java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem18_label44.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 20:11:30,239 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 20:11:30,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 20:11:30,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 20:11:30,254 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 20:11:30,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 20:11:30,256 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 20:11:30,258 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 20:11:30,260 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 20:11:30,261 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 20:11:30,262 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 20:11:30,263 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 20:11:30,263 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 20:11:30,264 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 20:11:30,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 20:11:30,266 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 20:11:30,267 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 20:11:30,268 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 20:11:30,270 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 20:11:30,272 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 20:11:30,274 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 20:11:30,275 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 20:11:30,276 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 20:11:30,277 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 20:11:30,280 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 20:11:30,283 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 20:11:30,285 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 20:11:30,285 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 20:11:30,287 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 20:11:30,288 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 20:11:30,289 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 20:11:30,291 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 20:11:30,292 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 20:11:30,292 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 20:11:30,293 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 20:11:30,294 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 20:11:30,294 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 20:11:30,323 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 20:11:30,323 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 20:11:30,325 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 20:11:30,325 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 20:11:30,326 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 20:11:30,326 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 20:11:30,326 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 20:11:30,326 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 20:11:30,326 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 20:11:30,327 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 20:11:30,328 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 20:11:30,328 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 20:11:30,328 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 20:11:30,328 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 20:11:30,329 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 20:11:30,329 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 20:11:30,329 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 20:11:30,329 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 20:11:30,330 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 20:11:30,330 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 20:11:30,330 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 20:11:30,330 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 20:11:30,331 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 20:11:30,331 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 20:11:30,331 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 20:11:30,331 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 20:11:30,331 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 20:11:30,331 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 20:11:30,332 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-13 20:11:30,642 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 20:11:30,654 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 20:11:30,659 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 20:11:30,660 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 20:11:30,661 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 20:11:30,662 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem18_label44.c [2019-10-13 20:11:30,736 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaec52d2c/af56648839ab4ca5880e525de52aaefa/FLAG909240e76 [2019-10-13 20:11:31,495 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 20:11:31,497 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem18_label44.c [2019-10-13 20:11:31,523 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaec52d2c/af56648839ab4ca5880e525de52aaefa/FLAG909240e76 [2019-10-13 20:11:31,613 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaec52d2c/af56648839ab4ca5880e525de52aaefa [2019-10-13 20:11:31,625 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 20:11:31,626 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 20:11:31,630 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 20:11:31,630 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 20:11:31,633 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 20:11:31,634 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:31" (1/1) ... [2019-10-13 20:11:31,639 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d46bbee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:31, skipping insertion in model container [2019-10-13 20:11:31,639 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:31" (1/1) ... [2019-10-13 20:11:31,647 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 20:11:31,762 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 20:11:33,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:11:33,112 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 20:11:33,585 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:11:33,612 INFO L192 MainTranslator]: Completed translation [2019-10-13 20:11:33,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33 WrapperNode [2019-10-13 20:11:33,614 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 20:11:33,615 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 20:11:33,615 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 20:11:33,615 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 20:11:33,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,680 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,778 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,811 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,839 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (1/1) ... [2019-10-13 20:11:33,860 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 20:11:33,860 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 20:11:33,861 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 20:11:33,861 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 20:11:33,862 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (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 [2019-10-13 20:11:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 20:11:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 20:11:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-13 20:11:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-13 20:11:33,992 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-10-13 20:11:33,993 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 20:11:33,993 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-13 20:11:33,993 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-13 