 13:48:28,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:48:28,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 13:48:28,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 13:48:28,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 13:48:29,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 13:48:29,387 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 4 [2018-10-27 13:48:29,612 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2018-10-27 13:48:29,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 13:48:29,613 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 13:48:29,614 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 228 with the following transitions: [2018-10-27 13:48:29,614 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [9], [17], [25], [33], [41], [49], [57], [65], [73], [81], [89], [97], [105], [113], [121], [129], [137], [145], [153], [161], [169], [177], [185], [193], [201], [209], [217], [225], [233], [241], [249], [257], [265], [273], [281], [289], [293], [295], [298], [306], [314], [322], [330], [338], [346], [354], [362], [370], [378], [386], [394], [402], [410], [418], [426], [434], [442], [450], [458], [466], [474], [482], [490], [495], [498], [499], [503], [507], [511], [515], [519], [523], [527], [531], [535], [539], [543], [547], [551], [555], [559], [563], [567], [571], [575], [579], [583], [587], [591], [595], [599], [603], [607], [611], [615], [619], [623], [627], [631], [635], [639], [642], [792], [796], [800], [806], [810], [812], [817], [818], [819], [821], [822] [2018-10-27 13:48:29,621 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 13:48:29,621 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 13:48:29,697 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 13:48:29,975 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-27 13:48:29,975 INFO L272 AbstractInterpreter]: Visited 115 different actions 332 times. Merged at 5 different actions 9 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 24 variables. [2018-10-27 13:48:29,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 13:48:29,984 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-27 13:48:30,312 INFO L227 lantSequenceWeakener]: Weakened 59 states. On average, predicates are now at 75.77% of their original sizes. [2018-10-27 13:48:30,312 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-27 13:48:31,365 INFO L415 sIntCurrentIteration]: We unified 226 AI predicates to 226 [2018-10-27 13:48:31,365 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-27 13:48:31,365 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-27 13:48:31,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [20] imperfect sequences [4] total 22 [2018-10-27 13:48:31,366 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 13:48:31,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 13:48:31,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 13:48:31,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2018-10-27 13:48:31,368 INFO L87 Difference]: Start difference. First operand 1039 states and 1521 transitions. Second operand 20 states. Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown