/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/eca-rers2012/Problem19_label52.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:32:48,272 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:32:48,275 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:32:48,315 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:32:48,316 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:32:48,318 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:32:48,319 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:32:48,322 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:32:48,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:32:48,325 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:32:48,327 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:32:48,328 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:32:48,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:32:48,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:32:48,331 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:32:48,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:32:48,334 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:32:48,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:32:48,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:32:48,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:32:48,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:32:48,343 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:32:48,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:32:48,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:32:48,350 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:32:48,350 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:32:48,350 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:32:48,352 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:32:48,352 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:32:48,353 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:32:48,354 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:32:48,355 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:32:48,356 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:32:48,357 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:32:48,358 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:32:48,359 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:32:48,360 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:32:48,360 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:32:48,360 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:32:48,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:32:48,367 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:32:48,369 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-27 19:32:48,431 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:32:48,432 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:32:48,435 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:32:48,437 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:32:48,437 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:32:48,437 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:32:48,438 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:32:48,438 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:32:48,438 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:32:48,438 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:32:48,439 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:32:48,439 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:32:48,440 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:32:48,441 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:32:48,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:32:48,441 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:32:48,441 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:32:48,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:32:48,442 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:32:48,442 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:32:48,442 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:32:48,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:32:48,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:32:48,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:32:48,444 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:32:48,444 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:32:48,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:32:48,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:32:48,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:32:48,445 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:32:48,928 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:32:48,959 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:32:48,962 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:32:48,964 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:32:48,965 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:32:48,966 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label52.c [2020-10-27 19:32:49,073 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9bda68d53/ad94816441854fcc8e14320701fbdf40/FLAG701e76e51 [2020-10-27 19:32:50,484 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:32:50,486 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label52.c [2020-10-27 19:32:50,581 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9bda68d53/ad94816441854fcc8e14320701fbdf40/FLAG701e76e51 [2020-10-27 19:32:51,072 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9bda68d53/ad94816441854fcc8e14320701fbdf40 [2020-10-27 19:32:51,076 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:32:51,086 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:32:51,090 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:32:51,091 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:32:51,095 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:32:51,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:32:51" (1/1) ... [2020-10-27 19:32:51,101 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@db729b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:51, skipping insertion in model container [2020-10-27 19:32:51,101 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:32:51" (1/1) ... [2020-10-27 19:32:51,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:32:51,364 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:32:53,547 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:32:53,566 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:32:54,756 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:32:54,814 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:32:54,815 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54 WrapperNode [2020-10-27 19:32:54,816 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:32:54,817 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:32:54,817 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:32:54,817 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:32:54,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:54,835 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:54,976 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:54,976 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:55,157 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:55,342 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:55,394 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... [2020-10-27 19:32:55,511 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:32:55,513 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:32:55,513 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:32:55,514 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:32:55,515 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-10-27 19:32:55,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:32:55,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:32:55,667 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:32:55,667 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 19:32:55,668 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 19:32:55,668 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 19:32:55,668 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 19:32:55,668 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 19:32:55,675 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 19:32:55,675 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:32:55,677 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 19:32:55,678 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 19:32:55,679 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 19:32:55,679 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 19:32:55,679 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 19:32:55,680 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 19:32:55,680 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:32:55,680 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:32:55,681 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:32:55,681 