/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_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:22:29,512 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:22:29,519 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:22:29,591 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:22:29,592 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:22:29,601 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:22:29,603 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:22:29,609 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:22:29,613 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:22:29,620 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:22:29,623 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:22:29,625 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:22:29,625 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:22:29,630 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:22:29,633 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:22:29,636 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:22:29,638 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:22:29,643 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:22:29,652 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:22:29,661 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:22:29,663 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:22:29,665 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:22:29,668 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:22:29,670 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:22:29,680 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:22:29,680 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:22:29,681 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:22:29,683 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:22:29,701 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:22:29,702 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:22:29,703 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:22:29,704 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:22:29,706 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:22:29,707 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:22:29,708 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:22:29,708 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:22:29,709 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:22:29,709 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:22:29,709 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:22:29,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:22:29,712 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:22:29,720 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 19:22:29,775 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:22:29,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:22:29,781 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:22:29,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:22:29,782 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:22:29,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:22:29,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:22:29,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:22:29,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:22:29,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:22:29,785 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:22:29,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:22:29,786 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:22:29,786 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:22:29,786 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:22:29,786 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:22:29,787 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:22:29,787 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:22:29,787 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:22:29,787 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:22:29,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:22:29,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:22:29,788 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:22:29,788 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:22:29,788 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:22:29,789 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:22:29,789 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:22:29,789 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:22:29,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:22:29,790 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:22:30,290 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:22:30,326 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:22:30,331 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:22:30,333 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:22:30,334 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:22:30,335 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label16.c [2020-10-27 19:22:30,450 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/63452f987/d943bc393bd448a98b4471c9346fc891/FLAGa32f0ba4e [2020-10-27 19:22:31,854 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:22:31,856 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label16.c [2020-10-27 19:22:31,927 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/63452f987/d943bc393bd448a98b4471c9346fc891/FLAGa32f0ba4e [2020-10-27 19:22:32,021 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/63452f987/d943bc393bd448a98b4471c9346fc891 [2020-10-27 19:22:32,026 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:22:32,035 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:22:32,041 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:22:32,041 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:22:32,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:22:32,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:22:32" (1/1) ... [2020-10-27 19:22:32,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@305c2c7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:32, skipping insertion in model container [2020-10-27 19:22:32,053 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:22:32" (1/1) ... [2020-10-27 19:22:32,064 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:22:32,310 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:22:34,992 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:22:35,010 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:22:36,430 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:22:36,517 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:22:36,519 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36 WrapperNode [2020-10-27 19:22:36,519 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:22:36,522 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:22:36,523 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:22:36,524 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:22:36,548 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:36,551 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:36,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:36,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:36,996 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:37,199 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:37,271 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (1/1) ... [2020-10-27 19:22:37,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:22:37,410 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:22:37,411 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:22:37,411 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:22:37,413 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (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 19:22:37,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:22:37,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:22:37,603 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:22:37,603 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 19:22:37,604 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:22:37,606 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 19:22:37,606 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 19:22:37,607 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 19:22:37,607 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 19:22:37,607 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 19:22:37,608 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 19:22:37,609 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:22:37,609 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:22:37,609 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:22:37,609 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:22:37,610 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:22:37,610 