/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_label35.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:27:22,058 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:27:22,062 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:27:22,118 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:27:22,119 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:27:22,125 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:27:22,127 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:27:22,132 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:27:22,135 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:27:22,140 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:27:22,142 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:27:22,143 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:27:22,144 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:27:22,147 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:27:22,149 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:27:22,151 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:27:22,152 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:27:22,154 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:27:22,162 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:27:22,172 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:27:22,174 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:27:22,175 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:27:22,177 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:27:22,177 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:27:22,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:27:22,183 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:27:22,184 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:27:22,184 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:27:22,189 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:27:22,190 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:27:22,190 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:27:22,191 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:27:22,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:27:22,194 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:27:22,195 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:27:22,195 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:27:22,196 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:27:22,196 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:27:22,196 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:27:22,197 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:27:22,198 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:27:22,205 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 19:27:22,249 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:27:22,249 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:27:22,251 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:27:22,251 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:27:22,252 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:27:22,252 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:27:22,252 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:27:22,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:27:22,252 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:27:22,253 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:27:22,253 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:27:22,254 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:27:22,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:27:22,255 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:27:22,255 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:27:22,255 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:27:22,255 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:27:22,256 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:27:22,256 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:27:22,256 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:27:22,256 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:27:22,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:27:22,257 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:27:22,257 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:27:22,257 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:27:22,257 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:27:22,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:27:22,258 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:27:22,258 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:27:22,259 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:27:22,662 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:27:22,701 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:27:22,706 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:27:22,708 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:27:22,709 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:27:22,710 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label35.c [2020-10-27 19:27:22,797 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/33bf35a10/782c7dc9be02472dbc403b34ffd57e08/FLAGf408f86eb [2020-10-27 19:27:23,967 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:27:23,968 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label35.c [2020-10-27 19:27:24,026 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/33bf35a10/782c7dc9be02472dbc403b34ffd57e08/FLAGf408f86eb [2020-10-27 19:27:24,272 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/33bf35a10/782c7dc9be02472dbc403b34ffd57e08 [2020-10-27 19:27:24,275 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:27:24,281 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:27:24,285 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:27:24,285 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:27:24,289 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:27:24,289 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:27:24" (1/1) ... [2020-10-27 19:27:24,293 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@535e3d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:24, skipping insertion in model container [2020-10-27 19:27:24,294 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:27:24" (1/1) ... [2020-10-27 19:27:24,302 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:27:24,509 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:27:26,719 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:27:26,735 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:27:27,963 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:27:28,015 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:27:28,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28 WrapperNode [2020-10-27 19:27:28,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:27:28,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:27:28,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:27:28,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:27:28,032 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,124 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,124 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,342 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,471 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,537 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (1/1) ... [2020-10-27 19:27:28,608 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:27:28,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:27:28,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:27:28,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:27:28,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (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 19:27:28,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:27:28,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:27:28,697 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:27:28,697 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 19:27:28,698 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:27:28,699 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 19:27:28,699 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 19:27:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 19:27:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 19:27:28,700 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 19:27:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 19:27:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:27:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:27:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:27:28,701 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:27:28,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:27:28,703 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:27:28,703 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:27:28,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:27:46,329 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:27:46,330 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 19:27:46,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:27:46 BoogieIcfgContainer [2020-10-27 19:27:46,335 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:27:46,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:27:46,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:27:46,343 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:27:46,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:27:24" (1/3) ... [2020-10-27 19:27:46,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2321b3e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:27:46, skipping insertion in model container [2020-10-27 19:27:46,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:27:28" (2/3) ... [2020-10-27 19:27:46,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2321b3e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:27:46, skipping insertion in model container [2020-10-27 19:27:46,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:27:46" (3/3) ... [2020-10-27 19:27:46,347 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label35.c [2020-10-27 19:27:46,359 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:27:46,365 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:27:46,379 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:27:46,419 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:27:46,419 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:27:46,419 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:27:46,419 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:27:46,419 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:27:46,420 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:27:46,420 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:27:46,420 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:27:46,469 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 19:27:46,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-27 19:27:46,477 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:27:46,478 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] [2020-10-27 19:27:46,478 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:27:46,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:27:46,485 INFO L82 PathProgramCache]: Analyzing trace with hash -471046451, now seen corresponding path program 1 times [2020-10-27 19:27:46,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:27:46,496 