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:32:55,685 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:32:55,685 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:32:55,686 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:32:55,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:32:55,687 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:32:55,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:32:55,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:32:55,692 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:32:55,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:33:12,262 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:33:12,263 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 19:33:12,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:33:12 BoogieIcfgContainer [2020-10-27 19:33:12,269 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:33:12,271 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:33:12,271 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:33:12,275 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:33:12,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:32:51" (1/3) ... [2020-10-27 19:33:12,276 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57847602 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:33:12, skipping insertion in model container [2020-10-27 19:33:12,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:32:54" (2/3) ... [2020-10-27 19:33:12,276 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57847602 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:33:12, skipping insertion in model container [2020-10-27 19:33:12,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:33:12" (3/3) ... [2020-10-27 19:33:12,280 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label52.c [2020-10-27 19:33:12,293 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:33:12,299 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:33:12,311 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:33:12,371 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:33:12,371 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:33:12,371 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:33:12,371 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:33:12,372 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:33:12,372 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:33:12,372 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:33:12,372 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:33:12,440 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 19:33:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-10-27 19:33:12,455 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:33:12,456 INFO L422 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] [2020-10-27 19:33:12,456 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:33:12,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:33:12,467 INFO L82 PathProgramCache]: Analyzing trace with hash 875298829, now seen corresponding path program 1 times [2020-10-27 19:33:12,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:33:12,478 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710387888] [2020-10-27 19:33:12,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:33:12,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:33:12,932 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:13,564 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:33:13,565 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 19:33:13,565 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:33:13,565 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 742 [2020-10-27 19:33:13,567 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:33:13,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:33:13,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 19:33:13,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 63 [2020-10-27 19:33:13,569 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-27 19:33:13,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:33:13,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:33:13,770 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:13,810 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:33:13,810 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:33:13,810 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:33:13,810 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 44 [2020-10-27 19:33:13,811 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:33:13,811 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:33:13,811 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:33:13,811 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:33:13,811 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:33:13,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:33:13,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710387888] [2020-10-27 19:33:13,851 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:33:13,852 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 19:33:13,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842661030] [2020-10-27 19:33:13,860 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:33:13,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:33:13,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:33:13,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:33:13,887 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 19:33:44,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:33:44,595 INFO L93 Difference]: Finished difference Result 5100 states and 9572 transitions. [2020-10-27 19:33:44,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:33:44,601 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 62 [2020-10-27 19:33:44,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:33:44,656 INFO L225 Difference]: With dead ends: 5100 [2020-10-27 19:33:44,657 INFO L226 Difference]: Without dead ends: 3255 [2020-10-27 19:33:44,674 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:33:44,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2020-10-27 19:33:44,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 3209. [2020-10-27 19:33:44,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3209 states. [2020-10-27 19:33:44,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3209 states to 3209 states and 5178 transitions. [2020-10-27 19:33:44,897 INFO L78 Accepts]: Start accepts. Automaton has 3209 states and 5178 transitions. Word has length 62 [2020-10-27 19:33:44,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:33:44,898 INFO L481 AbstractCegarLoop]: Abstraction has 3209 states and 5178 transitions. [2020-10-27 19:33:44,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:33:44,898 INFO L276 IsEmpty]: Start isEmpty. Operand 3209 states and 5178 transitions. [2020-10-27 19:33:44,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-10-27 19:33:44,905 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:33:44,905 INFO L422 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, 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] [2020-10-27 19:33:44,906 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:33:44,906 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:33:44,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:33:44,907 INFO L82 PathProgramCache]: Analyzing trace with hash -337237180, now seen corresponding path program 1 times [2020-10-27 19:33:44,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:33:44,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679607030] [2020-10-27 19:33:44,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:33:44,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:33:44,985 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:45,421 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:46,457 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:46,587 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:33:46,588 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 149 [2020-10-27 19:33:46,588 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:33:46,588 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1631 [2020-10-27 19:33:46,589 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:33:46,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:33:46,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 85 [2020-10-27 19:33:46,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 60 [2020-10-27 19:33:46,590 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:33:46,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:33:46,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:33:46,735 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:46,744 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:33:46,744 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:33:46,744 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:33:46,745 