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:22:37,610 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:22:37,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:22:37,611 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:22:37,611 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:22:37,611 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:22:37,611 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:22:37,611 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:22:57,426 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:22:57,426 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 19:22:57,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:22:57 BoogieIcfgContainer [2020-10-27 19:22:57,433 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:22:57,436 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:22:57,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:22:57,440 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:22:57,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:22:32" (1/3) ... [2020-10-27 19:22:57,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32585f81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:22:57, skipping insertion in model container [2020-10-27 19:22:57,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:22:36" (2/3) ... [2020-10-27 19:22:57,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32585f81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:22:57, skipping insertion in model container [2020-10-27 19:22:57,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:22:57" (3/3) ... [2020-10-27 19:22:57,444 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label16.c [2020-10-27 19:22:57,458 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:22:57,467 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:22:57,481 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:22:57,524 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:22:57,525 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:22:57,525 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:22:57,525 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:22:57,525 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:22:57,525 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:22:57,525 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:22:57,525 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:22:57,580 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 19:22:57,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-10-27 19:22:57,590 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:22:57,591 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] [2020-10-27 19:22:57,592 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:22:57,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:22:57,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1768892187, now seen corresponding path program 1 times [2020-10-27 19:22:57,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:22:57,612 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487484414] [2020-10-27 19:22:57,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:22:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:22:57,985 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:22:58,717 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:22:58,718 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 70 [2020-10-27 19:22:58,718 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:22:58,718 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 856 [2020-10-27 19:22:58,721 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:22:58,721 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:22:58,722 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 19:22:58,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 61 [2020-10-27 19:22:58,723 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-27 19:22:58,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:22:58,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:22:58,940 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:22:58,963 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:22:58,963 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:22:58,963 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:22:58,964 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 27 [2020-10-27 19:22:58,964 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:22:58,964 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:22:58,964 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:22:58,965 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:22:58,965 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:22:58,990 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 19:22:58,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487484414] [2020-10-27 19:22:58,993 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:22:58,993 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 19:22:58,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220354949] [2020-10-27 19:22:59,000 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:22:59,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:22:59,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:22:59,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:22:59,021 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 19:23:30,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:23:30,725 INFO L93 Difference]: Finished difference Result 5100 states and 9572 transitions. [2020-10-27 19:23:30,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:23:30,729 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 60 [2020-10-27 19:23:30,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:23:30,785 INFO L225 Difference]: With dead ends: 5100 [2020-10-27 19:23:30,785 INFO L226 Difference]: Without dead ends: 3255 [2020-10-27 19:23:30,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 2 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 19:23:30,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2020-10-27 19:23:31,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 3209. [2020-10-27 19:23:31,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3209 states. [2020-10-27 19:23:31,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3209 states to 3209 states and 5178 transitions. [2020-10-27 19:23:31,076 INFO L78 Accepts]: Start accepts. Automaton has 3209 states and 5178 transitions. Word has length 60 [2020-10-27 19:23:31,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:23:31,081 INFO L481 AbstractCegarLoop]: Abstraction has 3209 states and 5178 transitions. [2020-10-27 19:23:31,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:23:31,081 INFO L276 IsEmpty]: Start isEmpty. Operand 3209 states and 5178 transitions. [2020-10-27 19:23:31,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-10-27 19:23:31,101 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:23:31,103 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:23:31,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:23:31,104 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:23:31,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:23:31,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1135987204, now seen corresponding path program 1 times [2020-10-27 19:23:31,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:23:31,106 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989752861] [2020-10-27 19:23:31,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:23:31,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:23:31,241 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:23:31,611 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:23:32,359 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:23:32,920 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:23:32,920 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 147 [2020-10-27 19:23:32,920 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:23:32,921 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1716 [2020-10-27 19:23:32,923 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:23:32,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:23:32,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 85 [2020-10-27 19:23:32,927 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 58 [2020-10-27 19:23:32,927 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-27 19:23:33,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:23:33,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:23:33,102 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:23:33,109 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:23:33,110 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:23:33,110 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:23:33,110 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-27 