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109491899] [2020-10-27 19:27:46,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:27:46,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:46,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:47,311 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:47,311 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 56 [2020-10-27 19:27:47,311 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:47,312 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 572 [2020-10-27 19:27:47,314 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:47,314 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:27:47,314 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 19:27:47,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 47 [2020-10-27 19:27:47,315 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-27 19:27:47,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:27:47,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:27:47,505 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:27:47,527 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:27:47,527 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:27:47,527 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:27:47,528 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 26 [2020-10-27 19:27:47,528 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:27:47,528 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:27:47,528 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:27:47,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:27:47,529 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:27:47,555 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 19:27:47,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109491899] [2020-10-27 19:27:47,558 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:27:47,558 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 19:27:47,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129794437] [2020-10-27 19:27:47,564 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:27:47,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:27:47,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:27:47,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:27:47,582 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 19:28:20,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:28:20,001 INFO L93 Difference]: Finished difference Result 5062 states and 9524 transitions. [2020-10-27 19:28:20,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:28:20,006 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 46 [2020-10-27 19:28:20,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:28:20,052 INFO L225 Difference]: With dead ends: 5062 [2020-10-27 19:28:20,053 INFO L226 Difference]: Without dead ends: 3201 [2020-10-27 19:28:20,067 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 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 19:28:20,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3201 states. [2020-10-27 19:28:20,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3201 to 3153. [2020-10-27 19:28:20,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3153 states. [2020-10-27 19:28:20,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3153 states to 3153 states and 5020 transitions. [2020-10-27 19:28:20,301 INFO L78 Accepts]: Start accepts. Automaton has 3153 states and 5020 transitions. Word has length 46 [2020-10-27 19:28:20,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:28:20,302 INFO L481 AbstractCegarLoop]: Abstraction has 3153 states and 5020 transitions. [2020-10-27 19:28:20,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:28:20,302 INFO L276 IsEmpty]: Start isEmpty. Operand 3153 states and 5020 transitions. [2020-10-27 19:28:20,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-10-27 19:28:20,318 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:28:20,319 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:28:20,320 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:28:20,320 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:28:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:28:20,321 INFO L82 PathProgramCache]: Analyzing trace with hash -247954374, now seen corresponding path program 1 times [2020-10-27 19:28:20,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:28:20,322 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497368667] [2020-10-27 19:28:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:28:20,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:20,437 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:20,513 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:20,824 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:21,155 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:21,863 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:21,863 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 129 [2020-10-27 19:28:21,864 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 19:28:21,865 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1455 [2020-10-27 19:28:21,868 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:21,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:28:21,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 80 [2020-10-27 19:28:21,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 45 [2020-10-27 19:28:21,869 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:28:22,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:28:22,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:22,024 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:22,030 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:22,030 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:28:22,030 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:28:22,036 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 19:28:22,036 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:22,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:28:22,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:28:22,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:28:22,038 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:28:22,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:28:22,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:28:22,102 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:22,161 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:28:22,187 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:28:22,187 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 19:28:22,187 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:28:22,188 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 100 [2020-10-27 19:28:22,188 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:28:22,188 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:28:22,188 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 64 [2020-10-27 19:28:22,188 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:28:22,189 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:28:22,256 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:28:22,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497368667] [2020-10-27 19:28:22,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:28:22,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 19:28:22,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539669412] [2020-10-27 19:28:22,259 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:28:22,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:28:22,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:28:22,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:28:22,263 INFO L87 Difference]: Start difference. First operand 3153 states and 5020 transitions. Second operand 6 states. [2020-10-27 19:29:13,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:29:13,457 INFO L93 Difference]: Finished difference Result 12146 states and 19546 transitions. [2020-10-27 19:29:13,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 19:29:13,463 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 117 [2020-10-27 19:29:13,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:29:13,522 INFO L225 Difference]: With dead ends: 12146 [2020-10-27 19:29:13,522 INFO L226 Difference]: Without dead ends: 8999 [2020-10-27 19:29:13,534 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:29:13,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8999 states. [2020-10-27 19:29:13,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8999 to 8908. [2020-10-27 19:29:13,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8908 states. [2020-10-27 19:29:13,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8908 states to 8908 states and 12690 transitions. [2020-10-27 19:29:13,855 INFO L78 Accepts]: Start accepts. Automaton has 8908 states and 12690 transitions. Word has length 117 [2020-10-27 19:29:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:29:13,857 INFO L481 AbstractCegarLoop]: Abstraction has 8908 states and 12690 transitions. [2020-10-27 19:29:13,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:29:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 8908 states and 12690 transitions. [2020-10-27 19:29:13,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-10-27 19:29:13,863 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:29:13,863 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:29:13,863 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:29:13,864 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:29:13,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:29:13,865 INFO L82 PathProgramCache]: Analyzing trace with hash 645531964, now seen corresponding path program 1 times [2020-10-27 19:29:13,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:29:13,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121478005] [2020-10-27 19:29:13,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:29:13,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:13,929 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:14,114 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:15,021 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:15,021 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 129 [2020-10-27 19:29:15,021 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:29:15,021 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1113 [2020-10-27 19:29:15,022 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:15,022 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-27 19:29:15,022 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 79 [2020-10-27 19:29:15,022 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 46 [2020-10-27 19:29:15,022 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:29:15,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:29:15,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:15,254 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:15,261 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:15,261 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:29:15,261 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:29:15,261 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 19:29:15,261 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:15,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:29:15,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:29:15,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:29:15,262 