20:11:33,993 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-10-13 20:11:33,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 20:11:33,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 20:11:33,994 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-13 20:11:33,994 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 20:11:33,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 20:11:33,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 20:11:38,235 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 20:11:38,235 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-13 20:11:38,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:38 BoogieIcfgContainer [2019-10-13 20:11:38,237 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 20:11:38,240 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 20:11:38,240 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 20:11:38,244 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 20:11:38,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:11:31" (1/3) ... [2019-10-13 20:11:38,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f215203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:38, skipping insertion in model container [2019-10-13 20:11:38,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:33" (2/3) ... [2019-10-13 20:11:38,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f215203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:38, skipping insertion in model container [2019-10-13 20:11:38,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:38" (3/3) ... [2019-10-13 20:11:38,248 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem18_label44.c [2019-10-13 20:11:38,259 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 20:11:38,274 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 20:11:38,287 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 20:11:38,332 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 20:11:38,332 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 20:11:38,333 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 20:11:38,333 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 20:11:38,333 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 20:11:38,334 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 20:11:38,334 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 20:11:38,334 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 20:11:38,384 INFO L276 IsEmpty]: Start isEmpty. Operand 774 states. [2019-10-13 20:11:38,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-13 20:11:38,393 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:11:38,395 INFO L380 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] [2019-10-13 20:11:38,397 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:11:38,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:11:38,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1139178023, now seen corresponding path program 1 times [2019-10-13 20:11:38,413 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:11:38,414 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908886618] [2019-10-13 20:11:38,414 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:38,414 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:38,415 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:11:38,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:11:38,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:11:38,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908886618] [2019-10-13 20:11:38,821 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:11:38,821 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 20:11:38,822 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494035984] [2019-10-13 20:11:38,827 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 20:11:38,829 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:11:38,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 20:11:38,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:11:38,847 INFO L87 Difference]: Start difference. First operand 774 states. Second operand 4 states. [2019-10-13 20:11:46,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:11:46,163 INFO L93 Difference]: Finished difference Result 2970 states and 5743 transitions. [2019-10-13 20:11:46,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 20:11:46,165 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2019-10-13 20:11:46,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:11:46,201 INFO L225 Difference]: With dead ends: 2970 [2019-10-13 20:11:46,201 INFO L226 Difference]: Without dead ends: 2114 [2019-10-13 20:11:46,213 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:11:46,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2114 states. [2019-10-13 20:11:46,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2114 to 1412. [2019-10-13 20:11:46,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1412 states. [2019-10-13 20:11:46,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1412 states to 1412 states and 2246 transitions. [2019-10-13 20:11:46,356 INFO L78 Accepts]: Start accepts. Automaton has 1412 states and 2246 transitions. Word has length 38 [2019-10-13 20:11:46,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:11:46,358 INFO L462 AbstractCegarLoop]: Abstraction has 1412 states and 2246 transitions. [2019-10-13 20:11:46,358 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 20:11:46,358 INFO L276 IsEmpty]: Start isEmpty. Operand 1412 states and 2246 transitions. [2019-10-13 20:11:46,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-10-13 20:11:46,367 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:11:46,368 INFO L380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:11:46,368 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:11:46,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:11:46,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1991333515, now seen corresponding path program 1 times [2019-10-13 20:11:46,371 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:11:46,371 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739101606] [2019-10-13 20:11:46,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:46,371 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:46,372 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:11:46,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:11:46,609 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:11:46,609 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739101606] [2019-10-13 20:11:46,609 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:11:46,610 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-13 20:11:46,610 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558895547] [2019-10-13 20:11:46,612 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 20:11:46,612 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:11:46,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 20:11:46,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-13 20:11:46,613 INFO L87 Difference]: Start difference. First operand 1412 states and 2246 transitions. Second operand 5 states. [2019-10-13 20:11:52,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:11:52,713 INFO L93 Difference]: Finished difference Result 4294 states and 6875 transitions. [2019-10-13 20:11:52,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:11:52,718 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 107 [2019-10-13 20:11:52,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:11:52,740 INFO L225 Difference]: With dead ends: 4294 [2019-10-13 20:11:52,740 INFO L226 Difference]: Without dead ends: 2888 [2019-10-13 20:11:52,744 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-13 20:11:52,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2888 states. [2019-10-13 20:11:52,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2888 to 2866. [2019-10-13 20:11:52,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2866 states. [2019-10-13 20:11:52,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2866 states to 2866 states and 4300 transitions. [2019-10-13 20:11:52,825 