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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:26:02,324 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:26:02,326 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:26:02,338 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-20 13:26:02,348 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 13:26:02,349 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 13:26:02,350 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 13:26:02,351 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 13:26:02,352 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 13:26:02,353 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 13:26:02,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 13:26:02,357 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 13:26:02,359 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 13:26:02,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 13:26:02,362 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 13:26:02,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 13:26:02,365 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-20 13:26:02,369 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-20 13:26:02,369 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-20 13:26:02,370 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-20 13:26:02,371 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-20 13:26:02,372 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-20 13:26:02,372 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-20 13:26:02,373 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-20 13:26:02,373 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-20 13:26:02,373 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:26:02,374 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:26:02,375 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:26:02,376 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-20 13:26:02,390 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:26:02,391 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:26:02,391 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:26:02,391 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:26:02,392 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:26:02,392 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:26:02,392 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:26:02,393 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:26:02,393 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:26:02,393 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:26:02,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:26:02,394 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:26:02,394 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:26:02,394 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:26:02,395 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:26:02,395 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:26:02,395 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:26:02,395 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:26:02,395 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:26:02,396 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:26:02,396 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:26:02,396 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:26:02,396 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:26:02,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:26:02,397 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:26:02,397 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:26:02,397 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:26:02,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:26:02,398 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:26:02,398 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:26:02,427 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:26:02,440 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:26:02,443 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:26:02,445 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:26:02,445 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:26:02,446 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+nlh-reducer.c [2019-09-20 13:26:02,516 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3dd1b34e2/b61e2997cfdf4ca7b618918b0875d678/FLAG7b673a8a1 [2019-09-20 13:26:03,132 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:26:03,133 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+nlh-reducer.c [2019-09-20 13:26:03,147 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3dd1b34e2/b61e2997cfdf4ca7b618918b0875d678/FLAG7b673a8a1 [2019-09-20 13:26:03,379 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3dd1b34e2/b61e2997cfdf4ca7b618918b0875d678 [2019-09-20 13:26:03,387 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:26:03,389 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:26:03,390 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:26:03,390 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:26:03,394 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:26:03,395 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:26:03" (1/1) ... [2019-09-20 13:26:03,398 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e126ee9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:03, skipping insertion in model container [2019-09-20 13:26:03,399 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:26:03" (1/1) ... [2019-09-20 13:26:03,407 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:26:03,491 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:26:04,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:26:04,066 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:26:04,268 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:26:04,286 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:26:04,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04 WrapperNode [2019-09-20 13:26:04,287 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:26:04,288 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:26:04,288 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:26:04,288 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:26:04,302 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,302 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,337 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,338 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,458 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,468 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (1/1) ... [2019-09-20 13:26:04,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:26:04,484 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:26:04,484 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:26:04,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:26:04,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (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 [2019-09-20 13:26:04,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:26:04,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:26:04,565 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:26:04,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:26:04,565 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2019-09-20 13:26:04,565 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2019-09-20 13:26:04,566 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:26:04,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:26:04,566 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-09-20 13:26:04,566 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-09-20 13:26:04,566 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-09-20 13:26:04,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-09-20 13:26:04,567 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-09-20 13:26:04,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:26:04,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:26:04,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-09-20 13:26:04,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-09-20 13:26:06,452 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:26:06,453 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-09-20 13:26:06,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:06 BoogieIcfgContainer [2019-09-20 13:26:06,455 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:26:06,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:26:06,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:26:06,459 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:26:06,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:26:03" (1/3) ... [2019-09-20 13:26:06,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3968398f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:06, skipping insertion in model container [2019-09-20 13:26:06,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:04" (2/3) ... [2019-09-20 13:26:06,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3968398f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:06, skipping insertion in model container [2019-09-20 13:26:06,462 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:06" (3/3) ... [2019-09-20 13:26:06,464 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+nlh-reducer.c [2019-09-20 13:26:06,474 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:26:06,483 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:26:06,501 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:26:06,529 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:26:06,529 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:26:06,530 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:26:06,530 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:26:06,530 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:26:06,530 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:26:06,530 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:26:06,530 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:26:06,558 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states. [2019-09-20 13:26:06,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-09-20 13:26:06,585 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:06,586 INFO L407 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:06,589 INFO L418 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:06,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:06,595 INFO L82 PathProgramCache]: Analyzing trace with hash -745324545, now seen corresponding path program 1 times [2019-09-20 13:26:06,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:06,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:06,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:06,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:06,660 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:08,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:13,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:13,647 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:13,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2019-09-20 13:26:13,648 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:13,655 INFO L454 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-09-20 13:26:13,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-09-20 13:26:13,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=4400, Unknown=0, NotChecked=0, Total=4556 [2019-09-20 13:26:13,673 INFO L87 Difference]: Start difference. First operand 184 states. Second operand 68 states.