19:23:33,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:23:33,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:23:33,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:23:33,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:23:33,119 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:23:33,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:23:33,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:23:33,194 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:23:33,271 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:23:33,271 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-27 19:23:33,271 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 90 [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-27 19:23:33,272 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:23:33,383 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:23:33,384 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989752861] [2020-10-27 19:23:33,384 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:23:33,384 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 19:23:33,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109863613] [2020-10-27 19:23:33,386 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:23:33,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:23:33,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:23:33,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:23:33,388 INFO L87 Difference]: Start difference. First operand 3209 states and 5178 transitions. Second operand 6 states. [2020-10-27 19:24:29,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:24:29,307 INFO L93 Difference]: Finished difference Result 9388 states and 16137 transitions. [2020-10-27 19:24:29,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 19:24:29,316 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 135 [2020-10-27 19:24:29,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:24:29,367 INFO L225 Difference]: With dead ends: 9388 [2020-10-27 19:24:29,368 INFO L226 Difference]: Without dead ends: 6185 [2020-10-27 19:24:29,379 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:24:29,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6185 states. [2020-10-27 19:24:29,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6185 to 6085. [2020-10-27 19:24:29,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6085 states. [2020-10-27 19:24:29,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6085 states to 6085 states and 9821 transitions. [2020-10-27 19:24:29,627 INFO L78 Accepts]: Start accepts. Automaton has 6085 states and 9821 transitions. Word has length 135 [2020-10-27 19:24:29,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:24:29,631 INFO L481 AbstractCegarLoop]: Abstraction has 6085 states and 9821 transitions. [2020-10-27 19:24:29,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:24:29,632 INFO L276 IsEmpty]: Start isEmpty. Operand 6085 states and 9821 transitions. [2020-10-27 19:24:29,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-10-27 19:24:29,639 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:24:29,641 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:24:29,641 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:24:29,641 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:24:29,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:24:29,644 INFO L82 PathProgramCache]: Analyzing trace with hash -872358854, now seen corresponding path program 1 times [2020-10-27 19:24:29,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:24:29,645 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984205848] [2020-10-27 19:24:29,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:24:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:29,746 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:29,904 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:31,136 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:32,095 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:32,095 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 173 [2020-10-27 19:24:32,095 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:24:32,095 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2385 [2020-10-27 19:24:32,096 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:32,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:24:32,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-27 19:24:32,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-27 19:24:32,097 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:24:32,424 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:24:32,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:24:32,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:32,433 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:32,441 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:32,442 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:24:32,442 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:32,442 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 19:24:32,442 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:32,443 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:24:32,443 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:24:32,443 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:24:32,443 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:24:32,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:24:32,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:32,545 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:32,703 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:32,704 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 19:24:32,704 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:32,704 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 184 [2020-10-27 19:24:32,704 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:32,704 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:24:32,705 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:24:32,705 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-27 19:24:32,705 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:24:32,821 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:24:32,822 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984205848] [2020-10-27 19:24:32,822 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:24:32,823 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:24:32,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721910580] [2020-10-27 19:24:32,826 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:24:32,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:24:32,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:24:32,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:24:32,830 INFO L87 Difference]: Start difference. First operand 6085 states and 9821 transitions. Second operand 5 states. [2020-10-27 19:24:34,163 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-10-27 19:25:14,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:25:14,088 INFO L93 Difference]: Finished difference Result 12186 states and 19674 transitions. [2020-10-27 19:25:14,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:25:14,092 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 161 [2020-10-27 19:25:14,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:25:14,125 INFO L225 Difference]: With dead ends: 12186 [2020-10-27 19:25:14,125 INFO L226 Difference]: Without dead ends: 6089 [2020-10-27 19:25:14,142 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:25:14,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6089 states. [2020-10-27 19:25:14,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6089 to 6085. [2020-10-27 19:25:14,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6085 states. [2020-10-27 19:25:14,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6085 states to 6085 states and 9818 transitions. [2020-10-27 19:25:14,341 INFO L78 Accepts]: Start accepts. Automaton has 6085 states and 9818 transitions. Word has length 161 [2020-10-27 19:25:14,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:25:14,347 INFO L481 AbstractCegarLoop]: Abstraction has 6085 states and 9818 transitions. [2020-10-27 19:25:14,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:25:14,347 INFO L276 IsEmpty]: Start isEmpty. Operand 6085 states and 9818 transitions. [2020-10-27 19:25:14,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-10-27 19:25:14,351 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:25:14,352 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:25:14,352 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:25:14,352 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:25:14,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:25:14,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1513312682, now seen