INFO L78 Accepts]: Start accepts. Automaton has 2866 states and 4300 transitions. Word has length 107 [2019-10-13 20:11:52,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:11:52,825 INFO L462 AbstractCegarLoop]: Abstraction has 2866 states and 4300 transitions. [2019-10-13 20:11:52,825 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 20:11:52,826 INFO L276 IsEmpty]: Start isEmpty. Operand 2866 states and 4300 transitions. [2019-10-13 20:11:52,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-13 20:11:52,828 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:11:52,828 INFO L380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:11:52,828 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:11:52,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:11:52,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1573098451, now seen corresponding path program 1 times [2019-10-13 20:11:52,829 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:11:52,829 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683291201] [2019-10-13 20:11:52,830 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:52,830 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:52,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:11:52,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:11:52,952 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:11:52,953 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683291201] [2019-10-13 20:11:52,953 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:11:52,953 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:11:52,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29681264] [2019-10-13 20:11:52,954 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:11:52,955 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:11:52,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:11:52,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:11:52,955 INFO L87 Difference]: Start difference. First operand 2866 states and 4300 transitions. Second operand 6 states. [2019-10-13 20:11:58,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:11:58,684 INFO L93 Difference]: Finished difference Result 8752 states and 13417 transitions. [2019-10-13 20:11:58,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:11:58,685 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 111 [2019-10-13 20:11:58,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:11:58,731 INFO L225 Difference]: With dead ends: 8752 [2019-10-13 20:11:58,731 INFO L226 Difference]: Without dead ends: 5892 [2019-10-13 20:11:58,739 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-13 20:11:58,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5892 states. [2019-10-13 20:11:58,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5892 to 5837. [2019-10-13 20:11:58,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5837 states. [2019-10-13 20:11:58,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5837 states to 5837 states and 8644 transitions. [2019-10-13 20:11:58,948 INFO L78 Accepts]: Start accepts. Automaton has 5837 states and 8644 transitions. Word has length 111 [2019-10-13 20:11:58,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:11:58,950 INFO L462 AbstractCegarLoop]: Abstraction has 5837 states and 8644 transitions. [2019-10-13 20:11:58,950 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 20:11:58,951 INFO L276 IsEmpty]: Start isEmpty. Operand 5837 states and 8644 transitions. [2019-10-13 20:11:58,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-10-13 20:11:58,959 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:11:58,959 INFO L380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:11:58,960 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:11:58,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:11:58,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1086561052, now seen corresponding path program 1 times [2019-10-13 20:11:58,960 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:11:58,961 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144918131] [2019-10-13 20:11:58,961 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:58,961 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:11:58,961 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:11:59,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:11:59,240 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:11:59,241 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144918131] [2019-10-13 20:11:59,241 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:11:59,241 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:11:59,241 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700827927] [2019-10-13 20:11:59,242 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:11:59,242 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:11:59,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:11:59,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:11:59,243 INFO L87 Difference]: Start difference. First operand 5837 states and 8644 transitions. Second operand 6 states. [2019-10-13 20:12:04,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:12:04,438 INFO L93 Difference]: Finished difference Result 14683 states and 22171 transitions. [2019-10-13 20:12:04,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:12:04,439 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 132 [2019-10-13 20:12:04,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:12:04,481 INFO L225 Difference]: With dead ends: 14683 [2019-10-13 20:12:04,482 INFO L226 Difference]: Without dead ends: 8852 [2019-10-13 20:12:04,498 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-13 20:12:04,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8852 states. [2019-10-13 20:12:04,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8852 to 8798. [2019-10-13 20:12:04,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8798 states. [2019-10-13 20:12:04,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8798 states to 8798 states and 12610 transitions. [2019-10-13 20:12:04,714 INFO L78 Accepts]: Start accepts. Automaton has 8798 states and 12610 transitions. Word has length 132 [2019-10-13 20:12:04,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:12:04,718 INFO L462 AbstractCegarLoop]: Abstraction has 8798 states and 12610 transitions. [2019-10-13 20:12:04,718 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 20:12:04,718 INFO L276 IsEmpty]: Start isEmpty. Operand 8798 states and 12610 transitions. [2019-10-13 20:12:04,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2019-10-13 20:12:04,720 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:12:04,721 INFO L380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:12:04,721 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:12:04,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:12:04,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1901565869, now seen corresponding path program 1 times [2019-10-13 20:12:04,722 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:12:04,722 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394782912] [2019-10-13 20:12:04,723 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:12:04,723 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:12:04,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:12:04,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:12:04,906 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:12:04,907 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394782912] [2019-10-13 20:12:04,907 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:12:04,908 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:12:04,908 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159427958] [2019-10-13 20:12:04,909 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:12:04,909 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:12:04,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:12:04,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:12:04,910 INFO L87 Difference]: Start difference. First operand 8798 states and 12610 transitions. Second operand 6 states.