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-27 19:33:46,745 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:33:46,745 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:33:46,745 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:33:46,746 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:33:46,746 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:33:46,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:33:46,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:33:46,807 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:33:46,904 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:33:46,905 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-27 19:33:46,905 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:33:46,905 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 110 [2020-10-27 19:33:46,906 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:33:46,906 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:33:46,906 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:33:46,906 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-27 19:33:46,907 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:33:47,007 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 53 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:33:47,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679607030] [2020-10-27 19:33:47,008 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:33:47,008 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:33:47,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326546903] [2020-10-27 19:33:47,010 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:33:47,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:33:47,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:33:47,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:33:47,012 INFO L87 Difference]: Start difference. First operand 3209 states and 5178 transitions. Second operand 5 states. [2020-10-27 19:34:24,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:34:24,090 INFO L93 Difference]: Finished difference Result 9270 states and 15110 transitions. [2020-10-27 19:34:24,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:34:24,093 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 137 [2020-10-27 19:34:24,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:34:24,132 INFO L225 Difference]: With dead ends: 9270 [2020-10-27 19:34:24,133 INFO L226 Difference]: Without dead ends: 6067 [2020-10-27 19:34:24,143 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:34:24,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6067 states. [2020-10-27 19:34:24,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6067 to 6058. [2020-10-27 19:34:24,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6058 states. [2020-10-27 19:34:24,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6058 states to 6058 states and 8432 transitions. [2020-10-27 19:34:24,341 INFO L78 Accepts]: Start accepts. Automaton has 6058 states and 8432 transitions. Word has length 137 [2020-10-27 19:34:24,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:34:24,345 INFO L481 AbstractCegarLoop]: Abstraction has 6058 states and 8432 transitions. [2020-10-27 19:34:24,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:34:24,345 INFO L276 IsEmpty]: Start isEmpty. Operand 6058 states and 8432 transitions. [2020-10-27 19:34:24,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-10-27 19:34:24,361 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:34:24,361 INFO L422 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, 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] [2020-10-27 19:34:24,361 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:34:24,362 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:34:24,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:34:24,365 INFO L82 PathProgramCache]: Analyzing trace with hash -703129109, now seen corresponding path program 1 times [2020-10-27 19:34:24,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:34:24,366 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210285828] [2020-10-27 19:34:24,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:34:24,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:34:24,470 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:34:24,741 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:34:25,566 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:34:25,567 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 150 [2020-10-27 19:34:25,568 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:34:25,568 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1124 [2020-10-27 19:34:25,568 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:34:25,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:34:25,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 86 [2020-10-27 19:34:25,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 60 [2020-10-27 19:34:25,569 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:34:25,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:34:25,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:34:25,760 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:34:25,770 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:34:25,770 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:34:25,770 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:34:25,770 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-27 19:34:25,771 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:34:25,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:34:25,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:34:25,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:34:25,771 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:34:25,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:34:25,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:34:25,845 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:34:25,917 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:34:25,917 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-27 19:34:25,917 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:34:25,917 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 85 [2020-10-27 19:34:25,918 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:34:25,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:34:25,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:34:25,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 71 [2020-10-27 19:34:25,918 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:34:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 53 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:34:25,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210285828] [2020-10-27 19:34:25,974 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:34:25,974 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:34:25,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121148251] [2020-10-27 19:34:25,977 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:34:25,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:34:25,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:34:25,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:34:25,978 INFO L87 Difference]: Start difference. First operand 6058 states and 8432 transitions. Second operand 5 states. [2020-10-27 19:35:09,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:35:09,449 INFO L93 Difference]: Finished difference Result 15008 states and 21511 transitions. [2020-10-27 19:35:09,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:35:09,452 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 138 [2020-10-27 19:35:09,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:35:09,502 INFO L225 Difference]: With dead ends: 15008 [2020-10-27 19:35:09,503 INFO L226 Difference]: Without dead ends: 8956 [2020-10-27 19:35:09,519 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:35:09,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8956 states. [2020-10-27 19:35:09,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8956 to 8906. [2020-10-27 19:35:09,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8906 states. [2020-10-27 19:35:09,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8906 states to 8906 states and 11985 transitions. [2020-10-27 19:35:09,791 INFO L78 Accepts]: Start accepts. Automaton has 8906 states and 11985 transitions. Word has length 138 [2020-10-27 19:35:09,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:35:09,794 INFO L481 AbstractCegarLoop]: Abstraction has 8906 states and 11985 transitions. [2020-10-27 19:35:09,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:35:09,796 INFO L276 IsEmpty]: Start isEmpty. Operand 8906 states and 11985 transitions. [2020-10-27 19:35:09,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-10-27 19:35:09,804 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:35:09,805 INFO L422 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, 