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:29:15,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:29:15,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:29:15,327 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:29:15,410 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:29:15,410 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-27 19:29:15,410 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 95 [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 65 [2020-10-27 19:29:15,411 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:29:15,478 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:29:15,478 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121478005] [2020-10-27 19:29:15,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:29:15,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-27 19:29:15,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555796963] [2020-10-27 19:29:15,480 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 19:29:15,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:29:15,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 19:29:15,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:29:15,483 INFO L87 Difference]: Start difference. First operand 8908 states and 12690 transitions. Second operand 6 states. [2020-10-27 19:30:15,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:30:15,816 INFO L93 Difference]: Finished difference Result 30498 states and 45127 transitions. [2020-10-27 19:30:15,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 19:30:15,819 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 117 [2020-10-27 19:30:15,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:30:15,913 INFO L225 Difference]: With dead ends: 30498 [2020-10-27 19:30:15,913 INFO L226 Difference]: Without dead ends: 21596 [2020-10-27 19:30:15,950 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-27 19:30:15,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21596 states. [2020-10-27 19:30:16,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21596 to 21589. [2020-10-27 19:30:16,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21589 states. [2020-10-27 19:30:16,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21589 states to 21589 states and 29644 transitions. [2020-10-27 19:30:16,560 INFO L78 Accepts]: Start accepts. Automaton has 21589 states and 29644 transitions. Word has length 117 [2020-10-27 19:30:16,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:30:16,568 INFO L481 AbstractCegarLoop]: Abstraction has 21589 states and 29644 transitions. [2020-10-27 19:30:16,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 19:30:16,568 INFO L276 IsEmpty]: Start isEmpty. Operand 21589 states and 29644 transitions. [2020-10-27 19:30:16,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-10-27 19:30:16,571 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:30:16,571 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:16,571 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:30:16,572 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:30:16,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:30:16,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1544869912, now seen corresponding path program 1 times [2020-10-27 19:30:16,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:30:16,574 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199835563] [2020-10-27 19:30:16,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:30:16,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:16,633 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:16,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:17,592 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:17,592 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 139 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 980 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 91 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-10-27 19:30:17,593 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:17,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:30:17,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:17,760 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:17,766 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:17,767 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:30:17,767 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:30:17,767 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 19:30:17,767 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:17,768 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:30:17,768 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:30:17,768 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:30:17,768 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:17,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:30:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:30:17,837 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:30:17,894 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:30:17,894 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 82 [2020-10-27 19:30:17,894 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:30:17,894 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 69 [2020-10-27 19:30:17,895 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:30:17,895 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:30:17,895 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:30:17,895 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 76 [2020-10-27 19:30:17,895 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:30:17,938 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:30:17,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199835563] [2020-10-27 19:30:17,939 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:30:17,940 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:30:17,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624747512] [2020-10-27 19:30:17,942 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:30:17,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:30:17,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:30:17,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:30:17,943 INFO L87 Difference]: Start difference. First operand 21589 states and 29644 transitions. Second operand 5 states. [2020-10-27 19:31:04,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:31:04,148 INFO L93 Difference]: Finished difference Result 50275 states and 70701 transitions. [2020-10-27 19:31:04,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:31:04,151 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 127 [2020-10-27 19:31:04,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:31:04,258 INFO L225 Difference]: With dead ends: 50275 [2020-10-27 19:31:04,258 INFO L226 Difference]: Without dead ends: 28692 [2020-10-27 19:31:04,306 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 19:31:04,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28692 states. [2020-10-27 19:31:04,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28692 to 28631. [2020-10-27 19:31:04,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28631 states. [2020-10-27 19:31:04,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28631 states to 28631 states and 38572 transitions. [2020-10-27 19:31:04,966 INFO L78 Accepts]: Start accepts. Automaton has 28631 states and 38572 transitions. Word has length 127 [2020-10-27 19:31:04,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:31:04,968 INFO L481 AbstractCegarLoop]: Abstraction has 28631 states and 38572 transitions. [2020-10-27 19:31:04,968 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:31:04,968 INFO L276 IsEmpty]: Start isEmpty. Operand 28631 states and 38572 transitions. [2020-10-27 19:31:04,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-10-27 19:31:04,971 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:31:04,972 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:31:04,972 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:31:04,972 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:31:04,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:31:04,973 INFO L82 PathProgramCache]: Analyzing trace with hash 997929922, now seen corresponding path program 1 times [2020-10-27 19:31:04,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:31:04,974 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158297260] [2020-10-27 19:31:04,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:31:05,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:31:05,081 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:31:05,181 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:31:06,257 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:31:07,201 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:31:07,205 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 159 [2020-10-27 19:31:07,206 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:31:07,206 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2172 [2020-10-27 19:31:07,206 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:31:07,206 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:31:07,206 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-27 19:31:07,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-10-27 19:31:07,207 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:31:07,401 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:31:07,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:31:07,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:31:07,409 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:31:07,414 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:31:07,414 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:31:07,414 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:31:07,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-27 19:31:07,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:31:07,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:31:07,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:31:07,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:31:07,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:31:07,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:31:07,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:31:07,498 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:31:07,588 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 105 [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:31:07,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:31:07,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-27 19:31:07,590 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:31:07,815 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 37 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:31:07,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158297260] [2020-10-27 19:31:07,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:31:07,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:31:07,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169475984] [2020-10-27 19:31:07,817 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:31:07,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:31:07,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:31:07,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:31:07,818 INFO L87 Difference]: Start difference. First operand 28631 states and 38572 transitions. Second operand 5 states.