corresponding path program 1 times [2020-10-27 19:25:14,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:25:14,356 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661244737] [2020-10-27 19:25:14,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:25:14,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:14,427 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:14,522 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:15,436 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:16,352 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:16,353 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 181 [2020-10-27 19:25:16,353 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:25:16,353 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1950 [2020-10-27 19:25:16,353 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:16,353 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:25:16,354 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 119 [2020-10-27 19:25:16,354 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-27 19:25:16,354 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:25:16,596 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:25:16,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:25:16,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:16,604 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:16,612 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:16,613 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:25:16,613 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:25:16,613 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 19:25:16,613 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:16,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:25:16,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:25:16,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:25:16,614 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:25:16,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:25:16,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:16,708 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:16,823 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:16,823 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 110 [2020-10-27 19:25:16,824 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:25:16,824 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 137 [2020-10-27 19:25:16,824 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:16,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:25:16,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:25:16,825 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 104 [2020-10-27 19:25:16,825 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:25:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:25:16,950 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661244737] [2020-10-27 19:25:16,951 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:25:16,951 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:25:16,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110543085] [2020-10-27 19:25:16,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:25:16,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:25:16,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:25:16,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:25:16,955 INFO L87 Difference]: Start difference. First operand 6085 states and 9818 transitions. Second operand 5 states. [2020-10-27 19:25:18,496 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-10-27 19:25:57,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:25:57,558 INFO L93 Difference]: Finished difference Result 12186 states and 19668 transitions. [2020-10-27 19:25:57,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:25:57,562 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 169 [2020-10-27 19:25:57,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:25:57,595 INFO L225 Difference]: With dead ends: 12186 [2020-10-27 19:25:57,596 INFO L226 Difference]: Without dead ends: 6089 [2020-10-27 19:25:57,612 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:25:57,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6089 states. [2020-10-27 19:25:57,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6089 to 6085. [2020-10-27 19:25:57,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6085 states. [2020-10-27 19:25:57,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6085 states to 6085 states and 9815 transitions. [2020-10-27 19:25:57,802 INFO L78 Accepts]: Start accepts. Automaton has 6085 states and 9815 transitions. Word has length 169 [2020-10-27 19:25:57,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:25:57,802 INFO L481 AbstractCegarLoop]: Abstraction has 6085 states and 9815 transitions. [2020-10-27 19:25:57,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:25:57,803 INFO L276 IsEmpty]: Start isEmpty. Operand 6085 states and 9815 transitions. [2020-10-27 19:25:57,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2020-10-27 19:25:57,807 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:25:57,807 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:25:57,807 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:25:57,807 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:25:57,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:25:57,808 INFO L82 PathProgramCache]: Analyzing trace with hash 59549597, now seen corresponding path program 1 times [2020-10-27 19:25:57,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:25:57,809 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1621596373] [2020-10-27 19:25:57,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:25:57,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:57,900 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:58,009 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:58,292 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:01,839 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:01,840 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 192 [2020-10-27 19:26:01,840 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:26:01,840 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3974 [2020-10-27 19:26:01,840 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:01,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:26:01,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 130 [2020-10-27 19:26:01,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 58 [2020-10-27 19:26:01,841 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:26:02,077 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:26:02,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:26:02,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:02,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:02,095 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:02,095 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:26:02,095 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:02,096 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 19:26:02,096 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:02,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:26:02,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:02,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:26:02,097 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:02,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:26:02,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:02,200 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:02,300 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 121 [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 117 [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:26:02,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:02,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 115 [2020-10-27 19:26:02,302 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:02,410 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 51 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:26:02,411 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1621596373] [2020-10-27 19:26:02,411 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:26:02,411 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 19:26:02,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427033490] [2020-10-27 19:26:02,412 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:26:02,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:26:02,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:26:02,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:26:02,414 INFO L87 Difference]: Start difference. First operand 6085 states and 9815 transitions. Second operand 6 states. [2020-10-27 19:26:02,591 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-10-27 19:26:03,485 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 67