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] [2020-10-27 19:35:09,805 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:35:09,805 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:35:09,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:35:09,806 INFO L82 PathProgramCache]: Analyzing trace with hash -1663590905, now seen corresponding path program 1 times [2020-10-27 19:35:09,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:35:09,806 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659201820] [2020-10-27 19:35:09,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:35:09,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:35:09,880 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:09,986 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:10,553 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:11,372 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:11,484 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:11,955 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:35:11,955 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 161 [2020-10-27 19:35:11,955 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-27 19:35:11,955 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2096 [2020-10-27 19:35:11,956 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:35:11,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:35:11,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 96 [2020-10-27 19:35:11,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 61 [2020-10-27 19:35:11,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:35:12,130 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:35:12,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:35:12,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:35:12,139 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:12,149 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:35:12,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:35:12,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:35:12,150 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-27 19:35:12,150 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:35:12,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:35:12,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:35:12,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:35:12,152 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:35:12,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:35:12,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:35:12,231 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:35:12,304 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:35:12,305 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 88 [2020-10-27 19:35:12,305 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:35:12,307 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 89 [2020-10-27 19:35:12,308 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:35:12,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:35:12,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:35:12,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 81 [2020-10-27 19:35:12,309 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:35:12,374 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 53 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:35:12,375 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659201820] [2020-10-27 19:35:12,375 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:35:12,380 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:35:12,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167243130] [2020-10-27 19:35:12,381 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:35:12,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:35:12,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:35:12,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:35:12,383 INFO L87 Difference]: Start difference. First operand 8906 states and 11985 transitions. Second operand 5 states. [2020-10-27 19:36:08,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:36:08,838 INFO L93 Difference]: Finished difference Result 22038 states and 30855 transitions. [2020-10-27 19:36:08,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:36:08,842 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 149 [2020-10-27 19:36:08,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:36:08,925 INFO L225 Difference]: With dead ends: 22038 [2020-10-27 19:36:08,925 INFO L226 Difference]: Without dead ends: 13138 [2020-10-27 19:36:08,950 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:36:08,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13138 states. [2020-10-27 19:36:09,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13138 to 13131. [2020-10-27 19:36:09,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13131 states. [2020-10-27 19:36:09,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13131 states to 13131 states and 16874 transitions. [2020-10-27 19:36:09,310 INFO L78 Accepts]: Start accepts. Automaton has 13131 states and 16874 transitions. Word has length 149 [2020-10-27 19:36:09,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:36:09,311 INFO L481 AbstractCegarLoop]: Abstraction has 13131 states and 16874 transitions. [2020-10-27 19:36:09,311 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:36:09,311 INFO L276 IsEmpty]: Start isEmpty. Operand 13131 states and 16874 transitions. [2020-10-27 19:36:09,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-10-27 19:36:09,314 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:36:09,315 INFO L422 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, 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] [2020-10-27 19:36:09,315 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:36:09,315 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:36:09,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:36:09,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1555309058, now seen corresponding path program 1 times [2020-10-27 19:36:09,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:36:09,316 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166436658] [2020-10-27 19:36:09,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:36:09,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:36:09,386 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:36:09,483 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:36:09,583 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:36:12,727 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:36:12,727 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 175 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3368 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-27 19:36:12,728 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:36:13,044 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:36:13,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:36:13,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:36:13,050 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:36:13,056 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:36:13,056 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:36:13,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:36:13,058 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:36:13,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:36:13,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:36:13,162 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:36:13,296 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:36:13,297 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 19:36:13,297 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:36:13,297 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 158 [2020-10-27 19:36:13,297 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:36:13,297 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:36:13,298 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:36:13,298 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-27 19:36:13,298 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:36:13,419 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 53 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:36:13,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166436658] [2020-10-27 19:36:13,424 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:36:13,424 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:36:13,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419738451] [2020-10-27 19:36:13,425 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:36:13,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:36:13,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:36:13,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:36:13,426 INFO L87 Difference]: Start difference. First operand 13131 states and 16874 transitions. Second operand 5 states. [2020-10-27 19:36:14,828 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 80